mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-07-15 00:17:25 +02:00
Add 0x0d_timer_cbm: bare-metal TIMER0 repeating alarm driver for RP2350
This commit is contained in:
Kevin Thomas
@@ -0,0 +1,35 @@
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/**
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******************************************************************************
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* @file image_def.c
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* @author Kevin Thomas
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* @brief RP2350 IMAGE_DEF block for boot ROM image recognition.
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*
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* Must appear within the first 4 KB of flash for the boot ROM
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* to accept the image.
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*
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2026 Kevin Thomas.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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*/
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#include <stdint.h>
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/**
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* @brief IMAGE_DEF block structure placed in flash
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*/
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__attribute__((section(".embedded_block"), used))
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const uint8_t picobin_block[] = {
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0xD3, 0xDE, 0xFF, 0xFF,
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0x42, 0x01, 0x21, 0x10,
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0xFF, 0x01, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x79, 0x35, 0x12, 0xAB
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};
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@@ -0,0 +1,51 @@
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/**
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******************************************************************************
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* @file main.c
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* @author Kevin Thomas
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* @brief Repeating timer alarm demonstration.
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*
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* Configures TIMER0 alarm 0 to fire a callback every 1 second.
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* The callback prints "Timer heartbeat" over UART. The main
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* loop idles with WFI.
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*
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* Wiring:
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* GPIO0 -> UART TX (USB-to-UART adapter RX)
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* GPIO1 -> UART RX (USB-to-UART adapter TX)
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* No external components required
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*
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2026 Kevin Thomas.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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*/
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#include "rp2350_timer.h"
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#include "rp2350_uart.h"
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/**
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* @brief Heartbeat callback invoked by TIMER0 alarm 0 IRQ.
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* @retval None
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*/
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static void _heartbeat(void)
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{
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uart_puts("Timer heartbeat\r\n");
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}
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/**
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* @brief Application entry point for the repeating timer demo.
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* @retval int does not return
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*/
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int main(void)
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{
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uart_puts("Timer alarm demo initialized\r\n");
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timer_alarm_start(1000, _heartbeat);
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while (1)
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__asm__ volatile ("wfi");
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}
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@@ -0,0 +1,34 @@
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/**
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******************************************************************************
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* @file rp2350_coprocessor.c
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* @author Kevin Thomas
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* @brief Coprocessor access control driver implementation for RP2350.
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*
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* Grants access to coprocessors 0 and 1 by setting the
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* corresponding bits in CPACR with DSB/ISB barriers.
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*
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2026 Kevin Thomas.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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*/
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#include "rp2350_coprocessor.h"
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void coprocessor_enable(void)
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{
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uint32_t value;
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value = *CPACR;
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value |= (1U << CPACR_CP1_SHIFT);
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value |= (1U << CPACR_CP0_SHIFT);
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*CPACR = value;
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__asm__ volatile ("dsb");
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__asm__ volatile ("isb");
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}
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@@ -0,0 +1,55 @@
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/**
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******************************************************************************
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* @file rp2350_delay.c
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* @author Kevin Thomas
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* @brief Delay driver implementation for RP2350.
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*
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* Busy-wait millisecond and microsecond delays calibrated for
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* a 12 MHz clock.
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*
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2026 Kevin Thomas.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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*/
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#include "rp2350_delay.h"
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void delay_ms(uint32_t ms)
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{
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if (ms == 0)
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return;
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__asm__ volatile (
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"mov r4, #3600\n\t"
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"mul r5, %0, r4\n\t"
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"1:\n\t"
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"subs r5, #1\n\t"
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"bne 1b\n\t"
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:
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: "r" (ms)
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: "r4", "r5", "cc"
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);
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}
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void delay_us(uint32_t us)
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{
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if (us == 0)
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return;
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__asm__ volatile (
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"mov r4, #4\n\t"
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"mul r5, %0, r4\n\t"
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"1:\n\t"
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"subs r5, #1\n\t"
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"bne 1b\n\t"
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:
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: "r" (us)
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: "r4", "r5", "cc"
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);
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}
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@@ -0,0 +1,33 @@
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/**
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******************************************************************************
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* @file rp2350_reset.c
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* @author Kevin Thomas
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* @brief Reset controller driver implementation for RP2350.
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*
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* Releases IO_BANK0 from reset and waits until the subsystem
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* is ready.
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*
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2026 Kevin Thomas.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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*/
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#include "rp2350_reset.h"
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void reset_init_subsystem(void)
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{
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uint32_t value;
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value = RESETS->RESET;
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value &= ~(1U << RESETS_RESET_IO_BANK0_SHIFT);
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RESETS->RESET = value;
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while ((RESETS->RESET_DONE & (1U << RESETS_RESET_IO_BANK0_SHIFT)) == 0) {
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}
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}
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@@ -0,0 +1,48 @@
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/**
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******************************************************************************
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* @file rp2350_reset_handler.c
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* @author Kevin Thomas
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* @brief Reset handler implementation for RP2350.
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*
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* Entry point after power-on or system reset. Initializes the
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* stack, XOSC, subsystem resets, UART, TIMER0 tick generator,
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* coprocessor, then branches to main().
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*
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2026 Kevin Thomas.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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*/
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#include "rp2350_reset_handler.h"
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#include "rp2350_stack.h"
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#include "rp2350_xosc.h"
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#include "rp2350_reset.h"
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#include "rp2350_uart.h"
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#include "rp2350_timer.h"
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#include "rp2350_coprocessor.h"
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extern int main(void);
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void __attribute__((naked, noreturn)) Reset_Handler(void)
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{
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__asm__ volatile (
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"bl stack_init\n\t"
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"bl xosc_init\n\t"
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"bl xosc_enable_peri_clk\n\t"
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"bl reset_init_subsystem\n\t"
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"bl uart_release_reset\n\t"
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"bl uart_init\n\t"
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"bl timer_release_reset\n\t"
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"bl timer_tick_init\n\t"
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"bl coprocessor_enable\n\t"
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"b main\n\t"
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);
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}
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@@ -0,0 +1,38 @@
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/**
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******************************************************************************
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* @file rp2350_stack.c
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* @author Kevin Thomas
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* @brief Stack pointer initialization for RP2350.
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*
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* Sets MSP, PSP, MSPLIM, and PSPLIM using inline assembly.
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*
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2026 Kevin Thomas.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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*/
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#include "rp2350_stack.h"
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void stack_init(void)
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{
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__asm__ volatile (
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"ldr r0, =%0\n\t"
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"msr PSP, r0\n\t"
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"ldr r0, =%1\n\t"
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"msr MSPLIM, r0\n\t"
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"msr PSPLIM, r0\n\t"
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"ldr r0, =%0\n\t"
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"msr MSP, r0\n\t"
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:
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: "i" (STACK_TOP), "i" (STACK_LIMIT)
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: "r0"
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);
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}
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@@ -0,0 +1,136 @@
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/**
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******************************************************************************
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* @file rp2350_timer.c
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* @author Kevin Thomas
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* @brief TIMER0 alarm driver implementation for RP2350.
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*
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* Configures the TIMER0 tick generator for 1 us resolution
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* from the 12 MHz CLK_REF, then uses alarm 0 with NVIC IRQ
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* to implement a repeating callback at a configurable period.
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*
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2026 Kevin Thomas.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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*/
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#include "rp2350_timer.h"
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/**
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* @brief User callback and period stored for ISR re-arm.
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*/
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static timer_callback_t _user_callback;
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/**
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* @brief Alarm period in microseconds for re-arming.
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*/
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static uint32_t _alarm_period_us;
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/**
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* @brief Clear the TIMER0 reset bit in the reset controller.
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* @retval None
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*/
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static void _timer_clear_reset_bit(void)
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{
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uint32_t value;
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value = RESETS->RESET;
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value &= ~(1U << RESETS_RESET_TIMER0_SHIFT);
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RESETS->RESET = value;
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}
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/**
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* @brief Wait until the TIMER0 block is out of reset.
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* @retval None
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*/
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static void _timer_wait_reset_done(void)
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{
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while ((RESETS->RESET_DONE & (1U << RESETS_RESET_TIMER0_SHIFT)) == 0) {
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}
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}
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/**
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* @brief Set the TIMER0 tick generator cycle count to 12.
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* @retval None
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*/
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static void _timer_set_tick_cycles(void)
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{
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TICKS_TIMER0->CYCLES = TICKS_TIMER0_CYCLES_12MHZ;
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}
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/**
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* @brief Enable the TIMER0 tick generator.
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* @retval None
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*/
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static void _timer_enable_tick(void)
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{
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TICKS_TIMER0->CTRL = (1U << TICKS_CTRL_ENABLE_SHIFT);
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}
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/**
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* @brief Enable the alarm 0 interrupt in TIMER0 INTE register.
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* @retval None
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*/
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static void _timer_enable_alarm_irq(void)
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{
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TIMER0->INTE = (1U << TIMER_INTE_ALARM0_SHIFT);
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}
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/**
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* @brief Enable TIMER0_IRQ_0 in the NVIC.
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* @retval None
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*/
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static void _timer_enable_nvic(void)
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{
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*NVIC_ISER0 = (1U << TIMER0_ALARM0_IRQ);
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}
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/**
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* @brief Arm alarm 0 with the next target time.
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* @retval None
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*/
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static void _timer_arm_alarm(void)
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{
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uint32_t target;
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target = TIMER0->TIMERAWL + _alarm_period_us;
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TIMER0->ALARM0 = target;
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}
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void timer_release_reset(void)
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{
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_timer_clear_reset_bit();
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_timer_wait_reset_done();
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}
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void timer_tick_init(void)
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{
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_timer_set_tick_cycles();
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_timer_enable_tick();
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}
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void timer_alarm_start(uint32_t period_ms, timer_callback_t cb)
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{
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_user_callback = cb;
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_alarm_period_us = period_ms * 1000U;
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_timer_enable_alarm_irq();
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_timer_enable_nvic();
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_timer_arm_alarm();
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}
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/**
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* @brief TIMER0 alarm 0 interrupt handler (exception 16 + IRQ 0).
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* @retval None
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*/
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void TIMER0_IRQ_0_Handler(void)
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{
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TIMER0->INTR = TIMER_INTR_ALARM0_MASK;
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_timer_arm_alarm();
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if (_user_callback)
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_user_callback();
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}
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@@ -0,0 +1,126 @@
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/**
|
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******************************************************************************
|
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* @file rp2350_uart.c
|
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* @author Kevin Thomas
|
||||
* @brief UART0 driver implementation for RP2350.
|
||||
*
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* Configures UART0 on GPIO 0 (TX) and GPIO 1 (RX) at 115200
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* baud using the 12 MHz XOSC clock.
|
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*
|
||||
******************************************************************************
|
||||
* @attention
|
||||
*
|
||||
* Copyright (c) 2026 Kevin Thomas.
|
||||
* All rights reserved.
|
||||
*
|
||||
* This software is licensed under terms that can be found in the LICENSE file
|
||||
* in the root directory of this software component.
|
||||
* If no LICENSE file comes with this software, it is provided AS-IS.
|
||||
*
|
||||
******************************************************************************
|
||||
*/
|
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|
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#include "rp2350_uart.h"
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#define UART_BASE ((volatile uint32_t *) UART0_BASE)
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|
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/**
|
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* @brief Clear the UART0 reset bit in the reset controller.
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* @retval None
|
||||
*/
|
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static void _uart_clear_reset_bit(void)
|
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{
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uint32_t value;
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value = RESETS->RESET;
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value &= ~(1U << RESETS_RESET_UART0_SHIFT);
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RESETS->RESET = value;
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}
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|
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/**
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* @brief Wait until the UART0 block is out of reset.
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* @retval None
|
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*/
|
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static void _uart_wait_reset_done(void)
|
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{
|
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while ((RESETS->RESET_DONE & (1U << RESETS_RESET_UART0_SHIFT)) == 0) {
|
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}
|
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}
|
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|
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/**
|
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* @brief Configure GPIO pins 0 (TX) and 1 (RX) for UART function.
|
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* @retval None
|
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*/
|
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static void _uart_configure_pins(void)
|
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{
|
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IO_BANK0->GPIO[0].CTRL = IO_BANK0_CTRL_FUNCSEL_UART;
|
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IO_BANK0->GPIO[1].CTRL = IO_BANK0_CTRL_FUNCSEL_UART;
|
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PADS_BANK0->GPIO[0] = 0x04;
|
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PADS_BANK0->GPIO[1] = 0x40;
|
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}
|
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|
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/**
|
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* @brief Set UART0 baud rate divisors for 115200 at 12 MHz.
|
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* @retval None
|
||||
*/
|
||||
static void _uart_set_baud(void)
|
||||
{
|
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UART_BASE[UART_CR_OFFSET] = 0;
|
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UART_BASE[UART_IBRD_OFFSET] = 6;
|
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UART_BASE[UART_FBRD_OFFSET] = 33;
|
||||
}
|
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|
||||
/**
|
||||
* @brief Configure line control and enable UART0.
|
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* @retval None
|
||||
*/
|
||||
static void _uart_enable(void)
|
||||
{
|
||||
UART_BASE[UART_LCR_H_OFFSET] = UART_LCR_H_8N1_FIFO;
|
||||
UART_BASE[UART_CR_OFFSET] = UART_CR_ENABLE;
|
||||
}
|
||||
|
||||
void uart_release_reset(void)
|
||||
{
|
||||
_uart_clear_reset_bit();
|
||||
_uart_wait_reset_done();
|
||||
}
|
||||
|
||||
void uart_init(void)
|
||||
{
|
||||
_uart_configure_pins();
|
||||
_uart_set_baud();
|
||||
_uart_enable();
|
||||
}
|
||||
|
||||
bool uart_is_readable(void)
|
||||
{
|
||||
return (UART_BASE[UART_FR_OFFSET] & UART_FR_RXFE_MASK) == 0;
|
||||
}
|
||||
|
||||
char uart_getchar(void)
|
||||
{
|
||||
while (UART_BASE[UART_FR_OFFSET] & UART_FR_RXFE_MASK) {
|
||||
}
|
||||
return (char)(UART_BASE[UART_DR_OFFSET] & 0xFF);
|
||||
}
|
||||
|
||||
void uart_putchar(char c)
|
||||
{
|
||||
while (UART_BASE[UART_FR_OFFSET] & UART_FR_TXFF_MASK) {
|
||||
}
|
||||
UART_BASE[UART_DR_OFFSET] = (uint32_t)c;
|
||||
}
|
||||
|
||||
void uart_puts(const char *str)
|
||||
{
|
||||
while (*str) {
|
||||
uart_putchar(*str++);
|
||||
}
|
||||
}
|
||||
|
||||
char uart_to_upper(char c)
|
||||
{
|
||||
if (c >= 'a' && c <= 'z')
|
||||
return (char)(c - 32);
|
||||
return c;
|
||||
}
|
||||
@@ -0,0 +1,46 @@
|
||||
/**
|
||||
******************************************************************************
|
||||
* @file rp2350_xosc.c
|
||||
* @author Kevin Thomas
|
||||
* @brief XOSC driver implementation for RP2350.
|
||||
*
|
||||
* Configures the external crystal oscillator and enables the
|
||||
* peripheral clock sourced from XOSC.
|
||||
*
|
||||
******************************************************************************
|
||||
* @attention
|
||||
*
|
||||
* Copyright (c) 2026 Kevin Thomas.
|
||||
* All rights reserved.
|
||||
*
|
||||
* This software is licensed under terms that can be found in the LICENSE file
|
||||
* in the root directory of this software component.
|
||||
* If no LICENSE file comes with this software, it is provided AS-IS.
|
||||
*
|
||||
******************************************************************************
|
||||
*/
|
||||
|
||||
#include "rp2350_xosc.h"
|
||||
|
||||
void xosc_init(void)
|
||||
{
|
||||
XOSC->STARTUP = 0x00C4U;
|
||||
XOSC->CTRL = 0x00FABAA0U;
|
||||
while ((XOSC->STATUS & (1U << XOSC_STATUS_STABLE_SHIFT)) == 0) {
|
||||
}
|
||||
}
|
||||
|
||||
void xosc_enable_peri_clk(void)
|
||||
{
|
||||
uint32_t value;
|
||||
value = CLOCKS->CLK_PERI_CTRL;
|
||||
value &= ~CLK_PERI_CTRL_AUXSRC_MASK;
|
||||
value |= (1U << CLK_PERI_CTRL_ENABLE_SHIFT);
|
||||
value |= (CLK_PERI_CTRL_AUXSRC_XOSC << CLK_PERI_CTRL_AUXSRC_SHIFT);
|
||||
CLOCKS->CLK_PERI_CTRL = value;
|
||||
}
|
||||
|
||||
void xosc_set_clk_ref(void)
|
||||
{
|
||||
CLOCKS->CLK_REF_CTRL = CLK_REF_CTRL_SRC_XOSC;
|
||||
}
|
||||
@@ -0,0 +1,70 @@
|
||||
/**
|
||||
******************************************************************************
|
||||
* @file vector_table.c
|
||||
* @author Kevin Thomas
|
||||
* @brief Vector table with initial stack pointer, reset handler, and
|
||||
* TIMER0 alarm 0 IRQ handler.
|
||||
*
|
||||
* Placed in the .vectors section at the start of flash.
|
||||
* The Thumb bit (bit 0 = 1) is automatically set by the
|
||||
* linker for function pointers in Thumb mode.
|
||||
*
|
||||
******************************************************************************
|
||||
* @attention
|
||||
*
|
||||
* Copyright (c) 2026 Kevin Thomas.
|
||||
* All rights reserved.
|
||||
*
|
||||
* This software is licensed under terms that can be found in the LICENSE file
|
||||
* in the root directory of this software component.
|
||||
* If no LICENSE file comes with this software, it is provided AS-IS.
|
||||
*
|
||||
******************************************************************************
|
||||
*/
|
||||
|
||||
#include <stdint.h>
|
||||
|
||||
extern uint32_t _stack_top;
|
||||
extern void Reset_Handler(void);
|
||||
extern void TIMER0_IRQ_0_Handler(void);
|
||||
|
||||
/**
|
||||
* @brief Default handler for unused exceptions (infinite loop).
|
||||
* @retval None
|
||||
*/
|
||||
static void _default_handler(void)
|
||||
{
|
||||
while (1) {
|
||||
}
|
||||
}
|
||||
|
||||
typedef void (*vector_func_t)(void);
|
||||
|
||||
/**
|
||||
* @brief Vector table placed in .vectors section
|
||||
*
|
||||
* Entry 0: Initial SP
|
||||
* Entry 1: Reset handler
|
||||
* Entries 2-15: System exceptions (NMI, HardFault, etc.)
|
||||
* Entry 16: IRQ 0 = TIMER0_IRQ_0
|
||||
*/
|
||||
__attribute__((section(".vectors"), used))
|
||||
const void *_vectors[17] = {
|
||||
&_stack_top, // 0: Initial stack pointer
|
||||
Reset_Handler, // 1: Reset
|
||||
_default_handler, // 2: NMI
|
||||
_default_handler, // 3: HardFault
|
||||
_default_handler, // 4: MemManage
|
||||
_default_handler, // 5: BusFault
|
||||
_default_handler, // 6: UsageFault
|
||||
_default_handler, // 7: SecureFault
|
||||
0, // 8: Reserved
|
||||
0, // 9: Reserved
|
||||
0, // 10: Reserved
|
||||
_default_handler, // 11: SVCall
|
||||
_default_handler, // 12: DebugMon
|
||||
0, // 13: Reserved
|
||||
_default_handler, // 14: PendSV
|
||||
_default_handler, // 15: SysTick
|
||||
TIMER0_IRQ_0_Handler, // 16: IRQ 0 — TIMER0_IRQ_0
|
||||
};
|
||||
Reference in New Issue
Block a user