mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-07-09 22:08:42 +02:00
Add bare-metal I2C driver for RP2350 (0x07_i2c_cbm)
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 +1,54 @@
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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 I2C demonstration: scan all 7-bit addresses and report devices.
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*
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* Demonstrates I2C bus scanning using the bare-metal I2C driver.
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* I2C1 is configured at 100 kHz on SDA=GPIO2 / SCL=GPIO3. A
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* formatted hex table of all responding device addresses is
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* printed over UART and repeated every 5 seconds.
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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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* GPIO2 -> I2C device SDA (4.7 kohm pull-up to 3.3 V)
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* GPIO3 -> I2C device SCL (4.7 kohm pull-up to 3.3 V)
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* 3.3V -> I2C device VCC
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* GND -> I2C device GND
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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_i2c.h"
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#include "rp2350_uart.h"
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#include "rp2350_xosc.h"
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#include "rp2350_delay.h"
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#define SCAN_DELAY_MS 5000
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/**
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* @brief Application entry point for the I2C bus scanner 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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xosc_set_clk_ref();
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i2c_release_reset();
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i2c_init();
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uart_puts("I2C driver initialized: I2C1 @ 100 kHz SDA=GPIO2 SCL=GPIO3\r\n");
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while (1) {
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i2c_scan();
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delay_ms(SCAN_DELAY_MS);
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}
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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 +1,39 @@
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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 delay calibrated for a 14.5 MHz clock
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* (3600 loop iterations per millisecond).
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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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@@ -0,0 +1,179 @@
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/**
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******************************************************************************
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* @file rp2350_i2c.c
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* @author Kevin Thomas
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* @brief RP2350 I2C1 master-mode driver implementation.
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*
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* Bare-metal driver for the RP2350 Synopsys DW APB I2C controller.
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* Configures I2C1 at 100 kHz on SDA=GPIO2 / SCL=GPIO3 with
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* internal pull-ups. Provides address probing and bus scanning.
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* All register accesses verified against the RP2350 datasheet
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* (RP-008373-DS-2).
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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_i2c.h"
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#include "rp2350_uart.h"
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/**
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* @brief Configure GPIO2 and GPIO3 pads for I2C (input enabled, pull-up).
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*
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* Clears pad isolation, enables input, enables pull-up, and sets
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* drive strength to 4 mA on both SDA and SCL pins.
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*
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* @retval None
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*/
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static void _i2c_config_pads(void)
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{
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uint32_t pad_val = (1U << PADS_BANK0_IE_SHIFT) | (1U << PADS_BANK0_PUE_SHIFT) | (1U << 4);
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PADS_BANK0->GPIO[I2C_SDA_PIN] = pad_val;
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PADS_BANK0->GPIO[I2C_SCL_PIN] = pad_val;
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}
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/**
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* @brief Set GPIO2 and GPIO3 IO mux function to I2C (FUNCSEL=3).
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* @retval None
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*/
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static void _i2c_config_gpio(void)
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{
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IO_BANK0->GPIO[I2C_SDA_PIN].CTRL = IO_BANK0_CTRL_FUNCSEL_I2C;
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IO_BANK0->GPIO[I2C_SCL_PIN].CTRL = IO_BANK0_CTRL_FUNCSEL_I2C;
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}
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/**
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* @brief Configure I2C1 as fast-mode master with 7-bit addressing.
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*
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* Sets MASTER_MODE, SPEED=FAST, IC_SLAVE_DISABLE, IC_RESTART_EN,
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* and TX_EMPTY_CTRL bits in the CON register.
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*
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* @retval None
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*/
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static void _i2c_config_con(void)
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{
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I2C1->CON = (1U << I2C_CON_MASTER_MODE_SHIFT)
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| (I2C_CON_SPEED_FAST << I2C_CON_SPEED_SHIFT)
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| (1U << I2C_CON_IC_RESTART_EN_SHIFT)
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| (1U << I2C_CON_IC_SLAVE_DISABLE_SHIFT)
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| (1U << I2C_CON_TX_EMPTY_CTRL_SHIFT);
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}
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/**
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* @brief Program SCL timing for 100 kHz at 12 MHz clk_sys.
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*
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* Sets fast-mode SCL high/low counts, SDA hold time, and
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* spike suppression length.
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*
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* @retval None
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*/
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static void _i2c_config_timing(void)
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{
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I2C1->FS_SCL_HCNT = I2C_FS_SCL_HCNT_VAL;
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I2C1->FS_SCL_LCNT = I2C_FS_SCL_LCNT_VAL;
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I2C1->FS_SPKLEN = I2C_FS_SPKLEN_VAL;
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I2C1->SDA_HOLD = I2C_SDA_TX_HOLD_VAL;
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}
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/**
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* @brief Print a two-digit uppercase hex number over UART.
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* @param val byte value to print (0x00-0xFF)
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* @retval None
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*/
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static void _print_hex8(uint8_t val)
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{
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const char hex[] = "0123456789ABCDEF";
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char buf[3] = { hex[val >> 4], hex[val & 0x0F], '\0' };
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uart_puts(buf);
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}
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/**
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* @brief Print a single scan table entry for the given address.
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*
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* Prints the row header at 16-byte boundaries, then the address
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* if a device responds, dashes if not, or blanks for reserved
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* ranges.
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*
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* @param addr 7-bit I2C address (0x00-0x7F)
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* @retval None
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*/
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static void _print_scan_entry(uint8_t addr)
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{
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if (addr % 16 == 0) { _print_hex8(addr); uart_puts(": "); }
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if (addr < 0x08 || addr > 0x77) {
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uart_puts(" ");
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} else if (i2c_probe(addr)) {
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_print_hex8(addr);
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uart_puts(" ");
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} else {
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uart_puts("-- ");
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}
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if (addr % 16 == 15) { uart_puts("\r\n"); }
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}
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void i2c_release_reset(void)
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{
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RESETS->RESET |= (1U << RESETS_RESET_I2C1_SHIFT);
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RESETS->RESET &= ~(1U << RESETS_RESET_I2C1_SHIFT);
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while (!(RESETS->RESET_DONE & (1U << RESETS_RESET_I2C1_SHIFT))) {
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}
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}
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void i2c_init(void)
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{
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_i2c_config_pads();
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_i2c_config_gpio();
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I2C1->ENABLE = 0U;
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_i2c_config_con();
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I2C1->TX_TL = 0U;
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I2C1->RX_TL = 0U;
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_i2c_config_timing();
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I2C1->ENABLE = 1U;
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}
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bool i2c_probe(uint8_t addr)
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{
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I2C1->ENABLE = 0U;
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I2C1->TAR = addr;
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I2C1->ENABLE = 1U;
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(void)I2C1->CLR_TX_ABRT;
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I2C1->DATA_CMD = (1U << I2C_DATA_CMD_CMD_SHIFT) | (1U << I2C_DATA_CMD_STOP_SHIFT);
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uint32_t timeout = I2C_TIMEOUT;
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bool aborted = false;
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while (timeout > 0U) {
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if (I2C1->RAW_INTR_STAT & I2C_RAW_INTR_TX_ABRT) {
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aborted = true;
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break;
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}
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if (I2C1->RXFLR) {
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break;
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}
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timeout--;
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}
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if (aborted) {
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(void)I2C1->CLR_TX_ABRT;
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}
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(void)I2C1->CLR_STOP_DET;
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if (!aborted && I2C1->RXFLR) {
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(void)I2C1->DATA_CMD;
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}
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return !aborted && timeout > 0U;
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}
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void i2c_scan(void)
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{
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uart_puts("\r\nI2C bus scan:\r\n");
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uart_puts(" 0 1 2 3 4 5 6 7 8 9 A B C D E F\r\n");
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for (uint8_t addr = 0; addr < 128; addr++) {
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_print_scan_entry(addr);
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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.
|
||||
* 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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*/
|
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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 +1,45 @@
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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, coprocessor, then
|
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* branches to main().
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*
|
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******************************************************************************
|
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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_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_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 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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/**
|
||||
******************************************************************************
|
||||
* @file rp2350_stack.c
|
||||
* @author Kevin Thomas
|
||||
* @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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*
|
||||
******************************************************************************
|
||||
* @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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#include "rp2350_stack.h"
|
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|
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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)
|
||||
: "r0"
|
||||
);
|
||||
}
|
||||
@@ -0,0 +1,126 @@
|
||||
/**
|
||||
******************************************************************************
|
||||
* @file rp2350_uart.c
|
||||
* @author Kevin Thomas
|
||||
* @brief UART0 driver implementation for RP2350.
|
||||
*
|
||||
* Configures UART0 on GPIO 0 (TX) and GPIO 1 (RX) at 115200
|
||||
* baud using the 14.5 MHz XOSC clock.
|
||||
*
|
||||
******************************************************************************
|
||||
* @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_uart.h"
|
||||
|
||||
#define UART_BASE ((volatile uint32_t *) UART0_BASE)
|
||||
|
||||
/**
|
||||
* @brief Clear the UART0 reset bit in the reset controller.
|
||||
* @retval None
|
||||
*/
|
||||
static void _uart_clear_reset_bit(void)
|
||||
{
|
||||
uint32_t value;
|
||||
value = RESETS->RESET;
|
||||
value &= ~(1U << RESETS_RESET_UART0_SHIFT);
|
||||
RESETS->RESET = value;
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief Wait until the UART0 block is out of reset.
|
||||
* @retval None
|
||||
*/
|
||||
static void _uart_wait_reset_done(void)
|
||||
{
|
||||
while ((RESETS->RESET_DONE & (1U << RESETS_RESET_UART0_SHIFT)) == 0) {
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief Configure GPIO pins 0 (TX) and 1 (RX) for UART function.
|
||||
* @retval None
|
||||
*/
|
||||
static void _uart_configure_pins(void)
|
||||
{
|
||||
IO_BANK0->GPIO[0].CTRL = IO_BANK0_CTRL_FUNCSEL_UART;
|
||||
IO_BANK0->GPIO[1].CTRL = IO_BANK0_CTRL_FUNCSEL_UART;
|
||||
PADS_BANK0->GPIO[0] = 0x04;
|
||||
PADS_BANK0->GPIO[1] = 0x40;
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief Set UART0 baud rate divisors for 115200 at 14.5 MHz.
|
||||
* @retval None
|
||||
*/
|
||||
static void _uart_set_baud(void)
|
||||
{
|
||||
UART_BASE[UART_CR_OFFSET] = 0;
|
||||
UART_BASE[UART_IBRD_OFFSET] = 6;
|
||||
UART_BASE[UART_FBRD_OFFSET] = 33;
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief Configure line control and enable UART0.
|
||||
* @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 +1,38 @@
|
||||
/**
|
||||
******************************************************************************
|
||||
* @file vector_table.c
|
||||
* @author Kevin Thomas
|
||||
* @brief Vector table with initial stack pointer and reset 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);
|
||||
|
||||
typedef void (*vector_func_t)(void);
|
||||
|
||||
/**
|
||||
* @brief Vector table placed in .vectors section
|
||||
*/
|
||||
__attribute__((section(".vectors"), used))
|
||||
const void *_vectors[2] = {
|
||||
&_stack_top,
|
||||
Reset_Handler
|
||||
};
|
||||
Reference in New Issue
Block a user