mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-08-17 16:37:20 +02:00
Add 0x04_pwm_cbm: bare-metal RP2350 PWM driver
- PWM slice 4, channel B on GPIO25 (onboard LED) - Duty cycle sweep 0-100% in 5% steps for breathing effect - Wrap 9999 with no clock division (~650 Hz from ROSC) - UART reports each duty step - 1390B FLASH, 11 source files, zero warnings
This commit is contained in:
Kevin Thomas
@@ -0,0 +1,214 @@
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/**
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******************************************************************************
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* @file rp2350.h
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* @author Kevin Thomas
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* @brief RP2350 Device Peripheral Access Layer Header File.
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*
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* Memory-mapped register structures and peripheral base addresses
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* for the RP2350 microcontroller (Cortex-M33 dual-core). All
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* register offsets 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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#ifndef __RP2350_H
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#define __RP2350_H
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#include <stdint.h>
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#include <stdbool.h>
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/*!< Defines 'read / write' permissions */
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#define __IO volatile
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/*!< Stack addresses */
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#define STACK_TOP 0x20082000UL
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#define STACK_LIMIT 0x2007A000UL
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/*!< Memory map */
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#define XIP_BASE 0x10000000UL
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#define SRAM_BASE 0x20000000UL
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#define SIO_BASE 0xD0000000UL
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#define PPB_BASE 0xE0000000UL
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/*!< APB peripherals */
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#define CLOCKS_BASE 0x40010000UL
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#define RESETS_BASE 0x40020000UL
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#define IO_BANK0_BASE 0x40028000UL
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#define PADS_BANK0_BASE 0x40038000UL
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#define XOSC_BASE 0x40048000UL
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#define UART0_BASE 0x40070000UL
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#define PWM_BASE 0x400A8000UL
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/**
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* @brief XOSC (External Crystal Oscillator)
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*/
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typedef struct
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{
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__IO uint32_t CTRL; // Control register Address offset: 0x00
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__IO uint32_t STATUS; // Status register Address offset: 0x04
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__IO uint32_t DORMANT; // Dormant mode Address offset: 0x08
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__IO uint32_t STARTUP; // Startup delay Address offset: 0x0C
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__IO uint32_t COUNT; // Frequency count Address offset: 0x10
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} XOSC_TypeDef;
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/**
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* @brief CLOCKS
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*/
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typedef struct
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{
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__IO uint32_t RESERVED0[18]; // Other clock registers Address offset: 0x00-0x44
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__IO uint32_t CLK_PERI_CTRL; // Peripheral clock control Address offset: 0x48
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} CLOCKS_TypeDef;
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/**
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* @brief RESETS
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*/
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typedef struct
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{
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__IO uint32_t RESET; // Reset control Address offset: 0x00
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__IO uint32_t WDSEL; // Watchdog select Address offset: 0x04
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__IO uint32_t RESET_DONE; // Reset done status Address offset: 0x08
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} RESETS_TypeDef;
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/**
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* @brief IO_BANK0 GPIO Control (one per GPIO)
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*/
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typedef struct
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{
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__IO uint32_t STATUS; // GPIO status Address offset: 0x00
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__IO uint32_t CTRL; // GPIO control Address offset: 0x04
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} IO_BANK0_GPIO_TypeDef;
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/**
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* @brief IO_BANK0
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*/
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typedef struct
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{
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IO_BANK0_GPIO_TypeDef GPIO[30]; // GPIO 0-29 status/ctrl pairs Address offset: 0x000-0x0E8
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} IO_BANK0_TypeDef;
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/**
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* @brief PADS_BANK0
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*/
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typedef struct
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{
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__IO uint32_t VOLTAGE_SELECT; // Voltage select Address offset: 0x00
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__IO uint32_t GPIO[30]; // GPIO 0-29 pad control Address offset: 0x04-0x78
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} PADS_BANK0_TypeDef;
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/**
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* @brief Peripheral Definitions
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*/
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#define XOSC ((XOSC_TypeDef *) XOSC_BASE)
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#define CLOCKS ((CLOCKS_TypeDef *) CLOCKS_BASE)
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#define RESETS ((RESETS_TypeDef *) RESETS_BASE)
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#define IO_BANK0 ((IO_BANK0_TypeDef *) IO_BANK0_BASE)
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#define PADS_BANK0 ((PADS_BANK0_TypeDef *) PADS_BANK0_BASE)
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#define SIO ((volatile uint32_t *) SIO_BASE)
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#define CPACR ((volatile uint32_t *) (PPB_BASE + 0x0ED88UL))
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/**
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* @brief XOSC bit definitions
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*/
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#define XOSC_STATUS_STABLE_SHIFT 31U
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/**
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* @brief CPACR bit definitions
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*/
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#define CPACR_CP0_SHIFT 0U
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#define CPACR_CP1_SHIFT 1U
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/**
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* @brief CLOCKS bit definitions
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*/
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#define CLK_PERI_CTRL_ENABLE_SHIFT 11U
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#define CLK_PERI_CTRL_AUXSRC_SHIFT 5U
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#define CLK_PERI_CTRL_AUXSRC_XOSC 4U
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/**
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* @brief RESETS bit definitions
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*/
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#define RESETS_RESET_IO_BANK0_SHIFT 6U
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#define RESETS_RESET_PWM_SHIFT 16U
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#define RESETS_RESET_UART0_SHIFT 26U
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/**
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* @brief IO_BANK0 bit definitions
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*/
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#define IO_BANK0_CTRL_FUNCSEL_MASK 0x1FU
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#define IO_BANK0_CTRL_FUNCSEL_UART 0x02U
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#define IO_BANK0_CTRL_FUNCSEL_PWM 0x04U
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#define IO_BANK0_CTRL_FUNCSEL_SIO 0x05U
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/**
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* @brief PADS_BANK0 bit definitions
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*/
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#define PADS_BANK0_OD_SHIFT 7U
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#define PADS_BANK0_IE_SHIFT 6U
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#define PADS_BANK0_ISO_SHIFT 8U
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/**
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* @brief UART register offsets (word indices from UART0_BASE)
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*/
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#define UART_DR_OFFSET (0x000U / 4U)
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#define UART_FR_OFFSET (0x018U / 4U)
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#define UART_IBRD_OFFSET (0x024U / 4U)
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#define UART_FBRD_OFFSET (0x028U / 4U)
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#define UART_LCR_H_OFFSET (0x02CU / 4U)
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#define UART_CR_OFFSET (0x030U / 4U)
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/**
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* @brief UART flag register bit definitions
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*/
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#define UART_FR_TXFF_MASK 32U
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#define UART_FR_RXFE_MASK 16U
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/**
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* @brief UART line control and enable values
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*/
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#define UART_LCR_H_8N1_FIFO 0x70U
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#define UART_CR_ENABLE ((3U << 8) | 1U)
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/**
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* @brief GPIO pin definitions
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*/
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#define LED_PIN 25U
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/**
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* @brief SIO GPIO register offsets (word indices from SIO_BASE)
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*/
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#define SIO_GPIO_IN_OFFSET (0x004U / 4U)
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#define SIO_GPIO_OUT_SET_OFFSET (0x018U / 4U)
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#define SIO_GPIO_OUT_CLR_OFFSET (0x020U / 4U)
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#define SIO_GPIO_OUT_XOR_OFFSET (0x028U / 4U)
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#define SIO_GPIO_OE_SET_OFFSET (0x038U / 4U)
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/**
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* @brief PWM register offsets (per slice, stride 0x14)
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*/
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#define PWM_CH_CSR_OFFSET 0x00U
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#define PWM_CH_DIV_OFFSET 0x04U
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#define PWM_CH_CC_OFFSET 0x0CU
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#define PWM_CH_TOP_OFFSET 0x10U
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#define PWM_CH_STRIDE 0x14U
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/**
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* @brief PWM bit definitions
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*/
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#define PWM_CSR_EN_SHIFT 0U
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#define PWM_DIV_INT_SHIFT 4U
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#define PWM_CC_B_SHIFT 16U
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#define PWM_WRAP_DEFAULT 9999U
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#endif /* __RP2350_H */
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@@ -0,0 +1,33 @@
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/**
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******************************************************************************
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* @file rp2350_coprocessor.h
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* @author Kevin Thomas
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* @brief Coprocessor access control driver header for RP2350.
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*
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* Enables coprocessor access via the CPACR register.
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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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#ifndef __RP2350_COPROCESSOR_H
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#define __RP2350_COPROCESSOR_H
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#include "rp2350.h"
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/**
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* @brief Enable coprocessor access via CPACR with DSB/ISB barriers.
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* @retval None
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*/
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void coprocessor_enable(void);
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#endif /* __RP2350_COPROCESSOR_H */
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@@ -0,0 +1,34 @@
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/**
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******************************************************************************
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* @file rp2350_delay.h
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* @author Kevin Thomas
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* @brief Delay driver header for RP2350.
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*
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* Millisecond busy-wait delay calibrated for a 14.5 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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#ifndef __RP2350_DELAY_H
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#define __RP2350_DELAY_H
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#include "rp2350.h"
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/**
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* @brief Delay for the specified number of milliseconds.
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* @param ms number of milliseconds to delay
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* @retval None
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*/
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void delay_ms(uint32_t ms);
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#endif /* __RP2350_DELAY_H */
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@@ -0,0 +1,63 @@
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/**
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******************************************************************************
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* @file rp2350_gpio.h
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* @author Kevin Thomas
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* @brief GPIO driver header for RP2350.
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*
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* SIO-based GPIO configuration, set, clear, toggle, and read
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* functions for the RP2350 GPIO pins 0-29.
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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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#ifndef __RP2350_GPIO_H
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#define __RP2350_GPIO_H
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#include "rp2350.h"
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/**
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* @brief Configure a GPIO pin as SIO output.
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* @param gpio_num GPIO pin number (0-29)
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* @retval None
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*/
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void gpio_config(uint32_t gpio_num);
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/**
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* @brief Drive a GPIO output high.
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* @param gpio_num GPIO pin number (0-29)
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* @retval None
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*/
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void gpio_set(uint32_t gpio_num);
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/**
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* @brief Drive a GPIO output low.
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* @param gpio_num GPIO pin number (0-29)
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* @retval None
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*/
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void gpio_clear(uint32_t gpio_num);
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/**
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* @brief Toggle a GPIO output.
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* @param gpio_num GPIO pin number (0-29)
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* @retval None
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*/
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void gpio_toggle(uint32_t gpio_num);
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/**
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* @brief Read the current input level of a GPIO pin.
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* @param gpio_num GPIO pin number (0-29)
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* @retval bool true if pin is high, false if low
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*/
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bool gpio_get(uint32_t gpio_num);
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#endif /* __RP2350_GPIO_H */
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@@ -0,0 +1,63 @@
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/**
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******************************************************************************
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* @file rp2350_led.h
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* @author Kevin Thomas
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* @brief LED driver header for RP2350.
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*
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* High-level GPIO output / LED driver wrapping the
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* low-level GPIO functions.
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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.
|
||||
*
|
||||
* 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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#ifndef __RP2350_LED_H
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#define __RP2350_LED_H
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#include "rp2350.h"
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/**
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* @brief Initialize a GPIO pin as a push-pull digital output.
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* @param pin GPIO pin number to configure
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* @retval None
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*/
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void led_init(uint32_t pin);
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/**
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* @brief Drive the output pin high (LED on).
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* @param pin GPIO pin number
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* @retval None
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*/
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void led_on(uint32_t pin);
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/**
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* @brief Drive the output pin low (LED off).
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* @param pin GPIO pin number
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* @retval None
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*/
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void led_off(uint32_t pin);
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/**
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* @brief Toggle the current state of the output pin.
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* @param pin GPIO pin number
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* @retval None
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*/
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void led_toggle(uint32_t pin);
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/**
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* @brief Query the current drive state of the output pin.
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* @param pin GPIO pin number
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* @retval bool true if the pin is driven high, false if low
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*/
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bool led_get_state(uint32_t pin);
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#endif /* __RP2350_LED_H */
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@@ -0,0 +1,48 @@
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/**
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******************************************************************************
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* @file rp2350_pwm.h
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* @author Kevin Thomas
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* @brief PWM driver header for RP2350.
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*
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* Provides PWM output on GPIO 25 (onboard LED) at approximately
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* 1 kHz using PWM slice 4, channel B. Duty cycle is controllable
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* from 0 to 100 percent.
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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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#ifndef __RP2350_PWM_H
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#define __RP2350_PWM_H
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#include "rp2350.h"
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/**
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* @brief Release PWM from reset and wait until ready.
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* @retval None
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*/
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void pwm_release_reset(void);
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/**
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* @brief Initialize PWM on GPIO 25 at approximately 1 kHz.
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* @retval None
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*/
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void pwm_init(void);
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/**
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* @brief Set the PWM duty cycle as an integer percentage.
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* @param percent duty cycle from 0 (off) to 100 (fully on)
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* @retval None
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*/
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void pwm_set_duty(uint8_t percent);
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#endif /* __RP2350_PWM_H */
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@@ -0,0 +1,33 @@
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/**
|
||||
******************************************************************************
|
||||
* @file rp2350_reset.h
|
||||
* @author Kevin Thomas
|
||||
* @brief Reset controller driver header for RP2350.
|
||||
*
|
||||
* Provides subsystem reset release for IO_BANK0.
|
||||
*
|
||||
******************************************************************************
|
||||
* @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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#ifndef __RP2350_RESET_H
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#define __RP2350_RESET_H
|
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|
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#include "rp2350.h"
|
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|
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/**
|
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* @brief Release IO_BANK0 from reset and wait until ready.
|
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* @retval None
|
||||
*/
|
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void reset_init_subsystem(void);
|
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|
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#endif /* __RP2350_RESET_H */
|
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@@ -0,0 +1,33 @@
|
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/**
|
||||
******************************************************************************
|
||||
* @file rp2350_reset_handler.h
|
||||
* @author Kevin Thomas
|
||||
* @brief Reset handler header for RP2350.
|
||||
*
|
||||
* Entry point after reset. Performs stack initialization, XOSC
|
||||
* setup, subsystem reset release, UART initialization,
|
||||
* coprocessor enable, and branches to main().
|
||||
*
|
||||
******************************************************************************
|
||||
* @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.
|
||||
*
|
||||
******************************************************************************
|
||||
*/
|
||||
|
||||
#ifndef __RP2350_RESET_HANDLER_H
|
||||
#define __RP2350_RESET_HANDLER_H
|
||||
|
||||
/**
|
||||
* @brief Reset handler entry point (naked, noreturn).
|
||||
* @retval None
|
||||
*/
|
||||
void Reset_Handler(void) __attribute__((noreturn));
|
||||
|
||||
#endif /* __RP2350_RESET_HANDLER_H */
|
||||
@@ -0,0 +1,34 @@
|
||||
/**
|
||||
******************************************************************************
|
||||
* @file rp2350_stack.h
|
||||
* @author Kevin Thomas
|
||||
* @brief Stack pointer initialization header for RP2350.
|
||||
*
|
||||
* Sets MSP, PSP, MSPLIM, and PSPLIM from the STACK_TOP and
|
||||
* STACK_LIMIT values defined in rp2350.h.
|
||||
*
|
||||
******************************************************************************
|
||||
* @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.
|
||||
*
|
||||
******************************************************************************
|
||||
*/
|
||||
|
||||
#ifndef __RP2350_STACK_H
|
||||
#define __RP2350_STACK_H
|
||||
|
||||
#include "rp2350.h"
|
||||
|
||||
/**
|
||||
* @brief Initialize MSP, PSP, MSPLIM, and PSPLIM stack pointers.
|
||||
* @retval None
|
||||
*/
|
||||
void stack_init(void);
|
||||
|
||||
#endif /* __RP2350_STACK_H */
|
||||
@@ -0,0 +1,73 @@
|
||||
/**
|
||||
******************************************************************************
|
||||
* @file rp2350_uart.h
|
||||
* @author Kevin Thomas
|
||||
* @brief UART0 driver header for RP2350.
|
||||
*
|
||||
* Bare-metal UART0 driver supporting TX/RX on GPIO 0/1 at
|
||||
* 115200 baud (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.
|
||||
*
|
||||
******************************************************************************
|
||||
*/
|
||||
|
||||
#ifndef __RP2350_UART_H
|
||||
#define __RP2350_UART_H
|
||||
|
||||
#include "rp2350.h"
|
||||
|
||||
/**
|
||||
* @brief Release UART0 from reset and wait until ready.
|
||||
* @retval None
|
||||
*/
|
||||
void uart_release_reset(void);
|
||||
|
||||
/**
|
||||
* @brief Initialize UART0 pins, baud rate, line control, and enable.
|
||||
* @retval None
|
||||
*/
|
||||
void uart_init(void);
|
||||
|
||||
/**
|
||||
* @brief Check whether a received byte is waiting in the UART FIFO.
|
||||
* @retval bool true if at least one byte is available
|
||||
*/
|
||||
bool uart_is_readable(void);
|
||||
|
||||
/**
|
||||
* @brief Read one character from UART0 (blocking).
|
||||
* @retval char the received character
|
||||
*/
|
||||
char uart_getchar(void);
|
||||
|
||||
/**
|
||||
* @brief Transmit one character over UART0 (blocking).
|
||||
* @param c character to transmit
|
||||
* @retval None
|
||||
*/
|
||||
void uart_putchar(char c);
|
||||
|
||||
/**
|
||||
* @brief Transmit a null-terminated string over UART0.
|
||||
* @param str pointer to the string to send
|
||||
* @retval None
|
||||
*/
|
||||
void uart_puts(const char *str);
|
||||
|
||||
/**
|
||||
* @brief Convert a lowercase ASCII character to uppercase.
|
||||
* @param c input character
|
||||
* @retval char uppercase equivalent or original character
|
||||
*/
|
||||
char uart_to_upper(char c);
|
||||
|
||||
#endif /* __RP2350_UART_H */
|
||||
@@ -0,0 +1,40 @@
|
||||
/**
|
||||
******************************************************************************
|
||||
* @file rp2350_xosc.h
|
||||
* @author Kevin Thomas
|
||||
* @brief XOSC driver header for RP2350.
|
||||
*
|
||||
* External crystal oscillator initialization and peripheral
|
||||
* clock enable using the XOSC registers.
|
||||
*
|
||||
******************************************************************************
|
||||
* @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.
|
||||
*
|
||||
******************************************************************************
|
||||
*/
|
||||
|
||||
#ifndef __RP2350_XOSC_H
|
||||
#define __RP2350_XOSC_H
|
||||
|
||||
#include "rp2350.h"
|
||||
|
||||
/**
|
||||
* @brief Initialize the external crystal oscillator and wait until stable.
|
||||
* @retval None
|
||||
*/
|
||||
void xosc_init(void);
|
||||
|
||||
/**
|
||||
* @brief Enable the XOSC peripheral clock via CLK_PERI_CTRL.
|
||||
* @retval None
|
||||
*/
|
||||
void xosc_enable_peri_clk(void);
|
||||
|
||||
#endif /* __RP2350_XOSC_H */
|
||||
Reference in New Issue
Block a user