mirror of
https://github.com/eddyem/stm32samples.git
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continue developing GPIO config; not tested yet
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Edward Emelianov
117
F0:F030,F042,F072/usbcan_gpio/gpio.c
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117
F0:F030,F042,F072/usbcan_gpio/gpio.c
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/*
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* This file is part of the usbcangpio project.
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* Copyright 2026 Edward V. Emelianov <edward.emelianoff@gmail.com>.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stm32f0.h>
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#include "flash.h"
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#include "gpio.h"
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// TODO: remove AFmask, make function to get right AF number by pin's FuncValues
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typedef struct{
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funcvalues_t vals;
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uint8_t AFmask;
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} pinprops_t;
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static const pinprops_t pin_props[2][16] = {
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[0] = { // PORT A
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[0] = { .vals.flags = 0b00000001, .AFmask = (1<<2) }, // PA0: ADC0, AF2 (TIM2_CH1)
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[1] = { .vals.flags = 0b00000001, .AFmask = (1<<2) }, // PA1: ADC1, AF2 (TIM2_CH2)
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[2] = { .vals.flags = 0b00000011, .AFmask = (1<<2) | (1<<1) }, // PA2: ADC2, AF2 (TIM2_CH3), AF1 (USART2_TX)
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[3] = { .vals.flags = 0b00000011, .AFmask = (1<<2) | (1<<1) }, // PA3: ADC3, AF2 (TIM2_CH4), AF1 (USART2_RX)
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[5] = { .vals.flags = 0b00000101, .AFmask = (1<<0) }, // PA5: ADC5, SPI1_SCK (AF0)
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[6] = { .vals.flags = 0b00000101, .AFmask = (1<<0) }, // PA6: ADC6, SPI1_MISO (AF0)
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[7] = { .vals.flags = 0b00000101, .AFmask = (1<<0) }, // PA7: ADC7, SPI1_MOSI (AF0)
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[9] = { .vals.flags = 0b00000010, .AFmask = (1<<1) }, // PA9: USART1_TX (AF1)
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[10] = { .vals.flags = 0b00000010, .AFmask = (1<<1) }, // PA10: USART1_RX (AF1)
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},
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[1] = { // PORT B
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[0] = { .vals.flags = 0b00000001, .AFmask = (1<<2) | (1<<3) }, // PB0: ADC8, TIM3_CH3 (AF1), TIM1_CH2N (AF2)
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[1] = { .vals.flags = 0b00000001, .AFmask = (1<<0) | (1<<1) | (1<<2) }, // PB1: ADC9, TIM14_CH1 (AF0), TIM3_CH4 (AF1), TIM1_CH3N (AF2)
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[2] = { .vals.flags = 0b00000000, .AFmask = 0 }, // PB2: nothing except GPIO
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[3] = { .vals.flags = 0b00000100, .AFmask = (1<<0) | (1<<2) }, // PB3: SPI1_SCK (AF0), TIM2_CH2 (AF2)
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[4] = { .vals.flags = 0b00000100, .AFmask = (1<<0) | (1<<1) }, // PB4: SPI1_MISO (AF0), TIM3_CH1 (AF1)
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[5] = { .vals.flags = 0b00000100, .AFmask = (1<<0) | (1<<1) }, // PB5: SPI1_MOSI (AF0), TIM3_CH2 (AF1)
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[6] = { .vals.flags = 0b00000010, .AFmask = (1<<0) | (1<<1) | (1<<2) }, // PB6: USART1_TX (AF0), I2C1_SCL (AF1), TIM16_CH1N (AF2)
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[7] = { .vals.flags = 0b00000010, .AFmask = (1<<0) | (1<<1) | (1<<2) }, // PB7: USART1_RX (AF0), I2C1_SDA (AF1), TIM17_CH1N (AF2)
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[10] = { .vals.flags = 0b00000000, .AFmask = (1<<1) | (1<<2) }, // PB10: I2C1_SCL (AF1), TIM2_CH3 (AF2)
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[11] = { .vals.flags = 0b00000000, .AFmask = (1<<1) | (1<<2) }, // PB11: I2C1_SDA (AF1), TIM2_CH4 (AF2)
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}
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};
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static int is_disabled(uint8_t port, uint8_t pin){
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if(port > 1 || pin > 15) return FALSE;
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if(!the_conf.pinconfig[port][pin].enable) return FALSE;
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return TRUE;
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}
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/**
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* @brief is_func_allowed - check if alternate function `afno` allowed on given pin
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* @param port - 0 for GPIOA and 1 for GPIOB
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* @param pin - 0..15
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* @param afno - number of alternate function
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* @return TRUE if all OK
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*/
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int is_func_allowed(uint8_t port, uint8_t pin, pinconfig_t *pcfg){
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if(is_disabled(port, pin)) return FALSE;
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const pinprops_t *props = &pin_props[port][pin];
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switch(pcfg->mode){
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case MODE_ANALOG:
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if(!props->vals.canADC) return FALSE;
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pcfg->pull = PULL_NONE; // no PullUp for analog mode
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break;
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case MODE_AF:
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// here af is one of enum FuncValues !!! we should change `af` later
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if(!((1<<pcfg->af) & props->vals.flags)) return FALSE;
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// TODO: set right AF number here !!!
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//if(!(props->AFmask & (1 << pcfg->af))) return FALSE; // no such AF or not supported
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pcfg->speed = SPEED_HIGH; // many AF needs high speed
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pcfg->otype = OUTPUT_PP; // no OD for AF
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break;
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case MODE_INPUT: // no limits
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break;
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case MODE_OUTPUT: // no limits
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break;
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default:
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return FALSE;
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}
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return TRUE;
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}
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int gpio_reinit(){
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for(int port = 0; port < 2; port++){
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GPIO_TypeDef *gpio = (port == 0) ? GPIOA : GPIOB;
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for(int pin = 0; pin < 16; pin++){
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pinconfig_t *cfg = &the_conf.pinconfig[port][pin];
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int shift2 = pin << 1;
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if(!cfg->enable) continue;
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gpio->MODER = (gpio->MODER & ~(3 << shift2))| (cfg->mode << shift2);
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gpio->OTYPER = (gpio->OTYPER & ~(1 << pin)) | (cfg->otype << pin);
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gpio->OSPEEDR = (gpio->OSPEEDR & ~(3 << shift2)) | (cfg->speed << shift2);
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gpio->PUPDR = (gpio->PUPDR & ~(3 << shift2)) | (cfg->pull << shift2);
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if(pin < 8){
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int shift4 = pin << 4;
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gpio->AFR[0] = (gpio->AFR[0] & ~(0xf << shift4)) | (cfg->af << shift4);
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}else{
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int shift4 = (pin - 8) << 4;
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gpio->AFR[1] = (gpio->AFR[1] & ~(0xf << shift4)) | (cfg->af << shift4);
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}
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}
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}
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// TODO: configure USART, SPI etc
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return TRUE;
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}
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