gpio.c ( File view )

  • By gregkam 2014-10-06
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  • Download(s):1
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			/*
 * gpio.c --- STM32F4 GPIO driver.
 *
 * Copyright (C) 2012, Galois, Inc.
 * All Rights Reserved.
 *
 * This software is released under the "BSD3" license.  Read the file
 * "LICENSE" for more information.
 */

#include <stm32f4xx.h>

#include "hwf4/rcc.h"
#include "hwf4/gpio.h"


/* External GPIO Interface ****************************************************/

struct gpio {

    GPIO_TypeDef *dev;
    enum RCCDevice rcc_dev;

};


void gpio_enable(struct gpio *gpio) {

    rcc_enable(gpio->rcc_dev);

}

void gpio_reset_moder(struct gpio *gpio, uint32_t val) {

    gpio->dev->MODER &= ~val;

}

void gpio_update_moder(struct gpio *gpio, uint32_t val) {

    gpio->dev->MODER |= val;

}

void gpio_reset_otyper(struct gpio *gpio, uint32_t val) {

    gpio->dev->OTYPER &= ~val;

}

void gpio_update_otyper(struct gpio *gpio, uint32_t val) {

    gpio->dev->OTYPER |= val;

}

void gpio_reset_ospeedr(struct gpio *gpio, uint32_t val) {

    gpio->dev->OSPEEDR &= ~val;

}

void gpio_update_ospeedr(struct gpio *gpio, uint32_t val) {

    gpio->dev->OSPEEDR |= val;

}

void gpio_reset_pupdr(struct gpio *gpio, uint32_t val) {

    gpio->dev->PUPDR &= ~val;

}

void gpio_update_pupdr(struct gpio *gpio, uint32_t val) {

    gpio->dev->PUPDR |= val;

}

uint32_t gpio_get_idr(struct gpio *gpio) {

    return gpio->dev->IDR;

}

void gpio_modify_odr(struct gpio *gpio, uint32_t val) {

    gpio->dev->ODR |= val;

}

void gpio_reset_afr(struct gpio *gpio, int lh, uint32_t val) {

    gpio->dev->AFR[lh] &= ~val;

}

void gpio_modify_afr(struct gpio *gpio, int lh, uint32_t val) {

    gpio->dev->AFR[lh] |= val;

}

void gpio_set_bsrrl(struct gpio *gpio, uint32_t val) {

    gpio->dev->BSRRL = val;

}

void gpio_set_bsrrh(struct gpio *gpio, uint32_t val) {

    gpio->dev->BSRRH = val;

}



/* External GPIO Pin Interface ************************************************/

struct pin {

    struct gpio *bank;
    uint8_t pin_num;

};

void pin_enable(struct pin *pin) {

    gpio_enable(pin->bank);

}

void pin_set_mode(struct pin *pin, enum pin_mode mode) {

    gpio_reset_moder(pin->bank, GPIO_MODER_MODER0 << (pin->pin_num * 2));

    uint32_t mask = (uint32_t)mode << (pin->pin_num * 2);
    gpio_update_moder(pin->bank, mask);

}

void pin_set_otype(struct pin *pin, enum pin_type type) {

    gpio_reset_otyper(pin->bank, GPIO_OTYPER_OT_0 << pin->pin_num);

    uint32_t mask = (uint32_t)type << pin->pin_num;
    gpio_update_otyper(pin->bank, mask);

}

void pin_set_ospeed(struct pin *pin, enum pin_speed speed) {

    gpio_reset_ospeedr(pin->bank, GPIO_OSPEEDER_OSPEEDR0 << (pin->pin_num * 2));

    uint32_t mask = (uint32_t)speed << (pin->pin_num * 2);
    gpio_update_ospeedr(pin->bank, mask);

}

void pin_set_pupd(struct pin *pin, enum pin_pupd pupd) {

    gpio_reset_pupdr(pin->bank, GPIO_PUPDR_PUPDR0 << pin->pin_num);

    uint32_t mask = (uint32_t)pupd << pin->pin_num;
    gpio_update_pupdr(pin->bank, mask);

}

void pin_set_af(struct pin *pin, enum pin_af af) {

    int reg = (pin->pin_num & 0x7) * 4;    // [0,7]
    int lh  = (pin->pin_num >> 0x3) & 0x1; // [0,1]

    gpio_reset_afr(pin->bank, lh, 0xf << reg);

    uint32_t mask = ((uint32_t)af & 0xf) << reg;
    gpio_modify_afr(pin->bank, lh, mask);

}


void pin_reset(struct pin *pin) {

    gpio_set_bsrrh(pin->bank, 0x1 << pin->pin_num);

}

void pin_set(struct pin *pin) {

    gpio_set_bsrrl(pin->bank, 0x1 << pin->pin_num);

}

void pin_toggle(struct pin *pin) {

    uint16_t odr = pin->bank->dev->ODR;

    if (odr & (1 << pin->pin_num))
       
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