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/**
* @file gpio.c
* Abstracts gpio access, makes things easier
*
* Copyright (C) 2018 Clyne Sullivan
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "gpio.h"
static GPIO_TypeDef *gpio_ports[8] = {
GPIOA, GPIOB, GPIOC, GPIOD,
GPIOE, GPIOF, GPIOG, GPIOH
};
void gpio_svc(uint32_t n, uint32_t *ret, uint32_t *args)
{
GPIO_TypeDef *port = gpio_ports[args[0] >> 4];
uint32_t pin = args[0] & 0xF;
switch (n) {
case 0:
gpio_mode(port, pin, args[1]);
break;
case 1:
gpio_type(port, pin, args[1]);
break;
case 2:
gpio_pupd(port, pin, args[1]);
break;
case 3:
gpio_speed(port, pin, args[1]);
break;
case 4:
gpio_dout(port, pin, args[1]);
break;
case 5:
*((int *)ret) = gpio_din(port, pin);
break;
}
}
void gpio_init(void)
{
// enable clocks
RCC->AHB2ENR |= 0x0F;
}
void gpio_pupd(GPIO_TypeDef *port, uint32_t pin, uint32_t pupd)
{
port->PUPDR &= ~(0x03 << (2 * pin));
port->PUPDR |= pupd << (2 * pin);
}
void gpio_speed(GPIO_TypeDef *port, uint32_t pin, uint32_t speed)
{
port->OSPEEDR &= ~(0x03 << (2 * pin));
port->OSPEEDR |= speed << (2 * pin);
}
void gpio_type(GPIO_TypeDef *port, uint32_t pin, uint32_t type)
{
port->OTYPER &= ~(1 << pin);
port->OTYPER |= type << pin;
}
void gpio_mode(GPIO_TypeDef *port, uint32_t pin, uint32_t mode)
{
port->MODER &= ~(0x03 << (2 * pin));
port->MODER |= mode << (2 * pin);
}
void gpio_dout(GPIO_TypeDef *port, uint32_t pin, uint32_t val)
{
port->BSRR |= (1 << (val ? pin : pin + 16));
}
uint32_t gpio_din(GPIO_TypeDef *port, uint32_t pin)
{
return port->IDR & (1 << pin);
}
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