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/*
* Copyright (c) 2012 Travis Geiselbrecht
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <debug.h>
#include <assert.h>
#include <dev/gpio.h>
#include <platform/stm32.h>
#include <platform/gpio.h>
#include <stm32f4xx_gpio.h>
#include <stm32f4xx_rcc.h>
static GPIO_TypeDef *port_to_pointer(unsigned int port)
{
switch (port) {
default:
case GPIO_PORT_A:
return GPIOA;
case GPIO_PORT_B:
return GPIOB;
case GPIO_PORT_C:
return GPIOC;
case GPIO_PORT_D:
return GPIOD;
case GPIO_PORT_E:
return GPIOE;
case GPIO_PORT_F:
return GPIOF;
case GPIO_PORT_G:
return GPIOG;
case GPIO_PORT_H:
return GPIOH;
case GPIO_PORT_I:
return GPIOI;
}
}
static void enable_port(unsigned int port)
{
DEBUG_ASSERT(port <= GPIO_PORT_I);
/* happens to be the RCC ids are sequential bits, so we can start from A and shift */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA << port, ENABLE);
}
void stm32_gpio_early_init(void)
{
}
int gpio_config(unsigned nr, unsigned flags)
{
uint port = GPIO_PORT(nr);
uint pin = GPIO_PIN(nr);
enable_port(port);
GPIO_InitTypeDef init;
init.GPIO_Speed = GPIO_Speed_50MHz;
init.GPIO_Pin = (1 << pin);
init.GPIO_PuPd = GPIO_PuPd_NOPULL;
if (flags & GPIO_INPUT) {
init.GPIO_Mode = GPIO_Mode_IN;
} else if (flags & GPIO_OUTPUT) {
init.GPIO_Mode = GPIO_Mode_OUT;
} else if (flags & GPIO_STM32_AF) {
init.GPIO_Mode = GPIO_Mode_AF;
GPIO_PinAFConfig(port_to_pointer(port), pin, GPIO_AFNUM(flags));
}
if (flags & GPIO_PULLUP) {
init.GPIO_PuPd = GPIO_PuPd_UP;
} else if (flags & GPIO_PULLDOWN) {
init.GPIO_PuPd = GPIO_PuPd_DOWN;
}
if (flags & GPIO_STM32_OD) {
init.GPIO_OType = GPIO_OType_OD;
} else {
init.GPIO_OType = GPIO_OType_PP;
}
GPIO_Init(port_to_pointer(port), &init);
return 0;
}
void gpio_set(unsigned nr, unsigned on)
{
GPIO_WriteBit(port_to_pointer(GPIO_PORT(nr)), 1 << GPIO_PIN(nr), on);
}
int gpio_get(unsigned nr)
{
return GPIO_ReadInputDataBit(port_to_pointer(GPIO_PORT(nr)), 1 << GPIO_PIN(nr));
}
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