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/******************************************************************************
* The MIT License
*
* Copyright (c) 2012 LeafLabs, LLC.
*
* 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.
*****************************************************************************/
/*
* STM32F2 implementations for basic GPIO functionality.
*/
#include <wirish/io.h>
#include <libmaple/gpio.h>
#include <libmaple/timer.h>
#include <wirish/boards.h>
void pinMode(uint8 pin, WiringPinMode w_mode) {
if (pin >= BOARD_NR_GPIO_PINS) {
return;
}
gpio_pin_mode mode;
// People always do the silly pin-toggle speed benchmark, so let's
// accomodate them:
unsigned flags = GPIO_MODEF_SPEED_HIGH;
bool pwm = false;
switch(w_mode) {
case OUTPUT:
mode = GPIO_MODE_OUTPUT;
break;
case OUTPUT_OPEN_DRAIN:
mode = GPIO_MODE_OUTPUT;
flags |= GPIO_MODEF_TYPE_OD;
break;
case INPUT:
case INPUT_FLOATING:
mode = GPIO_MODE_INPUT;
break;
case INPUT_ANALOG:
mode = GPIO_MODE_ANALOG;
break;
case INPUT_PULLUP:
mode = GPIO_MODE_INPUT;
flags |= GPIO_MODEF_PUPD_PU;
break;
case INPUT_PULLDOWN:
mode = GPIO_MODE_INPUT;
flags |= GPIO_MODEF_PUPD_PD;
break;
case PWM:
mode = GPIO_MODE_AF;
pwm = true;
break;
case PWM_OPEN_DRAIN:
mode = GPIO_MODE_AF;
flags |= GPIO_MODEF_TYPE_OD;
pwm = true;
break;
default:
ASSERT(0); // Can't happen
return;
}
const stm32_pin_info *info = &PIN_MAP[pin];
if (pwm) {
/* If enabling PWM, tell the timer to do PWM, and tell the pin
* to listen to the right timer. */
ASSERT(info->timer_device != NULL);
if (info->timer_device == NULL) {
return;
}
gpio_af timer_af;
/* TODO make this code a <libmaple/timer.h> convenience
* routine for series that support GPIO alternate
* functions. */
switch(info->timer_device->clk_id) {
case RCC_TIMER1: // fall-through
case RCC_TIMER2:
timer_af = GPIO_AF_TIM_1_2;
break;
case RCC_TIMER3: // fall-through
case RCC_TIMER4: // ...
case RCC_TIMER5:
timer_af = GPIO_AF_TIM_3_4_5;
break;
/* Timers 6 and 7 don't have any capture/compare, so they
* can't do PWM (and in fact have no AF values). */
case RCC_TIMER8: // fall-through
case RCC_TIMER9: // ...
case RCC_TIMER10: // ...
case RCC_TIMER11:
timer_af = GPIO_AF_TIM_8_9_10_11;
break;
case RCC_TIMER12: // fall-through
case RCC_TIMER13: // ...
case RCC_TIMER14:
timer_af = GPIO_AF_CAN_1_2_TIM_12_13_14;
break;
default:
ASSERT(0); // Can't happen
return;
}
timer_set_mode(info->timer_device, info->timer_channel, TIMER_PWM);
gpio_set_af(info->gpio_device, info->gpio_bit, timer_af);
} else {
gpio_set_modef(info->gpio_device, info->gpio_bit, mode, flags);
}
}
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