cd494c17d9
Pull some code out of the F2 pinMode() into a utility function. This feels generally useful enough to be exposed to the users (it will, for example, make it easier to implement input capture in a clean way). Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
100 lines
3.1 KiB
C++
100 lines
3.1 KiB
C++
/******************************************************************************
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* The MIT License
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*
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* Copyright (c) 2012 LeafLabs, LLC.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*****************************************************************************/
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/*
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* STM32F2 implementations for basic GPIO functionality.
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*/
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#include <wirish/io.h>
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#include <libmaple/gpio.h>
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#include <libmaple/timer.h>
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#include <wirish/boards.h>
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void pinMode(uint8 pin, WiringPinMode w_mode) {
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if (pin >= BOARD_NR_GPIO_PINS) {
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return;
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}
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gpio_pin_mode mode;
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// People always do the silly pin-toggle speed benchmark, so let's
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// accomodate them:
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unsigned flags = GPIO_MODEF_SPEED_HIGH;
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bool pwm = false;
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switch(w_mode) {
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case OUTPUT:
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mode = GPIO_MODE_OUTPUT;
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break;
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case OUTPUT_OPEN_DRAIN:
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mode = GPIO_MODE_OUTPUT;
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flags |= GPIO_MODEF_TYPE_OD;
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break;
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case INPUT:
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case INPUT_FLOATING:
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mode = GPIO_MODE_INPUT;
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break;
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case INPUT_ANALOG:
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mode = GPIO_MODE_ANALOG;
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break;
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case INPUT_PULLUP:
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mode = GPIO_MODE_INPUT;
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flags |= GPIO_MODEF_PUPD_PU;
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break;
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case INPUT_PULLDOWN:
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mode = GPIO_MODE_INPUT;
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flags |= GPIO_MODEF_PUPD_PD;
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break;
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case PWM:
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mode = GPIO_MODE_AF;
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pwm = true;
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break;
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case PWM_OPEN_DRAIN:
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mode = GPIO_MODE_AF;
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flags |= GPIO_MODEF_TYPE_OD;
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pwm = true;
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break;
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default:
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ASSERT(0); // Can't happen
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return;
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}
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const stm32_pin_info *info = &PIN_MAP[pin];
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if (pwm) {
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/* If enabling PWM, tell the timer to do PWM, and tell the pin
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* to listen to the right timer. */
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ASSERT(info->timer_device != NULL);
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if (info->timer_device == NULL) {
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return;
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}
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gpio_af timer_af = timer_get_af(info->timer_device);
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timer_set_mode(info->timer_device, info->timer_channel, TIMER_PWM);
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gpio_set_af(info->gpio_device, info->gpio_bit, timer_af);
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}
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gpio_set_modef(info->gpio_device, info->gpio_bit, mode, flags);
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}
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