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/******************************************************************************
* The MIT License
*
* Copyright (c) 2010 Perry Hung.
* Copyright (c) 2011, 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.
*****************************************************************************/
/**
* @file wirish/HardwareSerial.cpp
* @brief Wirish serial port implementation.
*/
#include <wirish/HardwareSerial.h>
#include <libmaple/libmaple.h>
#include <libmaple/gpio.h>
#include <libmaple/timer.h>
#include <libmaple/usart.h>
#define DEFINE_HWSERIAL(name, n) \
HardwareSerial name(USART##n, \
BOARD_USART##n##_TX_PIN, \
BOARD_USART##n##_RX_PIN)
#if BOARD_HAVE_USART1
DEFINE_HWSERIAL(Serial1, 1);
#endif
#if BOARD_HAVE_USART2
DEFINE_HWSERIAL(Serial2, 2);
#endif
#if BOARD_HAVE_USART3
DEFINE_HWSERIAL(Serial3, 3);
#endif
#if BOARD_HAVE_UART4
DEFINE_HWSERIAL(Serial4, 4);
#endif
#if BOARD_HAVE_UART5
DEFINE_HWSERIAL(Serial5, 5);
#endif
#if BOARD_HAVE_USART6
DEFINE_HWSERIAL(Serial6, 6);
#endif
HardwareSerial::HardwareSerial(usart_dev *usart_device,
uint8 tx_pin,
uint8 rx_pin) {
this->usart_device = usart_device;
this->tx_pin = tx_pin;
this->rx_pin = rx_pin;
}
/*
* Set up/tear down
*/
#if STM32_MCU_SERIES == STM32_SERIES_F1
/* F1 MCUs have no GPIO_AFR[HL], so turn off PWM if there's a conflict
* on this GPIO bit. */
static void disable_timer_if_necessary(timer_dev *dev, uint8 ch) {
if (dev != NULL) {
timer_set_mode(dev, ch, TIMER_DISABLED);
}
}
#elif (STM32_MCU_SERIES == STM32_SERIES_F2) || \
(STM32_MCU_SERIES == STM32_SERIES_F4)
#define disable_timer_if_necessary(dev, ch) ((void)0)
#else
#warning "Unsupported STM32 series; timer conflicts are possible"
#endif
void HardwareSerial::begin(uint32 baud) {
ASSERT(baud <= this->usart_device->max_baud);
if (baud > this->usart_device->max_baud) {
return;
}
const stm32_pin_info *txi = &PIN_MAP[this->tx_pin];
const stm32_pin_info *rxi = &PIN_MAP[this->rx_pin];
disable_timer_if_necessary(txi->timer_device, txi->timer_channel);
usart_config_gpios_async(this->usart_device,
rxi->gpio_device, rxi->gpio_bit,
txi->gpio_device, txi->gpio_bit,
0);
usart_init(this->usart_device);
usart_set_baud_rate(this->usart_device, USART_USE_PCLK, baud);
usart_enable(this->usart_device);
}
void HardwareSerial::end(void) {
usart_disable(this->usart_device);
}
/*
* I/O
*/
uint8 HardwareSerial::read(void) {
return usart_getc(this->usart_device);
}
uint32 HardwareSerial::available(void) {
return usart_data_available(this->usart_device);
}
void HardwareSerial::write(unsigned char ch) {
usart_putc(this->usart_device, ch);
}
void HardwareSerial::flush(void) {
usart_reset_rx(this->usart_device);
}
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