148 lines
4.6 KiB
C++
148 lines
4.6 KiB
C++
/******************************************************************************
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* The MIT License
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*
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* Copyright (c) 2010 Perry Hung.
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* Copyright (c) 2011, 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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* @file wirish/HardwareSerial.cpp
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* @brief Wirish serial port implementation.
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*/
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#include "HardwareSerial.h"
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#include <libmaple/libmaple.h>
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#include <libmaple/gpio.h>
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#include <libmaple/timer.h>
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#include <libmaple/usart.h>
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HardwareSerial::HardwareSerial(usart_dev *usart_device,
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uint8 tx_pin,
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uint8 rx_pin) {
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this->usart_device = usart_device;
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this->tx_pin = tx_pin;
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this->rx_pin = rx_pin;
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}
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/*
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* Set up/tear down
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*/
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#if STM32_MCU_SERIES == STM32_SERIES_F1
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/* F1 MCUs have no GPIO_AFR[HL], so turn off PWM if there's a conflict
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* on this GPIO bit. */
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static void disable_timer_if_necessary(timer_dev *dev, uint8 ch) {
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if (dev != NULL) {
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timer_set_mode(dev, ch, TIMER_DISABLED);
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}
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}
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#elif (STM32_MCU_SERIES == STM32_SERIES_F2) || \
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(STM32_MCU_SERIES == STM32_SERIES_F4)
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#define disable_timer_if_necessary(dev, ch) ((void)0)
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#else
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#warning "Unsupported STM32 series; timer conflicts are possible"
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#endif
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void HardwareSerial::begin(uint32 baud)
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{
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begin(baud,SERIAL_8N1);
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}
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/*
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* Roger Clark.
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* Note. The config parameter is not currently used. This is a work in progress.
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* Code needs to be written to set the config of the hardware serial control register in question.
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*
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*/
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void HardwareSerial::begin(uint32 baud, uint8_t config)
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{
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// ASSERT(baud <= this->usart_device->max_baud);// Roger Clark. Assert doesn't do anything useful, we may as well save the space in flash and ram etc
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if (baud > this->usart_device->max_baud) {
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return;
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}
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const stm32_pin_info *txi = &PIN_MAP[this->tx_pin];
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const stm32_pin_info *rxi = &PIN_MAP[this->rx_pin];
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disable_timer_if_necessary(txi->timer_device, txi->timer_channel);
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usart_init(this->usart_device);
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usart_config_gpios_async(this->usart_device,
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rxi->gpio_device, rxi->gpio_bit,
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txi->gpio_device, txi->gpio_bit,
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config);
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usart_set_baud_rate(this->usart_device, USART_USE_PCLK, baud);
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usart_enable(this->usart_device);
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}
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void HardwareSerial::end(void) {
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usart_disable(this->usart_device);
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}
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/*
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* I/O
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*/
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int HardwareSerial::read(void) {
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if(usart_data_available(usart_device) > 0) {
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return usart_getc(usart_device);
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} else {
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return -1;
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}
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}
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int HardwareSerial::available(void) {
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return usart_data_available(this->usart_device);
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}
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/* Roger Clark. Added function missing from LibMaple code */
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int HardwareSerial::peek(void)
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{
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return usart_peek(this->usart_device);
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}
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int HardwareSerial::availableForWrite(void)
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{
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/* Roger Clark.
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* Currently there isn't an output ring buffer, chars are sent straight to the hardware.
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* so just return 1, meaning that 1 char can be written
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* This will be slower than a ring buffer implementation, but it should at least work !
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*/
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return 1;
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}
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size_t HardwareSerial::write(unsigned char ch) {
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usart_putc(this->usart_device, ch);
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return 1;
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}
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/* edogaldo: Waits for the transmission of outgoing serial data to complete (Arduino 1.0 api specs) */
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void HardwareSerial::flush(void) {
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while(!rb_is_empty(this->usart_device->wb)); // wait for TX buffer empty
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while(!((this->usart_device->regs->SR) & (1<<USART_SR_TC_BIT))); // wait for TC (Transmission Complete) flag set
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}
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