External serial driver moved to a separate driver
This commit is contained in:
Raphael Coeffic
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/*
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* Copyright (C) EdgeTX
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*
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* Based on code named
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* opentx - https://github.com/opentx/opentx
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* th9x - http://code.google.com/p/th9x
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* er9x - http://code.google.com/p/er9x
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* gruvin9x - http://code.google.com/p/gruvin9x
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*
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* License GPLv2: http://www.gnu.org/licenses/gpl-2.0.html
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include "hal/serial_driver.h"
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#include "board.h"
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#if defined(EXTMODULE_USART)
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#include "stm32_usart_driver.h"
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#include "io/frsky_pxx2.h"
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ModuleFifo extmoduleFifo;
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struct etx_serial_callbacks_t {
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void (*on_receive)(uint8_t data);
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void (*on_error)();
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};
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static etx_serial_callbacks_t extmodule_driver = { nullptr, nullptr };
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void extmoduleFifoReceive(uint8_t data)
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{
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extmoduleFifo.push(data);
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}
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void extmoduleFifoError()
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{
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extmoduleFifo.errors++;
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}
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static const etx_serial_init extmoduleSerialParams = {
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.baudrate = 0,
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.parity = ETX_Parity_None,
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.stop_bits = ETX_StopBits_One,
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.word_length = ETX_WordLength_8,
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.rx_enable = true,
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.on_receive = extmoduleFifoReceive,
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.on_error = extmoduleFifoError,
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};
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static void extmoduleSerialStart(const etx_serial_init* params)
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{
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if (!params) return;
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extmodule_driver.on_receive = params->on_receive;
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extmodule_driver.on_error = params->on_error;
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// TX + RX Pins
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GPIO_PinAFConfig(EXTMODULE_USART_GPIO, EXTMODULE_TX_GPIO_PinSource,
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EXTMODULE_USART_GPIO_AF);
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GPIO_PinAFConfig(EXTMODULE_USART_GPIO, EXTMODULE_RX_GPIO_PinSource,
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EXTMODULE_USART_GPIO_AF);
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GPIO_InitTypeDef GPIO_InitStructure;
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GPIO_InitStructure.GPIO_Pin = EXTMODULE_TX_GPIO_PIN | EXTMODULE_RX_GPIO_PIN;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
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GPIO_Init(EXTMODULE_USART_GPIO, &GPIO_InitStructure);
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// UART config
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stm32_usart_init(EXTMODULE_USART, params);
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extmoduleFifo.clear();
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USART_ITConfig(EXTMODULE_USART, USART_IT_RXNE, ENABLE);
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NVIC_SetPriority(EXTMODULE_USART_IRQn, 6);
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NVIC_EnableIRQ(EXTMODULE_USART_IRQn);
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}
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void extmoduleInvertedSerialStart(uint32_t baudrate)
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{
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EXTERNAL_MODULE_ON();
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etx_serial_init params(extmoduleSerialParams);
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params.baudrate = baudrate;
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extmoduleSerialStart(¶ms);
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}
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void extmoduleSerialStop()
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{
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DMA_DeInit(EXTMODULE_USART_TX_DMA_STREAM);
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GPIO_InitTypeDef GPIO_InitStructure;
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GPIO_InitStructure.GPIO_Pin = EXTMODULE_TX_GPIO_PIN | EXTMODULE_RX_GPIO_PIN;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
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GPIO_Init(EXTMODULE_USART_GPIO, &GPIO_InitStructure);
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USART_DeInit(EXTMODULE_USART);
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GPIO_ResetBits(EXTMODULE_USART_GPIO, EXTMODULE_TX_GPIO_PIN | EXTMODULE_RX_GPIO_PIN);
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// reset callbacks
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extmodule_driver.on_receive = nullptr;
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extmodule_driver.on_error = nullptr;
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}
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static void extmoduleSendByte(uint8_t byte)
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{
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while (!(EXTMODULE_USART->SR & USART_SR_TXE));
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USART_SendData(EXTMODULE_USART, byte);
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}
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static void extmoduleSendBuffer(const uint8_t * data, uint8_t size)
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{
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if (size == 0)
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return;
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DMA_InitTypeDef DMA_InitStructure;
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DMA_DeInit(EXTMODULE_USART_TX_DMA_STREAM);
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DMA_InitStructure.DMA_Channel = EXTMODULE_USART_TX_DMA_CHANNEL;
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DMA_InitStructure.DMA_PeripheralBaseAddr = CONVERT_PTR_UINT(&EXTMODULE_USART->DR);
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DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
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DMA_InitStructure.DMA_Memory0BaseAddr = CONVERT_PTR_UINT(data);
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DMA_InitStructure.DMA_BufferSize = size;
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DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
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DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
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DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
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DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
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DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
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DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
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DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
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DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
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DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
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DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
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DMA_Init(EXTMODULE_USART_TX_DMA_STREAM, &DMA_InitStructure);
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DMA_Cmd(EXTMODULE_USART_TX_DMA_STREAM, ENABLE);
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USART_DMACmd(EXTMODULE_USART, USART_DMAReq_Tx, ENABLE);
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}
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#define USART_FLAG_ERRORS (USART_FLAG_ORE | USART_FLAG_NE | USART_FLAG_FE | USART_FLAG_PE)
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extern "C" void EXTMODULE_USART_IRQHandler(void)
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{
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// No ISR based send loop: DMA only
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// Receive
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uint32_t status = EXTMODULE_USART->SR;
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while (status & (USART_FLAG_RXNE | USART_FLAG_ERRORS)) {
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uint8_t data = EXTMODULE_USART->DR;
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if (status & USART_FLAG_ERRORS) {
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if (extmodule_driver.on_error)
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extmodule_driver.on_error();
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}
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else {
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if (extmodule_driver.on_receive)
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extmodule_driver.on_receive(data);
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}
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status = EXTMODULE_USART->SR;
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}
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}
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static void extmoduleWaitForTxCompleted()
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{
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#if !defined(SIMU)
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// TODO: check if everything is properly initialised, this seems to block when
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// the port has been initialised with a zero baudrate
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if (DMA_GetCmdStatus(EXTMODULE_USART_TX_DMA_STREAM) == ENABLE) {
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while (DMA_GetFlagStatus(EXTMODULE_USART_TX_DMA_STREAM,
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EXTMODULE_USART_TX_DMA_FLAG_TC) == RESET)
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;
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DMA_ClearFlag(EXTMODULE_USART_TX_DMA_STREAM,
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EXTMODULE_USART_TX_DMA_FLAG_TC);
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}
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#endif
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}
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etx_serial_driver_t ExtmoduleSerialDriver = {
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.init = extmoduleSerialStart,
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.deinit = extmoduleSerialStop,
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.sendByte = extmoduleSendByte,
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.sendBuffer = extmoduleSendBuffer,
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.waitForTxCompleted = extmoduleWaitForTxCompleted,
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};
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#endif // defined(EXTMODULE_USART)
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