96 lines
2.9 KiB
C++
96 lines
2.9 KiB
C++
/*
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* Copyright (C) 2019 Max Regan
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies 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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* The above copyright notice and this permission notice shall be included in
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* 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, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "Bsp/Drivers/UsartDriver.h"
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#include "Bsp/macros.h"
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namespace BSP {
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using RC = BSP::ReturnCode;
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using BSP::Schedule::TaskScheduler;
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using BSP::Schedule::NextTime;
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using BSP::Time;
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UsartDriver::UsartDriver(USART_TypeDef *usart, TaskScheduler &scheduler)
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: m_scheduler(scheduler)
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, m_usart(usart)
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{}
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void UsartDriver::init()
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{
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// TODO: This is all hardcoded for USART1 (doesn't exist on STM32L031)
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#if defined(STM32L0XX)
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if (m_usart == USART2) {
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RCC->APB1ENR |= RCC_APB1ENR_USART2EN;
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}
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#elif defined(STM32L4XX)
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if (m_usart == USART1) {
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RCC->APB2ENR |= RCC_APB2ENR_USART1EN;
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} else if (m_usart == USART2) {
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RCC->APB1ENR1 |= RCC_APB1ENR1_USART2EN;
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} else if (m_usart == USART3) {
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RCC->APB1ENR1 |= RCC_APB1ENR1_USART3EN;
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}
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#else
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#error "Unknown device family"
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#endif
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// Set TX (PA9) to output, push/pull
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SET_TO(GPIOA->AFR[1], GPIO_AFRH_AFSEL9, 7u << GPIO_AFRH_AFSEL9_Pos); //AF7 (USART1_TX)
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SET_TO(GPIOA->MODER, GPIO_MODER_MODE9, 2u << GPIO_MODER_MODE9_Pos); // Alternate Function
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GPIOA->OTYPER &= ~GPIO_OTYPER_OT_9; // push/pull
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GPIOA->PUPDR &= ~GPIO_PUPDR_PUPD9; // no pullup, no pulldown
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m_usart->BRR = (4100000) /115200L; // set baudrate (APBCLK / baud)
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m_usart->CR1 |= (USART_CR1_RE | USART_CR1_TE); // RX, TX enable
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m_usart->CR1 |= USART_CR1_UE; // USART enable
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}
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NextTime UsartDriver::execute()
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{
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return NextTime::never();
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}
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RC UsartDriver::tx_blocking(const uint8_t *data, size_t len)
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{
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for (size_t i = 0; i < len; i++) {
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while (!(m_usart->ISR & USART_ISR_TXE)) {}
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m_usart->TDR = data[i];
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}
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return RC::OK;
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}
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RC UsartDriver::tx_blocking(const char *data)
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{
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size_t len = 0;
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while (data[len] != '\0') {
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len++;
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};
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return tx_blocking(reinterpret_cast<const uint8_t *>(data), len);
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}
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}
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