77 lines
2.1 KiB
C++
77 lines
2.1 KiB
C++
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/**
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* @file usart0.cpp
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* @brief USART0 串口模块实现与 printf 重定向。
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*/
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#include "main.h"
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#include "device/usart0.h"
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#include "sys/config.h"
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uint8_t Usart0::s_txBuf[Usart0::kTxBufSize];
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volatile uint16_t Usart0::s_txHead = 0U;
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volatile uint16_t Usart0::s_txTail = 0U;
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uint16_t Usart0::nextIndex(uint16_t idx)
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{
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return (idx + 1U) % kTxBufSize;
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}
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bool Usart0::isBufferFull()
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{
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return nextIndex(s_txHead) == s_txTail;
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}
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bool Usart0::isBufferEmpty()
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{
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return s_txHead == s_txTail;
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}
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int Usart0::putChar(int ch, FILE *f)
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{
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(void)f;
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uint16_t next = nextIndex(s_txHead);
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while(next == s_txTail) { /* 缓冲满，忙等重试 */ }
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s_txBuf[s_txHead] = static_cast<uint8_t>(ch);
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s_txHead = next;
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usart_interrupt_enable(USART0, USART_INT_TBE);
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return ch;
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}
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void Usart0::onInterrupt()
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{
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if(usart_interrupt_flag_get(USART0, USART_INT_FLAG_TBE) != RESET) {
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if(!isBufferEmpty()) {
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usart_data_transmit(USART0, s_txBuf[s_txTail]);
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s_txTail = nextIndex(s_txTail);
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}
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if(isBufferEmpty()) {
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usart_interrupt_disable(USART0, USART_INT_TBE);
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}
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}
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}
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void Usart0::configurePins()
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{
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rcu_periph_clock_enable(RCU_GPIOA);
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gpio_init(GPIOA, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_9);
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gpio_init(GPIOA, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_50MHZ, GPIO_PIN_10);
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}
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void Usart0::init()
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{
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rcu_periph_clock_enable(RCU_USART0);
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usart_deinit(USART0);
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usart_baudrate_set(USART0, CONFIG_USART0_BAUDRATE);
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usart_word_length_set(USART0, USART_WL_8BIT);
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usart_stop_bit_set(USART0, USART_STB_1BIT);
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usart_parity_config(USART0, USART_PM_NONE);
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usart_receive_config(USART0, USART_RECEIVE_ENABLE);
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usart_transmit_config(USART0, USART_TRANSMIT_ENABLE);
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usart_enable(USART0);
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nvic_irq_enable(USART0_IRQn, 2U, 0U);
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}
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/* ----- 中断入口 / printf 重定向的 C 包装 --------------------------- */
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extern "C" int fputc(int ch, FILE *f) { return Usart0::putChar(ch, f); }
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extern "C" void USART0_IRQHandler(void) { Usart0::onInterrupt(); }
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