111 lines
3.5 KiB
C
111 lines
3.5 KiB
C
/*
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* The MIT License (MIT)
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*
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* Copyright (c) 2022 Greg Davill
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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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*
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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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* This file is part of the TinyUSB stack.
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*/
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#include "debug_uart.h"
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#include <ch32v30x.h>
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#define UART_RINGBUFFER_SIZE_TX 64
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#define UART_RINGBUFFER_MASK_TX (UART_RINGBUFFER_SIZE_TX-1)
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static char tx_buf[UART_RINGBUFFER_SIZE_TX];
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static unsigned int tx_produce;
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static volatile unsigned int tx_consume;
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void USART1_IRQHandler(void) __attribute__((naked));
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void USART1_IRQHandler(void) {
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__asm volatile ("call USART1_IRQHandler_impl; mret");
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}
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__attribute__((used)) void USART1_IRQHandler_impl(void)
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{
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if(USART_GetITStatus(USART1, USART_IT_TC) != RESET)
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{
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USART_ClearITPendingBit(USART1, USART_IT_TC);
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if(tx_consume != tx_produce) {
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USART_SendData(USART1, tx_buf[tx_consume]);
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tx_consume = (tx_consume + 1) & UART_RINGBUFFER_MASK_TX;
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}
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}
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}
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void uart_write(char c)
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{
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unsigned int tx_produce_next = (tx_produce + 1) & UART_RINGBUFFER_MASK_TX;
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NVIC_DisableIRQ(USART1_IRQn);
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if((tx_consume != tx_produce) || (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET)) {
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tx_buf[tx_produce] = c;
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tx_produce = tx_produce_next;
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} else {
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USART_SendData(USART1, c);
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}
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NVIC_EnableIRQ(USART1_IRQn);
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}
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void uart_sync(void)
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{
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while(tx_consume != tx_produce);
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}
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void usart_printf_init(uint32_t baudrate)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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USART_InitTypeDef USART_InitStructure;
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tx_produce = 0;
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tx_consume = 0;
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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GPIO_Init(GPIOA, &GPIO_InitStructure);
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USART_InitStructure.USART_BaudRate = baudrate;
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USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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USART_InitStructure.USART_StopBits = USART_StopBits_1;
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USART_InitStructure.USART_Parity = USART_Parity_No;
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USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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USART_InitStructure.USART_Mode = USART_Mode_Tx;
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USART_Init(USART1, &USART_InitStructure);
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USART_ITConfig(USART1, USART_IT_TC, ENABLE);
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USART_Cmd(USART1, ENABLE);
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NVIC_InitTypeDef NVIC_InitStructure = { 0 };
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NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init(&NVIC_InitStructure);
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}
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