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/*
* The MIT License (MIT)
*
* Copyright (c) 2023 Denis Krasutski
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* This file is part of the TinyUSB stack.
*/
#include <ch32f20x.h>
#include "board.h"
#include "debug_uart.h"
#define UART_RINGBUFFER_SIZE_TX 64
#define UART_RINGBUFFER_MASK_TX (UART_RINGBUFFER_SIZE_TX-1)
static char tx_buf[UART_RINGBUFFER_SIZE_TX];
static unsigned int tx_produce = 0;
static volatile unsigned int tx_consume = 0;
void UART_DEV_IRQHandler(void)
{
if(USART_GetITStatus(UART_DEV, USART_IT_TC) != RESET) {
USART_ClearITPendingBit(UART_DEV, USART_IT_TC);
if(tx_consume != tx_produce) {
USART_SendData(UART_DEV, tx_buf[tx_consume]);
tx_consume = (tx_consume + 1) & UART_RINGBUFFER_MASK_TX;
}
}
}
void uart_write(char c)
{
unsigned int tx_produce_next = (tx_produce + 1) & UART_RINGBUFFER_MASK_TX;
NVIC_DisableIRQ(UART_DEV_IRQn);
if((tx_consume != tx_produce) || (USART_GetFlagStatus(UART_DEV, USART_FLAG_TXE) == RESET)) {
tx_buf[tx_produce] = c;
tx_produce = tx_produce_next;
} else {
USART_SendData(UART_DEV, c);
}
NVIC_EnableIRQ(UART_DEV_IRQn);
}
void uart_sync(void)
{
while(tx_consume != tx_produce) {
//Waiting for transfer complete
}
}
void usart_printf_init(uint32_t baudrate)
{
tx_produce = 0;
tx_consume = 0;
UART_DEV_CLK_EN();
GPIO_InitTypeDef gpio_config = {
.GPIO_Pin = UART_DEV_TX_PIN,
.GPIO_Speed = GPIO_Speed_50MHz,
.GPIO_Mode = GPIO_Mode_AF_PP,
};
GPIO_Init(UART_DEV_GPIO_PORT, &gpio_config);
USART_InitTypeDef uart_config = {
.USART_BaudRate = baudrate,
.USART_WordLength = USART_WordLength_8b,
.USART_StopBits = USART_StopBits_1,
.USART_Parity = USART_Parity_No,
.USART_HardwareFlowControl = USART_HardwareFlowControl_None,
.USART_Mode = USART_Mode_Tx,
};
USART_Init(UART_DEV, &uart_config);
USART_ITConfig(UART_DEV, USART_IT_TC, ENABLE);
USART_Cmd(UART_DEV, ENABLE);
NVIC_InitTypeDef nvic_config = {
.NVIC_IRQChannel = UART_DEV_IRQn,
.NVIC_IRQChannelPreemptionPriority = 1,
.NVIC_IRQChannelSubPriority = 3,
.NVIC_IRQChannelCmd = ENABLE,
};
NVIC_Init(&nvic_config);
}
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