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/*
* The MIT License (MIT)
*
* Copyright (c) 2022 Greg Davill
*
* 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 "debug_uart.h"
#ifdef __GNUC__
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wstrict-prototypes"
#endif
#include <ch32v30x.h>
#ifdef __GNUC__
#pragma GCC diagnostic pop
#endif
#define UART_RINGBUFFER_SIZE_TX 128
#define UART_RINGBUFFER_MASK_TX (UART_RINGBUFFER_SIZE_TX-1)
static char tx_buf[UART_RINGBUFFER_SIZE_TX];
static unsigned int tx_produce;
static volatile unsigned int tx_consume;
void USART1_IRQHandler(void) __attribute__((naked));
void USART1_IRQHandler(void) {
__asm volatile ("call USART1_IRQHandler_impl; mret");
}
void USART1_IRQHandler_impl(void) __attribute__((used)) ;
void USART1_IRQHandler_impl(void)
{
if(USART_GetITStatus(USART1, USART_IT_TC) != RESET)
{
USART_ClearITPendingBit(USART1, USART_IT_TC);
if(tx_consume != tx_produce) {
USART_SendData(USART1, 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(USART1_IRQn);
if((tx_consume != tx_produce) || (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET)) {
tx_buf[tx_produce] = c;
tx_produce = tx_produce_next;
} else {
USART_SendData(USART1, c);
}
NVIC_EnableIRQ(USART1_IRQn);
}
void uart_sync(void)
{
while(tx_consume != tx_produce);
}
void usart_printf_init(uint32_t baudrate)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
tx_produce = 0;
tx_consume = 0;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_InitStructure.USART_BaudRate = baudrate;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Tx;
USART_Init(USART1, &USART_InitStructure);
USART_ITConfig(USART1, USART_IT_TC, ENABLE);
USART_Cmd(USART1, ENABLE);
NVIC_InitTypeDef NVIC_InitStructure = { 0 };
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
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