177 lines
4.5 KiB
C
177 lines
4.5 KiB
C
#include "sys.h"
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#include "usart.h"
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/*********************************************************************************
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___ _ _____ _____ _ _ _____ _____ _ __
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/ _ \ | | |_ _|| ___|| \ | ||_ _|| ___|| | / /
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/ /_\ \| | | | | |__ | \| | | | | |__ | |/ /
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| _ || | | | | __| | . ` | | | | __| | \
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| | | || |_____| |_ | |___ | |\ | | | | |___ | |\ \
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\_| |_/\_____/\___/ \____/ \_| \_/ \_/ \____/ \_| \_/
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* ******************************************************************************
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* 本程序只供学习使用，未经作者许可，不得用于其它任何用途
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* ALIENTEK W601开发板
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* 串口0初始化
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* 正点原子@ALIENTEK
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* 技术论坛:www.openedv.com
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* 创建日期:2019/7/10
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* 版本：V1.0
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* 版权所有，盗版必究。
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* Copyright(C) 广州市星翼电子科技有限公司 2019-2029
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* All rights reserved
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* ******************************************************************************
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* 修改说明
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* ******************************************************************************/
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//////////////////////////////////////////////////////////////
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//加入以下代码,支持printf函数,而不需要选择use MicroLIB
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#if 1
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#pragma import(__use_no_semihosting)
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//标准库需要的支持函数
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struct __FILE
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{
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int handle;
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};
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FILE __stdout;
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/**
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* @brief 定义_sys_exit()以避免使用半主机模式
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*
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* @param void
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*
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* @return void
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*/
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void _sys_exit(int x)
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{
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x = x;
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}
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/**
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* @brief 重定义fputc函数
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*
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* @param ch 输出字符量
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* @param f 文件指针
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*
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* @return void
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*/
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int fputc(int ch, FILE *f)
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{
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while(tls_reg_read32(HR_UART0_FIFO_STATUS) & 0x3F); //等待发送完毕
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tls_reg_write32(HR_UART0_TX_WIN, (u8) ch);
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return ch;
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}
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#endif
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#if EN_USART1_RX //如果使能了接收
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//串口1中断服务程序
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//注意,读取USARTx->SR能避免莫名其妙的错误
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u8 USART_RX_BUF[USART_REC_LEN]; //接收缓冲,最大USART_REC_LEN个字节.
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//接收状态
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//bit15， 接收完成标志
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//bit14， 接收到0x0d
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//bit13~0， 接收到的有效字节数目
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u16 USART_RX_STA = 0; //接收状态标记
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/**
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* @brief 初始化串口0函数
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*
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* @param bound 串口波特率
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*
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* @return void
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*/
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void uart_init(u32 bound)
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{
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u32 bd;
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u32 apbclk;
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tls_sys_clk sysclk;
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/* 1.配置IO */
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wm_uart0_tx_config(WM_IO_PA_04);
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wm_uart0_rx_config(WM_IO_PA_05);
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/* 2.波特率设置:
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ubdiv = (apbclk / (16 * bound) - 1)
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ubdiv_frac = ((apbclk % (bound * 16)) / (bound)) */
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tls_sys_clk_get(&sysclk);
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apbclk = sysclk.apbclk * 1000000;
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bd = (apbclk / (16 * bound) - 1) | (((apbclk % (bound * 16)) / (bound)) << 16);
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tls_reg_write32(HR_UART0_BAUD_RATE_CTRL, bd);
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/* 2.串口参数设置：8位数据位/1位停止位/无奇偶校验位/发送使能/接收使能 */
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tls_reg_write32(HR_UART0_LINE_CTRL, ULCON_WL8 | ULCON_TX_EN | ULCON_RX_EN);
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/* 3.硬件流控关闭 */
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tls_reg_write32(HR_UART0_FLOW_CTRL, 0);
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/* 3.不使能DMA */
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tls_reg_write32(HR_UART0_DMA_CTRL, 0);
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/* 4.FIFO触发设置：1个字节 */
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tls_reg_write32(HR_UART0_FIFO_CTRL, 0);
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/* 5.开启RX中断:接收触发中断和接收超时中断*/
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tls_reg_write32(HR_UART0_INT_MASK, 0xFF & (~(UIS_RX_FIFO | UIS_RX_FIFO_TIMEOUT)));
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/* 6.串口接收中断配置 */
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NVIC_ClearPendingIRQ(UART0_IRQn);
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NVIC_InitTypeDef NVIC_InitStruct;
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NVIC_InitStruct.NVIC_IRQChannel = UART0_IRQn;
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NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 7;
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NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;
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NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init(&NVIC_InitStruct);
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}
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/**
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* @brief 串口0中断服务程序
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*
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* @param void
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*
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* @return void
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*/
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void UART0_IRQHandler(void)
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{
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u8 res;
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if(tls_reg_read32(HR_UART0_INT_SRC) & UIS_RX_FIFO) //接收到数据
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{
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res = (u8)tls_reg_read32(HR_UART0_RX_WIN);
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if((USART_RX_STA & 0x8000) == 0) //接收未完成
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{
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if(USART_RX_STA & 0x4000) //接收到了0x0d
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{
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if(res != 0x0a)USART_RX_STA = 0; //接收错误,重新开始
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else USART_RX_STA |= 0x8000; //接收完成了
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}
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else //还没收到0X0D
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{
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if(res == 0x0d)USART_RX_STA |= 0x4000;
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else
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{
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USART_RX_BUF[USART_RX_STA & 0X3FFF] = res;
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USART_RX_STA++;
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if(USART_RX_STA > (USART_REC_LEN - 1))USART_RX_STA = 0; //接收数据错误,重新开始接收
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}
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}
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}
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tls_reg_write32(HR_UART0_INT_SRC, UIS_RX_FIFO); //清除状态标志位
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}
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if(tls_reg_read32(HR_UART0_INT_SRC) & UIS_RX_FIFO_TIMEOUT) //接收到数据
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{
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tls_reg_write32(HR_UART0_INT_SRC, UIS_RX_FIFO_TIMEOUT); //清除状态标志位
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}
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}
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#endif
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