Zynq上UART/IIC/SPI的27个实验-第2课：PS 硬件 UART 接收

目录

目标

串口接收中断中记录接收到的数据并置位标志，
主循环检测该标志后，将接收到的消息统一发送出去。

BD

main.cpp

#include"xparameters.h"#include"xuartps.h"#include"xscugic.h"#include"xil_exception.h"#include"xil_printf.h"#include"sleep.h"#include<string.h>/* ================= 配置 ================= */#defineUART_DEVICE_IDXPAR_XUARTPS_0_DEVICE_ID#defineUART_INTR_IDXPAR_XUARTPS_0_INTR#defineGIC_DEVICE_IDXPAR_PS7_SCUGIC_0_DEVICE_ID#defineRX_BUF_SIZE64/* ================= 全局对象 ================= */staticXUartPs UartPs;staticXScuGic Intc;/* RX 缓冲 + 标志 */staticvolatileintrx_ready=0;staticvolatileu32 rx_len=0;staticu8 rx_buf[RX_BUF_SIZE];/* ================= BSP 风格发送接口 ================= */voidBspUartWrite(uint8_t*buf,uint32_tlen){uint32_tsent=0;while(sent<len){sent+=XUartPs_Send(&UartPs,buf+sent,len-sent);}}/* ================= UART RX 中断回调 ================= */staticvoidUartHandler(void*CallBackRef,u32 Event,unsignedintEventData){if((Event==XUARTPS_EVENT_RECV_DATA)||(Event==XUARTPS_EVENT_RECV_TOUT)){if(EventData>0&&rx_ready==0){rx_len=EventData;rx_ready=1;/* 只置标志，不发送 */}/* 重新启动接收 */XUartPs_Recv(&UartPs,rx_buf,RX_BUF_SIZE);}}/* ================= UART 初始化 ================= */staticintBspUartInit(void){intStatus;XUartPs_Config*Config;Config=XUartPs_LookupConfig(UART_DEVICE_ID);if(!Config)returnXST_FAILURE;Status=XUartPs_CfgInitialize(&UartPs,Config,Config->BaseAddress);if(Status!=XST_SUCCESS)returnStatus;XUartPs_SelfTest(&UartPs);XUartPs_SetBaudRate(&UartPs,115200);XUartPs_SetOperMode(&UartPs,XUARTPS_OPER_MODE_NORMAL);XUartPs_SetHandler(&UartPs,UartHandler,&UartPs);XUartPs_SetInterruptMask(&UartPs,XUARTPS_IXR_RXFULL|XUARTPS_IXR_RXOVR|XUARTPS_IXR_TOUT);XUartPs_SetRecvTimeout(&UartPs,8);XUartPs_Recv(&UartPs,rx_buf,RX_BUF_SIZE);returnXST_SUCCESS;}/* ================= GIC 初始化 ================= */staticintGicInit(void){intStatus;XScuGic_Config*Cfg;Cfg=XScuGic_LookupConfig(GIC_DEVICE_ID);if(!Cfg)returnXST_FAILURE;Status=XScuGic_CfgInitialize(&Intc,Cfg,Cfg->CpuBaseAddress);if(Status!=XST_SUCCESS)returnStatus;Xil_ExceptionInit();Xil_ExceptionRegisterHandler(XIL_EXCEPTION_ID_INT,(Xil_ExceptionHandler)XScuGic_InterruptHandler,&Intc);Status=XScuGic_Connect(&Intc,UART_INTR_ID,(Xil_ExceptionHandler)XUartPs_InterruptHandler,&UartPs);if(Status!=XST_SUCCESS)returnStatus;XScuGic_Enable(&Intc,UART_INTR_ID);Xil_ExceptionEnable();returnXST_SUCCESS;}/* ================= main ================= */intmain(void){intStatus;xil_printf("UART RX interrupt flag echo test\r\n");Status=BspUartInit();if(Status!=XST_SUCCESS){xil_printf("UART init failed\r\n");while(1);}Status=GicInit();if(Status!=XST_SUCCESS){xil_printf("GIC init failed\r\n");while(1);}constchar*msg="Type something, main loop will echo.\r\n";BspUartWrite((uint8_t*)msg,strlen(msg));while(1){if(rx_ready){/* 主循环里发送 */BspUartWrite(rx_buf,rx_len);/* 清标志 */rx_ready=0;rx_len=0;}}return0;}