本文共 4164 字，大约阅读时间需要 13 分钟。

【原文链接】：

PL端GPIO控制，利用zed上的8个开关去控制8个led灯的亮灭，利用btn8和btn9两个PS按键控制Demo的开始和结束，并通过LD9显示程序是否开始。

自动生成的约束文件：

SDK创建完毕后：

程序：

#include 
   
    #include "platform.h"#include "xil_types.h"#include "xgpio.h"#include "xparameters.h"#include "xgpiops.h"#include "xil_io.h"extern char inbyte(void);//调用inbyte接收一个字节输入函数extern XGpioPs_Config XGpioPs_ConfigTable[XPAR_XGPIOPS_NUM_INSTANCES];int main() {   static XGpioPs psGpioInstancePtr;   XGpioPs_Config*GpioConfigPtr;   static XGpio GPIOInstance_Ptr0;   static XGpio GPIOInstance_Ptr1;   int xStatus0,xStatus1,xStatus,start,end;   u32 Readstatus;   int iPinNumberld9 = 7;  /*Ld9 is connected to MIO pin 7*/   int iPinNumberbtn8 = 50;/*Btn8 is connected to MIO pin 50*/   int iPinNumberbtn9 = 51;/*Btn9 is connected to MIO pin 51*/   init_platform();   print("##### Application Starts #####\n\r");   print("\r\n");   //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~   //Step-1 :AXI GPIO Initialization   //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~   xStatus0 = XGpio_Initialize(&GPIOInstance_Ptr0,XPAR_AXI_GPIO_0_DEVICE_ID);   if(XST_SUCCESS != xStatus0)     print("GPIO INIT FAILED\n\r");   xStatus1 = XGpio_Initialize(&GPIOInstance_Ptr1,XPAR_AXI_GPIO_1_DEVICE_ID);   if(XST_SUCCESS != xStatus1)     print("GPIO INIT FAILED\n\r");   //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~   //Step-2 :AXI GPIO Set the Direction   //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~   XGpio_SetDataDirection(&GPIOInstance_Ptr0, 1,0x00);   XGpio_SetDataDirection(&GPIOInstance_Ptr1, 1,0xff);   //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~   //Step-3 :PS GPIO Intialization   //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~   GpioConfigPtr = XGpioPs_LookupConfig(XPAR_PS7_GPIO_0_DEVICE_ID);   if(GpioConfigPtr == NULL)     return XST_FAILURE;   xStatus = XGpioPs_CfgInitialize(&psGpioInstancePtr,       GpioConfigPtr,       GpioConfigPtr->BaseAddr);   if(XST_SUCCESS != xStatus)     print(" PS GPIO INIT FAILED \n\r");   //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~   //Step-4 :PS GPIO pin setting to Output   //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~   XGpioPs_SetDirectionPin(&psGpioInstancePtr, iPinNumberld9,1);   XGpioPs_SetOutputEnablePin(&psGpioInstancePtr, iPinNumberld9,1);   XGpioPs_SetDirectionPin(&psGpioInstancePtr, iPinNumberbtn8,0);   XGpioPs_SetOutputEnablePin(&psGpioInstancePtr, iPinNumberbtn8,1);   XGpioPs_SetDirectionPin(&psGpioInstancePtr, iPinNumberbtn9,0);   XGpioPs_SetOutputEnablePin(&psGpioInstancePtr, iPinNumberbtn9,1);   //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~   //Step-5 :press btn8 to start and btn9 to end   //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~   while (1){  start=XGpioPs_ReadPin(&psGpioInstancePtr, iPinNumberbtn8);  if(start){  XGpioPs_WritePin(&psGpioInstancePtr,iPinNumberld9,1);  print("###################### Demo Starts ########################\r\n");  break;      }  end=XGpioPs_ReadPin(&psGpioInstancePtr, iPinNumberbtn9);  if(end){  XGpioPs_WritePin(&psGpioInstancePtr,iPinNumberld9,0);  XGpio_DiscreteWrite(&GPIOInstance_Ptr0,1,0x00);break;    }       }   //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~   //Step-6 :connect switch(8bit) to led(8bit)   //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~   while(1){      Readstatus = XGpio_DiscreteRead(&GPIOInstance_Ptr1, 1) ;      XGpio_DiscreteWrite(&GPIOInstance_Ptr0,1,Readstatus);      end=XGpioPs_ReadPin(&psGpioInstancePtr, iPinNumberbtn9);      if(end){          XGpioPs_WritePin(&psGpioInstancePtr,iPinNumberld9,0);          XGpio_DiscreteWrite(&GPIOInstance_Ptr0,1,0x00);break;      }   }   print("\r\n");   print("***********\r\n");   print("BYE \r\n");   print("***********\r\n");   cleanup_platform();   return 0; }