IIC 인터페이스 참조 코드

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/*

helloworld.c: simple test application

This application configures UART 16550 to baud rate 9600.

PS7 UART (Zynq) is not initialized by this application, since

bootrom/bsp configures it to baud rate 115200

| UART TYPE BAUD RATE |

uartns550 9600

uartlite Configurable only in HW design

ps7_uart 115200 (configured by bootrom/bsp) */

#include #include “platform.h” #include “xil_printf.h” #include “sleep.h” #include “xparameters.h” #include “xiicps.h”
#define DEVICE_ID XPAR_PS7_I2C_0_DEVICE_ID #define IIC_RATE 100000//100KHz #define IIC_SLV_ADDR 0x40
static XIicPs IicPs; static XIicPs_Config * IicPsCfgPtr;
int initIicPs(XIicPs *iicps,XIicPs_Config * iiccfg); double avgFilter(double * srtDataPtr,double inData,int count);
int main() { int status; double avgData[4]; status = initIicPs(&IicPs,IicPsCfgPtr); if(status != XST_SUCCESS) { printf(“fail %d”,status); return XST_FAILURE; } char CmdHum = 0xE5; char CmdTemp = 0xE3; char Hdata[2]; char Tdata[2]; double Tout,Hout; unsigned short tmp = 0; while (1) { status = XIicPs_MasterSendPolled(&IicPs,&CmdTemp,0x01,IIC_SLV_ADDR); if(status != XST_SUCCESS) { printf(“fail %d”,status); return XST_FAILURE; } status = XIicPs_MasterRecvPolled(&IicPs,Tdata,0x02,IIC_SLV_ADDR);

	status = XIicPs_MasterSendPolled(&IicPs,&CmdHum,0x01,IIC_SLV_ADDR);
	if(status != XST_SUCCESS)
	{
		printf("fail %d",status);
		return XST_FAILURE;
	}
	status = XIicPs_MasterRecvPolled(&IicPs,Hdata,0x02,IIC_SLV_ADDR);
	tmp = (Tdata[0] <<8)|(Tdata[1] & 0xFC);
	Tout = 175.72*tmp/65536 -46.85;
	tmp = (Hdata[0] <<8) | (Hdata[1] &0xFD);
	Hout = 125*tmp / 65536 -6;
	Tout = avgFilter(avgData,Tout,0x04);
	printf("Temp = %.1f , Hum = %.1f
\r",Tout,Hout);
    printf("Hello World
\r");
    usleep(1000000);
}
return 0;

}
int initIicPs(XIicPs *iicps,XIicPs_Config * iiccfg) { int status; iiccfg = XIicPs_LookupConfig(DEVICE_ID); status = XIicPs_CfgInitialize(iicps,iiccfg,iiccfg->BaseAddress); if(status != XST_SUCCESS) { printf(“fail %d”,status); return XST_FAILURE; } status = XIicPs_SetSClk(iicps,IIC_RATE); if(status != XST_SUCCESS) { printf(“fail %d”,status); return XST_FAILURE; } return XST_SUCCESS; }
double avgFilter(double * srtDataPtr,double inData,int count) { int i; double outData; for(i = 0;i < count ; i++) { if(i < count-1) { srtDataPtr[i+1] = srtDataPtr[i]; } } srtDataPtr[0] = inData; outData = (srtDataPtr[0] + srtDataPtr[1] + srtDataPtr[2] + srtDataPtr[3])/4; return outData; }