EMIO方式模拟I2C时序对ADV7511进行读写

EMIO方式模拟I2C时序对ADV7511进行读写创建硬件工程，很简单，PS接出两个EMIO和一个74.25M时钟管脚约束

#ADV7511I2C_SCL

set_propertyPACKAGE_PINAA18[get_ports{gpio_0_tri_io[0]}]

set_propertyIOSTANDARDLVCMOS33[get_ports{gpio_0_tri_io[0]}]#ADV7511I2C_SDA

set_propertyPACKAGE_PINY16[get_ports{gpio_0_tri_io[1]}]

set_propertyIOSTANDARDLVCMOS33[get_ports{gpio_0_tri_io[1]}]#ADV7511HDMI_CLK

set_propertyPACKAGE_PINW18[get_ports{FCLK_CLK1}]

set_propertyIOSTANDARDLVCMOS33[get_ports{FCLK_CLK1}]导出Hardware，启动SDK，新建一个应用，添加以下代码EMIO_init.c

#include"EMIO_init.h"staticXGpioPspsGpioInstancePtr;

intEMIO_I2C_init(void)

{

XGpioPs_Config*GpioConfigPtr;

intxStatus;GpioConfigPtr=XGpioPs_LookupConfig(XPAR_PS7_GPIO_0_DEVICE_ID);

if(GpioConfigPtr==NULL)

returnXST_FAILURE;xStatus=XGpioPs_CfgInitialize(&psGpioInstancePtr,GpioConfigPtr,GpioConfigPtr->BaseAddr);

if(XST_SUCCESS!=xStatus)

print("EMIOINITFAILED");XGpioPs_SetDirectionPin(&psGpioInstancePtr,SIOC_PIN,DIRECTION_OUTPUT);

XGpioPs_SetDirectionPin(&psGpioInstancePtr,SIOD_PIN,DIRECTION_OUTPUT);XGpioPs_SetOutputEnablePin(&psGpioInstancePtr,SIOC_PIN,1);

XGpioPs_SetOutputEnablePin(&psGpioInstancePtr,SIOD_PIN,1);returnxStatus;

}voidCLOCK_HIGH(void)

{

XGpioPs_WritePin(&psGpioInstancePtr,SIOC_PIN,1);

}voidCLOCK_LOW(void)

{

XGpioPs_WritePin(&psGpioInstancePtr,SIOC_PIN,0);

}intGET_DATA(void)

{

returnXGpioPs_ReadPin(&psGpioInstancePtr,SIOD_PIN);

}voidDATA_INPUT(void)

{

XGpioPs_SetDirectionPin(&psGpioInstancePtr,SIOD_PIN,DIRECTION_INPUT);//

}voidDATA_OUTPUT(void)

{

XGpioPs_SetDirectionPin(&psGpioInstancePtr,SIOD_PIN,DIRECTION_OUTPUT);//

}voidDATA_HIGH(void)

{

XGpioPs_WritePin(&psGpioInstancePtr,SIOD_PIN,1);

}voidDATA_LOW(void)

{

XGpioPs_WritePin(&psGpioInstancePtr,SIOD_PIN,0);

}EMIO_init.h

#ifndefEMIO_INIT_H_

#defineEMIO_INIT_H_#include"xgpiops.h"intEMIO_I2C_init(void);#defineSIOC_PIN54

#defineSIOD_PIN55

#defineRESET_PIN56#defineDIRECTION_INPUT0

#defineDIRECTION_OUTPUT1voidCLOCK_HIGH(void);voidCLOCK_LOW(void);voidDATA_HIGH(void);voidDATA_LOW(void);voidDATA_INPUT(void);voidDATA_OUTPUT(void);intGET_DATA(void);#endif/*EMIO_INIT_H_*/I2C_ctrl.c

#include"sleep.h"

#include"EMIO_init.h"#defineI2C_DELAYusleep(10)voidI2C_start(void)

{

CLOCK_HIGH();

DATA_HIGH();

I2C_DELAY;

DATA_LOW();

I2C_DELAY;

CLOCK_LOW();

I2C_DELAY;

}voidI2C_end(void)

{

DATA_LOW();

I2C_DELAY;

CLOCK_HIGH();

I2C_DELAY;

DATA_HIGH();

I2C_DELAY;

}intI2C_sendbyte(unsignedcharvalue)

{

unsignedchartmp=value;

unsignedchari=0,ack;for(i=0;i<8;i++)

{

if(tmp&0x80)

DATA_HIGH();

else

DATA_LOW();I2C_DELAY;

CLOCK_HIGH();

I2C_DELAY;

CLOCK_LOW();

I2C_DELAY;tmp<<=1;

}DATA_HIGH();

DATA_INPUT();

I2C_DELAY;

CLOCK_HIGH();

ack=GET_DATA();

I2C_DELAY;

CLOCK_LOW();

I2C_DELAY;

DATA_OUTPUT();if(ack==1)

{

return-1;

}return0;

}unsignedcharI2C_readbyte(unsignedcharaddr)

{

unsignedchari=0,data=0;DATA_HIGH();

DATA_INPUT();for(i=0;i<8;i++)

{

CLOCK_HIGH();

I2C_DELAY;data<<=1;

if(GET_DATA())

data|=1;I2C_DELAY;

CLOCK_LOW();

I2C_DELAY;

}DATA_OUTPUT();

DATA_HIGH();

I2C_DELAY;

CLOCK_HIGH();

I2C_DELAY;

CLOCK_LOW();

I2C_DELAY;

DATA_HIGH();returndata;

}intI2C_readdata(unsignedcharid,unsignedcharaddr,unsignedchar*value)

{

//两相写

I2C_start();

if(I2C_sendbyte(id<<1)!=0)

{

gotoerror;

}if(I2C_sendbyte(a