zynq学习笔记——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

# ADV7511 I2C_SCLset_property PACKAGE_PIN AA18 [get_ports {gpio_0_tri_io[0]}]set_property IOSTANDARD LVCMOS33 [get_ports {gpio_0_tri_io[0]}]# ADV7511 I2C_SDAset_property PACKAGE_PIN Y16 [get_ports {gpio_0_tri_io[1]}]set_property IOSTANDARD LVCMOS33 [get_ports {gpio_0_tri_io[1]}]# ADV7511 HDMI_CLKset_property PACKAGE_PIN W18  [get_ports {FCLK_CLK1}]set_property IOSTANDARD LVCMOS33 [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"static XGpioPs psGpioInstancePtr;int EMIO_I2C_init(void){XGpioPs_Config* GpioConfigPtr;int xStatus;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("EMIO INIT FAILED \n\r");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);return xStatus;}void CLOCK_HIGH(void){XGpioPs_WritePin(&psGpioInstancePtr,SIOC_PIN, 1);}void CLOCK_LOW(void){XGpioPs_WritePin(&psGpioInstancePtr,SIOC_PIN, 0);}int GET_DATA(void){return XGpioPs_ReadPin(&psGpioInstancePtr,SIOD_PIN);}void DATA_INPUT(void){XGpioPs_SetDirectionPin(&psGpioInstancePtr, SIOD_PIN,DIRECTION_INPUT);//}void DATA_OUTPUT(void){XGpioPs_SetDirectionPin(&psGpioInstancePtr, SIOD_PIN,DIRECTION_OUTPUT);//}void DATA_HIGH(void){XGpioPs_WritePin(&psGpioInstancePtr,SIOD_PIN, 1);}void DATA_LOW(void){XGpioPs_WritePin(&psGpioInstancePtr,SIOD_PIN,0);}

EMIO_init.h

#ifndef EMIO_INIT_H_#define EMIO_INIT_H_#include "xgpiops.h"int EMIO_I2C_init(void);#define SIOC_PIN 54#define SIOD_PIN 55#define RESET_PIN 56#define DIRECTION_INPUT 0#define DIRECTION_OUTPUT 1void CLOCK_HIGH(void);void CLOCK_LOW(void);void DATA_HIGH(void);void DATA_LOW(void);void DATA_INPUT(void);void DATA_OUTPUT(void);int GET_DATA(void);#endif /* EMIO_INIT_H_ */

I2C_ctrl.c

#include "sleep.h"#include "EMIO_init.h"#define I2C_DELAYusleep(10)void I2C_start(void){CLOCK_HIGH();DATA_HIGH();I2C_DELAY;DATA_LOW();I2C_DELAY;CLOCK_LOW();I2C_DELAY;}void I2C_end(void){DATA_LOW();I2C_DELAY;CLOCK_HIGH();I2C_DELAY;DATA_HIGH();I2C_DELAY;}int I2C_sendbyte( unsigned char value ){unsigned char tmp = value;unsigned char  i=0,ack;for(i=0; i<8; i++){if(tmp & 0x80 )DATA_HIGH();elseDATA_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; } return 0;}unsigned char I2C_readbyte( unsigned char addr){unsigned char  i=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(); return data;}int I2C_readdata(unsigned char id, unsigned char addr, unsigned char *value){// 两相写I2C_start();if(I2C_sendbyte(id<<1) != 0){goto error;}if(I2C_sendbyte(addr) != 0){goto error;}// 两相读I2C_start();if(I2C_sendbyte((id<<1)|0x1) != 0){goto error;}*value = I2C_readbyte(addr);I2C_end();return 0;error:I2C_end();return -1;}int I2C_senddata(unsigned char id, unsigned char addr,unsigned char value){I2C_start();if(I2C_sendbyte(id<<1) != 0){goto error;}if(I2C_sendbyte(addr) != 0){goto error;}if(I2C_sendbyte(value)!= 0){goto error;}I2C_end();return 0;error:I2C_end();return -1;}

I2C_ctrl.h

#ifndef I2C_CTRL_H_#define I2C_CTRL_H_void I2C_start(void);void I2C_end(void);//void I2C_sendbyte( unsigned char value );int I2C_senddata(unsigned char id, unsigned char subaddr,unsigned char value);int I2C_readdata(unsigned char id, unsigned char addr, unsigned char *value);#endif /* I2C_CTRL_H_ */

helloworld.c

#define ADV7511_I2C_ADDR  (0x72 >> 1)int main(){unsigned char data;int Status;    init_platform();        EMIO_I2C_init();    usleep(500*1000);    while(1)    {//读取PIDdata = 0;I2C_senddata(ADV7511_I2C_ADDR,0x41,0x40);sleep(1);if(I2C_readdata(ADV7511_I2C_ADDR,0x41,&data) != 0){print("error\n\r");}else{if(data != 0x40)print("error\n\r");}data = 0;if(I2C_readdata(ADV7511_I2C_ADDR,0xf5,&data) != 0){print("error\n\r");}else{if(data != 0x75)print("error\n\r");}data = 0;if(I2C_readdata(ADV7511_I2C_ADDR,0xf6,&data) != 0){print("error\n\r");}else{if(data != 0x11)print("error\n\r");}sleep(2);    }    cleanup_platform();    return 0;}