i2c_drv.h

一个基于ARM平台的触摸屏程序。

#ifndef _I2C_INTERFACE_H
#define _I2C_INTERFACE_H

#define FRAME_LENGTH	8	// bits

/* the chip CH7004 addr is 0x76, the pin 'ADDR' must connect to ground */
#define CH7004_WR_DAB	0xEC		// write
#define CH7004_RD_DAB	0xED		// read

/* for drive SPI like interface */
#define SDA		0x0002		//GPIO 1
#define SCL		0x0001		//GPIO 0

void init_i2c();
void clr_spi_pin(int pin);
void set_spi_pin(int pin);
void send_byte(unsigned char data);

#endif