104 lines
3.1 KiB
C
104 lines
3.1 KiB
C
/*--------------------------------------------------------------------------*/
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/**@file iic_api.c
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@brief IIC_API模块
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@details
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@author
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@date 2011-3-7
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@note
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*/
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/*----------------------------------------------------------------------------*/
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#include "asm/iic_io.h"
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u32 iic_busy = 0; ///<iic繁忙标记
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/*----------------------------------------------------------------------------*/
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/**@brief IIC写函数
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@param chip_id ：目标IC的ID号
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@param iic_addr: 目标IC的目标寄存器的地址
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@param *iic_dat: 写望目标IC的数据的指针
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@param n:需要写的数据的数目
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@return 无
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@note void iic_write(u8 chip_id,u8 iic_addr,u8 *iic_dat,u8 n)
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*/
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/*----------------------------------------------------------------------------*/
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void iic_writen(u8 chip_id, u8 iic_addr, u8 *iic_dat, u8 n)
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{
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iic_busy = 1;
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iic_start(); //I2C启动
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iic_sendbyte(chip_id); //写命令
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if (0xff != iic_addr) {
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iic_sendbyte(iic_addr); //写地址
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}
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for (; n > 0; n--) {
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iic_sendbyte(*iic_dat++); //写数据
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}
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iic_stop(); //I2C停止时序
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iic_busy = 0;
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}
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void iic_write(u8 chip_id, u8 iic_addr, u8 dat)
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{
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iic_busy = 1;
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iic_start(); //I2C启动
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iic_sendbyte(chip_id); //写命令
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//if (0xff != iic_addr)
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{
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iic_sendbyte(iic_addr); //写地址
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}
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//for (;n>0;n--)
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{
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iic_sendbyte(dat); //写数据
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}
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delay(1000);//76us 至少延时64us
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iic_stop(); //I2C停止时序
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iic_busy = 0;
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}
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/*----------------------------------------------------------------------------*/
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/**@brief IIC总线向一个目标ID读取几个数据
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@param address : 目标ID
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@param *p : 存档读取到的数据的buffer指针
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@param number : 需要读取的数据的个数
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@return 无
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@note void i2c_read_nbyte(u8 address,u8 *p,u8 number)
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*/
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/*----------------------------------------------------------------------------*/
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void iic_readn(u8 chip_id, u8 iic_addr, u8 *iic_dat, u16 n)
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{
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iic_busy = 1;
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iic_start(); //I2C启动
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iic_sendbyte(chip_id); //写命令
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//if (0xff != iic_addr)
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{
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iic_sendbyte(iic_addr); //写地址
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}
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iic_start();
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iic_sendbyte(chip_id | BIT(0));
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for (; n > 1; n--) {
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*iic_dat++ = iic_revbyte(0);//读数据
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delay(1000);//76us 至少延时64us
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}
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*iic_dat++ = iic_revbyte(1);
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delay(1000);//76us 至少延时64us
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iic_stop(); //I2C停止时序
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iic_busy = 0;
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}
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u8 iic_read(u8 chip_id, u8 iic_addr)
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{
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u8 byte;
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iic_busy = 1;
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iic_start(); //I2C启动
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iic_sendbyte(chip_id); //写命令
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iic_sendbyte(iic_addr); //写地址
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iic_start(); //写转为读命令，需要再次启动I2C
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iic_sendbyte(chip_id | BIT(0)); //读命令
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byte = iic_revbyte(1);
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delay(1000);//76us 至少延时64us
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iic_stop(); //I2C停止
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iic_busy = 0;
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return byte;
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}
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