1. 官方介绍

• 既可以做从机也可以做主机
• 支持标准的100K和400K的速率

void i2c_master_init(unsigned char SlaveID, unsigned char DivClock)
{
    reg_i2c_speed = DivClock; //i2c clock = system_clock/(4*DivClock)
    reg_i2c_id	  = SlaveID; //slave address
    reg_i2c_mode |= FLD_I2C_MASTER_EN; //enable master mode

    reg_clk_en0 |= FLD_CLK0_I2C_EN;    //enable i2c clock
    reg_spi_sp  &= ~FLD_SPI_ENABLE;   //force PADs act as I2C; i2c and spi share the hardware of IC
}

2.IIC初始化

/*
 * mat_iic.c
 *
 *  Created on: 2022-8-16
 *      Author: 
 */
#include "mat_iic.h"
#include "i2c.h"

#define SLAVE_ADDR		0x82
#define DIV_CLOCK 		10

void iic_init(void)
{
	i2c_gpio_set(I2C_GPIO_GROUP_C0C1);
	i2c_master_init(SLAVE_ADDR, DIV_CLOCK);//system clock = 16MHz, 16/(4*10) = 0.4M = 400K
}



void iic_test(void)
{
	unsigned char read_point_arr[64] = {0};
	i2c_read_series(0x82, 1, read_point_arr, 64);
}

我使用的IIC读数据并不是标准的IIC通信，我的不需要发送设备地址，直接发送读取设备寄存器，设备那边就会反回数据，以下为我修改的读数据函数：

void i2c_read_series(unsigned int Addr, unsigned int AddrLen, unsigned char * dataBuf, int dataLen)
{

	reg_i2c_id	 &= (~FLD_I2C_WRITE_READ_BIT); //SlaveID & 0xfe,.i.e write data. R:High  W:Low
	if(AddrLen == 0){
	#if (I2C_SLAVE_DEVICE_NO_START_EN)
		reg_i2c_ctrl = FLD_I2C_CMD_ID ;
	#else
		//lanuch start /id    start
		reg_i2c_ctrl = (FLD_I2C_CMD_START );// when addr=0,other (not telink) iic device no need start signal
	#endif
	}
	else if (AddrLen == 1) {
#if 0
		reg_i2c_adr = (unsigned char)Addr; //address
		//lanuch start /id/04    start


		//reg_i2c_ctrl = (FLD_I2C_CMD_ID | FLD_I2C_CMD_ADDR | FLD_I2C_CMD_START);
		reg_i2c_ctrl = (FLD_I2C_CMD_ADDR | FLD_I2C_CMD_START);
#endif
		reg_i2c_map_hadr = (unsigned char)Addr;
		//reg_i2c_ctrl = ( FLD_I2C_CMD_START);

	}
	else if (AddrLen == 2) {
		reg_i2c_adr = (unsigned char)(Addr>>8); //address high
		reg_i2c_do = (unsigned char)Addr; //address low
		//lanuch start /id/04/05    start
		reg_i2c_ctrl = (FLD_I2C_CMD_ID | FLD_I2C_CMD_ADDR | FLD_I2C_CMD_DO | FLD_I2C_CMD_START);
	}
	else if (AddrLen == 3) {
		reg_i2c_adr = (unsigned char)(Addr>>16); //address high
		reg_i2c_do = (unsigned char)(Addr>>8); //address middle
		reg_i2c_di = (unsigned char)(Addr);    //address low
		//lanuch start /id/04/05/06    start
		reg_i2c_ctrl = (FLD_I2C_CMD_ID | FLD_I2C_CMD_ADDR | FLD_I2C_CMD_DO | FLD_I2C_CMD_DI | FLD_I2C_CMD_START);
	}
	while(reg_i2c_status & FLD_I2C_CMD_BUSY	);

	//start + id(Read)
	reg_i2c_id	 |= FLD_I2C_WRITE_READ_BIT;  //SlaveID & 0xfe,.i.e write data. Read:High  Write:Low
	reg_i2c_ctrl = (FLD_I2C_CMD_ID | FLD_I2C_CMD_START);
	while(reg_i2c_status & FLD_I2C_CMD_BUSY	);

	//read data
	unsigned int bufIndex = 0;

	dataLen--;    //the length of reading data must larger than 0
	//if not the last byte master read slave, master wACK to slave
	while(dataLen){  //
		reg_i2c_ctrl = (FLD_I2C_CMD_DI | FLD_I2C_CMD_READ_ID);
		while(reg_i2c_status & FLD_I2C_CMD_BUSY	);
		dataBuf[bufIndex] = reg_i2c_di;
		bufIndex++;
		dataLen--;
	}
	//when the last byte, master will ACK to slave
	reg_i2c_ctrl = (FLD_I2C_CMD_DI | FLD_I2C_CMD_READ_ID | FLD_I2C_CMD_ACK);
	while(reg_i2c_status & FLD_I2C_CMD_BUSY	);
	dataBuf[bufIndex] = reg_i2c_di;

	//termiante
	reg_i2c_ctrl = FLD_I2C_CMD_STOP; //launch stop cycle
	while(reg_i2c_status & FLD_I2C_CMD_BUSY	);
}

3.关于读取数据的问题

在裸机的情况下，如果读取数据，数据是可以在很快的速度下进行读的，但是当开启蓝牙后（蓝牙并没有连接），读数据的时候就会出现丢包，并且这个丢包率很严重。后来在网上查了一下，发现也有人遇到相同问题：裸机运行OK，在蓝牙demo中运行就会出现丢数据。经那位老哥说是开启了休眠，把休眠关掉就可以了。

在app_config.h文件下：

#define BLE_APP_PM_ENABLE								0//1
#define PM_DEEPSLEEP_RETENTION_ENABLE					0//1

参考链接：

泰凌微 Telink TLSR825X Uart 串口无法接收数据 关闭休眠和深度休眠解决 问题_greatriver007的博客-CSDN博客