CC2640R2F I2C驱动

cc26xxi2c.c文件：

#include \"cc26xxi2c.h\"
#include <ti/sysbios/knl/Clock.h>
#include <ti/drivers/I2C.h>
#include <ti/drivers/i2c/I2CCC26XX.h>
#include <ti/drivers/power/PowerCC26XX.h>
#include \"sdi_task.h\"
#include \"icall.h\"
#include <stdlib.h>
#include <string.h>

I2CCC26XX_Object _i2cCC26xxObjects[CC2640R2_LAUNCHXL_I2CCOUNT];

const I2CCC26XX_HWAttrsV1 _i2cCC26xxHWAttrs[CC2640R2_LAUNCHXL_I2CCOUNT] = 
{
    {
        .baseAddr    = I2C0_BASE,
        .powerMngrId = PowerCC26XX_PERIPH_I2C0,
        .intNum      = INT_I2C_IRQ,
        .intPriority = ~0,
        .swiPriority = 0,
        .sdaPin      = CC2640R2_LAUNCHXL_I2C0_SDA0,
        .sclPin      = CC2640R2_LAUNCHXL_I2C0_SCL0,
    }
};

const I2C_Config cc26xxI2C_config[CC2640R2_LAUNCHXL_I2CCOUNT] = 
{
    {
        .fxnTablePtr = &I2CCC26XX_fxnTable,
        .object      = &_i2cCC26xxObjects[CC2640R2_LAUNCHXL_I2C0],
        .hwAttrs     = &_i2cCC26xxHWAttrs[CC2640R2_LAUNCHXL_I2C0]
    },
};

//I2C 句柄及参数
static I2C_Handle cc2640_I2C_Handle;
static I2C_Params cc2640_I2C_Params;
static I2C_Transaction transaction;

//初始化I2C
void i2c_init(void)
{
  I2C_Params_init(&cc2640_I2C_Params);
  cc2640_I2C_Params.transferMode = I2C_MODE_BLOCKING; //i2c阻塞模式
  cc2640_I2C_Params.bitRate = I2C_400kHz; //高速i2c模式
  cc2640_I2C_Params.transferCallbackFxn = NULL; 
  cc26xxI2C_config[CC2640R2_LAUNCHXL_I2C0].fxnTablePtr->initFxn((I2C_Handle)&cc26xxI2C_config[CC2640R2_LAUNCHXL_I2C0]);
  cc2640_I2C_Handle = cc26xxI2C_config[CC2640R2_LAUNCHXL_I2C0].fxnTablePtr->openFxn((I2C_Handle)&cc26xxI2C_config[CC2640R2_LAUNCHXL_I2C0],&cc2640_I2C_Params);
  if (cc2640_I2C_Handle == NULL)
  {
    SDITask_sendToUART(\"i2c init fail\\r\\n\",15);
    for(;;);
  }
}

//i2c写入数据
static void i2c_write(size_t slaveAddress,uint8_t *write_data,size_t len)
{
  transaction.slaveAddress = slaveAddress;
  transaction.writeBuf = write_data;
  transaction.writeCount = len;
  transaction.readBuf = NULL;
  transaction.readCount = 0;
  transaction.arg = NULL;
  cc26xxI2C_config[CC2640R2_LAUNCHXL_I2C0].fxnTablePtr->transferFxn(cc2640_I2C_Handle,&transaction);
}

//i2c读取数据
static void i2c_read(uint8_t slaveAddress,uint8_t *read_data,uint8_t len)
{
  transaction.slaveAddress = slaveAddress;
  transaction.writeBuf = NULL;
  transaction.writeCount = 0;
  transaction.readBuf = read_data;
  transaction.readCount = len;
  transaction.arg = NULL;
  if (cc26xxI2C_config[CC2640R2_LAUNCHXL_I2C0].fxnTablePtr->transferFxn(cc2640_I2C_Handle,&transaction))
  {
    SDITask_sendToUART(\"i2c read success\\r\\n\",18);
  }
}

//i2c写一个字节数据
void i2c_write_one_byte(uint8_t SlaveAddr, uint8_t Cmd, uint8_t Data)
{
  uint8_t buf[2] = {0};
  buf[0] = Cmd;
  buf[1] = Data;
  i2c_write(SlaveAddr,buf,sizeof(buf));
}

//i2c写多个字节
void i2c_write_multi_byte(uint8_t SlaveAddr, uint8_t Cmd, uint8_t *pData, uint8_t Len)
{
  uint8_t *buf = ICall_malloc(Len + 1);
  buf[0] = Cmd;
  memcpy(buf+1,pData,Len);
  i2c_write(SlaveAddr,buf,sizeof(buf));
  ICall_free(buf);
  buf = NULL;
}

//i2c读一个字节数据
void i2c_read_one_byte(uint8_t SlaveAddr, uint8_t Cmd, uint8_t *pData)
{
  i2c_write(SlaveAddr,&Cmd,1);
  i2c_read(SlaveAddr,pData,1);
}

//i2c读多个字节数据
void i2c_read_multi_byte(uint8_t SlaveAddr, uint8_t Cmd, uint8_t *pData, uint8_t Len)
{
  i2c_write(SlaveAddr,&Cmd,1);
  i2c_read(SlaveAddr,pData,Len);
}

//写入16bit地址数据
void i2c_write_two_byte_addr(uint8_t SlaveAddr,uint16_t Cmd,uint8_t *pData, uint8_t Len )
{
  uint8_t addr[2] = {0};
  addr[0] = Cmd >> 8;
  addr[1] = Cmd;
  i2c_write(SlaveAddr,addr,2);
  i2c_write(SlaveAddr,pData,Len);
}

cc26xxi2c.h文件：

#ifndef __CC26XXI2C_H
#define __CC26XXI2C_H 
#include \"board.h\"
#include \"ti/sysbios/knl/Task.h\"

/* I2C */
#define CC2640R2_LAUNCHXL_I2C0_SCL0             IOID_4    //i2c SCL时钟线
#define CC2640R2_LAUNCHXL_I2C0_SDA0             IOID_5    //i2c SDA数据线

/*!
 *  @def    CC2640R2_LAUNCHXL_I2CName
 *  @brief  Enum of I2C names
 */
typedef enum CC2640R2_LAUNCHXL_I2CName {
    CC2640R2_LAUNCHXL_I2C0 = 0,

    CC2640R2_LAUNCHXL_I2CCOUNT
} CC2640R2_LAUNCHXL_I2CName;

void i2c_init(void);
void i2c_write_one_byte(uint8_t SlaveAddr, uint8_t Cmd, uint8_t Data);
void i2c_write_multi_byte(uint8_t SlaveAddr, uint8_t Cmd, uint8_t *pData, uint8_t Len);
void i2c_read_one_byte(uint8_t SlaveAddr, uint8_t Cmd, uint8_t *pData);
void i2c_read_multi_byte(uint8_t SlaveAddr, uint8_t Cmd, uint8_t *pData, uint8_t Len);
void i2c_write_two_byte_addr(uint8_t SlaveAddr,uint16_t Cmd,uint8_t *pData, uint8_t Len );
#endif

main函数测试代码：

逻辑分析仪i2c写波形图：

逻辑分析仪i2c读波形图：

本次测试采用AT24Cxx芯片作为i2c的从器件，向地址中写入一个字节，在读取出来看是否相等，结果写入与读取数据一样，i2c通信成功。