CC2652RB的硬件I2C
使用 CC2652RB 的 SDK 开发包提供的例程 ( I2CTemp ) 加以修改读取加速度传感器 fxos8700cq .
SDK里已经把它所有外设的驱动都封装成库，只要按照 <I2c.h> 文件中提供的说明，按顺序调用对应的API即可使用，例如：
/*!****************************************************************************
* @file I2C.h
* @brief Inter-Integrated Circuit (I2C) Driver
*
* @anchor ti_drivers_I2C_Overview
* # Overview
*
* The I2C driver is designed to operate as an I2C master and will not
* function as an I2C slave. Multi-master arbitration is not supported;
* therefore, this driver assumes it is the only I2C master on the bus.
* This I2C driver's API set provides the ability to transmit and receive
* data over an I2C bus between the I2C master and I2C slave(s). The
* application is responsible for manipulating and interpreting the data.
*
*
* <hr>
* @anchor ti_drivers_I2C_Usage
* # Usage
*
* This section provides a basic @ref ti_drivers_I2C_Synopsis
* "usage summary" and a set of @ref ti_drivers_I2C_Examples "examples"
* in the form of commented code fragments. Detailed descriptions of the
* I2C APIs and their effect are provided in subsequent sections.
*
* @anchor ti_drivers_I2C_Synopsis
* ## Synopsis #
* @anchor ti_drivers_I2C_Synopsis_Code
* @code
* // Import I2C Driver definitions
* #include <ti/drivers/I2C.h>
*
* // Define name for an index of an I2C bus
* #define SENSORS 0
*
* // Define the slave address of device on the SENSORS bus
* #define OPT_ADDR 0x47
*
* // One-time init of I2C driver
* I2C_init();
*
* // initialize optional I2C bus parameters
* I2C_Params params;
* I2C_Params_init(¶ms);
* params.bitRate = I2C_400kHz;
*
* // Open I2C bus for usage
* I2C_Handle i2cHandle = I2C_open(SENSORS, ¶ms);
*
* // Initialize slave address of transaction
* I2C_Transaction transaction = {0};
* transaction.slaveAddress = OPT_ADDR;
*
* // Read from I2C slave device
* transaction.readBuf = data;
* transaction.readCount = sizeof(data);
* transaction.writeCount = 0;
* I2C_transfer(i2cHandle, &transaction);
*
* // Write to I2C slave device
* transaction.writeBuf = command;
* transaction.writeCount = sizeof(command);
* transaction.readCount = 0;
* I2C_transferTimeout(i2cHandle, &transaction, 5000);
*
* // Close I2C
* I2C_close(i2cHandle);
这里仅贴出了一下部分，具体请到对应的 .h 文件中查阅.
初始化硬件I2C
I2C_Handle i2cHandle; //硬件 I2C 的句柄
I2C_Params i2cParams; //硬件 I2C 参数配置的变量
/*
* ======== i2cErrorHandler ========
*/
static void i2cErrorHandler(I2C_Transaction *transaction,
Display_Handle display)
{
switch (transaction->status) {
case I2C_STATUS_TIMEOUT:
Display_printf(display, 0, 0, "I2C transaction timed out!");
break;
case I2C_STATUS_CLOCK_TIMEOUT:
Display_printf(display, 0, 0, "I2C serial clock line timed out!");
break;
case I2C_STATUS_ADDR_NACK:
Display_printf(display, 0, 0, "I2C slave address 0x%x not"
" acknowledged!", transaction->slaveAddress);
break;
case I2C_STATUS_DATA_NACK:
Display_printf(display, 0, 0, "I2C data byte not acknowledged!");
break;
case I2C_STATUS_ARB_LOST:
Display_printf(display, 0, 0, "I2C arbitration to another master!");
break;
case I2C_STATUS_INCOMPLETE:
Display_printf(display, 0, 0, "I2C transaction returned before completion!");
break;
case I2C_STATUS_BUS_BUSY:
Display_printf(display, 0, 0, "I2C bus is already in use!");
break;
case I2C_STATUS_CANCEL:
Display_printf(display, 0, 0, "I2C transaction cancelled!");
break;
case I2C_STATUS_INVALID_TRANS:
Display_printf(display, 0, 0, "I2C transaction invalid!");
break;
case I2C_STATUS_ERROR:
Display_printf(display, 0, 0, "I2C generic error!");
break;
default:
Display_printf(display, 0, 0, "I2C undefined error case!");
break;
}
}
/* 硬件I2C的初始化 */
void bsp_Cc2652I2c0Init(void)
{
I2C_init();
/* Create I2C for usage */
I2C_Params_init(&i2cParams);
i2cParams.bitRate = I2C_400kHz;
i2cHandle = I2C_open(CC2652RB_I2C0, &i2cParams);
if (i2cHandle == NULL) {
Display_printf(display, 0, 0, "Error Initializing I2C\n");
while (1);
}
else {
Display_printf(display, 0, 0, "I2C Initialized!\n");
}
}
使用硬件 I2C 读写传感器寄存器
- 将数据写入 fxos8700cq 传感器寄存器
/*******************************************************************************
* 名 称： bsp_Fxos8700cqWrSingleCmd
* 功 能： Fxos8700cq写一个单指令。
* 入口参数： _ucSlaveAddr: i2c 从机地址
* _ucRegAddr： 需要写入的寄存器地址
* _ucRegData： 写入寄存器的数据
* 出口参数： 无
* 作 者： Roger-WY
* 创建日期： 2020-12-30
* 修 改：
* 修改日期：
* 备 注：
*******************************************************************************/
int8_t bsp_Fxos8700cqWrSingleCmd(uint8_t _ucSlaveAddr,uint8_t _ucRegAddr,uint8_t _ucRegData)
{
uint8_t sendBuff[2] = {0};
I2C_Transaction i2cTransaction = {0};
sendBuff[0] = _ucRegAddr;
sendBuff[1] = _ucRegData;
i2cTransaction.slaveAddress = _ucSlaveAddr;
i2cTransaction.writeBuf = sendBuff;
i2cTransaction.writeCount = 2;
i2cTransaction.readBuf = NULL;
i2cTransaction.readCount = 0;
if (I2C_transfer(i2cHandle, &i2cTransaction)) {
Display_printf(display, 0, 0, "i2c writer reg:%02X value:%02X,succeed!\n",_ucRegAddr,_ucRegData);
return 0;
}
else {
i2cErrorHandler(&i2cTransaction, display);
return -1;
}
}
- 从 fxos8700cq 传感器寄存器中读取数据
/*******************************************************************************
* 名 称： bsp_Fxos8700cqRdData
* 功 能： Fxos8700cq读取寄存器数据。
* 入口参数： _ucSlaveAddr: i2c 从机地址
* _ucRegAddr： 需要读取的寄存器起始地址
* *_pRegData： 读出来的数据缓存数组
* _ucRegCnt ： 需要读取的寄存器个数
* 出口参数： 无
* 作 者： Roger-WY
* 创建日期： 2020-12-30
* 修 改：
* 修改日期：
* 备 注：
*******************************************************************************/
int8_t bsp_Fxos8700cqRdRegData(uint8_t _ucSlaveAddr,uint8_t _ucRegAddr,uint8_t *_pRegData,uint8_t _ucRegCnt)
{
I2C_Transaction i2cTransaction = {0};
i2cTransaction.slaveAddress = _ucSlaveAddr;
i2cTransaction.writeBuf = &_ucRegAddr;
i2cTransaction.writeCount = 1;
i2cTransaction.readBuf = _pRegData;
i2cTransaction.readCount = _ucRegCnt;
if (I2C_transfer(i2cHandle, &i2cTransaction)) {
Display_printf(display, 0, 0, "i2c read reg:%02X succeed!\n",_ucRegAddr);
return 0;
}
else {
i2cErrorHandler(&i2cTransaction, display);
return -1;
}
}
读取 FXOS8700CQ 的数据
测试工程
/*
* ======== mainThread ========
*/
void *mainThread(void *arg0)
{
/* Call driver init functions */
Display_init();
GPIO_init();
//I2C_init();
/* Configure the LED */
GPIO_setConfig(CONFIG_GPIO_LED_0, GPIO_CFG_OUT_STD | GPIO_CFG_OUT_LOW);
GPIO_setConfig(CONFIG_GPIO_LED_1, GPIO_CFG_OUT_STD | GPIO_CFG_OUT_LOW);
/* Open the UART display for output */
display = Display_open(Display_Type_UART, NULL);
if (display == NULL) {
while (1);
}
/* Turn on user LED */
GPIO_write(CONFIG_GPIO_LED_0, CONFIG_GPIO_LED_ON);
Display_printf(display, 0, 0, "Starting the fxos8700cq example");
while(bsp_Fxos8700cqInit(FXOS8700CQ_I2C_ADDR) == -1)
{
I2C_close(i2cHandle);
sleep(1);
}
GPIO_write(CONFIG_GPIO_LED_1, CONFIG_GPIO_LED_ON);
for (;;) {
bsp_Fxos8700cqClearIntFlag(FXOS8700CQ_I2C_ADDR);
bsp_ReadFxos8700cqTemp(FXOS8700CQ_I2C_ADDR,&gTemperature); //读取温度值
bsp_ReadFxos8700cqAcc(FXOS8700CQ_I2C_ADDR,&gAccData); //读取加速度计
bsp_ReadFxos8700cqMagn(FXOS8700CQ_I2C_ADDR,&gMagnData); //读取磁力计
bsp_ReadAccelMagnData(FXOS8700CQ_I2C_ADDR,&gFxosSensorVal[0],&gFxosSensorVal[1]); //读取磁力计
Display_printf(display, 0, 0, "fxos8700cq temp:%d",gTemperature);
Display_printf(display, 0, 0, "fxos8700cq accx:%d,accy:%d,accz:%d",gAccData.x,gAccData.y,gAccData.z);
Display_printf(display, 0, 0, "fxos8700cq magnx:%d,magny:%d,magnz:%d",gMagnData.x,gMagnData.y,gMagnData.z);
/* Sleep for 1 second */
sleep(1);
}
//Display_printf(display, 0, 0, "I2C closed!");
//return (NULL);
}
- 使用IAR搭建CC2652RB的开发环境
- FXOS8700CQ 6轴传感器的介绍与调试
- 完整的工程下载，请点击 CC2652RB硬件I2C读取FXOS8700CQ加速度传感器，如果您没有积分可以留言，我单独发您。
PS:
- IAR FOR ARM 需要 8.50.9 及以上版本才能打开.
- 需要先安装 CC2652RB 的 SDK，且需要安装在默认位置.