CC1310 I2C通讯时，slaveAddr 的第一位不能发送，这是为什么？

我设置的slaveAddr = 0x80;   可通过示波器看的时候第一个字节是0x00，后来改变slaveAddr的值，对比发现只是第一位没有发送。

Viki Shi：

如果只有第一位发不出来，怀疑是时序问题。试下I2C起始信号段延时是否正常

Magic：

回复 Viki Shi:

I2C起始信号段延时 在哪里设置？怎样看是否正常？

Alvin Chen：

回复 Magic:

/** Copyright (c) 2016-2017, Texas Instruments Incorporated* All rights reserved.** Redistribution and use in source and binary forms, with or without* modification, are permitted provided that the following conditions* are met:** *Redistributions of source code must retain the above copyright*notice, this list of conditions and the following disclaimer.** *Redistributions in binary form must reproduce the above copyright*notice, this list of conditions and the following disclaimer in the*documentation and/or other materials provided with the distribution.** *Neither the name of Texas Instruments Incorporated nor the names of*its contributors may be used to endorse or promote products derived*from this software without specific prior written permission.** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.*//**======== i2ctmp007.c ========*/
#include <stdint.h>
#include <stddef.h>
#include <unistd.h>/* Driver Header files */
#include <ti/drivers/GPIO.h>
#include <ti/drivers/I2C.h>
#include <ti/display/Display.h>
#include <ti/drivers/i2c/I2CCC26XX.h>
/* Example/Board Header files */
#include "Board.h"#define TASKSTACKSIZE640
#define slaveAddr0x68
#define DEVICE_ID0x75
static Display_Handle display;
I2C_Handlei2cHandle;
I2C_Paramsi2cParams;
static uint8_t buffer[32];#define Board_I2C0_SDA1IOID_10
#define Board_I2C0_SCL1IOID_11
#define SENSOR_I2C_11
static const I2CCC26XX_I2CPinCfg pinCfg1 =
{// Pin configuration for I2C interface 1.pinSDA = Board_I2C0_SDA1,.pinSCL = Board_I2C0_SCL1
};
void My_I2cinit();bool BoardI2C_readReg(uint8_t addr, uint8_t *pBuf, uint8_t nBytes);
bool BoardI2C_writeReg(uint8_t addr, uint8_t *pBuf, uint8_t nBytes);
bool BoardI2C_read(uint8_t *data, uint8_t len);
bool BoardI2C_write(uint8_t *data, uint8_t len);
uint8_t AD_RD_Reg(uint8_t addr);
void AD_WR_Reg(uint8_t addr,uint8_t val);
/**======== mainThread ========*/
void *mainThread(void *arg0)
{/* Call driver init functions */Display_init();GPIO_init();I2C_init();/* Open the HOST display for output */display = Display_open(Display_Type_UART, NULL);if (display == NULL) {while (1);}/* Turn on user LED */GPIO_write(Board_GPIO_LED0, Board_GPIO_LED_ON);Display_printf(display, 0, 0, "Starting the example\n");My_I2cinit();if(AD_RD_Reg(DEVICE_ID)==0X68) //读取器件ID{Display_printf(display, 0, 0, "ok!!!!!!\n");}return (NULL);
}
void My_I2cinit()
{/* Create I2C for usage */I2C_Params_init(&i2cParams);i2cParams.bitRate = I2C_400kHz;i2cParams.custom=(uintptr_t)&pinCfg1;i2cHandle = I2C_open(Board_I2C_TMP, &i2cParams);if (i2cHandle == NULL) {Display_printf(display, 0, 0, "Error Initializing I2C\n");while (1);}else{Display_printf(display, 0, 0, "Initializing I2C\n");}}
bool BoardI2C_write(uint8_t *data, uint8_t len)
{I2C_Transaction masterTransaction;masterTransaction.writeCount= len;masterTransaction.writeBuf= data;masterTransaction.readCount= 0;masterTransaction.readBuf= NULL;masterTransaction.slaveAddress = slaveAddr;return I2C_transfer(i2cHandle, &masterTransaction) == TRUE;
}/*******************************************************************************
* @fnBoardI2C_writeSingle
*
* @briefSingle byte write to an I2C device
*
* @paramdata - byte to write
*
* @returntrue if success
*/
bool BoardI2C_writeSingle(uint8_t data)
{uint8_t d;d = data;return BoardI2C_write(&d, 1);
}/*******************************************************************************
* @fnBoardI2C_read
*
* @briefBurst read from an I2C device
*
* @paramdata - pointer to data buffer
* @paramlen - number of bytes to write
*
* @returntrue if success
*/
bool BoardI2C_read(uint8_t *data, uint8_t len)
{I2C_Transaction masterTransaction;masterTransaction.writeCount = 0;masterTransaction.writeBuf = NULL;masterTransaction.readCount = len;masterTransaction.readBuf = data;masterTransaction.slaveAddress = slaveAddr;return I2C_transfer(i2cHandle, &masterTransaction) == TRUE;
}/*******************************************************************************
* @fnBoardI2C_writeRead
*
* @briefBurst write/read from an I2C device
*
* @paramwdata - pointer to write data buffer
* @paramwlen - number of bytes to write
* @paramrdata - pointer to read data buffer
* @paramrlen - number of bytes to read
*
* @returntrue if success
*/
bool BoardI2C_writeRead(uint8_t *wdata, uint8_t wlen, uint8_t *rdata, uint8_t rlen)
{I2C_Transaction masterTransaction;masterTransaction.writeCount = wlen;masterTransaction.writeBuf = wdata;masterTransaction.readCount = rlen;masterTransaction.readBuf = rdata;masterTransaction.slaveAddress = slaveAddr;if(I2C_transfer(i2cHandle, &masterTransaction) == TRUE){return 1;}else{return 0;}
}/*******************************************************************************
* @fnBoardI2C_readReg
*
* @briefThis function implements the I2C protocol to read from a sensor.
*The sensor must be selected before this routine is called.
*
* @paramaddr - which register to read
* @parampBuf - pointer to buffer to place data
* @paramnBytes - number of bytes to read
*
* @returnTRUE if the required number of bytes are received
******************************************************************************/
bool BoardI2C_readReg(uint8_t addr, uint8_t *pBuf, uint8_t nBytes)
{return BoardI2C_writeRead(&addr,1,pBuf,nBytes);
}/*******************************************************************************
* @fnBoardI2C_writeReg
* @briefThis function implements the I2C protocol to write to a sensor.
*The sensor must be selected before this routine is called.
*
* @paramaddr - which register to write
* @parampBuf - pointer to buffer containing data to be written
* @paramnBytes - number of bytes to write
*
* @returnTRUE if successful write
*/
bool BoardI2C_writeReg(uint8_t addr, uint8_t *pBuf, uint8_t nBytes)
{uint8_t i;uint8_t *p = buffer;/* Copy address and data to local buffer for burst write */*p++ = addr;for (i = 0; i < nBytes; i++){*p++ = *pBuf++;}nBytes++;/* Send data */return BoardI2C_write(buffer,nBytes);
}
void AD345_WR_Reg(uint8_t addr,uint8_t val)
{BoardI2C_writeReg(addr,&val,1);
}uint8_t AD_RD_Reg(uint8_t addr)
{uint8_t temp=0;BoardI2C_readReg(addr,&temp,1);return temp;//返回读到的值
}这个程序是我写的一个小demo,你可以参考一下.

Eggsy Pang：

I2C地址是7位的，不存在0x80. 你会不会想输入的是0x40吧