Hello All,
I have interfaced I2C port 2 with Temperature sensor (Si7050/3/4/5-A20 device name) on TM4C129xnczad. I am using TI-RTOS I2C driver.
TO measure the temperature i am sending the command 0xE3 as per datasheet. The datasheet you can download through website just type the part number i mentioned.
The code which i am writing is mentioned below:
for I2C init:
I2C_Params_init(&i2cParams);
i2cParams.bitRate = I2C_100kHz;
i2cParams.transfermode = I2C_MODE_BLOCKING;
i2c = I2C_open(0, &i2cParams);
txBuffer[0] = 0xE3; /* Command to measure temperature */
i2cTransaction.slaveAddress = 0x40;
i2cTransaction.writeBuf = txBuffer;
i2cTransaction.writeCount = 1;
i2cTransaction.readBuf = rxBuffer;
i2cTransaction.readCount = 3;
if (I2C_transfer(i2c, &i2cTransaction))
{
temp = (rxBuffer[0] << 8) | (rxBuffer[1]);
}
What happens is sometimes it will work and sometimes it will not. So i tried to find out the reason why it is happening.
Later i identified is that whenever i am not getting data Arbitration lost happened i.e. I2C_MCS register set the ARBLST.
I don't understand why it is behaving in that manner.
As i mentioned sometimes it will work. This happens many times so not able to identify the exact reason for this.
Please help me out to solve this problem.
Thanks
Sanyam Agarwal
