AM2632: AM2632 IIC

Hi ZX, 

If you slow down the bit rate to 100kbps, are you able to read?

Regards,

Brennan

Hi Brennan：

I have tried 100K, but it still shows the same phenomenon. The slave supports up to 1M clock speed

Best regards

zx

Hi ZX,

Your sysconfig and hardware configurations look correct. I am adding a software expert to this thread for further investigation.

It would help if you can provide some details about your code. 

Regards,

Brennan

Hi  Brennan：

Here is my code，I made some modifications to the routine example of sdk

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#include <drivers/i2c.h>
#include <kernel/dpl/DebugP.h>
#include "ti_drivers_config.h"
#include "ti_drivers_open_close.h"
#include "ti_board_open_close.h"


extern uint32_t Board_i2cGetEepromDeviceAddr(void);
#define I2C_READ_LEN                    (6U)

static void i2c_read_error_handler(uint16_t sample, int32_t status);

void i2c_read_main(void *arg0)
{
    uint16_t        sample;
    int32_t         status;
    uint32_t        i2cReadTargetAddr;
    uint8_t         rxBuffer[I2C_READ_LEN];
    uint8_t         txBuffer[2];
    I2C_Handle      i2cHandle;
    I2C_Transaction i2cTransaction;

    Drivers_open();
    Board_driversOpen();

    i2cReadTargetAddr     = 0x44;//Board_i2cGetEepromDeviceAddr();
    i2cHandle = gI2cHandle[CONFIG_I2C0];

    DebugP_log("[I2C] Read data ... !!!\r\n");

    /* Set default transaction parameters */
    I2C_Transaction_init(&i2cTransaction);
    i2cTransaction.writeBuf      = txBuffer;
    i2cTransaction.readBuf      = rxBuffer;
    i2cTransaction.writeCount    = 2;
    i2cTransaction.readCount    = 1;
    i2cTransaction.targetAddress = i2cReadTargetAddr;
    txBuffer[0] = 0x24;
    txBuffer[1] = 0x16;

    status = I2C_transfer(i2cHandle, &i2cTransaction);

    I2C_Transaction_init(&i2cTransaction);
    /* Override with required transaction parameters */
    i2cTransaction.readBuf      = rxBuffer;
    i2cTransaction.readCount    = I2C_READ_LEN;
    i2cTransaction.targetAddress = i2cReadTargetAddr;

    /* Read 20 samples and log them */
    // for(sample = 0; sample < 20; sample++)
    // {
        status = I2C_transfer(i2cHandle, &i2cTransaction);
        if(status == I2C_STS_SUCCESS)
        {
            DebugP_log("[I2C] Sample %u: %u\r\n", sample, rxBuffer[0]);
        }
        else
        {
            i2c_read_error_handler(sample, i2cTransaction.status);
        }
    // }

    DebugP_log("[I2C] Read data ... DONE !!!\r\n");
    if(status == SystemP_SUCCESS)
    {
        DebugP_log("All tests have passed!!\r\n");
    }
    else
    {
        DebugP_log("Some tests have failed!!\r\n");
    }

    Board_driversClose();
    Drivers_close();

    return;
}

static void i2c_read_error_handler(uint16_t sample, int32_t status)
{
    switch(status)
    {
        case I2C_STS_ERR:
            DebugP_logError("[I2C] Sample %u: Generic error occurred", sample);
            break;
        case I2C_STS_ERR_TIMEOUT:
            DebugP_logError("[I2C] Sample %u: Timeout error occurred", sample);
            break;
        case I2C_STS_ERR_NO_ACK:
            DebugP_logError("[I2C] Sample %u: No acknowledgement received", sample);
            break;
        case I2C_STS_ERR_ARBITRATION_LOST:
            DebugP_logError("[I2C] Sample %u: Arbitration lost", sample);
            break;
        case I2C_STS_ERR_BUS_BUSY:
            DebugP_logError("[I2C] Sample %u: Bus Bus Busy error occurred", sample);
            break;
    }

    return;
}

Looking forward to your reply

zx

Hi ZX,

From my initial analysis I have a few points:

1. In your code, I see that after the I2C Write operation, you call the "I2C_Transaction_init()" function and populate 3 parameters (Targer address, readBufa nd ReadCount). The other parameters such as Timeout, Controller mode, status and other args take default values as shown below

Make sure the I2C Transaction structure is configured correctly before you call the Read operations

2. I understand why the I2C_READ_LEN was changed to "6", but according to the datasheet of the sensor, master should send ACK after each of the first 5B are received and STOP command after the 6th Byte. Can you verify if this is happening? The Logic analyzer capture is not opening in a high resolution for me so I could not look closely.

3. I see no issues in the code, I believe we are missing some step in terms of performing read operation correctly. 

Regards,
Shaunak

Hi Shaunak:

Thanks for you reply.

1. I referred to multiple routines, which only configured the Targer address, readBufa nd ReadCount， I followed his instructions, and I have also configured Timeout before, but I did not read the data properly. Is it better to use the default parameters for other parameters

2. The current problem is that when reading, after sending the slave address, the clk terminates and becomes low

Regards 

zx

Hi Shaunak:

There is only one slave on my IIC bus。

I want to know if this phenomenon is caused by the host actively pulling down，and why

Thanks

ZX

Hi Shaunak:

  Sorry, I misunderstood. I mistakenly configured 'Own Target Address' as slave address.

  I have corrected the configuration and will conduct thorough testing to verify the functionality. I will promptly share the test results with you once completed.

Thank you again for your patience and support

zx

Hi Shaunak:

I fixed this by changing the address.

Thanks for your help

zx