I2C Assert while Reading Slave-Device

[rapper2000]

1. SDK version（SDK 版本）

{ https://github.com/ZakKemble/GPRS_C_SDK }

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2. In what kind of operation problems appear, and how to reproduce the problem ?（什么样的操作步骤问题会出现，是否是稳定复现，如何复现问题？）

{ I have a basic I2C communication set up, that works fine. The problem is, that i'm reading a sequence of Registers from a slave device, and sometimes (even I can not get it to reproduce) the read fails with the following exception:

Assert received!! Reading detail... ASSERT DETAIL : I2C bus is not configured as used: 0

Tracer Log: [16:51:20.514] MMI 06 : Reading Register number 7 [16:51:20.514] MMI 06 : Entering read [16:51:20.514] MMI 06 : Entering open [16:51:20.514] : Fn 0577036 T1 0435 T2 18 T3 22 Time 00 00 52 864 [16:51:20.514] PAL 01 : ############################################## FATAL assert I2C bus is not configured as used: 0 ############################################## [16:51:20.514] SXR 01 : Stack found for Task\n [16:51:20.514] SXR 01 : Task 29: HTTP GPS Task Priority 233 [16:51:20.514] SXR 01 : is active.\n [16:51:20.514] SXR 01 : Stack 6312/16384 Top 0x82274a68 <- 0x82278a68\n [16:51:20.514] SXR 01 : Back trace\n [16:51:20.514] SXR 01 : 82005a25y\n [16:51:20.514] SXR 01 : 8200594cy\n [16:51:20.514] SXR 01 : 881d23bcy\n [16:51:20.514] SXR 01 : 82005a25y\n [16:51:20.514] SXR 01 : 82005a05y\n [16:51:20.514] SXR 01 : 881930efy\n [16:51:20.514] SXR 01 : 8200e409y\n [16:51:20.514] SXR 01 : 881930d5y\n [16:51:20.514] SXR 01 : 8819387dy\n [16:51:20.514] SXR 01 : 8809e119y\n [16:51:20.514] SXR 01 : 881c9110y\n [16:51:20.514] SXR 01 : 881c9110y\n [16:51:20.514] SXR 01 : 88193883y\n [16:51:20.514] SXR 01 : 88185ea7y\n

For all the preceding reads (~several hundred) it can work just fine, but then suddenly this error comes up, sometimes at the first reads, sometimes after several minutes of runtime....

I will attach some more code here

int ADXL345_getFIFO(XYZ_Point_t p[], uint16_t length)
{
    I2C_Error_t ret = 0;
    uint8_t regSave = '\x00';
    // Put Device in Standy
    ret = readI2C(ADXL345_REG_POWERCTL, &regSave, 1);
    uint8_t regBuf = regSave & ~ADXL345_PM_MEASURE;
    if (ret) {Trace(ADX_ET, "Failed to read from ADXL345 in getFIFO: read. Error in I2C: %2d", ret); return ret;}
    ret = writeI2C(ADXL345_REG_POWERCTL, &regBuf, 1);
    if (ret) {Trace(ADX_ET, "Failed to write to ADXL345 in getFIFO: write. Error in I2C: %2d", ret); return ret;}
    // Read FIFO (should be 32 Bytes long; read of 0x32 to 0x37 => corresponds to last 2560 ms...)
    int i = 0;
    for (i = length-1; i>=0; i--)
    {
        Trace(I2C_ET, "Reading Register number %d", i);
        ret = readI2C(ADXL345_REG_DATAX0, p[i].raw, 6);
        if (ret) {Trace(ADX_ET, "Failed to read from ADXL345 in getFIFO_for %d: read. Error in I2C: %2d", i, ret); return ret;}
    }
    ret = writeI2C(ADXL345_REG_POWERCTL, &regSave, 1);
    if (ret) {Trace(ADX_ET, "Failed to write to ADXL345 in getFIFO: write_save. Error in I2C: %2d", ret); return ret;}
    return 0;
};

I2C_Error_t writeI2C(uint32_t firstMemAddr, uint8_t * sendBuffer, uint16_t numberOfBytes)
{
    I2C_Error_t ret = I2C_ERROR_NONE;
    if (openI2C()) // Error in open if != I2C_ERROR_NONE (= 0)
    {
        Trace(I2C_ET, "Could NOT open I2C Nr. %d on A9G @ read.\nError was: %d", A9G_I2C_Class.id, ret);
    }
    Trace(I2C_ET, "Middle of write");
    ret = I2C_WriteMem(A9G_I2C_Class.id, A9G_I2C_Class.address, firstMemAddr, A9G_I2C_Class.addrBusWidth, sendBuffer, numberOfBytes, A9G_I2C_Class.timeout);
    if (closeI2C()) // Error in open if != I2C_ERROR_NONE (= 0)
    {
        Trace(I2C_ET, "Could NOT close I2C Nr. %d on A9G @ read.", A9G_I2C_Class.id);
    }
    Trace(I2C_ET, "Returning write");
    return ret;
}

I2C_Error_t readI2C(uint32_t firstMemAddr, uint8_t * recBuffer, uint16_t numberOfBytes)
{
    Trace(I2C_ET, "Entering read");
    I2C_Error_t ret = I2C_ERROR_NONE;
    if (openI2C()) // Error in open if != I2C_ERROR_NONE (= 0)
    {
        Trace(I2C_ET, "Could NOT open I2C Nr. %d on A9G @ read.\nError was: %d", A9G_I2C_Class.id, ret);
    }
    Trace(I2C_ET, "Got to middle of read");
    ret = I2C_ReadMem(A9G_I2C_Class.id, A9G_I2C_Class.address, firstMemAddr, A9G_I2C_Class.addrBusWidth, recBuffer, numberOfBytes, A9G_I2C_Class.timeout);
    Trace(I2C_ET, "Got to after read MEM");
    if (closeI2C()) // Error in open if != I2C_ERROR_NONE (= 0)
    {
        Trace(I2C_ET, "Could NOT close I2C Nr. %d on A9G @ read.", A9G_I2C_Class.id);
    }
    Trace(I2C_ET, "Returning");
    return ret;
}

I2C_Error_t openI2C(void)
{
    Trace(I2C_ET, "Entering open");
    switch(I2C_Init(A9G_I2C_Class.id, A9G_I2C_Class.config))
    {
        case true: Trace(I2C_ET, "Leaving Open"); return I2C_ERROR_NONE;
        default:   return I2C_ERROR_MAX;
    }

};
static I2C_Error_t closeI2C(void)
{
    Trace(I2C_ET, "Entering close");
    switch(I2C_Close(A9G_I2C_Class.id))
    {
        case true: Trace(I2C_ET, "Leaving Close"); return I2C_ERROR_NONE;
        default:   return I2C_ERROR_MAX;
    }

};

Thanks in advance :) }

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