Hi,

I try to test I2C sample cyfxusbi2cregmode with FX3 dev board and Atmel 24C64 EEPROM inserted to U44.

The problem is that it does not work (I2C Transmit Bytes failed, Error Code = 74).

I changed in .h file the following:

#define CY_FX_USBI2C_I2C_MAX_CAPACITY   (8*1024)

#define CY_FX_USBI2C_I2C_PAGE_SIZE   (32)

#define CY_FX_USBI2C_I2C_SLAVE_ADDRESS  (0xE)

On FX3 dev board all SW40 switches are away from "ON" text, so most likely this means that we have A0=1, A1=1, A2=1.

I assumed that in binary form preamble.buffer[0] parameter is created in the following way:

0 0 0 0 A2 A1 A0 RW => 00001110 => 0xE.

But this does not work. What may be wrong and how to make it work ?

Thanks.

The address of EEPROM used is wrong. Please look at page 11 of the datasheet http://www.atmel.com/dyn/resources/prod_documents/doc0336.pdf

Regards,

Anand

Changed address to 0xAE (10101110), but the result is the same - error 74.

Also I tried to create separate sample (based on cyfxisolpmaninout) for testing I2C EEPROM, but it also does not work (nor  CyU3PI2cReceiveBytes, nor CyU3PI2cTransmitBytes, nor CyU3PI2cWaitForAck).

#define CY_FX_USBI2C_I2C_BITRATE        (100000)

#define CY_FX_USBI2C_I2C_TIMEOUT        (0xFFFFFFFF)

{

    CyU3PReturnStatus_t apiRetStatus;

    uint32_t txApiRetStatus;

    CyU3PI2cConfig_t i2cConfig;

    txApiRetStatus = CyU3PEventCreate(&glAppEvent);

    if (txApiRetStatus != 0)

        CyU3PDebugPrint (4, "Iso Loop Appln Create Event failed, Error Code = %d\n",txApiRetStatus);

    apiRetStatus = CyU3PI2cInit();

    if (apiRetStatus != 0)

    AppErrorHandler(4, "I2C Init failed, Error Code = %d.\r\n",apiRetStatus);

    else

    CyU3PDebugPrint(4, "CyU3PI2cInit; OK;\r\n");

    i2cConfig.bitRate = CY_FX_USBI2C_I2C_BITRATE;

    i2cConfig.busTimeout = CY_FX_USBI2C_I2C_TIMEOUT;

    i2cConfig.isDma = CyFalse; // Use register mode

    i2cConfig.dmaTimeout = 0xFFFF;

    apiRetStatus = CyU3PI2cSetConfig(&i2cConfig, NULL);

    if (apiRetStatus != 0)

    AppErrorHandler(4, "I2C Set Config failed, Error Code = %d.\r\n",apiRetStatus);

    else

    CyU3PDebugPrint(4, "CyU3PI2cSetConfig; OK;\r\n");

    int tmp_addr;

    CyU3PI2cPreamble_t preamble;

    tmp_addr = 0xAE;

preamble.buffer[0] = tmp_addr;

preamble.buffer[1] = 0; // address 0

preamble.buffer[2] = 0; // address 0

preamble.buffer[3] = tmp_addr | 0x1; // slave address; read

preamble.length = 4;

preamble.ctrlMask = 0x0004;

apiRetStatus = CyU3PI2cReceiveBytes (&preamble, tmp_i2c_test_buf, tmp_i2c_test_buf_len, 10);

//preamble.length = 1;

//apiRetStatus = CyU3PI2cWaitForAck (&preamble, 1);

if (apiRetStatus == CY_U3P_SUCCESS)

CyU3PDebugPrint (4, "*** OK or 0 bytes.\r\n");

else

CyU3PDebugPrint (4, "*** Failed to read from I2C EEPROM. Error Code = %d.\r\n",apiRetStatus);

    /* Start the USB functionality */

    apiRetStatus = CyU3PUsbStart();

    if (apiRetStatus != CY_U3P_SUCCESS)

        AppErrorHandler(4, "USB Function Failed to Start.\r\n", apiRetStatus);

You can use the possible error code return documented for each API in the API user guide and the header file cyu3i2c.h to understand the reason behind the issue.

In your case 74 0x4A seems to be related to NAK, transfer failed etc. Is it possible to probe the I2C lines to see what exactly is happening on it?

Regards,

Anand

 The problem was in J42, J45 jumpers. Now I2C EEPROM read/write is ok, but still cannot boot with custom VID/PID.