[参考译文] CC3220SF-LAUNCHXL：无法从基于 SPI 的外部 EEPROM 25LC1024写入或读取数据

您好、Avi：

您能解释一下您 到底想要实现什么吗？

我想使用 SimpleLink CC3220SF Launch Pad 实现外部 EEPROM 写入/读取操作。

您当前遇到什么问题？  [/报价]

问题在于读取写入和读取未发生。

为什么要运行 回送？

仅用于测试传输的数据会通过 SPI 完全或不完全传输。 回送与 EEPROM 写入/读取操作无关。

 在控制器端再次向 SPI 转接添加另一个呼叫。

我无法理解上述陈述。

您 使用控制器 TX 上的相同数据调用 SPI 传输两次。 [/报价]

下面的说明解决了我的问题。

Yuejin Li 说：

strncpy ((char *) controllerTxBuffer、tmp_txBuffer、sizeof (SPI_MSG_LENGTH)；此 字符串复制指令从 tmp_txBuffer 将数据的一部分复制到 controllerTxBuffer (即、仅复制读取或写入指令)、 因此不会使用以下指令复制数据的其余部分)
memcpy (controllerTxBuffer、tmp_txBuffer、sizeof (tmp_txBuffer)/ sizeof (tmp_txBuffer[0])；
可以解决该问题。

以下代码可以解决我的问题：

SPI_Handle Init_SPI(void){
    SPI_Params      spiParams;
    printf("SPI initiating\n");
    SPI_init();  // Initialize the SPI driver
    SPI_Params_init(&spiParams);  // Initialize SPI parameters
    spiParams.dataSize = 8;       // 8-bit data size
    spiParams.frameFormat = SPI_POL0_PHA0;
    spiParams.bitRate     = 1000000;
    controllerSpi = SPI_open(CONFIG_SPI_0, &spiParams);
    if (controllerSpi == NULL)
        {
            printf("Error initializing controller SPI\n");
        }
        else
        {
            printf("Controller SPI initialized\n");
        }
    return controllerSpi;
}
int EEPROM_WriteLatch(void){
    SPI_Transaction spiTransaction;
    bool            transferOK;
    uint8_t tmp_txBuffer[SPI_MSG_LENGTH];
    tmp_txBuffer[0] = EEPROM_WRITE_ENABLE;          // EEPROM write enable latch
    spiTransaction.count = 1;
    memcpy(controllerTxBuffer, tmp_txBuffer, sizeof(tmp_txBuffer) / sizeof(tmp_txBuffer[0]));
    spiTransaction.txBuf = (void *)controllerTxBuffer;
    spiTransaction.rxBuf = NULL;
    SPI_transfer(controllerSpi, &spiTransaction);
    transferOK = SPI_transfer(controllerSpi, &spiTransaction);
    if (transferOK)
    {
        printf("EEPROM is ready to write data\n");
        return 0;
    }
    else
    {
        printf("Unsuccessful in Latching Write EEPROM\n");
        return -1;
    }
}

int writeToEEPROM(uint32_t address, uint8_t* data, uint32_t dataSize)
{
    EEPROM_WriteLatch();
    SPI_Transaction spiTransaction;
    bool            transferOK;
    uint8_t tmp_txBuffer[SPI_MSG_LENGTH];
    int i;
    printf("To write\n");

    tmp_txBuffer[0] = EEPROM_WRITE;                 // EEPROM write command
    tmp_txBuffer[1] = (address >> 16) & 0xFF;       // Address MSB
    tmp_txBuffer[2] = (address >> 8) & 0xFF;        // Address middle byte
    tmp_txBuffer[3] = address & 0xFF;               // Address LSB
    tmp_txBuffer[4] = 0xAA;                         // data to be written to 25LC1024
    

    memcpy(controllerTxBuffer, tmp_txBuffer, sizeof(tmp_txBuffer) / sizeof(tmp_txBuffer[0]));
    memset((void *)controllerRxBuffer, 0, SPI_MSG_LENGTH);

    spiTransaction.count = SPI_MSG_LENGTH;
    spiTransaction.txBuf = (void *)controllerTxBuffer;
    spiTransaction.rxBuf = NULL;

    /* Toggle user LED, indicating a SPI transfer is in progress */
    GPIO_toggle(CONFIG_GPIO_LED_1);

    /* Perform SPI transfer */
    transferOK = SPI_transfer(controllerSpi, &spiTransaction);
    if (transferOK)
    {
        for(i = SPI_MSG_LENGTH -1 ; i > 3; i--){
        printf("Master transmitted data: %#X\n", *(char *)(controllerTxBuffer + i));
        }
        printf("bufr transmitted data: %#X\n", *(int *)(controllerTxBuffer + 4));
        printf("bufr address of transmitted data: %#X\n", controllerTxBuffer);
    }
    else
    {
        printf("Unsuccessful controller SPI transfer");
        return -1;
    }
    return 0;
}

int readFromEEPROM(uint32_t address, uint8_t* receiveBuffer, uint32_t dataSize)
{
    printf("To read\n");

    /* Prepare the read command and address */
    SPI_Transaction spiTransaction;
    bool            transferOK;
    uint8_t tmp_txBuffer[SPI_MSG_LENGTH];
    int i;
    tmp_txBuffer[0] = EEPROM_READ;                  // Read command
    tmp_txBuffer[1] = (address >> 16) & 0xFF;       // Address MSB
    tmp_txBuffer[2] = (address >> 8) & 0xFF;        // Address middle byte
    tmp_txBuffer[3] = address & 0xFF;               // Address LSB
    tmp_txBuffer[4] = 0xBB;                         // dummy data
    
    memcpy(controllerTxBuffer, tmp_txBuffer, sizeof(tmp_txBuffer) / sizeof(tmp_txBuffer[0]));
    memset((void *)controllerRxBuffer, 0,SPI_MSG_LENGTH);
    spiTransaction.count = sizeof(tmp_txBuffer) / sizeof(tmp_txBuffer[0]);    // Read command + address + dummy data to transmit while receiving
    spiTransaction.txBuf = (void *)controllerTxBuffer;
    spiTransaction.rxBuf = (void *)controllerRxBuffer;

    /* Toggle user LED, indicating a SPI transfer is in progress */
    GPIO_toggle(CONFIG_GPIO_LED_1);

    /* Perform SPI transfer */
    transferOK = SPI_transfer(controllerSpi, &spiTransaction);
    if (transferOK)
    {
        for(i = SPI_MSG_LENGTH -1 ; i > 3; i--){
        printf("Master received data: %#X\n", *(char *)(controllerRxBuffer + i));
        }
        printf("bufr received data: %#X\n", *(int *)(controllerRxBuffer + 4));
        printf("bufr address of received data : %#X\n", controllerRxBuffer);
    }
    else
    {
        printf("Unsuccessful controller SPI transfer");
        return -1;
    }
    return 0;
}

感谢您在启动外部 EEPROM 25LC1024读写操作时的耐心和持续支持 Avi E.。

谢谢。此致、

Ajaykumar V

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