[参考译文] CC1352P：回调模式下的 I2C 通信

https://e2e.ti.com/support/wireless-connectivity/sub-1-ghz-group/sub-1-ghz/f/sub-1-ghz-forum/1296485/cc1352p-i2c-communication-in-callback-mode

我主要在 blocking_mode 中使用 I2C、而对于我的应用、我需要使用它 callback_mode。 我希望确保正确实施回调和操作。 我已经修改了 i2ctmp.c 测试代码以使用回调功能。 我的行为是否正确？

/*
 *  ======== i2ctmp.c ========
 */
#include <stdint.h>
#include <stddef.h>
#include <unistd.h>

/* Driver Header files */
#include <ti/drivers/GPIO.h>
#include <ti/drivers/I2C.h>
#include <ti/display/Display.h>
#include <ti/sysbios/BIOS.h>
#include <ti/sysbios/knl/Semaphore.h>

/* Driver configuration */
#include "ti_drivers_config.h"

#define TASKSTACKSIZE 640

/* Temperature result registers */
#define TMP11X_RESULT_REG 0x0000

/* I2C target addresses */
#define TMP11X_BASSENSORS_ADDR 0x48
#define TMP116_LAUNCHPAD_ADDR  0x49

/* Number of supported sensor iterations */
#define TMP_COUNT 2

/*Testiing using the RV3028C7 */
#define DEVICE_ADDRESS 0x52
#define MANFACTURER_ID_REG 0x28

/*
 * Data structure containing currently supported I2C TMP sensors.
 * Sensors are ordered by descending preference.
 */
static const struct
{
    uint8_t address;
    uint8_t resultReg;
    char *id;
} sensors[TMP_COUNT] = {{TMP11X_BASSENSORS_ADDR, TMP11X_RESULT_REG, "11X"},
                        {TMP116_LAUNCHPAD_ADDR, TMP11X_RESULT_REG, "116"}};

static uint8_t targetAddress;
static Display_Handle display;

static void i2cErrorHandler(I2C_Transaction *transaction, Display_Handle display);

void someI2CCallbackFunction(I2C_Handle handle, I2C_Transaction *i2cTransaction, bool result);

Semaphore_Handle sem;
Semaphore_Params semParams;

/*
 *  ======== mainThread ========
 */
void *mainThread(void *arg0)
{
    uint16_t sample;
    int16_t temperature;
    uint8_t txBuffer[1];
    uint8_t rxBuffer[1];
    int8_t i;
    I2C_Handle i2c;
    I2C_Params i2cParams;
    I2C_Transaction i2cTransaction;



    Semaphore_Params_init(&semParams);
    sem = Semaphore_create(0, &semParams, NULL); /* Memory allocated in here */

    if (sem == NULL) /* Check if the handle is valid */
    {
        //System_abort("Semaphore could not be created");
        ;
    }

    /* Call driver init functions */
    Display_init();
    GPIO_init();
    I2C_init();

    /* Configure the LED and if applicable, the TMP_EN pin */
    GPIO_setConfig(CONFIG_GPIO_LED_0, GPIO_CFG_OUT_STD | GPIO_CFG_OUT_LOW);
#ifdef CONFIG_GPIO_TMP_EN
    GPIO_setConfig(CONFIG_GPIO_TMP_EN, GPIO_CFG_OUT_STD | GPIO_CFG_OUT_HIGH);
    /* Allow the sensor to power on */
    sleep(1);
#endif

    /* Open the UART display for output */
    display = Display_open(Display_Type_UART, NULL);
    if (display == NULL)
    {
        while (1) {}
    }

    /* Turn on user LED */
    GPIO_write(CONFIG_GPIO_LED_0, CONFIG_GPIO_LED_ON);
    Display_printf(display, 0, 0, "Starting the i2ctmp example\n");

    /* Create I2C for usage */
    I2C_Params_init(&i2cParams);
    i2cParams.bitRate = I2C_400kHz;
    i2cParams.transferMode = I2C_MODE_CALLBACK;
    //i2cParams.transferMode = I2C_MODE_BLOCKING;
    i2cParams.transferCallbackFxn = someI2CCallbackFunction;
    i2c               = I2C_open(CONFIG_I2C_TMP, &i2cParams);
    if (i2c == NULL)
    {
        Display_printf(display, 0, 0, "Error Initializing I2C\n");
        while (1) {}
    }
    else
    {
        Display_printf(display, 0, 0, "I2C Initialized!\n");
    }

    /*RV3028C7 Testing reading the Manufacterer ID*/
    txBuffer[0] = MANFACTURER_ID_REG;

    i2cTransaction.targetAddress = DEVICE_ADDRESS;
    i2cTransaction.writeBuf   = txBuffer;
    i2cTransaction.writeCount = 1;
    i2cTransaction.readBuf    = rxBuffer;
    i2cTransaction.readCount  = 1;

    while (1) {
     uint8_t data = 0;
     I2C_transfer(i2c, &i2cTransaction);

     data = rxBuffer[0];
     Display_printf(display, 0, 0, "Data %2x", data);



     //Wait for transfer to complete here
     Semaphore_pend(sem, BIOS_WAIT_FOREVER); // the timeout value can be changed

    }


    I2C_close(i2c);
    Display_printf(display, 0, 0, "I2C closed!");

    return (NULL);
}

/*
 *  ======== i2cErrorHandler ========
 */
static void i2cErrorHandler(I2C_Transaction *transaction, Display_Handle display)
{
    switch (transaction->status)
    {
        case I2C_STATUS_TIMEOUT:
            Display_printf(display, 0, 0, "I2C transaction timed out!");
            break;
        case I2C_STATUS_CLOCK_TIMEOUT:
            Display_printf(display, 0, 0, "I2C serial clock line timed out!");
            break;
        case I2C_STATUS_ADDR_NACK:
            Display_printf(display,
                           0,
                           0,
                           "I2C target address 0x%x not"
                           " acknowledged!",
                           transaction->targetAddress);
            break;
        case I2C_STATUS_DATA_NACK:
            Display_printf(display, 0, 0, "I2C data byte not acknowledged!");
            break;
        case I2C_STATUS_ARB_LOST:
            Display_printf(display, 0, 0, "I2C arbitration to another controller!");
            break;
        case I2C_STATUS_INCOMPLETE:
            Display_printf(display, 0, 0, "I2C transaction returned before completion!");
            break;
        case I2C_STATUS_BUS_BUSY:
            Display_printf(display, 0, 0, "I2C bus is already in use!");
            break;
        case I2C_STATUS_CANCEL:
            Display_printf(display, 0, 0, "I2C transaction cancelled!");
            break;
        case I2C_STATUS_INVALID_TRANS:
            Display_printf(display, 0, 0, "I2C transaction invalid!");
            break;
        case I2C_STATUS_ERROR:
            Display_printf(display, 0, 0, "I2C generic error!");
            break;
        default:
            Display_printf(display, 0, 0, "I2C undefined error case!");
            break;
    }
}


void someI2CCallbackFunction(I2C_Handle handle, I2C_Transaction *i2cTransaction, bool result) {
 if (result) {
  // transfer completed successfully
  // Data is stored in i2cTransaction



  // Notify task that transfer is complete here (semaphore or event)
   Semaphore_post(sem);
 } else {
  // error occurred
 }
}