I2C operation

[!Note]

1. Currently only SV50P series modulessupport this function.
2. Before use, you need to enable the TWI function in Module Configuration, and upgrade with the new system package generated before it can be used normally.
3. MoreUsage Tutorialabout modules.

Introducing header files

  #include "utils/I2CHelper.h"

Specific operations

  #include "utils/I2CHelper.h"

  #define CFG_L        0x47
  #define CFG_H        0x80
  #define VER_L        0x41
  #define VER_H        0x81

  static void testI2C() {
    uint8_t tx[512], rx[512];
    memset(tx, 0, 512);
    memset(rx, 0, 512);

    /**
     * Define variables
     * 
     * Parameter 1: i2c bus number
     * Parameter 2: Slave address, be sure to pay        attention to the 7bit address
     * Parameter 3: Timeout time, unit: ms
     * Parameter 4: Number of retries: ms
     */
    I2CHelper i2c(0, 0x5e, 1000, 5);

    tx[0] = CFG_H;
    tx[1] = CFG_L;

    /**
     * Simplex writing
     *
     * Parameter 1: Write data address
      * Parameter 2: Data length
     */
    if (!i2c.write(tx, 2)) {
        LOGD("i2c tx cfg error!\n");
    }

    /**
     * Single work
     *
     * Parameter 1: Read data address
     * Parameter 2: Data length
     */
    if (!i2c.read(rx, 1)) {
        LOGD("i2c rx cfg error!\n");
    }

    LOGD("i2c reg[0x%x%x]=%x\n", CFG_H, CFG_L, rx[0]);
    memset(rx, 0, 512);

    /**
    * Half-duplex transmission, that is, shared     read and write, no stop signal in the middle
    *
    * Parameter 1: Write data address
    * Parameter 2: Write data length
    * Parameter 3: Read data address
    * Parameter 4: Read data length
     */
    if (!i2c.transfer(tx, 2, rx, 1)) {
        LOGD("i2c i2c_transfer cfg error!\n");
    }

    LOGD("i2c reg[0x%x%x]=%x\n", CFG_H, CFG_L, rx[0]);

    tx[0] = VER_H;
    tx[1] = VER_L;
    if (!i2c.write(tx, 2)) {
        LOGD("i2c tx ver error!\n");
    }

    if (!i2c.read(rx, 1)) {
        LOGD("i2c rx ver error!\n");
    }

    LOGD("i2c reg[0x%x%x]=%x\n", VER_H, VER_L, rx[0]);
    memset(rx, 0, 512);
    if (!i2c.transfer(tx, 2, rx, 1)) {
        LOGD("twi i2c_transfer ver error!\n");
    }

    LOGD("i2c reg[0x%x%x]=%x\n", VER_H, VER_L, rx[0]);
  }

For other interface operations, please refer to the header file notes.