最简 INA226 写寄存器的代码

#include "hardware/i2c.h"
#include "pico/binary_info.h"
#define I2C_SDA 16
#define I2C_SCL 17

void setup() {
  // put your setup code here, to run once:
  Serial.begin( 115200 );
  i2c_init( i2c_default, 100*1000 );
  gpio_set_function(I2C_SDA, GPIO_FUNC_I2C);
  gpio_set_function(I2C_SCL, GPIO_FUNC_I2C);
  gpio_pull_up(I2C_SDA);
  gpio_pull_up(I2C_SCL);
  bi_decl(bi_2pins_with_func(I2C_SDA, I2C_SCL,GPIO_FUNC_I2C));

    uint8_t registerid = 0x00;
    uint16_t value = 0x4527;

    uint8_t data[3];
    data[0] = 0x00;
    data[1] = value >> 8;
    data[2] = value & 0x00ff;    

    i2c_write_blocking(i2c_default, 0x40, data, sizeof(data), true );

  for( ;; )
  {

    value = 0;

    i2c_write_blocking(i2c_default, 0x40, & registerid, sizeof(registerid), true );
    i2c_read_blocking (i2c_default, 0x40, (uint8_t *) & value, sizeof(value), false );

    value = value >> 8 | value << 8;

    Serial.printf( "%X\n", value );
  }

}

改写 0x00 寄存器的初始值，并获取打印这个寄存器的值。