seeed Azure Sphere MT3620 + Grove Shield I2C Scanner

i2cScanner.c

#include "../../MT3620_Grove_Shield_Library/HAL/GroveI2C.h" // for SC18IM700_ReadReg
#include "../../MT3620_Grove_Shield_Library/HAL/GroveUART.h" // for GroveUART_Write

#include <stdlib.h> // for NULL
#include <time.h> // for nanosleep + timespec

#include <applibs/log.h> // for Log_Debug

// SC18IM700 data sheet:
// https://www.nxp.com/docs/en/data-sheet/SC18IM700.pdf

void i2cScanner(int i2cFd) {
    uint8_t i2cState;
    const struct timespec sleepTime = {0, 10000000};
    
    for (uint8_t addr = 1; addr < 127; addr++) {
        uint8_t send[4];
        // See "Write N bytes to slave device" in SC18IM700 data sheet
        send[0] = 'S'; // start byte
        send[1] = (uint8_t)((addr << 1) & 0xfe);
        send[2] = (uint8_t)0; // no data, i.e. size = 0
        send[3] = 'P'; // end byte
        
        Log_Debug("0x%02X ", addr);
        GroveUART_Write(i2cFd, send, (int)sizeof(send));
        Log_Debug("W");
        SC18IM700_ReadReg(i2cFd, 0x0A /* SC18IM700 I2C status register */, &i2cState);
        Log_Debug("R");
        if (i2cState == I2C_OK) {
            Log_Debug(" = I2C_OK\r\n");
        } else if (i2cState == I2C_TIME_OUT) {
            Log_Debug(" = I2C_TIME_OUT\r\n");
        } else if (i2cState == I2C_NACK_ON_ADDRESS) {
            Log_Debug(" = I2C_NACK_ON_ADDRESS\r\n");
        } else if (i2cState == I2C_NACK_ON_DATA) {
            Log_Debug(" = I2C_NACK_ON_DATA\r\n");
        }
        
        nanosleep(&sleepTime, NULL);
    }
}