DevLab_ICM20948.cpp

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#include "DevLab_ICM20948.h"
 
/** - Construct with default I2C address; call begin() to attach bus */
DevLab_ICM20948::DevLab_ICM20948() {}
 
bool DevLab_ICM20948::beginI2C(uint8_t address, TwoWire &i2cPort, uint32_t i2cSpeed)
{
  // Free previous BusIO instance 
  if (bus)
  {
    delete bus;
    bus = nullptr;
  }
 
  // Assign I2C interface implementation
  iface = &i2c;
 
  // Initialize I2C (400kHz) and probe device
  if (!i2c.beginI2C(address, i2cPort, i2cSpeed))
    return false;
 
  // Create BusIO abstraction layer
  bus = new BusIO_7Semi<Interface_7Semi>(*iface);
  if (!bus)
    return false;
 
  // Allow device to stabilize after power-up
  delay(100);
 
  // Read WHO_AM_I register
  uint8_t who_am_i;
  if (!readWhoAmI(who_am_i))
    return false;
 
  // Validate device ID (expected 0xEA)
  if (who_am_i != WHO_AM_I_VAL)
    return false;
 
  if (!selectBank(2))
    return false;
 
  if (!bus->write(ODR_ALIGN_EN, (uint8_t)0x01))
    return false;
 
  if (!selectBank(0)) return false;
 
  /*In case of error substitute the following code with the previous one
  if (!bus->writeBit(USER_CTRL, 4, (uint8_t)0x00))
  return false;
  */
  // Enable I2C interface (I2C_IF_DIS = 0)
  if (!bus->write(USER_CTRL, (uint8_t)0x00))
  return false;
 
  // Set clock source to PLL (auto select best clock)
  if (!bus->write(PWR_MGMT_1, (uint8_t)0x01))
    return false;
 
  if(!applyBasicDefaults())
    return false;
 
  // Initialization successful
  return true;
}
 
bool DevLab_ICM20948::beginSPI(uint8_t csPin, SPIClass &spiPort, uint32_t spiSpeed)
{
// Free previous BusIO instance 
  if (bus)
  {
    delete bus;
    bus = nullptr;
  }
 
  // Assign SPI interface implementation
  iface = &spi;
  
  // Initialize SPI (1MHz) and probe device
  if (!spi.beginSPI(csPin, spiPort, spiSpeed))
    return false;
 
  // Create BusIO abstraction layer
  bus = new BusIO_7Semi<Interface_7Semi>(*iface);
  if (!bus)
    return false;
 
    softReset();
 
  // Allow device to stabilize after power-up
  delay(100);
 
 
  // Read WHO_AM_I register
  uint8_t who_am_i;
 
  if (!readWhoAmI(who_am_i))
    return false;
 
  // Validate device ID (expected 0xEA)
  if (who_am_i != WHO_AM_I_VAL)
    return false;
 
  if (!selectBank(2))
    return false;
 
  if (!bus->write(ODR_ALIGN_EN, (uint8_t)0x01))
    return false;
 
  if (!selectBank(0)) 
    return false;
  // Enable I2C interface (I2C_IF_DIS = 0)
 
if (!bus->writeBit(USER_CTRL, 4, (uint8_t)1)) return false;
 
  Serial.println("I2C interface enabled");
  // Wake device from sleep mode (SLEEP = 0)
  if (!bus->write(PWR_MGMT_1,(uint8_t)0x01))
    return false;
 
  if(!applyBasicDefaults())
    return false;
 
  // Initialization successful
  return true;
}
 
bool DevLab_ICM20948::readWhoAmI(uint8_t &whoAmI)
{
  // Select USER BANK 0
  if (!selectBank(0))
    return false;
 
  // Read WHO_AM_I register
  if (!bus->read(WHO_AM_I, whoAmI))
    return false;
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::selectBank(uint8_t bank)
{
  if (bank > 3)
    return false;
 
  // Mask bank value to valid range (0–3) and shift to bits [5:4]
  uint8_t v = (bank & 0x03) << 4;
 
  // Write bank selection to REG_BANK_SEL register
  return bus->write(REG_BANK_SEL, v);
}
 
bool DevLab_ICM20948::softReset()
{
  // Select USER BANK 0
  if (!selectBank(0))
    return false;
 
  // Set DEVICE_RESET bit (bit 7)
  if (!bus->write(PWR_MGMT_1, (uint8_t)0x80))
    return false;
 
  // Allow device to reset
  delay(100);
 
  selectBank(2);
  bus->write(ODR_ALIGN_EN, (uint8_t)0x01);
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::sleep(bool en)
{
  // Select USER BANK 0
  if (!selectBank(0))
    return false;
 uint8_t v = 1;
    if(en)
   v|= 1<<6;
 
  // Set or clear SLEEP bit (bit 6)
  if (!bus->write(PWR_MGMT_1, v))
    return false;
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::applyBasicDefaults()
{
  // Select USER BANK 0
  if (!selectBank(0))
    return false;
 
  // Wake device and set clock source (CLKSEL=1, SLEEP=0)
  if (!bus->write(PWR_MGMT_1, (uint8_t)0x01))
    return false;
 
  if (!bus->write(PWR_MGMT_2, (uint8_t)0x00))
    return false;
 
 
  // Allow device to stabilize
  delay(10);
 
  // Disable duty-cycling (LP mode off)
  if (!bus->write(LP_CONFIG, (uint8_t)0x00))
    return false;
 
  // Select USER BANK 2
  if (!selectBank(2))
    return false;
 
  // Configure gyro (DLPF enabled, FS = 2000 dps)
  if (!bus->write(GYRO_CONFIG_1, (uint8_t)0x1F))
    return false;
 
  // Set gyro sample rate divider (SRD = 0 → max rate)
  if (!bus->write(GYRO_SMPLRT_DIV, (uint8_t)0x00))
    return false;
 
  // Configure accel (DLPF enabled, FS = 2g)
  if (!bus->write(ACCEL_CONFIG, (uint8_t)0x19))   //Change to 0x1F for 16g
    return false;
 
  // Set accel sample rate divider high byte
  if (!bus->write(ACCEL_SMPLRT_DIV_1, (uint8_t)0x00))
    return false;
 
  // Set accel sample rate divider low byte
  if (!bus->write(ACCEL_SMPLRT_DIV_2, (uint8_t)0x00))
    return false;
 
  // Select USER BANK 0
  if (!selectBank(0))
    return false;
 
  // Configure interrupt pin (open-drain, active-low, latch)
  if (!bus->write(INT_PIN_CFG, (uint8_t)0x30))
    return false;
 
  // Configuration successful
  return true;
}
 
bool DevLab_ICM20948::readAccel(float &x, float &y, float &z)
{
  // Select USER BANK 0
  if (!selectBank(0))
    return false;
 
  // Read 6 bytes (X, Y, Z)
  uint8_t raw[6];
  if (!bus->read(ACCEL_XOUT_H, raw, 6))
    return false;
 
  // Convert raw data to g
  x = (int16_t)((raw[0] << 8) | raw[1]) / mg_per_lsb;
  y = (int16_t)((raw[2] << 8) | raw[3]) / mg_per_lsb;
  z = (int16_t)((raw[4] << 8) | raw[5]) / mg_per_lsb;
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::readGyro(float &x, float &y, float &z)
{
  // Select USER BANK 0
  if (!selectBank(0))
    return false;
 
  // Read 6 bytes (X, Y, Z)
  uint8_t raw[6];
  if (!bus->read(GYRO_XOUT_H, raw, 6))
    return false;
 
  // Convert raw data to dps
  x = (int16_t)((raw[0] << 8) | raw[1]) / degree_per_second;
  y = (int16_t)((raw[2] << 8) | raw[3]) / degree_per_second;
  z = (int16_t)((raw[4] << 8) | raw[5]) / degree_per_second;
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::readTemperature(float &temperature)
{
  // Select USER BANK 0
  if (!selectBank(0))
    return false;
 
  // Initialize accumulator
  temperature = 0;
 
  // Read and average 5 samples
  for (int i = 0; i < 5; i++)
  {
    // Read temperature registers
    uint8_t raw[2];
    if (!bus->read(TEMP_OUT_H, raw, 2))
      return false;
 
    // Convert raw to signed value
    int16_t temp = (int16_t)((raw[0] << 8) | raw[1]);
 
    // Convert to °C and accumulate
    temperature += temp / 333.87f + 21.0f;
  }
 
  // Compute average temperature
  temperature /= 5.0f;
 
  // Success
  return true;
}
 
 
bool DevLab_ICM20948::readMag(float &x, float &y, float &z) {
  if (!selectBank(0)) return false;
 
  uint8_t buf[9];
 
  if (!bus->read(EXT_SLV_SENS_DATA_00, buf, 9))
    return false;
 
 
  if (buf[8] & 0x08) return false;
 
  int16_t mx = (int16_t)(buf[1] | (buf[2] << 8));
  int16_t my = (int16_t)(buf[3] | (buf[4] << 8));
  int16_t mz = (int16_t)(buf[5] | (buf[6] << 8));
 
  x = mx * 0.15f;
  y = my * 0.15f;
  z = mz * 0.15f;
 
  return true;
}
 
bool DevLab_ICM20948::initMag()
{
  if (!bus)
    return false;
 
  softReset();
 
  sleep(false);
 
  if (!selectBank(0))
    return false;
  // Enable I2C master mode and disable I2C slave mode
  if (!bus->write(USER_CTRL, (uint8_t)USER_CTRL_I2C_MST_EN))
    return false;
 
  if (!selectBank(3))
    return false;
  if (!bus->write(I2C_MST_ODR_CONFIG,  (uint8_t)0x00))  
    return false;
 
  if (!bus->write(I2C_MST_CTRL, (uint8_t)0x07))
    return false;
  if(!bus->write(I2C_MST_DELAY_CTRL,  (uint8_t)0x01))  
    return false;
  delay(10);
 
  //Soft Reset
  writeSlave4(AK_CNTL3, 0x01);
 
  delay(100);
 
  uint8_t i, who;
  for (i = 0; i < 10; i++)
  {
    readSlave4(AK_WIA2, who);
    if (who == AK_WIA2_VAL)
    {
      //Mode 3 (continuous measurement 100Hz)
      writeSlave4(AK_CNTL2, 0x08);
 
      delay(10);
 
      // ---- Setup auto-read (SLV0) ----
      if (!selectBank(3))
        return false;
 
      if (!bus->write(I2C_SLV0_ADDR, (uint8_t)(AK09916_I2C_ADDR | 0x80)))
        return false;
 
      if (!bus->write(I2C_SLV0_REG, (uint8_t)AK_ST1))
        return false;
 
      if (!bus->write(I2C_SLV0_CTRL, (uint8_t)(I2C_SLVx_EN | 9)))
        return false;
 
      return true;
    }
 
     writeSlave4(AK_CNTL2, 0x08);
 
      delay(10);
 
      // ---- Setup auto-read (SLV0) ----
      if (!selectBank(3))
        return false;
 
      if (!bus->write(I2C_SLV0_ADDR, (uint8_t)(AK09916_I2C_ADDR | 0x80)))
        return false;
 
      if (!bus->write(I2C_SLV0_REG, (uint8_t)AK_ST1))
        return false;
 
      if (!bus->write(I2C_SLV0_CTRL, (uint8_t)(I2C_SLVx_EN | 9)))
        return false;
    
    return false;
  }
}
 
bool DevLab_ICM20948::setMagOpMode(ICM20948_Op_Mode opMode)
{
  // Write operation mode to magnetometer
  writeSlave4(AK_CNTL2, (uint8_t)opMode);
 
  return true;
}
 
bool DevLab_ICM20948::writeSlave4(uint8_t reg, uint8_t value) {
  if (!selectBank(3)) return false;
 
  bus->write(I2C_SLV4_ADDR, (uint8_t)(AK09916_I2C_ADDR));  // write mode
  bus->write(I2C_SLV4_REG,  (uint8_t)reg);
  bus->write(I2C_SLV4_DO,   (uint8_t)value);
  bus->write(I2C_SLV4_CTRL, (uint8_t)0x80);               // iniciar transacción
 
  // Cambiar a Bank 0 para verificar I2C_MST_STATUS
  if (!selectBank(0)) return false;
 
  uint32_t start = millis();
  uint8_t status;
  while (millis() - start < 20) {
    if (bus->read(I2C_MST_STATUS, status))
      if (status & 0x40)    // bit 6 = I2C_SLV4_DONE
        return true;
  }
  return false;  // timeout
}
 
bool DevLab_ICM20948::readSlave4(uint8_t reg, uint8_t &value) {
  if (!selectBank(3)) return false;
 
  bus->write(I2C_SLV4_ADDR, (uint8_t)(AK09916_I2C_ADDR | 0x80));  // read mode
  bus->write(I2C_SLV4_REG,  (uint8_t)reg);
  bus->write(I2C_SLV4_CTRL, (uint8_t)0x80);                       // iniciar transacción
 
  // Cambiar a Bank 0 para verificar I2C_MST_STATUS
  if (!selectBank(0)) return false;
 
  uint32_t start = millis();
  uint8_t status;
  while (millis() - start < 20) {
    if (bus->read(I2C_MST_STATUS, status))
      if (status & 0x40) {   // I2C_SLV4_DONE
        if (!selectBank(3)) return false;
        return bus->read(I2C_SLV4_DI, value);
      }
  }
  return false;  // timeout
}
 
bool DevLab_ICM20948::setLowPower(bool enable)
{
  // Select USER BANK 0
  if (!selectBank(0))
    return false;
 
  // Set or clear LP_EN bit (bit 5)
  if (!bus->writeBit(PWR_MGMT_1, 5, (uint8_t)enable))
    return false;
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::getLowPower(bool &enable)
{
  // Select USER BANK 0
  if (!selectBank(0))
    return false;
 
  // Read LP_EN bit (bit 5)
  uint8_t v = 0;
  if (!bus->readBit(PWR_MGMT_1, 5, v))
    return false;
 
  // Convert bit value to boolean
  enable = (v == 1);
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::setClock(ICM20948_Clock_Source clock)
{
  // Select USER BANK 0
  if (!selectBank(0))
    return false;
 
  // Set CLKSEL bits [2:0]
  if (!bus->write(PWR_MGMT_1, (uint8_t)clock))
    return false;
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::getClock(uint8_t &clock)
{
  // Select USER BANK 0
  if (!selectBank(0))
    return false;
 
  // Read CLKSEL bits [2:0]
  if (!bus->read(PWR_MGMT_1, clock))
    return false;
 
    clock &= 0x07;
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::setGyroSampleRate(float sampleRate)
{
  // Validate sample rate range (approx 4.3 Hz to 1100 Hz)
  if ((sampleRate < 4.3f) || (sampleRate > 1100.0f))
    return false;
 
  // Compute divider value
  uint8_t v = (uint8_t)((1100.0f / sampleRate) - 1.0f);
 
  // Select USER BANK 2
  if (!selectBank(2))
    return false;
 
  // Write sample rate divider
  if (!bus->write(GYRO_SMPLRT_DIV, v))
    return false;
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::getGyroSampleRate(float &sampleRate)
{
  // Validate bus pointer
  if (!bus)
    return false;
 
  // Select USER BANK 2
  if (!selectBank(2))
    return false;
 
  // Read sample rate divider
  uint8_t v = 0;
  if (!bus->read(GYRO_SMPLRT_DIV, v))
    return false;
 
  // Compute sample rate
  sampleRate = 1100.0f / (1.0f + v);
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::setDLPF(ICM20948_Gyro_DLPF dlpf, bool bypass)
{
  // Validate bus pointer
  if (!bus)
    return false;
 
  // Select USER BANK 2
  if (!selectBank(2))
    return false;
 
  // Enable or disable DLPF bypass (bit 0)
  if (!bus->writeBit(GYRO_CONFIG_1, 0, (uint8_t)bypass))
    return false;
 
  // If bypass enabled, skip DLPF configuration
  if (bypass)
    return true;
 
  // Set DLPF configuration bits [5:3]
  if (!bus->writeBits(GYRO_CONFIG_1, 3, 3, (uint8_t)dlpf))
    return false;
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::getDLPF(uint8_t &dlpf, bool &bypass)
{
  // Validate bus pointer
  if (!bus)
    return false;
 
  // Select USER BANK 2
  if (!selectBank(2))
    return false;
 
  // Read GYRO_CONFIG_1 register
  uint8_t v = 0;
  if (!bus->read(GYRO_CONFIG_1, v))
    return false;
 
  // Extract bypass bit (bit 0)
  bypass = (v & 0x01);
 
  // Extract DLPF bits [5:3]
  dlpf = (v >> 3) & 0x07;
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::setGyroScale(ICM20948_Gyro_FullScale fullScale)
{
  // Validate bus pointer
  if (!bus)
    return false;
 
  // Select USER BANK 2
  if (!selectBank(2))
    return false;
 
  // Set full-scale range bits [2:1]
  if (!bus->writeBits(GYRO_CONFIG_1, 1, 2, (uint8_t)fullScale))
    return false;
 
  // Update internal scale (LSB per g)
   degree_per_second = 32768.0f / (250.0f * (1 << ((uint8_t)fullScale)));
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::getGyroScale(uint8_t &fullScale)
{
  // Validate bus pointer
  if (!bus)
    return false;
 
  // Select USER BANK 2
  if (!selectBank(2))
    return false;
 
  // Read full-scale range bits [2:1]
  if (!bus->readBits(GYRO_CONFIG_1, 1, 2, fullScale))
    return false;
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::selfTestGyro(bool x, bool y, bool z)
{
  // Validate bus pointer
  if (!bus)
    return false;
 
  // Select USER BANK 2
  if (!selectBank(2))
    return false;
 
  // Set Z-axis self-test (bit 3)
  if (!bus->writeBit(GYRO_CONFIG_2, 3, (uint8_t)z))
    return false;
 
  // Set Y-axis self-test (bit 4)
  if (!bus->writeBit(GYRO_CONFIG_2, 4, (uint8_t)y))
    return false;
 
  // Set X-axis self-test (bit 5)
  if (!bus->writeBit(GYRO_CONFIG_2, 5, (uint8_t)x))
    return false;
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::setAccelSampleRate(uint16_t sampleRate)
{
  // Validate bus pointer
  if (!bus)
    return false;
 
  // Select USER BANK 2
  if (!selectBank(2))
    return false;
 
  // Validate input
  if (sampleRate == 0)
    return false;
 
  // Clamp maximum rate
  if (sampleRate >= 1125)
    return false;
 
  // Compute divider (rounded)
  uint16_t div = (1125.0f / sampleRate) - 1;
 
  if (div > 4095u)
    div = 4095u;
 
  // Split divider into high and low bytes
  uint8_t msb = (uint8_t)((div >> 8) & 0x0F);
  uint8_t lsb = (uint8_t)(div & 0xFF);
 
  // Write divider high byte
  if (!bus->write(ACCEL_SMPLRT_DIV_1, msb))
    return false;
 
  // Write divider low byte
  if (!bus->write(ACCEL_SMPLRT_DIV_2, lsb))
    return false;
 
  // Success
  return true;
}
bool DevLab_ICM20948::setAccelDivRate(uint16_t divisor)
{
  if (!bus)
    return false;
 
  // Select USER BANK 2
  if (!selectBank(2))
    return false;
 
  // Validate input
  if (divisor == 0)
    return false;
 
  if (divisor > 4095u)
    divisor = 4095u;
 
  // Split divider into high and low bytes
  uint8_t msb = (uint8_t)((divisor >> 8) & 0x0F);
  uint8_t lsb = (uint8_t)(divisor & 0xFF);
 
  // Write divider high byte
  if (!bus->write(ACCEL_SMPLRT_DIV_1, msb))
    return false;
 
  // Write divider low byte
  if (!bus->write(ACCEL_SMPLRT_DIV_2, lsb))
    return false;
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::setGyroDivRate(uint8_t divisor)
{
  if (!bus)
    return false;
  // Select USER BANK 2
  if (!selectBank(2))
    return false;
 
  // Write sample rate divider
  if (!bus->write(GYRO_SMPLRT_DIV, divisor))
    return false;
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::getAccelSampleRate(float &sampleRate)
{
  // Validate bus pointer
  if (!bus)
    return false;
 
  // Select USER BANK 2
  if (!selectBank(2))
    return false;
 
  // Read divider high byte
  uint8_t msb = 0;
  if (!bus->read(ACCEL_SMPLRT_DIV_1, msb))
    return false;
 
  // Read divider low byte
  uint8_t lsb = 0;
  if (!bus->read(ACCEL_SMPLRT_DIV_2, lsb))
    return false;
 
  // Combine 12-bit divider
  uint16_t div = ((msb & 0x0F) << 8) | lsb;
 
  // Compute sample rate
  sampleRate = 1125.0f / (1.0f + div);
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::selfTestAccel(bool x, bool y, bool z)
{
  // Validate bus pointer
  if (!bus)
    return false;
 
  // Select USER BANK 2
  if (!selectBank(2))
    return false;
 
  if (x)
  { // Set X-axis self-test (bit 7)
    if (!bus->writeBit(ACCEL_CONFIG_2, 7, (uint8_t)x))
      return false;
  }
 
  if (y)
  { // Set Y-axis self-test (bit 6)
    if (!bus->writeBit(ACCEL_CONFIG_2, 6, (uint8_t)y))
      return false;
  }
 
  if (z)
  { // Set Z-axis self-test (bit 5)
    if (!bus->writeBit(ACCEL_CONFIG_2, 5, (uint8_t)z))
      return false;
  }
  // Success
  return true;
}
 
bool DevLab_ICM20948::setAccelScale(ICM20948_Accel_FullScale fullScale)
{
  // Validate bus pointer
  if (!bus)
    return false;
 
  // Select USER BANK 2
  if (!selectBank(2))
    return false;
 
  // Set full-scale bits [2:1]
  if (!bus->writeBits(ACCEL_CONFIG, 1, 2, (uint8_t)fullScale))
    return false;
 
  // Update internal scale (LSB per g)
  mg_per_lsb = 16384.0f / (1 << (uint8_t)fullScale);
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::getAccelScale(uint8_t &fullScale)
{
  // Validate bus pointer
  if (!bus)
    return false;
 
  // Select USER BANK 2
  if (!selectBank(2))
    return false;
 
  // Read full-scale bits [2:1]
  if (!bus->readBits(ACCEL_CONFIG, 1, 2, fullScale))
    return false;
 
  // Success
  return true;
}
 
 
bool DevLab_ICM20948::setAccelDLPF(uint8_t dlpf, bool bypass)
{
  // Validate bus pointer
  if (!bus)
    return false;
 
  // Select USER BANK 2
  if (!selectBank(2))
    return false;
 
  // Set or clear DLPF bypass (bit 0)
  if (!bus->writeBit(ACCEL_CONFIG, 0, (uint8_t)bypass))
    return false;
 
  // If bypass enabled, skip DLPF configuration
  if (bypass)
    return true;
 
  // Limit DLPF value to valid range
  dlpf &= 0x07;
 
  // Set DLPF configuration bits [5:3]
  if (!bus->writeBits(ACCEL_CONFIG, 3, 3, dlpf))
    return false;
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::getAccelDLPF(uint8_t &dlpf, bool &bypass)
{
  // Validate bus pointer
  if (!bus)
    return false;
 
  // Select USER BANK 2
  if (!selectBank(2))
    return false;
 
  // Read ACCEL_CONFIG register
  uint8_t v = 0;
  if (!bus->read(ACCEL_CONFIG, v))
    return false;
 
  // Extract bypass bit (bit 0)
  bypass = (v & 0x01);
 
  // Extract DLPF bits [5:3]
  dlpf = (v >> 3) & 0x07;
 
  // Success
  return true;
}
 
 
bool DevLab_ICM20948::setAccelAveraging(ICM20948_Accel_Average avg)
{
  // Validate bus pointer
  if (!bus)
    return false;
 
  // Select USER BANK 2
  if (!selectBank(2))
    return false;
 
  // Set DEC3 averaging bits [1:0]
  if (!bus->writeBits(ACCEL_CONFIG_2, 0, 2, (uint8_t)avg))
    return false;
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::setGyroAveraging(ICM20948_Gyro_Average avg)
{
  // Validate bus pointer
  if (!bus)
    return false;
 
  // Select USER BANK 2
  if (!selectBank(2))
    return false;
 
  // Set DEC3 averaging bits [1:0]
  if (!bus->writeBits(GYRO_CONFIG_2, 0, 2, (uint8_t)avg))
    return false;
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::getAccelAveraging(uint8_t &avg)
{
  // Validate bus pointer
  if (!bus)
    return false;
 
  // Select USER BANK 2
  if (!selectBank(2))
    return false;
 
  // Read DEC3 averaging bits [1:0]
  if (!bus->readBits(ACCEL_CONFIG_2, 0, 2, avg))
    return false;
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::setSensors(bool accel_on, bool gyro_on, bool temp_on)
{
  // Validate bus pointer
  if (!bus)
    return false;
 
  // Select USER BANK 0
  if (!selectBank(0))
    return false;
 
  // Build PWR_MGMT_2 mask
  uint8_t v = 0;
 
  // Disable accel axes if not enabled
  if (!accel_on)
    v |= 0x38; // bits [5:3]
 
  // Disable gyro axes if not enabled
  if (!gyro_on)
    v |= 0x07; // bits [2:0]
 
  // Write sensor enable/disable mask
  if (!bus->write(PWR_MGMT_2, v))
    return false;
 
  // Set or clear TEMP_DIS bit (bit 3)
  if (!bus->writeBit(PWR_MGMT_1, 3, (uint8_t)!temp_on))
    return false;
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::getSensors(bool &accel_on, bool &gyro_on, bool &temp_on)
{
  // Validate bus pointer
  if (!bus)
    return false;
 
  // Select USER BANK 0
  if (!selectBank(0))
    return false;
 
  // Read PWR_MGMT_2 register
  uint8_t v = 0;
  if (!bus->read(PWR_MGMT_2, v))
    return false;
 
  // Decode gyro state (bits [2:0])
  gyro_on = ((v & 0x07) == 0);
 
  // Decode accel state (bits [5:3])
  accel_on = ((v & 0x38) == 0);
 
  // Read TEMP_DIS bit (bit 3)
  uint8_t t = 0;
  if (!bus->readBit(PWR_MGMT_1, 3, t))
    return false;
 
  // Decode temperature state
  temp_on = (t == 0);
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::setGyroOffset(uint16_t offsetX, uint16_t offsetY, uint16_t offsetZ)
{
  // Validate bus pointer
  if (!bus)
    return false;
 
  // Select USER BANK 2
  if (!selectBank(2))
    return false;
 
  // Pack offset values into byte array
  uint8_t data[6] = {
      (uint8_t)(offsetX >> 8),
      (uint8_t)(offsetX & 0xFF),
      (uint8_t)(offsetY >> 8),
      (uint8_t)(offsetY & 0xFF),
      (uint8_t)(offsetZ >> 8),
      (uint8_t)(offsetZ & 0xFF)};
 
  // Write offset registers
  if (!bus->write(XG_OFFS_USRH, data, 6))
    return false;
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::getGyroOffset(int16_t &offsetX, int16_t &offsetY, int16_t &offsetZ)
{
  // Validate bus pointer
  if (!bus)
    return false;
 
  // Select USER BANK 2
  if (!selectBank(2))
    return false;
 
  // Read offset registers
  uint8_t data[6];
  if (!bus->read(XG_OFFS_USRH, data, 6))
    return false;
 
  // Convert to signed values
  offsetX = (int16_t)((data[0] << 8) | data[1]);
  offsetY = (int16_t)((data[2] << 8) | data[3]);
  offsetZ = (int16_t)((data[4] << 8) | data[5]);
 
  // Success
  return true;
}
 
 
bool DevLab_ICM20948::setAccelOffset(int16_t offsetX, int16_t offsetY, int16_t offsetZ)
{
  // Validate bus pointer
  if (!bus)
    return false;
 
  // Select USER BANK 1 (accel offsets are here)
  if (!selectBank(1))
    return false;
 
  // Pack offset values into byte array
  uint8_t data[6] = {
      (uint8_t)(offsetX >> 8),
      (uint8_t)(offsetX & 0xFF),
      (uint8_t)(offsetY >> 8),
      (uint8_t)(offsetY & 0xFF),
      (uint8_t)(offsetZ >> 8),
      (uint8_t)(offsetZ & 0xFF)};
 
  // Write offset registers
  if (!bus->write(XA_OFFS_H, data, 6))
    return false;
 
  // Success
  return true;
}
 
bool DevLab_ICM20948::getAccelOffset(int16_t &offsetX, int16_t &offsetY, int16_t &offsetZ)
{
  // Validate bus pointer
  if (!bus)
    return false;
 
  // Select USER BANK 1
  if (!selectBank(1))
    return false;
 
  // Read offset registers
  uint8_t data[6];
  if (!bus->read(XA_OFFS_H, data, 6))
    return false;
 
  // Convert to signed values
  offsetX = (int16_t)((data[0] << 8) | data[1]);
  offsetY = (int16_t)((data[2] << 8) | data[3]);
  offsetZ = (int16_t)((data[4] << 8) | data[5]);
 
  // Success
  return true;
}
 
 
bool DevLab_ICM20948::intInit(const ICM20948_IntPinConfig &cfg){
  // Validate bus pointer
  if (!bus)
    return false;
 
  if(!selectBank(0))
    return false;
 
  uint8_t reg = (cfg.activeLevel   << 7) |
                (cfg.driveMode     << 6) |
                (cfg.latchMode     << 5) |
                (cfg.clearMode     << 4) |
                (cfg.fsyncActLevel << 3) |
                (cfg.fsyncIntEn    << 2) |
                (cfg.bypassEn      << 1);
  // Initialize INT1 
  // Configure interrupt pin (open-drain, active-low, latch)
  if (!bus->write(INT_PIN_CFG, reg))
    return false;
 
  // Configuration successful
  return true;
}
 
bool DevLab_ICM20948::intEnableConfig(const ICM20948_IntEnableConfig &cfg)
{
  if (!bus)           return false;
  if (!selectBank(0)) return false;
 
  // INT_ENABLE
  uint8_t reg0 = (cfg.wofEn       << 7) |
                 (cfg.womIntEn    << 3) |
                 (cfg.pllRdyEn    << 2) |
                 (cfg.dmpInt1En   << 1) |
                 (cfg.i2cMstIntEn << 0);
  if (!bus->write(INT_ENABLE, reg0)) return false;
 
  // INT_ENABLE_1
  if (!bus->write(INT_ENABLE_1, (uint8_t)(cfg.rawDataRdyEn & 0x01))) return false;
 
  // INT_ENABLE_2 — construye máscara desde el array
  uint8_t ovfMask = 0;
  for (uint8_t i = 0; i < 5; i++)
    ovfMask |= (cfg.fifoOvfEn[i] ? BIT(i) : 0);
  if (!bus->write(INT_ENABLE_2, ovfMask)) return false;
 
  // INT_ENABLE_3 — igual
  uint8_t wmMask = 0;
  for (uint8_t i = 0; i < 5; i++)
    wmMask |= (cfg.fifoWmEn[i] ? BIT(i) : 0);
  if (!bus->write(INT_ENABLE_3, wmMask)) return false;
 
  return true;
}
 
bool DevLab_ICM20948::checkIntStatus(ICM20948_IntStatus &status)
{
  if (!bus)           return false;
  if (!selectBank(0)) return false;
 
  // Leer los 4 registros de status en una sola operación de burst
  uint8_t raw[4];
  if (!bus->read(INT_STATUS, raw, 4)) return false;
 
  // INT_STATUS (0x19)
  status.womInt    = (raw[0] & STS_WOM_INT)     ? 1 : 0;
  status.pllRdyInt = (raw[0] & STS_PLL_RDY_INT) ? 1 : 0;
  status.dmpInt1   = (raw[0] & STS_DMP_INT1)    ? 1 : 0;
  status.i2cMstInt = (raw[0] & STS_I2C_MST_INT) ? 1 : 0;
 
  // INT_STATUS_1 (0x1A)
  status.rawDataRdy = (raw[1] & STS_RAW_DATA_0_RDY_INT) ? 1 : 0;
 
  // INT_STATUS_2 (0x1B) — FIFO overflow canal por canal
  for (uint8_t i = 0; i < 5; i++)
    status.fifoOvf[i] = (raw[2] & BIT(i)) ? 1 : 0;
 
  // INT_STATUS_3 (0x1C) — FIFO watermark canal por canal
  for (uint8_t i = 0; i < 5; i++)
    status.fifoWm[i] = (raw[3] & BIT(i)) ? 1 : 0;
 
  return true;
}
 
bool DevLab_ICM20948::auxMasterEnable(uint8_t clkFreq)
{
    // BANK 0: asegurarse que BYPASS_EN=0 e I2C_MST_EN=1
    if (!selectBank(0)) return false;
 
    // Limpiar BYPASS_EN (bit 1 de INT_PIN_CFG)
    if (!bus->writeBit(INT_PIN_CFG, 1, (uint8_t)0)) return false;
 
    // Activar I2C_MST_EN (bit 5 de USER_CTRL)
    if (!bus->writeBit(USER_CTRL, 5, (uint8_t)1)) return false;
 
    // BANK 3: configurar clock del master auxiliar
    if (!selectBank(3)) return false;
 
    // clkFreq típico: 0x07 = ~345.6 kHz  |  0x0D = ~400 kHz
    if (!bus->writeBits(I2C_MST_CTRL, 0, 4, clkFreq)) return false;
 
    // Volver a BANK 0
    return selectBank(0);
}
 
bool DevLab_ICM20948::auxWriteByte(uint8_t slaveAddr, uint8_t reg, uint8_t data)
{
    if (!selectBank(3)) return false;
 
    // Dirección del slave, bit 7=0 para escritura
    if (!bus->write(I2C_SLV4_ADDR, (uint8_t)(slaveAddr & 0x7F))) return false;
 
    // Registro destino que queremos escribir en el slave
    if (!bus->write(I2C_SLV4_REG, reg)) return false;
 
    // Dato a escribir
    if (!bus->write(I2C_SLV4_DO, data)) return false;
 
    // Disparar transacción (I2C_SLV4_EN, se auto-limpia al terminar)
    if (!bus->write(I2C_SLV4_CTRL, (uint8_t)I2C_SLVx_EN)) return false;
 
    // Esperar a que complete — verificar SLV4_DONE en BANK 0
    if (!selectBank(0)) return false;
 
    uint8_t status = 0;
    uint8_t timeout = 50;
    do {
        delay(1);
        if (!bus->read(I2C_MST_STATUS, status)) return false;
        if (--timeout == 0) return false;  // timeout
    } while (!(status & MST_SLV4_DONE));
 
    // Verificar que no hubo NACK
    return !(status & MST_SLV4_NACK);
}
 
bool DevLab_ICM20948::auxReadByte(uint8_t slaveAddr, uint8_t reg, uint8_t &data)
{
    if (!selectBank(3)) return false;
 
    // Dirección del slave, bit 7=1 para lectura
    if (!bus->write(I2C_SLV4_ADDR, (uint8_t)((slaveAddr & 0x7F) | I2C_SLVx_RNW))) return false;
 
    // Registro origen que queremos leer del slave
    if (!bus->write(I2C_SLV4_REG, reg)) return false;
 
    // Disparar transacción (I2C_SLV4_EN, se auto-limpia al terminar)
    if (!bus->write(I2C_SLV4_CTRL, (uint8_t)I2C_SLVx_EN)) return false;
 
    // Esperar a que complete — verificar SLV4_DONE en BANK 0
    if (!selectBank(0)) return false;
 
    uint8_t status = 0;
    uint8_t timeout = 50;
    do {
        delay(1);
        if (!bus->read(I2C_MST_STATUS, status)) return false;
        if (--timeout == 0) return false;  // timeout
    } while (!(status & MST_SLV4_DONE));
 
    // Verificar que no hubo NACK
    if (status & MST_SLV4_NACK) return false;
 
    // Leer el dato recibido del slave (BANK 3)
    if (!selectBank(3)) return false;
    if (!bus->read(I2C_SLV4_DI, data)) return false;
 
    return selectBank(0);
}
 
bool DevLab_ICM20948::auxWriteCommand(uint8_t slaveAddr, uint8_t cmd)
{
    if (!selectBank(3)) return false;
 
    // Dirección del slave, bit 7=0 para escritura
    if (!bus->write(I2C_SLV4_ADDR, (uint8_t)(slaveAddr & 0x7F))) return false;
 
    // Byte de comando a enviar (único byte de la transacción)
    if (!bus->write(I2C_SLV4_DO, cmd)) return false;
 
    // EN + REG_DIS: el SLV4 envía solo I2C_SLV4_DO, sin byte de registro
    if (!bus->write(I2C_SLV4_CTRL, (uint8_t)(I2C_SLVx_EN | I2C_SLVx_REG_DIS))) return false;
 
    // Esperar a que complete — verificar SLV4_DONE en BANK 0
    if (!selectBank(0)) return false;
 
    uint8_t status = 0;
    uint8_t timeout = 50;
    do {
        delay(1);
        if (!bus->read(I2C_MST_STATUS, status)) return false;
        if (--timeout == 0) return false;  // timeout
    } while (!(status & MST_SLV4_DONE));
 
    // Verificar que no hubo NACK
    return !(status & MST_SLV4_NACK);
}
 
  bool DevLab_ICM20948::auxConfigSlave(uint8_t slaveAddr, uint8_t reg, uint8_t numBytes)
{
    if (!selectBank(3)) return false;
 
    // Slave 0: dirección + bit READ
    if (!bus->write(I2C_SLV0_ADDR, (uint8_t)(slaveAddr | I2C_SLVx_RNW))) return false;
 
    // Registro de inicio
    if (!bus->write(I2C_SLV0_REG, reg)) return false;
 
    // Habilitar + número de bytes
    if (!bus->write(I2C_SLV0_CTRL, (uint8_t)(I2C_SLVx_EN | (numBytes & 0x0F)))) return false;
 
    return selectBank(0);
}
 
// Para leer los datos que el ICM leyó automáticamente:
bool DevLab_ICM20948::auxReadSensorData(uint8_t *buf, uint8_t len)
{
    if (!selectBank(0)) return false;
    return bus->read(EXT_SLV_SENS_DATA_00, buf, len);
}
 
bool DevLab_ICM20948::auxReadResponse(uint8_t slaveAddr, uint8_t &data)
{
    if (!selectBank(3)) return false;
 
    // Slave address con bit READ, sin byte de registro (REG_DIS)
    // Genera: [START, addr+R, lee 1 byte, STOP]
    if (!bus->write(I2C_SLV4_ADDR, (uint8_t)((slaveAddr & 0x7F) | I2C_SLVx_RNW))) return false;
    if (!bus->write(I2C_SLV4_CTRL, (uint8_t)(I2C_SLVx_EN | I2C_SLVx_REG_DIS))) return false;
 
    if (!selectBank(0)) return false;
 
    uint8_t status = 0;
    uint8_t timeout = 50;
    do {
        delay(1);
        if (!bus->read(I2C_MST_STATUS, status)) return false;
        if (--timeout == 0) return false;
    } while (!(status & MST_SLV4_DONE));
 
    if (status & MST_SLV4_NACK) return false;
 
    if (!selectBank(3)) return false;
    if (!bus->read(I2C_SLV4_DI, data)) return false;
 
    return selectBank(0);
}
 
bool DevLab_ICM20948::auxRead12bit(uint16_t &raw)
{
    uint8_t buf[2];
    if (!auxReadSensorData(buf, 2)) return false;
 
    // LSB primero (little-endian): buf[0] = byte bajo, buf[1] = byte alto
    raw = (uint16_t)(buf[0] | (buf[1] << 8)) & 0x0FFF;
 
    return true;
}