DRV8462: DRV8462

Hey Phillip, give us another day to look into this, apologies.

Make sure you're following the SPI format requirements.  This typically corresponds to the standard of "SPI Mode 1", where CPOL=0 and CPHA=1, output edge rising and data capture falling. 

Best,

Jacob

Perhaps this example code from our EVM will also help:

// Direct writing of a register
void DRV8462::writeRegister(uint8_t reg, uint8_t value)
{
  write8(reg, value);
}

// These defines are in the .h file
// SPI Protocol
#define SPI_ADDRESS_MASK   0x3F00        // Mask for SPI register address bits
#define SPI_ADDRESS_POS    8             // Position for SPI register address bits
#define SPI_DATA_MASK      0x00FF        // Mask for SPI register data bits
#define SPI_DATA_POS       0             // Position for SPI register data bits
#define SPI_RW_BIT_MASK    0x4000        // Mask for SPI register read write indication bit

void DRV8462::write8(uint8_t reg, uint8_t value) {

  // This SPI function is used to write the set device configurations and operating
  // parameters of the device.
  // Register format |R/W|A5|A4|A3|A2|A1|A0|*|D7|D6|D5|D4|D3|D2|D1|D0|
  // Ax is address bit, Dx is data bits and R/W is read write bit.
  // For write R/W bit should 0.

  volatile uint16_t reg_value = 0; // Variable for the combined register and data info
  reg_value |= ((reg << SPI_ADDRESS_POS) & SPI_ADDRESS_MASK);         // Adding register address value
  reg_value |= ((value << SPI_DATA_POS) & SPI_DATA_MASK);             // Adding data value

  digitalWrite(_cs, LOW);

  SPIxfer((uint8_t)((reg_value>>8) & 0xFF));
  SPIxfer((uint8_t)(reg_value & 0xFF));

  digitalWrite(_cs, HIGH);
}

uint8_t DRV8462::SPIxfer(uint8_t x) {
  if (_clk == -1) {
    return _spi->transfer(x);
  } else {
    // Serial.println("Software SPI");
    uint8_t reply = 0;
    for (int i = 7; i >= 0; i--) {
      reply <<= 1;
      digitalWrite(_clk, HIGH);
      digitalWrite(_mosi, x & (1 << i));
      digitalWrite(_clk, LOW);
      if (digitalRead(_miso))
        reply |= 1;
    }
    return reply;
  }
}

Thanks for the help Jacob. Realised it was not SPI mode 1 so has been changed since then.