Method command

SPIFlash.cpp:173–191

Send a command to the flash chip, pass TRUE for isWrite when its a write command

/// Send a command to the flash chip, pass TRUE for isWrite when its a write command
void SPIFlash::command(uint8_t cmd, boolean isWrite){
#if defined(__AVR_ATmega32U4__) // Arduino Leonardo, MoteinoLeo
  DDRB |= B00000001;            // Make sure the SS pin (PB0 - used by RFM12B on MoteinoLeo R1) is set as output HIGH!
  PORTB |= B00000001;
#endif
  if (isWrite)
  {
    command(SPIFLASH_WRITEENABLE); // Write Enable
    unselect();
  }
  //wait for any write/erase to complete
  //  a time limit cannot really be added here without it being a very large safe limit
  //  that is because some chips can take several seconds to carry out a chip erase or other similar multi block or entire-chip operations
  //  a recommended alternative to such situations where chip can be or not be present is to add a 10k or similar weak pulldown on the
  //  open drain MISO input which can read noise/static and hence return a non 0 status byte, causing the while() to hang when a flash chip is not present
  if (cmd != SPIFLASH_WAKE) while(busy());
  select();
  SPI.transfer(cmd);
}

/// check if the chip is busy erasing/writing
boolean SPIFlash::busy()