/* Function for sending acknowledgement to SPI Master. 
This function will send an acknowledgement byte 's' to the master to indicate the master that it has received and programmed the data.  */
static void send_ack(void)
/* Function for sending acknowledgement to SPI Master. 
This function will send an acknowledgement byte 's' to the master to indicate the master that it has received and programmed the data.  */
static void send_ack(void)
{
	uint8_t ack = 's';
	spi_write_buffer_wait(&slave, &ack, 1);
}