void TIM7_IRQHandler()
{
	//	Clear the interrupt flag
	TIM7->SR &= ~(TIM_SR_UIF);
	//	Get the new sample

	memcpy(&left, &sd_data_buffer[index % sizeof(sd_data_buffer)], sizeof(uint16_t));
	memcpy(&right, &sd_data_buffer[(index % sizeof(sd_data_buffer)) + 2], sizeof(uint16_t));

	left += 32768;
	right += 32768;
	//	Scale the sample values
	diff = left - 32768;
	diff = diff *0.25;
	left = 32768+diff;
	diff = right - 32768;
	diff = diff *0.25;
	right = 32768+diff;


	samples = ((uint32_t)(left)<<16) + (uint32_t)right;

	DAC_Put_Data_Dual_12bit_L(samples);

	index += 4;
	//	If next sample will wrap the sample array then change the buffer with samples
	if(index % sizeof(sd_data_buffer) == 0)
	{
		static buffer_index = 0;
		if(buffer_index % 2 == 0)
		{
			data_ptr = sd_data_buffer;
			empty_data_buf_ptr = sd_data_buffer_additional;
		}
		else
		{
			data_ptr = sd_data_buffer_additional;
			empty_data_buf_ptr = sd_data_buffer;
		}
		index = 0;
		if(wav_eof)
		{
			//	Stop the DAC triggering timer
			TIM_Stop(TIM7);
			//	Close the file
			ret_val = f_close(&sd_current_file);
			//	Clear the flags
			wav_file_playing = false;
			wav_file_chosen = false;
			//	Clear the green led
			GPIOD->ODR &= ~GPIO_ODR_ODR_12;
			//	Set the next state
			state = STATE_EXECUTE_USER_REQUESTS;
			// clear the sample index
			buffer_index = 0;
		}
		else
		{
			//	Change the state of device
			state = STATE_READ_SAMPLES;
		}
		// Increment the buffer index which indicates which sample array is currently used and which is to be filled with samples
		buffer_index++;
	}
}