VS1053-STM32

VS1053, VS1063 MP3 decoder STM32 Example code with 7 line interface (SCK, MOSI, MISO, RESET, DREQ, CS, DSC)

VS1053 Pins	Description
SCK	SPI Clock
SI	Slave in (MOSI)
SO	Slave out (MISO)
RESET	VS1053 Reset pin. Active Low
DREQ	If DREQ is high, VS1053b can take at least 32 bytes of SDI data or one SCI command. DREQ is turned low when the stream buffer is too full and for the duration of a SCI command.
CS	SPI CS. Active low
DCS	MP3 Data CS. Active low (only used while transferring MP3 Data)

Driver APIs

//For writing data to VS10xx registers at addr
void vs1053_write_sci(uint8_t addr, uint16_t data) {

	uint8_t d = 2;

	while(!HAL_GPIO_ReadPin(VS1053_DREQ_GPIO_Port, VS1053_DREQ_Pin)); //Wait until DREQ is high

	HAL_GPIO_WritePin(VS1053_CS_GPIO_Port, VS1053_CS_Pin, 0); //Activate CS (Chip select, Active Low)
	HAL_SPI_Transmit(&hspi2, &d, 1, 50); //Write command code
	HAL_SPI_Transmit(&hspi2, &addr, 1, 50); //SCI Register number
	d = ((uint8_t)(data >> 8) & 0xFF);
	HAL_SPI_Transmit(&hspi2, &d, 1, 50); //LSB
	d = ((uint8_t)(data & 0xFF));
	HAL_SPI_Transmit(&hspi2, &d, 1, 50); //LSB
	HAL_GPIO_WritePin(VS1053_CS_GPIO_Port, VS1053_CS_Pin, 1); //De-Activate CS (Chip select, Active Low)
}

//For reading VS10xx register at addr
uint16_t vs1053_read_sci(uint8_t addr) {

	uint16_t res;

	uint8_t r;

	uint8_t d = 3;

	while(!HAL_GPIO_ReadPin(VS1053_DREQ_GPIO_Port, VS1053_DREQ_Pin)); //Wait until DREQ is high


	HAL_GPIO_WritePin(VS1053_CS_GPIO_Port, VS1053_CS_Pin, 0); //Activate CS (Chip select, Active Low)
	HAL_SPI_Transmit(&hspi2, &d, 1, 50); //Read command code
	HAL_SPI_Transmit(&hspi2, &addr, 1, 50); //SCI Register number
	HAL_SPI_Receive(&hspi2, &r, 1, 50);
	res = ((uint16_t)(r << 8)) & 0xFF00;
	HAL_SPI_Receive(&hspi2, &r, 1, 50);
	res |= ((uint16_t)r & 0x00FF);
	HAL_GPIO_WritePin(VS1053_CS_GPIO_Port, VS1053_CS_Pin, 1); //De-Activate CS (Chip select, Active Low)

	return res;
}


//Sending MP3 raw bytes. Max 32 bytes at time without checking DREQ each time
int vs1053_write_sdi(uint8_t *data, uint8_t bytes){


	if(bytes > 32) {
		return -1;//Error - too many bytes to transfer
	}

	while(!HAL_GPIO_ReadPin(VS1053_DREQ_GPIO_Port, VS1053_DREQ_Pin));


	HAL_GPIO_WritePin(VS1053_DCS_GPIO_Port, VS1053_DCS_Pin, 0); //De-Activate DCS (Active Low)


	HAL_SPI_Transmit(&hspi2, data, bytes, 50);
	data++;

	HAL_GPIO_WritePin(VS1053_DCS_GPIO_Port, VS1053_DCS_Pin, 1);
	return 0;
}