| /************************************************************************************************** | |
| * File: MP3_driver.c | |
| * File Type: C - Source Code File | |
| * (C) mikroElektronika, 2010-2012 | |
| * Revision History: | |
| * - Initial version | |
| * Description: | |
| * This project demonstrates communication with VS1053B mp3 codec. | |
| * Program reads one mp3 file from MMC and sends it to VS1053B for decoding | |
| * and playing. | |
| * MMC and MP3_SCI share Hardware SPI module. | |
| * Test configuration: | |
| * MCU: STM32F107VC | |
| http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/CD00220364.pdf | |
| Dev.Board: EasyMx v7 for STM32 ® ARM ® | |
| http://www.mikroe.com/easymx-pro/stm32/ | |
| ac:EasyMx7 | |
| * Modules: MP3 VS1053B on-board module | |
| * ac:MP3_Codec | |
| * EasyTFT | |
| ac:easyTFT | |
| * Oscillator: Internal Clock, 72.0000 MHz | |
| * SW: mikroC PRO for ARM | |
| * http://www.mikroe.com/mikroc/arm/ | |
| * NOTES: | |
| * - Make sure that MMC card is properly formatted (to FAT16 or just FAT) | |
| * before testing it on this example. | |
| * - Make sure that MMC card contains appropriate mp3 file ( sound.mp3 ). | |
| **************************************************************************************************/ | |
| /************************************************************************************************** | |
| * CODEC V1053E connections | |
| **************************************************************************************************/ | |
| extern sfr sbit MP3_CS; | |
| extern sfr sbit MP3_RST; | |
| extern sfr sbit BSYNC; | |
| extern sfr sbit DREQ; | |
| /************************************************************************************************** | |
| * Function MP3_SCI_Write() | |
| * ------------------------------------------------------------------------------------------------- | |
| * Overview: Function writes one byte to MP3 SCI | |
| * Input: register address in codec, data | |
| * Output: Nothing | |
| **************************************************************************************************/ | |
| void MP3_SCI_Write(char address, unsigned int data_in) { | |
| BSYNC = 1; | |
| MP3_CS = 0; // select MP3 SCI | |
| SPI3_Write(WRITE_CODE); | |
| SPI3_Write(address); | |
| SPI3_Write(Hi(data_in)); // high byte | |
| SPI3_Write(Lo(data_in)); // low byte | |
| MP3_CS = 1; // deselect MP3 SCI | |
| while (DREQ == 0); // wait until DREQ becomes 1, see MP3 codec datasheet, Serial Protocol for SCI | |
| } | |
| /************************************************************************************************** | |
| * Function MP3_SCI_Read() | |
| * ------------------------------------------------------------------------------------------------- | |
| * Overview: Function reads words_count words from MP3 SCI | |
| * Input: start address, word count to be read | |
| * Output: words are stored to data_buffer | |
| **************************************************************************************************/ | |
| void MP3_SCI_Read(char start_address, char words_count, unsigned int *data_buffer) { | |
| unsigned int temp; | |
| MP3_CS = 0; // select MP3 SCI | |
| SPI3_Write(READ_CODE); | |
| SPI3_Write(start_address); | |
| while (words_count--) { // read words_count words byte per byte | |
| temp = SPI3_Read(0); | |
| temp <<= 8; | |
| temp += SPI3_Read(0); | |
| *(data_buffer++) = temp; | |
| } | |
| MP3_CS = 1; // deselect MP3 SCI | |
| while (DREQ == 0); // wait until DREQ becomes 1, see MP3 codec datasheet, Serial Protocol for SCI | |
| } | |
| /************************************************************************************************** | |
| * Function MP3_SDI_Write() | |
| * ------------------------------------------------------------------------------------------------- | |
| * Overview: Function write one byte to MP3 SDI | |
| * Input: data to be writed | |
| * Output: Nothing | |
| **************************************************************************************************/ | |
| void MP3_SDI_Write(char data_) { | |
| MP3_CS = 1; | |
| BSYNC = 0; | |
| while (DREQ == 0); // wait until DREQ becomes 1, see MP3 codec datasheet, Serial Protocol for SCI | |
| SPI3_Write(data_); | |
| BSYNC = 1; | |
| } | |
| /************************************************************************************************** | |
| * Function MP3_SDI_Write_32 | |
| * ------------------------------------------------------------------------------------------------- | |
| * Overview: Function Write 32 bytes to MP3 SDI | |
| * Input: data buffer | |
| * Output: Nothing | |
| **************************************************************************************************/ | |
| void MP3_SDI_Write_32(char *data_) { | |
| char i; | |
| MP3_CS = 1; | |
| BSYNC = 0; | |
| while (DREQ == 0); // wait until DREQ becomes 1, see MP3 codec datasheet, Serial Protocol for SCI | |
| for (i=0; i<32; i++) | |
| SPI3_Write(data_[i]); | |
| BSYNC = 1; | |
| } | |
| /************************************************************************************************** | |
| * Function MP3_Set_Volume() | |
| * ------------------------------------------------------------------------------------------------- | |
| * Overview: Function set volume on the left and right channel | |
| * Input: left channel volume, right channel volume | |
| * Output: Nothing | |
| **************************************************************************************************/ | |
| void MP3_Set_Volume(char left, char right) { | |
| unsigned int volume; | |
| volume = (left<<8) + right; // calculate value | |
| MP3_SCI_Write(SCI_VOL_ADDR, volume); // Write value to VOL register | |
| } | |
| /************************************************************************************************** | |
| * End of File | |
| **************************************************************************************************/ |