Masahiko Hasebe / microbit_ymf825

This program generates sound by using FM tone generator YMF825 via SPI.

Dependencies:   microbit

fmsd1_micro.cpp@0:c54d59d6fb78, 2018-01-05 (annotated)

Committer:
hasebems
Date:
Fri Jan 05 22:58:49 2018 +0000
Revision:
0:c54d59d6fb78
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Who changed what in which revision?

UserRevisionLine numberNew contents of line
hasebems 0:c54d59d6fb78 1 #include "MicroBit.h"
hasebems 0:c54d59d6fb78 2
hasebems 0:c54d59d6fb78 3 SPI ymf825(MOSI, MISO, SCK);
hasebems 0:c54d59d6fb78 4 MicroBitPin ss(MICROBIT_ID_IO_P16,MICROBIT_PIN_P16,PIN_CAPABILITY_DIGITAL);
hasebems 0:c54d59d6fb78 5 MicroBitPin rst(MICROBIT_ID_IO_P8,MICROBIT_PIN_P8,PIN_CAPABILITY_DIGITAL);
hasebems 0:c54d59d6fb78 6
hasebems 0:c54d59d6fb78 7 //extern MicroBit uBit;
hasebems 0:c54d59d6fb78 8 //#define ss uBit.io.P16
hasebems 0:c54d59d6fb78 9 //#define rst uBit.io.P8
hasebems 0:c54d59d6fb78 10
hasebems 0:c54d59d6fb78 11 void writeSingleCPP( unsigned char adrs, unsigned char data )
hasebems 0:c54d59d6fb78 12 {
hasebems 0:c54d59d6fb78 13 ss.setDigitalValue(0); // select slave
hasebems 0:c54d59d6fb78 14 ymf825.write(adrs);
hasebems 0:c54d59d6fb78 15 ymf825.write(data);
hasebems 0:c54d59d6fb78 16 ss.setDigitalValue(1);
hasebems 0:c54d59d6fb78 17 wait_ms(1);
hasebems 0:c54d59d6fb78 18 }
hasebems 0:c54d59d6fb78 19 extern "C" void writeSingle( unsigned char adrs, unsigned char data ){ writeSingleCPP(adrs,data);}
hasebems 0:c54d59d6fb78 20 extern "C" void writeBurst( unsigned char adrs, unsigned char* data, int count )
hasebems 0:c54d59d6fb78 21 {
hasebems 0:c54d59d6fb78 22 ss.setDigitalValue(0);
hasebems 0:c54d59d6fb78 23 ymf825.write(adrs);
hasebems 0:c54d59d6fb78 24 for (int i = 0; i<count; i++) {
hasebems 0:c54d59d6fb78 25 ymf825.write(*(data + i));
hasebems 0:c54d59d6fb78 26 }
hasebems 0:c54d59d6fb78 27 ss.setDigitalValue(1);
hasebems 0:c54d59d6fb78 28 wait_ms(1);
hasebems 0:c54d59d6fb78 29 }
hasebems 0:c54d59d6fb78 30 extern "C" void delayMs( int ms ){ wait_ms(ms);}
hasebems 0:c54d59d6fb78 31
hasebems 0:c54d59d6fb78 32 void initSPI(void)
hasebems 0:c54d59d6fb78 33 {
hasebems 0:c54d59d6fb78 34 // init SPI
hasebems 0:c54d59d6fb78 35 ymf825.format(8); // mode=0
hasebems 0:c54d59d6fb78 36 ymf825.frequency(4000000);
hasebems 0:c54d59d6fb78 37
hasebems 0:c54d59d6fb78 38 }
hasebems 0:c54d59d6fb78 39 void initSD1( void )
hasebems 0:c54d59d6fb78 40 {
hasebems 0:c54d59d6fb78 41 // 1. powerOnReset( void );
hasebems 0:c54d59d6fb78 42 rst.setDigitalValue(0);
hasebems 0:c54d59d6fb78 43
hasebems 0:c54d59d6fb78 44 // 2. wait 100usec
hasebems 0:c54d59d6fb78 45 wait_us(100);
hasebems 0:c54d59d6fb78 46
hasebems 0:c54d59d6fb78 47 // 3. RST_N : high
hasebems 0:c54d59d6fb78 48 rst.setDigitalValue(1);
hasebems 0:c54d59d6fb78 49
hasebems 0:c54d59d6fb78 50 // 4. DRV_SEL : low
hasebems 0:c54d59d6fb78 51 writeSingleCPP(29, 1); // 3.3v
hasebems 0:c54d59d6fb78 52
hasebems 0:c54d59d6fb78 53 // 5. AP0 : 0
hasebems 0:c54d59d6fb78 54 writeSingleCPP(2, 0x0e);
hasebems 0:c54d59d6fb78 55
hasebems 0:c54d59d6fb78 56 // 6. wait for Quarz stability
hasebems 0:c54d59d6fb78 57 wait_ms(1);
hasebems 0:c54d59d6fb78 58
hasebems 0:c54d59d6fb78 59 // 7. CLKE : "1"
hasebems 0:c54d59d6fb78 60 writeSingleCPP(0, 0x01);
hasebems 0:c54d59d6fb78 61
hasebems 0:c54d59d6fb78 62 // 8. ALRST : low
hasebems 0:c54d59d6fb78 63 writeSingleCPP(1, 0x00);
hasebems 0:c54d59d6fb78 64
hasebems 0:c54d59d6fb78 65 // 9. SFTRST : 0xa3
hasebems 0:c54d59d6fb78 66 writeSingleCPP(26, 0xa3);
hasebems 0:c54d59d6fb78 67 wait_ms(1);
hasebems 0:c54d59d6fb78 68
hasebems 0:c54d59d6fb78 69 // 10. SFTRST : 0x00
hasebems 0:c54d59d6fb78 70 writeSingleCPP(26, 0x00);
hasebems 0:c54d59d6fb78 71
hasebems 0:c54d59d6fb78 72 // 11. wait 30msec
hasebems 0:c54d59d6fb78 73 wait_ms(30);
hasebems 0:c54d59d6fb78 74
hasebems 0:c54d59d6fb78 75 // 12. AP1 AP3: "0"
hasebems 0:c54d59d6fb78 76 writeSingleCPP(2, 0x04);
hasebems 0:c54d59d6fb78 77
hasebems 0:c54d59d6fb78 78 // 13. wait 10usec
hasebems 0:c54d59d6fb78 79 wait_us(10);
hasebems 0:c54d59d6fb78 80
hasebems 0:c54d59d6fb78 81 // 14. AP2: "0"
hasebems 0:c54d59d6fb78 82 writeSingleCPP(2, 0x00);
hasebems 0:c54d59d6fb78 83
hasebems 0:c54d59d6fb78 84 writeSingleCPP(25, 0xcc); // -32[dB]
hasebems 0:c54d59d6fb78 85 writeSingleCPP(27, 0x3f); // set itp max
hasebems 0:c54d59d6fb78 86 writeSingleCPP(20, 0x00); // set itp on
hasebems 0:c54d59d6fb78 87 writeSingleCPP(3, 0x01); // amp gain(6.5[dB])
hasebems 0:c54d59d6fb78 88 writeSingleCPP(9, 0xf8); // Sequencer Volume
hasebems 0:c54d59d6fb78 89 }