119 lines
2.5 KiB
C
119 lines
2.5 KiB
C
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#include "ch.h"
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#include "hal.h"
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#include "chprintf.h"
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#include "serial_output.h"
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#include "sound.h"
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// This is called when the board boots up with the user button pressed. The
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// idea is to enter this mode if the wrong SPI device has been used and flashing
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// is no longer possible.
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__attribute__ ((noreturn))
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static void lockdown( void )
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{
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palSetPad( GPIOD , GPIOD_LED3 );
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while (TRUE) {
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// EMPTY
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}
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}
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static int increment;
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static int curPos;
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static const s16 sinTable[16384] = {
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#include "sin_table.h"
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};
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void debug(void)
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{
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chprintf( (void*)&SD2 , "I2S:\r\n" );
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chprintf( (void*)&SD2 , " CR2 %x\r\n" , SPI3->CR2 );
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chprintf( (void*)&SD2 , " SR %x\r\n" , SPI3->SR );
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chprintf( (void*)&SD2 , " CFG %x\r\n" , SPI3->I2SCFGR );
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chprintf( (void*)&SD2 , " PR %x\r\n" , SPI3->I2SPR );
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chprintf( (void*)&SD2 , "DMA:\r\n" );
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chprintf( (void*)&SD2 , " CR %x\r\n" ,
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SPID3.dmatx->stream->CR );
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chprintf( (void*)&SD2 , " NDT %x\r\n" ,
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SPID3.dmatx->stream->NDTR );
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chprintf( (void*)&SD2 , " PAR %x\r\n" ,
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SPID3.dmatx->stream->PAR );
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chprintf( (void*)&SD2 , " M0A %x\r\n" ,
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SPID3.dmatx->stream->M0AR );
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chprintf( (void*)&SD2 , " M1A %x\r\n" ,
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SPID3.dmatx->stream->M1AR );
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chprintf( (void*)&SD2 , " FCR %x\r\n" ,
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SPID3.dmatx->stream->FCR );
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chprintf( (void*)&SD2 , "curPos: %d\r\n" , curPos );
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}
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__attribute__ ((noreturn))
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int main( void )
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{
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halInit();
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chSysInit();
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if ( palReadPad( GPIOA , GPIOA_BUTTON ) ) {
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lockdown( );
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}
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soInit( );
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chprintf( (void*)&SD2 , "Sound card initialisation\r\n" );
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sndInit( 11025 );
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chprintf( (void*)&SD2 ,
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"Sound card initialisation complete\r\n" );
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increment = 654; // 16384 * 440 / 11025
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curPos = 0;
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debug( );
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#ifdef USE_DMA_FOR_SEXY_BEEPS
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int i = 0;
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while ( 1 ) {
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s16 * buffer = sndGetBuffer( );
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if ( buffer == NULL ) {
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i ++;
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if ( i == 2000000 ) {
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i = 0;
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palTogglePad( GPIOD , GPIOD_LED4 );
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debug( );
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}
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continue;
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}
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palTogglePad( GPIOD , GPIOD_LED3 );
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int z;
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for ( z = 0 ; z < SND_BUFSIZE / 2 ; z ++ ) {
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buffer[ z * 2 ] = buffer[ z * 2 + 1 ]
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= sinTable[ curPos ];
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curPos = ( curPos + increment / 2 ) % 16384;
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}
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}
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#else // USE_DMA_FOR_SEXY_BEEPS
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int i = 0;
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while ( 1 ) {
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u16 sr = SPI3->SR;
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if ( ( sr & 0x2 ) == 0 ) {
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continue;
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}
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SPI3->DR = sinTable[ curPos ];
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if ( ( sr & 0x4 ) == 0 ) {
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curPos = ( curPos + increment ) % 16384;
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}
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i ++;
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if ( i == 22100 ) {
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i = 0;
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palTogglePad( GPIOD , GPIOD_LED4 );
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debug( );
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}
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}
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#endif // USE_DMA_FOR_SEXY_BEEPS
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}
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