void WS2812_PrintBuffer(void){
if(DMA_Status() != IDLE){ // handle error case where DMA channel is busy
// you can wait for it to finish in the background, but this
// will crash if not initialized, and even if it recovers,
return; // the data will immediately follow and thus not be displayed
}
DMA_Transfer((uint8_t *)buffer, 1728, 2); // send 18 LEDs with each ping-pong; send 2 ping-pongs
}
int main(void) {
uint8_t red, green, blue;
DMA_Init();
for (;;) {
DMA_Transfer(transmitBuf, sizeof(transmitBuf));
}
/* Never leave main */
return 0;
}
/* SB_Poll performs DMA transfers and fills the Direct Sound Buffer */
static DWORD CALLBACK SB_Poll( void *dummy )
{
HRESULT result;
LPBYTE lpbuf1 = NULL;
LPBYTE lpbuf2 = NULL;
DWORD dwsize1 = 0;
DWORD dwsize2 = 0;
DWORD dwbyteswritten1 = 0;
DWORD dwbyteswritten2 = 0;
int size;
/* FIXME: this loop must be improved */
while(!end_sound_loop)
{
Sleep(10);
if (dma_enable) {
size = DMA_Transfer(SB_DMA,min(DMATRFSIZE,SamplesCount),dma_buffer);
} else
continue;
result = IDirectSoundBuffer_Lock(lpdsbuf,buf_off,size,(LPVOID *)&lpbuf1,&dwsize1,(LPVOID *)&lpbuf2,&dwsize2,0);
if (result != DS_OK) {
ERR("Unable to lock sound buffer !\n");
continue;
}
dwbyteswritten1 = min(size,dwsize1);
memcpy(lpbuf1,dma_buffer,dwbyteswritten1);
if (size>dwsize1) {
dwbyteswritten2 = min(size - dwbyteswritten1,dwsize2);
memcpy(lpbuf2,dma_buffer+dwbyteswritten1,dwbyteswritten2);
}
buf_off = (buf_off + dwbyteswritten1 + dwbyteswritten2) % DSBUFLEN;
result = IDirectSoundBuffer_Unlock(lpdsbuf,lpbuf1,dwbyteswritten1,lpbuf2,dwbyteswritten2);
if (result!=DS_OK)
ERR("Unable to unlock sound buffer !\n");
SamplesCount -= size;
if (!SamplesCount) {
DOSVM_QueueEvent(SB_IRQ,SB_IRQ_PRI,NULL,NULL);
dma_enable = 0;
}
}
return 0;
}