Waveplayer with STM3210E-Eval

[elgerta]

Posted on March 16, 2011 at 18:02

Waveplayer with STM3210E-Eval

[Tesla DeLorean]

Posted on May 17, 2011 at 14:28

Maybe someone has an idea which point I've looked over.

Attached the important files which are changed.

Unless I missed it, you have no time base initialization for TIM6 Like the TIM_PrescalerConfig or TIM_TimeBaseInit   /* TIM6 Configuration */   TIM_PrescalerConfig(TIM6, 0xF, TIM_PSCReloadMode_Update);   TIM_SetAutoreload(TIM6, 0xFF);   /* TIM6 TRGO selection */   TIM_SelectOutputTrigger(TIM6, TIM_TRGOSource_Update); OR   /* TIM6 Configuration */   /* Time base configuration */   TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);   TIM_TimeBaseStructure.TIM_Period = 0x19;   TIM_TimeBaseStructure.TIM_Prescaler = 0x0;   TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;   TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;   TIM_TimeBaseInit(TIM6, &TIM_TimeBaseStructure);   /* TIM6 TRGO selection */   TIM_SelectOutputTrigger(TIM6, TIM_TRGOSource_Update);

[elgerta]

Posted on May 17, 2011 at 14:28

Okay TIM6 is working now with related frequency of the wave file.

But I've still some problem of understanding. The stm32f10x_it.c has a DMA IRQ handler but seems not enabled. On the other side, inside the loop while (WaveDataLength) of the functions WavePlayerMenu_Start() at waveplayer.c, the DMA1_Channel3->CCR will be set with 0x00 and 0x2091 which means channel enable but transfer interrupt is disabled. And I can't follow the code of TIM6_DAC_IRQHandler(). For me not clear to use only Wavebuffer??     DAC_SetChannel1Data(DAC_Align_8b_R, Wavebuffer[wavecounter++]);     if (wavecounter == 511)     {       wavecounter = 0;       DFS_ReadFile(&fiwave, sector, Wavebuffer, &var, SECTOR_SIZE);     } Maybe the guy from ST can give some explanations. Regards Achim

[Tesla DeLorean]

Posted on May 17, 2011 at 14:28

If it is interrupt driven, you could use Wavebuffer or whatever you want. I'd personally use a ping-pong construct, and get more data in the foreground.

The wavecounter is also wrong.     DAC_SetChannel1Data(DAC_Align_8b_R, Wavebuffer[wavecounter++]);     if (wavecounter == 512) // Not 511     {

..

[elgerta]

Posted on May 17, 2011 at 14:28

Maybe I'm wrong but the flowchart of the demo shows a sequence like ping-pong with two different buffers which are transfered via DMA.

Due to this I don't understand the code of void TIM6_DAC_IRQHandler(void) {   if (TIM_GetITStatus(TIM6, TIM_IT_Update) != RESET)   {     /* Set DAC Channel1 DHR register */     DAC_SetChannel1Data(DAC_Align_8b_R, Wavebuffer[wavecounter++]);     if (wavecounter == 511)     {       wavecounter = 0;       DFS_ReadFile(&fiwave, sector, Wavebuffer, &var, SECTOR_SIZE);     }       /* If we reach the WaveDataLength of the wave to play */     if (Decrement_WaveDataLength() == 0)     {       /* Stop wave playing */       WavePlayer_Stop();     }     /* Clear TIM6 update interrupt */     TIM_ClearITPendingBit(TIM6, TIM_IT_Update);   } } where the transfer is via a single buffer. And this in addition of the ping-pong at waveplayer.c It seems wrong?? Regards Achim