PWM on PB.10 and PB.11 with DMA and TIMER2(CH3 e CH4)

[esiqueira]

Posted on June 28, 2012 at 19:38

How can I configure PWM on TIMER2 (CH3 and CH4)?

I would like to configure CH4 in other Channel of the DMA, but looks that only run on Channel 2.

 /* Configuracoes DMA */

 DMA_DeInit(DMA1_Channel2);  DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(&TIM2->CCR3);       // Associa Periferico  //DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(&TIM2->CCR4);       // Associa Periferico  DMA_InitStructure.DMA_MemoryBaseAddr = (u32)PWM_Buffer;     // Associa Memoria  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;  DMA_InitStructure.DMA_BufferSize = PWM_ELEMENTS;  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;  DMA_InitStructure.DMA_Priority = DMA_Priority_High;  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;  DMA_Init(DMA1_Channel2, &DMA_InitStructure);    /* Habilita Canal 2 - DMA1*/  DMA_Cmd(DMA1_Channel2, ENABLE); #dma-timer2-ch3-ch4-pb.10-pb.11

[Tesla DeLorean]

Posted on June 28, 2012 at 19:57

DMA1_Channel2 is driven by TIM2_UP, and only that channel.

A 32-bit transfer doesn't help as the two 16-bit registers you want to write are too far apart.

[esiqueira]

Posted on June 28, 2012 at 21:38

THANKS CLIVE1,