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toggle GPIO with DMA on ADC conversion finish (STM32F407)

Question asked by fachet.benjamin on Oct 22, 2013
Latest reply on Oct 28, 2013 by fachet.benjamin

is it possible to configure a DMA job to toggle an GPIO when the ADC conversion finishes?
I'am using Timer8 to Trigger ADC1 conversion and DMA2 Stream0 Channel0 to copy the conversion result (DR-Register) to internal RAM.

Now, for testing purpose only, i want to toggle Pin C5 at the end of the ADC conversion using this DMA config:

st_DMA_ADCtoRAM.DMA_PeripheralBaseAddr = (uint32_t)GPIOC_BASE + 0x18; // 0x18 = BSRR-Register Offset  
st_DMA_ADCtoRAM.DMA_Memory0BaseAddr =    (uint32_t)au32_TestOut;                                       
st_DMA_ADCtoRAM.DMA_DIR = DMA_DIR_MemoryToPeripheral;                                                 
st_DMA_ADCtoRAM.DMA_BufferSize = 2;

#define TESTHIGH (1<< 5    )
#define TESTLOW  (1<<(5+16))
au32_TestOut[0] = TESTHIGH;
au32_TestOut[1] = TESTLOW;

but this doesn't work. DMA2 Stream4 Channel0 deosn't work either:
DMA_Cmd(DMA2_Stream4, DISABLE);
st_TESTtoGPIO_Config.DMA_Channel = DMA_Channel_0;
st_TESTtoGPIO_Config.DMA_PeripheralBaseAddr = (uint32_t)GPIOC_BASE + 0x18; // 0x18 = BSRR-Register Offset
st_TESTtoGPIO_Config.DMA_Memory0BaseAddr =    (uint32_t)au32_TestOut;
st_TESTtoGPIO_Config.DMA_DIR = DMA_DIR_MemoryToPeripheral;
st_TESTtoGPIO_Config.DMA_BufferSize = 2;
st_TESTtoGPIO_Config.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
st_TESTtoGPIO_Config.DMA_MemoryInc = DMA_MemoryInc_Enable;
st_TESTtoGPIO_Config.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word; 
st_TESTtoGPIO_Config.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
st_TESTtoGPIO_Config.DMA_Mode = DMA_Mode_Circular;
st_TESTtoGPIO_Config.DMA_Priority = DMA_Priority_Low;
st_TESTtoGPIO_Config.DMA_FIFOMode = DMA_FIFOMode_Disable;
st_TESTtoGPIO_Config.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
st_TESTtoGPIO_Config.DMA_MemoryBurst = DMA_MemoryBurst_Single;
st_TESTtoGPIO_Config.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA2_Stream4, &st_TESTtoGPIO_Config);
DMA_Cmd(DMA2_Stream4, ENABLE);