Tool/software:
I want to use the DMA to read in the PORTA on a rising edge from a GPIO.
To do this, I have configured the DMA as follows:
uint32_t testSource = 1553;
/* Configure DMA source, destination and size */
DL_DMA_setSrcAddr(DMA, DMA_CH0_RX_CHAN_ID,
(uint32_t)&GPIOA->DIN31_0); // DIN31_0 = DIN pin 31 bis pin0
// DL_DMA_setSrcAddr(DMA, DMA_CH0_RX_CHAN_ID, (uint32_t)&testSource);
// // DIN31_0 = DIN pin 31 bis pin0
DL_DMA_setDestAddr(DMA, DMA_CH0_RX_CHAN_ID, (uint32_t)&gDesRxDmaData[0]);
DL_DMA_setTransferSize(DMA, DMA_CH0_RX_CHAN_ID,
sizeof(gDesRxDmaData) / sizeof(uint32_t));
DL_DMA_enableChannel(DMA, DMA_CH0_RX_CHAN_ID);
test = DL_DMA_getSrcAddr(DMA, DMA_CH0_RX_CHAN_ID);
__BKPT(0);
However, with this code I always read back the value 0. Although some pins are always high (and are also set correctly when reading back registers with the debugger).
If I set the source addr to a test variable, the value of the variable is also read correctly with the DMA.
Therefore the DMA initialization actually works, but something is wrong with the Source Addr on GPIOA->DIN31_0.
Is there something wrong with this Addr?
If I set the source addr to a test variable, the value of the variable is also read correctly with the DMA.
Therefore the DMA initialization actually works, but something is wrong with the Source Addr on GPIOA->DIN31_0.
Is there something wrong with this Addr?
