Posted on July 24, 2015 at 12:41Hi All,
I am using STM32F429 running at 180Mhz.
I am trying to transfer data from SRAM Location 0x20005000 to GPIO I
using Timer1 Ch1 as capture through external Clock of 20Mhz
Data Size is 8 Bits
Using Direct Mode
FIFO Interrupt is not enabled
I have defined
DMA_Memory0BaseAddr as 0x20005000
Memory Increment Enabled
FIFO Mode Disabled
Memory Data Size = Byte
DMA_PeripheralBaseAddr as (uint32_t)&GPIOI->ODR
Peripheral Increment Disabled
FIFO Mode Disabled
Peripheral Data Size = Byte
Direction = Memory to Peripheral
Using DMA2 Stream6
When I use the Above configuration , I do get the Transfer Complete and Half Transfer Interrupts but also FIFO Error Interrupt Flag.
Scope not showing any data transfer on Port I
But when I interchange the Memory and Peripheral Addresses
with the corresponding changes
DMA_Memory0BaseAddr as (uint32_t)&GPIOI->ODR (previously 0x20005000)
Memory Increment Disabled ( Previously Enabled)
DMA_PeripheralBaseAddr as 0x20005000 (previously (uint32_t)&GPIOI->ODR )
Peripheral Increment Enabled (previously Disabled)
Direction = Peripheral to Memory (previously Memory to Peripheral)
Other parameter being unchanged.Results:
FIFO Error Interrupt flag is not seen.
TCIF and HTIF are set.
Data is also visible on the Port I.Can someone explain this behavior
Regards,
Pankaj
#stm32-dma
