Posted on May 17, 2011 at 13:00Hi,
I'm playing with an STM32-P103 from Olimex. I started with the ADC DMA example 1, ported it to the target board and removed the SPI functions (not needed for me).
I have a structure;
typedef struct {
u16 dma_buf[ADC_BLEN];
u16 pipe[ADC_PIPE];
u16 head, tail;
u16 status;
u32 int_rms, rms;
} adc_t;
in main.h, and declare a variable
adc_t adc;
in main.c, and as
extern adc_t adc;
in stm32f10x_it.c.
main.c has the needed stuff in the DMA setup I think..
DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;
DMA_InitStructure.DMA_MemoryBaseAddr = (u32) &(adc.dma_buf);
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = ADC_BLEN;
Now, if I set ADC_BLEN to 512, it runs. If I set to 1024, I get a HardFault.
I removed all references to the variable 'adc' from the DMA ISR, and still the same.
I'm building with CodeSourcery tools, and it compiles and links cleanly with -Wall.
Is there some problem, or limitation, WRT defining the buffer for DMA?
Regards,
James.
