DMA transfer inside ISR: Problem

Hi!

Thanks for reply!

Yes, DMA_IRQ_INTERRUPT_CONTROLLER_ID is the id of my VIC - is 0 because in my project i have only 1 VIC - from system.h:# define DMA_BASE 0x2903440# define DMA_IRQ 0# define DMA_IRQ_INTERRUPT_CONTROLLER_ID 0

If I don't use the isr_context i have the same result....when the irq is generated the program crashed! I try to test te program with a interrupt from the UART and it works fine. If I use the HAL driver it also works fine; but I will read the status register of DMA during the ISR to detect if IRQ is generated by a EOP or length = 0. If I use the HAL driver and I read the status register in the ISR, the status register is always 0, so i will write my driver. My test code is simple:

in main:

IOWR_ALTERA_AVALON_UART_DIVISOR(SERIAL_UART_BASE,108); // Baud Rate: 921600 @ 100Mhz

IOWR_ALTERA_AVALON_UART_EOP(SERIAL_UART_BASE,'\r'); // Serial Uart EOP: '\r

alt_u8* buffer;

alt_ic_isr_register( DMA_IRQ_INTERRUPT_CONTROLLER_ID,

DMA_IRQ,

DMA_isr,

NULL,

NULL);

IOWR_ALTERA_AVALON_DMA_STATUS(DMA_BASE, 0);

IOWR_ALTERA_AVALON_DMA_RADDRESS(DMA_BASE, SERIAL_UART_BASE);

IOWR_ALTERA_AVALON_DMA_WADDRESS(DMA_BASE, buffer);

IOWR_ALTERA_AVALON_DMA_LENGTH(DMA_BASE, 5); // transfer length = 5

IOWR_ALTERA_AVALON_DMA_CONTROL(DMA_BASE, 0x1F9); // enable IRQ -set single transfer lenght @ 8 bits (1 char) - enable transfer

while (1) {

usleep(1000000);

printf("length: 0x%X\n",IORD_ALTERA_AVALON_DMA_LENGTH(DMA_BASE)); //to test if DMA recive data (for every recived char the length decrease - it works fine)

}

and this is the ISR routine:

static void DMA_isr (void* handle) {

printf("IRQ \n");

}

The result is that when the program is running the length decrease an wher the length = 0 or the EOP \r is recived the program crash!

No, I don't enable a seperate exception stack. (look hal.jpg)

Regards