Posted on May 17, 2011 at 12:51Hi STOne,
Using the cpu to trigger it - not the debugger. (We're not using the eval board but our own prototype).
To cause the error we set up the dma to write from an array (internal stm32 memory) to External SRam, with : Transfer Complete Interrupt Enabled and Transfer Error Interrupt Enabled.
When the interrupt triggers 'complete' we reload the dma and set it going again, same array, 10 bytes, same target(0x68000000). If it errors we have a while(1) to catch it there - crude i know but it works.
While this is going on in the main loop we have:
while(1)
{
a1 = (a1 +4) & 0xFFFF;
*((unsigned int *)(0x68000000 +a1)) = 0x123456;
};
Both the while loop and the DMA work on their own, (if I comment the write in the while loop it works, or if I comment the dma enable line it works)
but together it gets stuck in the while loop.
(the sram is on bank3, its just a crude example project demonstrate the problem - on the main project we're using an ethernet chip on bank2, sram on 3 and sram on 4. We first saw the problem working between the ethernet chip and the sram, in the crude example we're not using the second sram or ethernet chip so they're not causing the problem)
Thanks,
Giles
[ This message was edited by: giles on 07-11-2008 09:57 ]
