Hello,
I am not sure if this is the right place, but there is a problem I face in the SDK and fixed, and I thought I should mention it here.
I am programming on NXP i.MX RT1170 and was trying to use the eDMA to transfer some video lines, but it failed miserably! it never complete the whole lines, when I was trying to do 288 line it moved only around 40 lines (I am trying to move 288 lines by doing 288 scatter gather operations).
The hardware doesn't seem to have such restrictions, and the TCD blocks are stored in external memory anyway!
I dug into the driver and found out that the function which set the size of TCD block has the following form:
void EDMA_InstallTCDMemory(edma_handle_t *handle, edma_tcd_t *tcdPool, uint32_t tcdSize)
But in the body of the function I found the following:
void EDMA_InstallTCDMemory(edma_handle_t *handle, edma_tcd_t *tcdPool, uint32_t tcdSize)
{
assert(handle != NULL);
assert(((uint32_t)tcdPool & 0x1FU) == 0U);
handle->header = 1;
handle->tcdUsed = 0;
handle->tcdSize = (int8_t)tcdSize; // !!!!!!!!!
handle->flags = 0;
handle->tcdPool = tcdPool;
}
It converts the uint32_t integer into int8 integer !
That means the maximum size I can transfer is only 128! (which is the case)
And by digging more into the driver I found that the handle data and other functions uses int8_t type for no obvious reason.
After modifying it all into uint16_t it worked seamlessly for me.
I hope this can be modified in future version of the drivers.
Regards
