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Hopefully fix the underrun issue when reading from HD disks.

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This commit is contained in:
David Given
2019-03-27 22:10:58 +01:00
parent 098b2371a4
commit 707563bec6
1 changed files with 7 additions and 6 deletions
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13
FluxEngine.cydsn/main.c
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@@ -340,12 +340,6 @@ static void cmd_read(struct read_frame* f)
goto abort;
}
while (USBFS_GetEPState(FLUXENGINE_DATA_IN_EP_NUM) != USBFS_IN_BUFFER_EMPTY)
{
if (index_irq || dma_underrun)
goto abort;
}
uint8_t dma_buffer_usage = 0;
while (dma_buffer_usage < BUFFER_SIZE)
{
@@ -356,6 +350,12 @@ static void cmd_read(struct read_frame* f)
count++;
if (cs.outputlen == 0)
{
while (USBFS_GetEPState(FLUXENGINE_DATA_IN_EP_NUM) != USBFS_IN_BUFFER_EMPTY)
{
if (index_irq || dma_underrun)
goto abort;
}
USBFS_LoadInEP(FLUXENGINE_DATA_IN_EP_NUM, usb_buffer, BUFFER_SIZE);
cs.outputptr = usb_buffer;
cs.outputlen = BUFFER_SIZE;
@@ -364,6 +364,7 @@ static void cmd_read(struct read_frame* f)
dma_reading_from_td = NEXT_BUFFER(dma_reading_from_td);
}
abort:
//debug("count=%d i=%d d=%d", count, index_irq, dma_underrun);
CyDmaChSetRequest(dma_channel, CY_DMA_CPU_TERM_CHAIN);
while (CyDmaChGetRequest(dma_channel))
;