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Code Issues Releases Activity

f4 usb_dcd: disable FIFO empty IRQ while waiting for tx completion

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CPU was being hammered with FIFO empty IRQs if we queued data but
the host wasn't actively draining the FIFO.

This was entirely unexpected so this hack should probably be
removed once we can figure out why this was happening.

This is almost certainly hiding some other issue.
This commit is contained in:
Stacey Sheldon 2012-03-05 22:37:50 -05:00
parent c4bd286739
commit 3210bd3f9c
1 changed files with 8 additions and 3 deletions
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11
flight/PiOS/STM32F4xx/Libraries/STM32_USB_OTG_Driver/src/usb_dcd_int.c
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@ -670,8 +670,6 @@ static uint32_t DCD_WriteEmptyTxFifo(USB_OTG_CORE_HANDLE *pdev, uint32_t epnum)
len32b = (len + 3) / 4;
txstatus.d32 = USB_OTG_READ_REG32( &pdev->regs.INEP_REGS[epnum]->DTXFSTS);
while (txstatus.b.txfspcavail > len32b &&
ep->xfer_count < ep->xfer_len &&
ep->xfer_len != 0)
@ -692,7 +690,14 @@ static uint32_t DCD_WriteEmptyTxFifo(USB_OTG_CORE_HANDLE *pdev, uint32_t epnum)
txstatus.d32 = USB_OTG_READ_REG32(&pdev->regs.INEP_REGS[epnum]->DTXFSTS);
}
if (ep->xfer_count == ep->xfer_len || ep->xfer_len == 0) {
/* Turn off the Fifo Empty Interrupt */
uint32_t fifoemptymsk;
fifoemptymsk = 0x1 << epnum;
USB_OTG_MODIFY_REG32(&pdev->regs.DREGS->DIEPEMPMSK, fifoemptymsk, 0);
}
return 1;
}