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NUC505 : added comment on DMA choice

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This commit is contained in:
Peter Lawrence 2020-03-16 13:20:17 -05:00
parent fb56c02a6f
commit df05440d92
1 changed files with 9 additions and 3 deletions
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12
src/portable/nuvoton/nuc505/dcd_nuc505.c
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@ -33,6 +33,12 @@
nomenclature of EPA through EPL.
*/
/*
Note on OPT_MCU_NUC505_USB_DMA: the author suggests against using this option.
The DMA functionality of the USBD peripheral does not appear to succeed with
transfer lengths that are longer (> 64 bytes) and are not a multiple of 4.
*/
#include "tusb_option.h"
#if TUSB_OPT_DEVICE_ENABLED && (CFG_TUSB_MCU == OPT_MCU_NUC505)
@ -211,7 +217,7 @@ static void bus_reset(void)
current_dma_xfer = NULL;
}
#if 0
#ifdef OPT_MCU_NUC505_USB_DMA
/* this must only be called by the ISR; it does its best to share the single DMA engine across all user EPs (IN and OUT) */
static void service_dma(void)
{
@ -467,7 +473,7 @@ void USBD_IRQHandler(void)
if (bus_state & USBD_BUSINTSTS_DMADONEIF_Msk)
{
#if 0
#ifdef OPT_MCU_NUC505_USB_DMA
if (current_dma_xfer)
{
current_dma_xfer->dma_requested = false;
@ -601,7 +607,7 @@ void USBD_IRQHandler(void)
if (out_ep)
{
#if 0
#ifdef OPT_MCU_NUC505_USB_DMA
xfer->dma_requested = true;
service_dma();
#else