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arch/arm/src/lpc43xx/lpc43_sdmmc.c: This commit corrects a problem in lpc43_dmasendsetup(). There was no linked DMA descriptor code on the send side. The end result was stalls while sending multiple sectors. This commit addes that in and the send code is working much better.

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Dave Marples 2018-10-23 10:47:52 -06:00 committed by Gregory Nutt
parent 729b2e1907
commit 98f268b303
1 changed files with 52 additions and 5 deletions
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57
arch/arm/src/lpc43xx/lpc43_sdmmc.c
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@ -196,7 +196,7 @@
* Eg. Fsd = 44MHz, ticks = 660,000
*/
#define DEBOUNCE_TICKS (15 * BOARD_SDMMC_FREQUENCY / 1000)
#define DEBOUNCE_TICKS (15 * (BOARD_SDMMC_FREQUENCY / 1000))
/****************************************************************************
* Private Types
@ -2581,6 +2581,9 @@ static int lpc43_dmasendsetup(FAR struct sdio_dev_s *dev,
{
struct lpc43_dev_s *priv = (struct lpc43_dev_s *)dev;
uint32_t regval;
uint32_t ctrl;
uint32_t maxs;
int i;
/* Don't bother with DMA if the entire transfer will fit in the TX FIFO or
* if we do not have a 4-bit wide bus.
@ -2631,10 +2634,54 @@ static int lpc43_dmasendsetup(FAR struct sdio_dev_s *dev,
/* Setup DMA descriptor list */
g_sdmmc_dmadd[0].des0 = MCI_DMADES0_OWN | MCI_DMADES0_CH | MCI_DMADES0_LD;
g_sdmmc_dmadd[0].des1 = 512;
g_sdmmc_dmadd[0].des2 = (uint32_t)priv->buffer;
g_sdmmc_dmadd[0].des3 = (uint32_t)&g_sdmmc_dmadd[1];
i = 0;
while (buflen > 0)
{
/* Limit size of the transfer to maximum buffer size */
maxs = buflen;
if (maxs > MCI_DMADES1_MAXTR)
{
maxs = MCI_DMADES1_MAXTR;
}
buflen -= maxs;
/* Set buffer size */
g_sdmmc_dmadd[i].des1 = MCI_DMADES1_BS1(maxs);
/* Setup buffer address (chained) */
g_sdmmc_dmadd[i].des2 = (uint32_t)priv->buffer + (i * MCI_DMADES1_MAXTR);
/* Setup basic control */
ctrl = MCI_DMADES0_OWN | MCI_DMADES0_CH;
if (i == 0)
{
ctrl |= MCI_DMADES0_FS; /* First DMA buffer */
}
/* No more data? Then this is the last descriptor */
if (buflen == 0)
{
ctrl |= MCI_DMADES0_LD;
}
else
{
ctrl |= MCI_DMADES0_DIC;
}
/* Another descriptor is needed */
g_sdmmc_dmadd[i].des0 = ctrl;
g_sdmmc_dmadd[i].des3 = (uint32_t)&g_sdmmc_dmadd[i + 1];
i++;
}
lpc43_putreg((uint32_t) &g_sdmmc_dmadd[0], LPC43_SDMMC_DBADDR);