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Fix workaround logic

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1124 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2008-11-02 22:34:35 +00:00
parent 4cb20b0d4c
commit 8ebe322536
1 changed files with 12 additions and 6 deletions
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18
configs/mcu123-lpc214x/src/up_spi.c
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@ -154,11 +154,16 @@ static void spi_select(FAR struct spi_dev_s *dev, boolean selected)
while (!(getreg8(LPC214X_SPI1_SR) & LPC214X_SPI1SR_TNF));
putreg16(0xff, LPC214X_SPI1_DR);
/* Then wait until TX FIFO and TX shift buffer are empty */
/* Wait until TX FIFO and TX shift buffer are empty */
while (getreg8(LPC214X_SPI1_SR) & LPC214X_SPI1SR_BSY);
/* Wait until RX FIFO is not empty */
while (!(getreg8(LPC214X_SPI1_SR) & LPC214X_SPI1SR_RNE));
/* Then read and discard bytes until the RX FIFO is empty */
do
{
(void)getreg16(LPC214X_SPI1_DR);
@ -290,7 +295,7 @@ static void spi_sndblock(FAR struct spi_dev_s *dev, FAR const ubyte *buffer, siz
}
}
/* Then discard all card responses until the TX FIFO is emptied. */
/* Then discard all card responses until the RX & TX FIFOs are emptied. */
do
{
@ -304,12 +309,13 @@ static void spi_sndblock(FAR struct spi_dev_s *dev, FAR const ubyte *buffer, siz
(void)getreg16(LPC214X_SPI1_DR);
}
/* There is a race condition where TFE may go FALSE just before
* RNE goes true. The nasty little delay in the following solves
* that (it could probably be tuned to improve performance).
/* There is a race condition where TFE may go TRUE just before
* RNE goes true and this loop terminates prematurely. The nasty little
* delay in the following solves that (it could probably be tuned
* to improve performance).
*/
else if ((sr & LPC214X_SPI1SR_TFE) == 0)
else if ((sr & LPC214X_SPI1SR_TFE) != 0)
{
up_udelay(100);
sr = getreg8(LPC214X_SPI1_SR);