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SAMDL: SPI must be disabled before changing the mode bits in CTRLA register

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This commit is contained in:
Matt Thompson
2018-01-17 17:23:05 -08:00
parent bd70ac9c2f
commit d7cc0c7368
1 changed files with 6 additions and 1 deletions
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arch/arm/src/samdl/sam_spi.c
+6 -1
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@@ -944,7 +944,12 @@ static void spi_setmode(struct spi_dev_s *dev, enum spi_mode_e mode)
{
/* Yes... Set the mode appropriately */
/* First we need to disable SPI while we change the mode */
regval = spi_getreg32(priv, SAM_SPI_CTRLA_OFFSET);
spi_putreg32(priv, regval & ~SPI_CTRLA_ENABLE, SAM_SPI_CTRLA_OFFSET);
spi_wait_synchronization(priv);
regval &= ~(SPI_CTRLA_CPOL | SPI_CTRLA_CPHA);
switch (mode)
@@ -969,7 +974,7 @@ static void spi_setmode(struct spi_dev_s *dev, enum spi_mode_e mode)
return;
}
spi_putreg32(priv, regval, SAM_SPI_CTRLA_OFFSET);
spi_putreg32(priv, regval | SPI_CTRLA_ENABLE, SAM_SPI_CTRLA_OFFSET);
/* Save the mode so that subsequent re-configurations will be faster */