diff options
| author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2011-10-08 00:37:18 +0000 |
|---|---|---|
| committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2011-10-08 00:37:18 +0000 |
| commit | c87ac73912d8d1dc36944c52526f13d24301cd7a (patch) | |
| tree | 3ac469cc8242aa9eabf5d99f8fafeee25e167f34 /nuttx/configs/sam3u-ek/src/sam3uek_internal.h | |
| parent | 77fac8557262940319c3fa3bc473866d4bb90450 (diff) | |
| download | px4-nuttx-c87ac73912d8d1dc36944c52526f13d24301cd7a.tar.gz px4-nuttx-c87ac73912d8d1dc36944c52526f13d24301cd7a.tar.bz2 px4-nuttx-c87ac73912d8d1dc36944c52526f13d24301cd7a.zip | |
SAM3U: Add logic to bypass automated control of SPI chip selects
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4032 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/configs/sam3u-ek/src/sam3uek_internal.h')
| -rw-r--r-- | nuttx/configs/sam3u-ek/src/sam3uek_internal.h | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/nuttx/configs/sam3u-ek/src/sam3uek_internal.h b/nuttx/configs/sam3u-ek/src/sam3uek_internal.h index 1aa66d517..5b5138960 100644 --- a/nuttx/configs/sam3u-ek/src/sam3uek_internal.h +++ b/nuttx/configs/sam3u-ek/src/sam3uek_internal.h @@ -164,9 +164,17 @@ /* SPI Chip Selects */ -/* Chip select pin connected to the touchscreen controller and to ZigBee module connector. */ +/* Chip select pin connected to the touchscreen controller and to the ZigBee module + * connector. Notice that the touchscreen chip select is implemented as a GPIO + * OUTPUT that must be controlled by board-specific. This is because the ADS7843E + * driver must be able to sample the device BUSY GPIO input between SPI transfers. + * However, the AD7843E will tri-state the BUSY input whenever the chip select is + * de-asserted. So the only option is to control the chip select manually and hold + * it low throughout the SPI transfer. + */ -#define GPIO_TSC_NPCS2 GPIO_SPI0_NPCS2_3 +#define GPIO_TSC_NPCS2 (GPIO_OUTPUT|GPIO_CFG_PULLUP|GPIO_OUTPUT_SET|\ + GPIO_PORT_PIOC|GPIO_PIN14) /************************************************************************************ * Public Types |