diff options
Diffstat (limited to 'nuttx/configs/sam3u-ek/src/sam3u-ek.h')
| -rw-r--r-- | nuttx/configs/sam3u-ek/src/sam3u-ek.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/nuttx/configs/sam3u-ek/src/sam3u-ek.h b/nuttx/configs/sam3u-ek/src/sam3u-ek.h index 21e0e2649..df53985cf 100644 --- a/nuttx/configs/sam3u-ek/src/sam3u-ek.h +++ b/nuttx/configs/sam3u-ek/src/sam3u-ek.h @@ -138,7 +138,12 @@ #define GPIO_LCD_BKL (GPIO_OUTPUT|GPIO_CFG_DEFAULT|GPIO_OUTPUT_CLEAR|GPIO_PORT_PIOC|GPIO_PIN19) -/* Touchscreen controller (TSC) */ +/* Touchscreen controller (TSC) + * + * BUSY is high impedance when CS is high (not selected). When CS is + * is low, BUSY is active high. Since the pin is pulled up, it will appear + * busy if CS is not selected. + */ #define GPIO_TCS_IRQ (GPIO_INPUT|GPIO_CFG_PULLUP|GPIO_PORT_PIOA|GPIO_PIN24) #define GPIO_TCS_BUSY (GPIO_INPUT|GPIO_CFG_PULLUP|GPIO_PORT_PIOA|GPIO_PIN2) |