I'm fairly new to AT91 and have been trying to use the platform macros to setup and read some GPIOs on an Olimex AT91SAM7S256 based board.
They provide their board pre-flashed with a demo program (no source) and you can press the micro switches to toggle/activate various board features using the program. The switches are externally pulled up. With ecos, I can configure any gpio as an output and set it high or low without any problems, but when it comes to reading a pin's value it seems to always return 0 regardless of the logic level on it. cyg_bool value HAL_ARM_AT91_GPIO_CFG_DIRECTION(AT91_GPIO_PA29, AT91_PIN_IN); HAL_ARM_AT91_GPIO_GET(AT91_GPIO_PA29, value); 'value' is always 0. I've tried a couple of different boards in case the first one has been damaged somehow and different pins in case there is a perculiarity with a particular mulifunction pin. Also: cyg_uint32 pdsr; HAL_READ_UINT32(AT91_PIO + AT91_PIO_PDSR, pdsr); The pdsr status register never seems to change its value when the external logic level is changed. The only example I can find is in the AT91 usb driver on the power pin. Does anybody familiar with the AT91 have any ideas what school boy type error I might be making? Thanks, Steven -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss
