>> 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. >> Does anybody familiar with the AT91 have any ideas what school boy type >> error I might be making? > Did you enable the clock to the GPIO subsystem? Output works without a > clock, input does not. Look in i think the power management section of > the manual. > Andrew No, I didn't even know there was a GPIO subsystem that needs a clock, but now I know that fixed it: HAL_WRITE_UINT32 (AT91_PMC + AT91_PMC_PCER, AT91_PMC_PCER_PIOA); Thanks Andrew, there is only brief mention of it in the 757 page AT91SAM7 manual, so it might have taken me awhile to chance upon it. Regards, 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
