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Posted to commits@nuttx.apache.org by GitBox <gi...@apache.org> on 2022/05/02 06:42:19 UTC

[GitHub] [incubator-nuttx] lupyuen commented on issue #5810: GPIO issues on BL602 + suggestions for RISC-V, maybe more.

lupyuen commented on issue #5810:
URL: https://github.com/apache/incubator-nuttx/issues/5810#issuecomment-1114545507

   We have just implemented a GPIO Expander that fixes the above issues for BL602 and BL604:
   
   -   Support 23 GPIOs with any mix of GPIO Inputs / Outputs / Interrupts
   
   -   Renumber the GPIOs as "/dev/gpio0" to "/dev/gpio22", which are simply mapped as GPIO 0 to GPIO 22
   
   -   Allow gaps in the GPIO Numbering, skipping the GPIOs reserved for UART, I2C, SPI and PWM
   
   -   Keep the BL602 EVB Pin Definitions (`board.h`), so that BL602 EVB will still build OK without GPIO Expander
   
   -   Validate the GPIOs at startup
   
   More details in this article...
   
   -   ["NuttX GPIO Expander for PineDio Stack BL604"](https://lupyuen.github.io/articles/expander)
   


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