please see the below comments listed chronologically by a customer. any guidance will be appreciated
- working with the CYW43907. I’m having some problems configuring GPIOs. There are two pins that I’m having a hard time configuring – PWM5 and I2S_MCLK0. I’m setting I2S_MCLK0 to use GPIO_23 so PWM5 has to use GPIO_8. We’re using most of the GPIO-named pins, but GPIO_9 is free. I’m following this post to try and shuffle GPIO functions around in order to use GPIO_9: https://community.infineon.com/t5/Resource-Library/CYW43907-GPIO-Explained/ta-p/246150.
I’m trying to remap GPIO pins as follows:
PIN_GPIO_8 > GPIO_16
PIN_GPIO_16 > GPIO_10
PIN_GPIO_10 > GPIO_1
PIN_GPIO_1 > GPIO_9
I’ve made some changes to the pin function selections in “platform_pinmux.c” – specifically I’ve changed a few PIN_FUNCTION_TYPE_GPIO types to PIN_FUNCTION_TYPE_UNKNOWN – in order to guide the affected GPIO pins to the alternate GPIO functions. After making these changes, I’m able to call “wiced_gpio_init” successfully for all pins. However, the remapped GPIO pins don’t work; they only seem to work for the GPIO functions specified by the pin names. Am I misunderstanding the pin multiplexing table and the GPIO pins can only use the same as pin functions? Any thoughts about what I’m doing wrong?
- the work-around:
The issue has been resolved. What I found is that there are a few pins that need to initialize using one of the alternate GPIO’s, if the first one is picked, then later on there are a few that won’t have a GPIO peripheral available on the pad, so they fail to initialize. To fix this, I moved the platform_pinmux.c module up into the project level platform, and removed all but one GPIO peripheral from the pin mapping.
- Regarding the work-around that Justin mentioned – this works fine for the non-GPIO pins (like PIN_PWM5), but the GPIO pins (e.g. PIN_GPIO_0) don’t seem to work with the alternate GPIO functions that are listed in the pin multiplexing table. I need to move several of the GPIO pins to alternate GPIO functions to get a free slot for all our GPIOs.
