Using a CYW43907 based radio module; What is the proper way to add functions onto pins?
A) Drive the pin directly by first initializing then toggling it.
- Initializing and driving seems to work for several GPIO pins I tried including GPIO_0, GPIO_8, GPIO_10 and GPIO_12. I can initialize these pins, toggle them, then observe the output using CYW943907AEVAL1F kit. Disclaimer: I haven’t yet observed the toggling of GPIO_8 as that signal isn’t easy to probe before it goes through a switch chip at U15.
- Initializing fails for PWM_5. Starting with TCP_Server and CYW943907AEVAL1F, attempting to initialize PWM_5 hangs the code.
Following code added to TCP_SERVER Project main.c file for CYW943907AEVAL1F.
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cy_rslt_t result;
result = cyhal_gpio_init( PIN_GPIO_12, CYHAL_GPIO_DIR_OUTPUT, CYHAL_GPIO_DRIVE_STRONG, false );
if( result == CY_RSLT_SUCCESS )
printf( " PIN_GPIO_12 Initialization succeeded.\r\n" );
else printf( " PIN_GPIO_12 Initialization failed.\r\n" );
cyhal_gpio_toggle( PIN_GPIO_12 );
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GPIOs 12, 10, 0 and 8 initialize and send text to terminal window on PC
Observed signals: GPIO_10 @ J12-4, GPIO_12 @ J12-5 and GPIO_0 @ J10-1 toggle as expected. I haven’t found an easy way to probe GPIO_8 before U15.
B) Drive a signal that can be multiplexed onto the pin
Since I can’t find what else is driving PWM_5, and I can’t reinitialize it, I’d like to try to multiplex onto it.
How can I re-assign PWM_5 to use it as a GPIO?
When the following code to initialize PWM_5 is active, the radio locks up. The code builds fine, programs and runs through the point where it prints “Ready to initialize PIN_PWM_5” to the terminal. Then appear to stop.
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printf( " Ready to Initialize PIN_PWM_5.\r\n" );
result = cyhal_gpio_init( PIN_PWM_5, CYHAL_GPIO_DIR_OUTPUT, CYHAL_GPIO_DRIVE_STRONG, false );
if( result == CY_RSLT_SUCCESS )
printf( " PIN_PWM_5 Initialization succeeded.\r\n" );
else printf( " PIN_PWM_5 Initialization failed.\r\n" );
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Is there an Application Note that describes the method to multiplex pins using ModusToolbox?
Note: I do have a separate question into the community on formart required for multiplexing @ Format of code to Multiplex pins using ModusToolbox
Greg
