With the latest (RC8, 9) versions of MMBasic software, it’s no longer necessary, or even possible to replace gpio.c and gpio.h in the SDK. MMBasic now uses the stock SDK and these files are no longer included in the source distros. This is good news for us! It means no one has to make sure the latest MMBasic and SDK are synchronized. It’s a little less work for people who want to keep up with the latest source.
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From the PicoMite github
Build with sdk V2.2.0 but replace gpio.c with the one included here. Note the change in gpio.c is just to set the gpio interrupt to be in ram
static void __not_in_flash_func(gpio_default_irq_handler)(void) {