mimxrt: no longer need to collect the pin chainge interrupt ptrs

.. the objects on the gc heap are guaranteed to be alive, as their
finali(s/z)er will disable the interrupt.

Author: jepler

ports/mimxrt10xx/common-hal/microcontroller/Pin.c

@@ -119,8 +119,3 @@ void claim_pin(const mcu_pin_obj_t *pin) {
 void common_hal_mcu_pin_reset_number(uint8_t pin_no) {
     common_hal_reset_pin((mcu_pin_obj_t *)(mcu_pin_globals.map.table[pin_no].value));
 }
-
-// The 'data' pointers may be to gc objects, they must be kept alive.
-void pin_gc_collect() {
-    gc_collect_root((void **)&pcid, sizeof(pcid) / sizeof(void *));
-}

ports/mimxrt10xx/peripherals/mimxrt10xx/pins.c

@@ -1,5 +1,10 @@
 #include "peripherals/mimxrt10xx/pins.h"
 
+typedef struct {
+    gpio_change_interrupt_t *func;
+    void *data;
+} pin_change_interrupt_data;
+
 /* Array of GPIO peripheral base address. */
 static GPIO_Type *const s_gpioBases[] = GPIO_BASE_PTRS;
 static uint32_t GPIO_GetInstance(GPIO_Type *base) {
@@ -23,7 +28,7 @@ static uint32_t GPIO_GetInstance(GPIO_Type *base) {
 static const IRQn_Type low_irqs[] = GPIO_COMBINED_LOW_IRQS;
 static const IRQn_Type high_irqs[] = GPIO_COMBINED_HIGH_IRQS;
 
-volatile pin_change_interrupt_data pcid[MP_ARRAY_SIZE(s_gpioBases)][32];
+static volatile pin_change_interrupt_data pcid[MP_ARRAY_SIZE(s_gpioBases)][32];
 
 void enable_pin_change_interrupt(const mcu_pin_obj_t *pin, gpio_change_interrupt_t func, void *data) {
     int instance = GPIO_GetInstance(pin->gpio);

ports/mimxrt10xx/peripherals/mimxrt10xx/pins.h

@@ -73,12 +73,6 @@ typedef struct {
     }
 
 typedef void (gpio_change_interrupt_t)(void *data);
-typedef struct {
-    gpio_change_interrupt_t *func;
-    void *data;
-} pin_change_interrupt_data;
-extern volatile pin_change_interrupt_data pcid[MP_ARRAY_SIZE((GPIO_Type *const[])GPIO_BASE_PTRS)][32];
-
 void disable_pin_change_interrupt(const mcu_pin_obj_t *pin);
 void enable_pin_change_interrupt(const mcu_pin_obj_t *pin, gpio_change_interrupt_t func, void *data);
 

ports/mimxrt10xx/supervisor/port.c

@@ -555,10 +555,6 @@ void port_idle_until_interrupt(void) {
     common_hal_mcu_enable_interrupts();
 }
 
-void port_gc_collect(void) {
-    pin_gc_collect();
-}
-
 // Catch faults where the memory access violates MPU settings.
 void MemManage_Handler(void);
 __attribute__((used)) void PLACE_IN_ITCM(MemManage_Handler)(void) {