circuitpython/stm/usrsw.c

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#include <stdio.h>
#include <stm32f4xx.h>
#include "misc.h"
#include "mpconfig.h"
#include "qstr.h"
#include "obj.h"
#include "runtime.h"
#include "usrsw.h"
#include "exti.h"
#include "gpio.h"
#include "pin.h"
#include "build/pins.h"
// Usage Model:
//
// pyb.switch() returns True if the user switch is pressed, False otherwise.
//
// pyb.switch(callback) will register a callback to be called when the user
// switch is pressed.
//
// pyb.switch(None) will remove the callback.
//
// Example:
//
// def switch_pressed():
// print("User Switch pressed")
//
// pyb.switch(switch_pressed)
static mp_obj_t switch_user_callback_obj;
static mp_obj_t switch_callback(mp_obj_t line) {
if (switch_user_callback_obj != mp_const_none) {
rt_call_function_0(switch_user_callback_obj);
}
return mp_const_none;
}
static MP_DEFINE_CONST_FUN_OBJ_1(switch_callback_obj, switch_callback);
void switch_init(void) {
switch_user_callback_obj = mp_const_none;
exti_register((mp_obj_t)&USRSW_PIN,
MP_OBJ_NEW_SMALL_INT(EXTI_Mode_Interrupt),
MP_OBJ_NEW_SMALL_INT(USRSW_EXTI_EDGE),
(mp_obj_t)&switch_callback_obj,
NULL);
pyb_gpio_input((mp_obj_t)&USRSW_PIN, MP_OBJ_NEW_SMALL_INT(USRSW_PUPD));
}
int switch_get(void) {
int val = ((USRSW_PIN.gpio->IDR & USRSW_PIN.pin_mask) != 0);
return val == USRSW_PRESSED;
}
/******************************************************************************/
/* Micro Python bindings */
static mp_obj_t pyb_switch(uint n_args, mp_obj_t *args) {
if (n_args == 0) {
return switch_get() ? mp_const_true : mp_const_false;
}
switch_user_callback_obj = args[0];
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_switch_obj, 0, 1, pyb_switch);