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#include <stdio.h>
#include "stm32f4xx_hal.h"
#include "misc.h"
#include "mpconfig.h"
#include "qstr.h"
#include "obj.h"
#include "runtime.h"
#include "extint.h"
#include "pin.h"
#include "genhdr/pins.h"
#include "usrsw.h"
#if MICROPY_HW_HAS_SWITCH
// Usage Model:
//
// sw = pyb.Switch() # create a switch object
// sw() # get state (True if pressed, False otherwise)
// sw.callback(f) # register a callback to be called when the
// # switch is pressed down
// sw.callback(None) # remove the callback
//
// Example:
//
// pyb.Switch().callback(lambda: pyb.LED(1).toggle())
// this function inits the switch GPIO so that it can be used
void switch_init0(void) {
GPIO_InitTypeDef init;
init.Pin = MICROPY_HW_USRSW_PIN.pin_mask;
init.Mode = GPIO_MODE_INPUT;
init.Pull = MICROPY_HW_USRSW_PULL;
init.Speed = GPIO_SPEED_FAST;
HAL_GPIO_Init(MICROPY_HW_USRSW_PIN.gpio, &init);
}
int switch_get(void) {
int val = ((MICROPY_HW_USRSW_PIN.gpio->IDR & MICROPY_HW_USRSW_PIN.pin_mask) != 0);
return val == MICROPY_HW_USRSW_PRESSED;
}
/******************************************************************************/
// Micro Python bindings
typedef struct _pyb_switch_obj_t {
mp_obj_base_t base;
mp_obj_t callback;
} pyb_switch_obj_t;
STATIC pyb_switch_obj_t pyb_switch_obj;
void pyb_switch_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
print(env, "Switch()");
}
STATIC mp_obj_t pyb_switch_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp_obj_t *args) {
// check arguments
mp_arg_check_num(n_args, n_kw, 0, 0, false);
// init the switch object
pyb_switch_obj.base.type = &pyb_switch_type;
// No need to clear the callback member: if it's already been set and registered
// with extint then we don't want to reset that behaviour. If it hasn't been set,
// then no extint will be called until it is set via the callback method.
// return static switch object
return (mp_obj_t)&pyb_switch_obj;
}
mp_obj_t pyb_switch_call(mp_obj_t self_in, uint n_args, uint n_kw, const mp_obj_t *args) {
// get switch state
mp_arg_check_num(n_args, n_kw, 0, 0, false);
return switch_get() ? mp_const_true : mp_const_false;
}
STATIC mp_obj_t switch_callback(mp_obj_t line) {
if (pyb_switch_obj.callback != mp_const_none) {
mp_call_function_0(pyb_switch_obj.callback);
}
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(switch_callback_obj, switch_callback);
mp_obj_t pyb_switch_callback(mp_obj_t self_in, mp_obj_t callback) {
pyb_switch_obj_t *self = self_in;
self->callback = callback;
// Init the EXTI each time this function is called, since the EXTI
// may have been disabled by an exception in the interrupt, or the
// user disabling the line explicitly.
extint_register((mp_obj_t)&MICROPY_HW_USRSW_PIN,
MICROPY_HW_USRSW_EXTI_MODE,
MICROPY_HW_USRSW_PULL,
callback == mp_const_none ? mp_const_none : (mp_obj_t)&switch_callback_obj,
true, NULL);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(pyb_switch_callback_obj, pyb_switch_callback);
STATIC const mp_map_elem_t pyb_switch_locals_dict_table[] = {
{ MP_OBJ_NEW_QSTR(MP_QSTR_callback), (mp_obj_t)&pyb_switch_callback_obj },
};
STATIC MP_DEFINE_CONST_DICT(pyb_switch_locals_dict, pyb_switch_locals_dict_table);
const mp_obj_type_t pyb_switch_type = {
{ &mp_type_type },
.name = MP_QSTR_Switch,
.print = pyb_switch_print,
.make_new = pyb_switch_make_new,
.call = pyb_switch_call,
.locals_dict = (mp_obj_t)&pyb_switch_locals_dict,
};
#endif // MICROPY_HW_HAS_SWITCH
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