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