81 lines
2.4 KiB
C
81 lines
2.4 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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// Usage Model:
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//
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// pyb.switch() returns True if the user switch is pressed, False otherwise.
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//
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// pyb.switch(callback) will register a callback to be called when the user
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// switch is pressed.
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//
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// pyb.switch(None) will remove the callback.
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//
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// Example:
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//
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// def switch_pressed():
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// print("User Switch pressed")
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//
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// pyb.switch(switch_pressed)
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static mp_obj_t switch_user_callback_obj;
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static mp_obj_t switch_callback(mp_obj_t line) {
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if (switch_user_callback_obj != mp_const_none) {
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mp_call_function_0(switch_user_callback_obj);
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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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// 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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// this function inits the callback pointer
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void switch_init(void) {
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switch_user_callback_obj = mp_const_none;
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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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static mp_obj_t pyb_switch(uint n_args, mp_obj_t *args) {
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if (n_args == 0) {
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return switch_get() ? mp_const_true : mp_const_false;
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} else {
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switch_user_callback_obj = args[0];
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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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switch_user_callback_obj == 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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}
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MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_switch_obj, 0, 1, pyb_switch);
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