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micropython/stmhal/led.c

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#include <stdio.h>
#include <stm32f4xx_hal.h>
#include "mpconfig.h"
#include "nlr.h"
#include "misc.h"
#include "qstr.h"
#include "obj.h"
#include "runtime.h"
#include "timer.h"
#include "led.h"
#include "pin.h"
#include "genhdr/pins.h"
/// \moduleref pyb
/// \class LED - LED object
///
/// The LED object controls an individual LED (Light Emitting Diode).
typedef struct _pyb_led_obj_t {
mp_obj_base_t base;
machine_uint_t led_id;
const pin_obj_t *led_pin;
} pyb_led_obj_t;
STATIC const pyb_led_obj_t pyb_led_obj[] = {
{{&pyb_led_type}, 1, &MICROPY_HW_LED1},
#if defined(MICROPY_HW_LED2)
{{&pyb_led_type}, 2, &MICROPY_HW_LED2},
#if defined(MICROPY_HW_LED3)
{{&pyb_led_type}, 3, &MICROPY_HW_LED3},
#if defined(MICROPY_HW_LED4)
{{&pyb_led_type}, 4, &MICROPY_HW_LED4},
#endif
#endif
#endif
};
#define NUM_LEDS ARRAY_SIZE(pyb_led_obj)
void led_init(void) {
/* GPIO structure */
GPIO_InitTypeDef GPIO_InitStructure;
/* Configure I/O speed, mode, output type and pull */
GPIO_InitStructure.Speed = GPIO_SPEED_LOW;
GPIO_InitStructure.Mode = MICROPY_HW_LED_OTYPE;
GPIO_InitStructure.Pull = GPIO_NOPULL;
/* Turn off LEDs and initialize */
for (int led = 0; led < NUM_LEDS; led++) {
const pin_obj_t *led_pin = pyb_led_obj[led].led_pin;
MICROPY_HW_LED_OFF(led_pin);
GPIO_InitStructure.Pin = led_pin->pin_mask;
HAL_GPIO_Init(led_pin->gpio, &GPIO_InitStructure);
}
#if defined(PYBV4) || defined(PYBV10)
// LED4 (blue) is on PB4 which is TIM3_CH1
// we use PWM on this channel to fade the LED
// LED3 (yellow) is on PA15 which has TIM2_CH1, so we could PWM that as well
// GPIO configuration
GPIO_InitStructure.Pin = MICROPY_HW_LED4.pin_mask;
GPIO_InitStructure.Mode = GPIO_MODE_AF_PP;
GPIO_InitStructure.Speed = GPIO_SPEED_FAST;
GPIO_InitStructure.Pull = GPIO_NOPULL;
GPIO_InitStructure.Alternate = GPIO_AF2_TIM3;
HAL_GPIO_Init(MICROPY_HW_LED4.gpio, &GPIO_InitStructure);
// PWM mode configuration
TIM_OC_InitTypeDef oc_init;
oc_init.OCMode = TIM_OCMODE_PWM1;
oc_init.Pulse = 0; // off
oc_init.OCPolarity = TIM_OCPOLARITY_HIGH;
oc_init.OCFastMode = TIM_OCFAST_DISABLE;
HAL_TIM_PWM_ConfigChannel(&TIM3_Handle, &oc_init, TIM_CHANNEL_1);
// start PWM
TIM_CCxChannelCmd(TIM3, TIM_CHANNEL_1, TIM_CCx_ENABLE);
#endif
}
void led_state(pyb_led_t led, int state) {
if (led < 1 || led > NUM_LEDS) {
return;
}
#if defined(PYBV4) || defined(PYBV10)
if (led == 4) {
if (state) {
TIM3->CCR1 = 0xffff;
} else {
TIM3->CCR1 = 0;
}
return;
}
#endif
const pin_obj_t *led_pin = pyb_led_obj[led - 1].led_pin;
//printf("led_state(%d,%d)\n", led, state);
if (state == 0) {
// turn LED off
MICROPY_HW_LED_OFF(led_pin);
} else {
// turn LED on
MICROPY_HW_LED_ON(led_pin);
}
}
void led_toggle(pyb_led_t led) {
if (led < 1 || led > NUM_LEDS) {
return;
}
#if defined(PYBV4) || defined(PYBV10)
if (led == 4) {
if (TIM3->CCR1 == 0) {
TIM3->CCR1 = 0xffff;
} else {
TIM3->CCR1 = 0;
}
return;
}
#endif
const pin_obj_t *led_pin = pyb_led_obj[led - 1].led_pin;
GPIO_TypeDef *gpio = led_pin->gpio;
// We don't know if we're turning the LED on or off, but we don't really
// care. Just invert the state.
if (gpio->ODR & led_pin->pin_mask) {
// pin is high, make it low
gpio->BSRRH = led_pin->pin_mask;
} else {
// pin is low, make it high
gpio->BSRRL = led_pin->pin_mask;
}
}
int led_get_intensity(pyb_led_t led) {
if (led < 1 || led > NUM_LEDS) {
return 0;
}
#if defined(PYBV4) || defined(PYBV10)
if (led == 4) {
machine_uint_t i = (TIM3->CCR1 * 255 + (USBD_CDC_POLLING_INTERVAL*1000) - 2) / ((USBD_CDC_POLLING_INTERVAL*1000) - 1);
if (i > 255) {
i = 255;
}
return i;
}
#endif
const pin_obj_t *led_pin = pyb_led_obj[led - 1].led_pin;
GPIO_TypeDef *gpio = led_pin->gpio;
// TODO convert high/low to on/off depending on board
if (gpio->ODR & led_pin->pin_mask) {
// pin is high
return 255;
} else {
// pin is low
return 0;
}
}
void led_set_intensity(pyb_led_t led, machine_int_t intensity) {
#if defined(PYBV4) || defined(PYBV10)
if (led == 4) {
// set intensity using PWM pulse width
if (intensity < 0) {
intensity = 0;
} else if (intensity >= 255) {
intensity = 0xffff;
} else {
intensity = intensity * ((USBD_CDC_POLLING_INTERVAL*1000) - 1) / 255;
}
TIM3->CCR1 = intensity;
return;
}
#endif
// intensity not supported for this LED; just turn it on/off
led_state(led, intensity > 0);
}
void led_debug(int n, int delay) {
led_state(1, n & 1);
led_state(2, n & 2);
led_state(3, n & 4);
led_state(4, n & 8);
HAL_Delay(delay);
}
/******************************************************************************/
/* Micro Python bindings */
void led_obj_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
pyb_led_obj_t *self = self_in;
print(env, "<LED %lu>", self->led_id);
}
/// \classmethod \constructor(id)
/// Create an LED object associated with the given LED:
///
/// - `id` is the LED number, 1-4.
STATIC mp_obj_t led_obj_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, 1, 1, false);
// get led number
machine_int_t led_id = mp_obj_get_int(args[0]);
// check led number
if (!(1 <= led_id && led_id <= NUM_LEDS)) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "LED %d does not exist", led_id));
}
// return static led object
return (mp_obj_t)&pyb_led_obj[led_id - 1];
}
/// \method on()
/// Turn the LED on.
mp_obj_t led_obj_on(mp_obj_t self_in) {
pyb_led_obj_t *self = self_in;
led_state(self->led_id, 1);
return mp_const_none;
}
/// \method off()
/// Turn the LED off.
mp_obj_t led_obj_off(mp_obj_t self_in) {
pyb_led_obj_t *self = self_in;
led_state(self->led_id, 0);
return mp_const_none;
}
/// \method toggle()
/// Toggle the LED between on and off.
mp_obj_t led_obj_toggle(mp_obj_t self_in) {
pyb_led_obj_t *self = self_in;
led_toggle(self->led_id);
return mp_const_none;
}
/// \method intensity([value])
/// Get or set the LED intensity. Intensity ranges between 0 (off) and 255 (full on).
/// If no argument is given, return the LED intensity.
/// If an argument is given, set the LED intensity and return `None`.
mp_obj_t led_obj_intensity(uint n_args, const mp_obj_t *args) {
pyb_led_obj_t *self = args[0];
if (n_args == 1) {
return mp_obj_new_int(led_get_intensity(self->led_id));
} else {
led_set_intensity(self->led_id, mp_obj_get_int(args[1]));
return mp_const_none;
}
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(led_obj_on_obj, led_obj_on);
STATIC MP_DEFINE_CONST_FUN_OBJ_1(led_obj_off_obj, led_obj_off);
STATIC MP_DEFINE_CONST_FUN_OBJ_1(led_obj_toggle_obj, led_obj_toggle);
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(led_obj_intensity_obj, 1, 2, led_obj_intensity);
STATIC const mp_map_elem_t led_locals_dict_table[] = {
{ MP_OBJ_NEW_QSTR(MP_QSTR_on), (mp_obj_t)&led_obj_on_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_off), (mp_obj_t)&led_obj_off_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_toggle), (mp_obj_t)&led_obj_toggle_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_intensity), (mp_obj_t)&led_obj_intensity_obj },
};
STATIC MP_DEFINE_CONST_DICT(led_locals_dict, led_locals_dict_table);
const mp_obj_type_t pyb_led_type = {
{ &mp_type_type },
.name = MP_QSTR_LED,
.print = led_obj_print,
.make_new = led_obj_make_new,
.locals_dict = (mp_obj_t)&led_locals_dict,
};
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