kopia lustrzana https://github.com/micropython/micropython
402 wiersze
12 KiB
C
402 wiersze
12 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013-2016 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdio.h>
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#include "py/runtime.h"
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#include "py/mphal.h"
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#include "timer.h"
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#include "led.h"
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#include "pin.h"
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#if defined(MICROPY_HW_LED1)
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/// \moduleref pyb
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/// \class LED - LED object
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///
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/// The LED object controls an individual LED (Light Emitting Diode).
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// the default is that LEDs are not inverted, and pin driven high turns them on
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#ifndef MICROPY_HW_LED_INVERTED
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#define MICROPY_HW_LED_INVERTED (0)
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#endif
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typedef struct _pyb_led_obj_t {
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mp_obj_base_t base;
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mp_uint_t led_id;
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const machine_pin_obj_t *led_pin;
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} pyb_led_obj_t;
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static const pyb_led_obj_t pyb_led_obj[] = {
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{{&pyb_led_type}, 1, MICROPY_HW_LED1},
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#if defined(MICROPY_HW_LED2)
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{{&pyb_led_type}, 2, MICROPY_HW_LED2},
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#if defined(MICROPY_HW_LED3)
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{{&pyb_led_type}, 3, MICROPY_HW_LED3},
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#if defined(MICROPY_HW_LED4)
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{{&pyb_led_type}, 4, MICROPY_HW_LED4},
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#if defined(MICROPY_HW_LED5)
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{{&pyb_led_type}, 5, MICROPY_HW_LED5},
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#if defined(MICROPY_HW_LED6)
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{{&pyb_led_type}, 6, MICROPY_HW_LED6},
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#endif
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#endif
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#endif
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#endif
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#endif
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};
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#define NUM_LEDS MP_ARRAY_SIZE(pyb_led_obj)
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void led_init(void) {
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/* Turn off LEDs and initialize */
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for (int led = 0; led < NUM_LEDS; led++) {
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const machine_pin_obj_t *led_pin = pyb_led_obj[led].led_pin;
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mp_hal_gpio_clock_enable(led_pin->gpio);
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MICROPY_HW_LED_OFF(led_pin);
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mp_hal_pin_output(led_pin);
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}
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}
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#if defined(MICROPY_HW_LED1_PWM) \
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|| defined(MICROPY_HW_LED2_PWM) \
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|| defined(MICROPY_HW_LED3_PWM) \
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|| defined(MICROPY_HW_LED4_PWM) \
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|| defined(MICROPY_HW_LED5_PWM) \
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|| defined(MICROPY_HW_LED6_PWM)
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// The following is semi-generic code to control LEDs using PWM.
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// It currently supports TIM1, TIM2 and TIM3, channels 1-4.
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// Configure by defining the relevant MICROPY_HW_LEDx_PWM macros in mpconfigboard.h.
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// If they are not defined then PWM will not be available for that LED.
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#define LED_PWM_ENABLED (1)
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#ifndef MICROPY_HW_LED1_PWM
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#define MICROPY_HW_LED1_PWM { NULL, 0, 0, 0 }
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#endif
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#ifndef MICROPY_HW_LED2_PWM
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#define MICROPY_HW_LED2_PWM { NULL, 0, 0, 0 }
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#endif
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#ifndef MICROPY_HW_LED3_PWM
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#define MICROPY_HW_LED3_PWM { NULL, 0, 0, 0 }
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#endif
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#ifndef MICROPY_HW_LED4_PWM
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#define MICROPY_HW_LED4_PWM { NULL, 0, 0, 0 }
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#endif
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#ifndef MICROPY_HW_LED5_PWM
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#define MICROPY_HW_LED5_PWM { NULL, 0, 0, 0 }
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#endif
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#ifndef MICROPY_HW_LED6_PWM
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#define MICROPY_HW_LED6_PWM { NULL, 0, 0, 0 }
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#endif
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#define LED_PWM_TIM_PERIOD (10000) // TIM runs at 1MHz and fires every 10ms
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// this gives the address of the CCR register for channels 1-4
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#define LED_PWM_CCR(pwm_cfg) ((volatile uint32_t *)&(pwm_cfg)->tim->CCR1 + ((pwm_cfg)->tim_channel >> 2))
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typedef struct _led_pwm_config_t {
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TIM_TypeDef *tim;
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uint8_t tim_id;
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uint8_t tim_channel;
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uint8_t alt_func;
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} led_pwm_config_t;
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static const led_pwm_config_t led_pwm_config[] = {
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MICROPY_HW_LED1_PWM,
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MICROPY_HW_LED2_PWM,
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MICROPY_HW_LED3_PWM,
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MICROPY_HW_LED4_PWM,
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MICROPY_HW_LED5_PWM,
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MICROPY_HW_LED6_PWM,
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};
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static uint8_t led_pwm_state = 0;
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static inline bool led_pwm_is_enabled(int led) {
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return (led_pwm_state & (1 << led)) != 0;
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}
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// this function has a large stack so it should not be inlined
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static void led_pwm_init(int led) __attribute__((noinline));
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static void led_pwm_init(int led) {
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const machine_pin_obj_t *led_pin = pyb_led_obj[led - 1].led_pin;
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const led_pwm_config_t *pwm_cfg = &led_pwm_config[led - 1];
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// GPIO configuration
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mp_hal_pin_config(led_pin, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, pwm_cfg->alt_func);
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// TIM configuration
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switch (pwm_cfg->tim_id) {
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case 1:
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__TIM1_CLK_ENABLE();
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break;
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case 2:
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__TIM2_CLK_ENABLE();
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break;
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#if defined(TIM3)
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case 3:
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__TIM3_CLK_ENABLE();
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break;
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#endif
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default:
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assert(0);
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}
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TIM_HandleTypeDef tim = {0};
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tim.Instance = pwm_cfg->tim;
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tim.Init.Period = LED_PWM_TIM_PERIOD - 1;
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tim.Init.Prescaler = timer_get_source_freq(pwm_cfg->tim_id) / 1000000 - 1; // TIM runs at 1MHz
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tim.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
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tim.Init.CounterMode = TIM_COUNTERMODE_UP;
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tim.Init.RepetitionCounter = 0;
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HAL_TIM_PWM_Init(&tim);
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// PWM configuration
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TIM_OC_InitTypeDef oc_init;
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oc_init.OCMode = TIM_OCMODE_PWM1;
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oc_init.Pulse = 0; // off
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oc_init.OCPolarity = MICROPY_HW_LED_INVERTED ? TIM_OCPOLARITY_LOW : TIM_OCPOLARITY_HIGH;
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oc_init.OCFastMode = TIM_OCFAST_DISABLE;
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oc_init.OCNPolarity = TIM_OCNPOLARITY_HIGH; // needed for TIM1 and TIM8
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oc_init.OCIdleState = TIM_OCIDLESTATE_SET; // needed for TIM1 and TIM8
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oc_init.OCNIdleState = TIM_OCNIDLESTATE_SET; // needed for TIM1 and TIM8
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HAL_TIM_PWM_ConfigChannel(&tim, &oc_init, pwm_cfg->tim_channel);
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HAL_TIM_PWM_Start(&tim, pwm_cfg->tim_channel);
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// indicate that this LED is using PWM
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led_pwm_state |= 1 << led;
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}
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static void led_pwm_deinit(int led) {
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// make the LED's pin a standard GPIO output pin
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const machine_pin_obj_t *led_pin = pyb_led_obj[led - 1].led_pin;
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GPIO_TypeDef *g = led_pin->gpio;
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uint32_t pin = led_pin->pin;
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static const int mode = 1; // output
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static const int alt = 0; // no alt func
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g->MODER = (g->MODER & ~(3 << (2 * pin))) | (mode << (2 * pin));
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g->AFR[pin >> 3] = (g->AFR[pin >> 3] & ~(15 << (4 * (pin & 7)))) | (alt << (4 * (pin & 7)));
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led_pwm_state &= ~(1 << led);
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}
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#else
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#define LED_PWM_ENABLED (0)
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#endif
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void led_state(pyb_led_t led, int state) {
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if (led < 1 || led > NUM_LEDS) {
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return;
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}
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const machine_pin_obj_t *led_pin = pyb_led_obj[led - 1].led_pin;
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if (state == 0) {
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// turn LED off
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MICROPY_HW_LED_OFF(led_pin);
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} else {
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// turn LED on
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MICROPY_HW_LED_ON(led_pin);
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}
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#if LED_PWM_ENABLED
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if (led_pwm_is_enabled(led)) {
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led_pwm_deinit(led);
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}
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#endif
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}
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void led_toggle(pyb_led_t led) {
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if (led < 1 || led > NUM_LEDS) {
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return;
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}
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#if LED_PWM_ENABLED
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if (led_pwm_is_enabled(led)) {
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// if PWM is enabled then LED has non-zero intensity, so turn it off
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led_state(led, 0);
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return;
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}
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#endif
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// toggle the output data register to toggle the LED state
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const machine_pin_obj_t *led_pin = pyb_led_obj[led - 1].led_pin;
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led_pin->gpio->ODR ^= led_pin->pin_mask;
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}
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int led_get_intensity(pyb_led_t led) {
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if (led < 1 || led > NUM_LEDS) {
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return 0;
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}
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#if LED_PWM_ENABLED
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if (led_pwm_is_enabled(led)) {
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const led_pwm_config_t *pwm_cfg = &led_pwm_config[led - 1];
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mp_uint_t i = (*LED_PWM_CCR(pwm_cfg) * 255 + LED_PWM_TIM_PERIOD - 2) / (LED_PWM_TIM_PERIOD - 1);
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if (i > 255) {
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i = 255;
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}
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return i;
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}
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#endif
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const machine_pin_obj_t *led_pin = pyb_led_obj[led - 1].led_pin;
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GPIO_TypeDef *gpio = led_pin->gpio;
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if (gpio->ODR & led_pin->pin_mask) {
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// pin is high
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return MICROPY_HW_LED_INVERTED ? 0 : 255;
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} else {
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// pin is low
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return MICROPY_HW_LED_INVERTED ? 255 : 0;
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}
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}
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void led_set_intensity(pyb_led_t led, mp_int_t intensity) {
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#if LED_PWM_ENABLED
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if (intensity > 0 && intensity < 255) {
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const led_pwm_config_t *pwm_cfg = &led_pwm_config[led - 1];
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if (pwm_cfg->tim != NULL) {
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// set intensity using PWM pulse width
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if (!led_pwm_is_enabled(led)) {
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led_pwm_init(led);
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}
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*LED_PWM_CCR(pwm_cfg) = intensity * (LED_PWM_TIM_PERIOD - 1) / 255;
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return;
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}
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}
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#endif
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// intensity not supported for this LED; just turn it on/off
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led_state(led, intensity > 0);
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}
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void led_debug(int n, int delay) {
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led_state(1, n & 1);
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led_state(2, n & 2);
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led_state(3, n & 4);
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led_state(4, n & 8);
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mp_hal_delay_ms(delay);
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}
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/******************************************************************************/
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/* MicroPython bindings */
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void led_obj_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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pyb_led_obj_t *self = MP_OBJ_TO_PTR(self_in);
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mp_printf(print, "LED(%u)", self->led_id);
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}
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/// \classmethod \constructor(id)
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/// Create an LED object associated with the given LED:
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///
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/// - `id` is the LED number, 1-4.
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static mp_obj_t led_obj_make_new(const mp_obj_type_t *type, size_t n_args, size_t 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, 1, 1, false);
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// get led number
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mp_int_t led_id = mp_obj_get_int(args[0]);
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// check led number
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if (!(1 <= led_id && led_id <= NUM_LEDS)) {
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mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("LED(%d) doesn't exist"), led_id);
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}
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// return static led object
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return MP_OBJ_FROM_PTR(&pyb_led_obj[led_id - 1]);
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}
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/// \method on()
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/// Turn the LED on.
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mp_obj_t led_obj_on(mp_obj_t self_in) {
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pyb_led_obj_t *self = MP_OBJ_TO_PTR(self_in);
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led_state(self->led_id, 1);
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return mp_const_none;
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}
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/// \method off()
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/// Turn the LED off.
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mp_obj_t led_obj_off(mp_obj_t self_in) {
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pyb_led_obj_t *self = MP_OBJ_TO_PTR(self_in);
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led_state(self->led_id, 0);
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return mp_const_none;
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}
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/// \method toggle()
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/// Toggle the LED between on and off.
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mp_obj_t led_obj_toggle(mp_obj_t self_in) {
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pyb_led_obj_t *self = MP_OBJ_TO_PTR(self_in);
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led_toggle(self->led_id);
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return mp_const_none;
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}
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/// \method intensity([value])
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/// Get or set the LED intensity. Intensity ranges between 0 (off) and 255 (full on).
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/// If no argument is given, return the LED intensity.
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/// If an argument is given, set the LED intensity and return `None`.
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mp_obj_t led_obj_intensity(size_t n_args, const mp_obj_t *args) {
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pyb_led_obj_t *self = MP_OBJ_TO_PTR(args[0]);
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if (n_args == 1) {
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return mp_obj_new_int(led_get_intensity(self->led_id));
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} else {
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led_set_intensity(self->led_id, mp_obj_get_int(args[1]));
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return mp_const_none;
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}
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}
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static MP_DEFINE_CONST_FUN_OBJ_1(led_obj_on_obj, led_obj_on);
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static MP_DEFINE_CONST_FUN_OBJ_1(led_obj_off_obj, led_obj_off);
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static MP_DEFINE_CONST_FUN_OBJ_1(led_obj_toggle_obj, led_obj_toggle);
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static MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(led_obj_intensity_obj, 1, 2, led_obj_intensity);
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static const mp_rom_map_elem_t led_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR_on), MP_ROM_PTR(&led_obj_on_obj) },
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{ MP_ROM_QSTR(MP_QSTR_off), MP_ROM_PTR(&led_obj_off_obj) },
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{ MP_ROM_QSTR(MP_QSTR_toggle), MP_ROM_PTR(&led_obj_toggle_obj) },
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{ MP_ROM_QSTR(MP_QSTR_intensity), MP_ROM_PTR(&led_obj_intensity_obj) },
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};
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static MP_DEFINE_CONST_DICT(led_locals_dict, led_locals_dict_table);
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MP_DEFINE_CONST_OBJ_TYPE(
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pyb_led_type,
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MP_QSTR_LED,
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MP_TYPE_FLAG_NONE,
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make_new, led_obj_make_new,
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print, led_obj_print,
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locals_dict, &led_locals_dict
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);
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#else
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// For boards with no LEDs, we leave an empty function here so that we don't
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// have to put conditionals everywhere.
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void led_init(void) {
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}
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void led_state(pyb_led_t led, int state) {
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}
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void led_toggle(pyb_led_t led) {
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}
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#endif // defined(MICROPY_HW_LED1)
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