2014-05-03 23:27:38 +01:00
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/*
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* This file is part of the Micro Python 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, 2014 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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2014-03-22 15:52:33 +00:00
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#include <stdio.h>
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2015-01-01 21:06:20 +00:00
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#include "py/runtime.h"
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2017-07-14 07:38:15 +01:00
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#include "py/mphal.h"
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#include "pin.h"
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#include "genhdr/pins.h"
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2014-04-02 15:09:36 +01:00
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#include "timer.h"
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2014-03-22 15:52:33 +00:00
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#include "servo.h"
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2017-07-14 07:38:15 +01:00
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// This file implements the pyb.Servo class which controls standard hobby servo
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// motors that have 3-wires (ground, power, signal).
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//
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// The driver uses hardware PWM to drive servos on pins X1, X2, X3, X4 which are
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// assumed to be on PA0, PA1, PA2, PA3 but not necessarily in that order (the
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// pins PA0-PA3 are used directly if the X pins are not defined).
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//
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// TIM2 and TIM5 have CH1-CH4 on PA0-PA3 respectively. They are both 32-bit
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// counters with 16-bit prescaler. TIM5 is used by this driver.
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2014-03-22 15:52:33 +00:00
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2014-03-22 18:34:16 +00:00
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#define PYB_SERVO_NUM (4)
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typedef struct _pyb_servo_obj_t {
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mp_obj_base_t base;
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2017-07-14 07:38:15 +01:00
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const pin_obj_t *pin;
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2014-04-09 00:45:45 +01:00
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uint8_t pulse_min; // units of 10us
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uint8_t pulse_max; // units of 10us
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uint8_t pulse_centre; // units of 10us
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uint8_t pulse_angle_90; // units of 10us; pulse at 90 degrees, minus pulse_centre
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uint8_t pulse_speed_100; // units of 10us; pulse at 100% forward speed, minus pulse_centre
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uint16_t pulse_cur; // units of 10us
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uint16_t pulse_dest; // units of 10us
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2014-03-22 18:34:16 +00:00
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int16_t pulse_accum;
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2014-04-09 00:45:45 +01:00
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uint16_t time_left;
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2014-03-22 18:34:16 +00:00
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} pyb_servo_obj_t;
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STATIC pyb_servo_obj_t pyb_servo_obj[PYB_SERVO_NUM];
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2014-03-22 15:52:33 +00:00
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void servo_init(void) {
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2014-04-02 15:09:36 +01:00
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timer_tim5_init();
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2014-03-22 18:34:16 +00:00
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// reset servo objects
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for (int i = 0; i < PYB_SERVO_NUM; i++) {
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2014-04-02 19:55:08 +01:00
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pyb_servo_obj[i].base.type = &pyb_servo_type;
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2014-04-09 00:45:45 +01:00
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pyb_servo_obj[i].pulse_min = 64;
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pyb_servo_obj[i].pulse_max = 242;
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pyb_servo_obj[i].pulse_centre = 150;
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pyb_servo_obj[i].pulse_angle_90 = 97;
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pyb_servo_obj[i].pulse_speed_100 = 70;
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pyb_servo_obj[i].pulse_cur = 150;
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2014-03-22 18:34:16 +00:00
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pyb_servo_obj[i].pulse_dest = 0;
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2014-04-09 00:45:45 +01:00
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pyb_servo_obj[i].time_left = 0;
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2014-03-22 18:34:16 +00:00
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}
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2017-07-14 07:38:15 +01:00
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// assign servo objects to specific pins (must be some permutation of PA0-PA3)
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#ifdef pyb_pin_X1
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pyb_servo_obj[0].pin = &pyb_pin_X1;
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pyb_servo_obj[1].pin = &pyb_pin_X2;
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pyb_servo_obj[2].pin = &pyb_pin_X3;
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pyb_servo_obj[3].pin = &pyb_pin_X4;
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#else
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pyb_servo_obj[0].pin = &pin_A0;
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pyb_servo_obj[1].pin = &pin_A1;
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pyb_servo_obj[2].pin = &pin_A2;
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pyb_servo_obj[3].pin = &pin_A3;
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#endif
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2014-03-22 18:34:16 +00:00
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}
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void servo_timer_irq_callback(void) {
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bool need_it = false;
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for (int i = 0; i < PYB_SERVO_NUM; i++) {
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pyb_servo_obj_t *s = &pyb_servo_obj[i];
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if (s->pulse_cur != s->pulse_dest) {
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2014-04-09 00:45:45 +01:00
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// clamp pulse to within min/max
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if (s->pulse_dest < s->pulse_min) {
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s->pulse_dest = s->pulse_min;
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} else if (s->pulse_dest > s->pulse_max) {
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s->pulse_dest = s->pulse_max;
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}
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// adjust cur to get closer to dest
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2014-03-22 18:34:16 +00:00
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if (s->time_left <= 1) {
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s->pulse_cur = s->pulse_dest;
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s->time_left = 0;
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} else {
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s->pulse_accum += s->pulse_dest - s->pulse_cur;
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s->pulse_cur += s->pulse_accum / s->time_left;
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s->pulse_accum %= s->time_left;
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s->time_left--;
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need_it = true;
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}
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2014-04-09 00:45:45 +01:00
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// set the pulse width
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2017-07-14 07:38:15 +01:00
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*(&TIM5->CCR1 + s->pin->pin) = s->pulse_cur;
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2014-03-22 18:34:16 +00:00
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}
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}
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if (need_it) {
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2014-04-02 15:09:36 +01:00
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__HAL_TIM_ENABLE_IT(&TIM5_Handle, TIM_IT_UPDATE);
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2014-03-22 18:34:16 +00:00
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} else {
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2014-04-02 15:09:36 +01:00
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__HAL_TIM_DISABLE_IT(&TIM5_Handle, TIM_IT_UPDATE);
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2014-03-22 18:34:16 +00:00
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}
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2014-03-22 15:52:33 +00:00
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}
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2014-03-22 18:34:16 +00:00
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STATIC void servo_init_channel(pyb_servo_obj_t *s) {
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2017-07-14 07:38:15 +01:00
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static const uint8_t channel_table[4] =
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{TIM_CHANNEL_1, TIM_CHANNEL_2, TIM_CHANNEL_3, TIM_CHANNEL_4};
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uint32_t channel = channel_table[s->pin->pin];
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2014-03-22 15:52:33 +00:00
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// GPIO configuration
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2017-07-14 07:38:15 +01:00
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mp_hal_pin_config(s->pin, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, GPIO_AF2_TIM5);
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2014-03-22 15:52:33 +00:00
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// PWM mode configuration
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TIM_OC_InitTypeDef oc_init;
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oc_init.OCMode = TIM_OCMODE_PWM1;
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2014-03-22 18:34:16 +00:00
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oc_init.Pulse = s->pulse_cur; // units of 10us
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2014-03-22 15:52:33 +00:00
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oc_init.OCPolarity = TIM_OCPOLARITY_HIGH;
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oc_init.OCFastMode = TIM_OCFAST_DISABLE;
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2014-04-02 15:09:36 +01:00
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HAL_TIM_PWM_ConfigChannel(&TIM5_Handle, &oc_init, channel);
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2014-03-22 15:52:33 +00:00
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// start PWM
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2014-04-02 15:09:36 +01:00
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HAL_TIM_PWM_Start(&TIM5_Handle, channel);
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2014-03-22 15:52:33 +00:00
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}
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/******************************************************************************/
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// Micro Python bindings
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STATIC mp_obj_t pyb_servo_set(mp_obj_t port, mp_obj_t value) {
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int p = mp_obj_get_int(port);
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int v = mp_obj_get_int(value);
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if (v < 50) { v = 50; }
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if (v > 250) { v = 250; }
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switch (p) {
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2014-04-02 15:09:36 +01:00
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case 1: TIM5->CCR1 = v; break;
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case 2: TIM5->CCR2 = v; break;
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case 3: TIM5->CCR3 = v; break;
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case 4: TIM5->CCR4 = v; break;
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2014-03-22 15:52:33 +00:00
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}
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_2(pyb_servo_set_obj, pyb_servo_set);
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STATIC mp_obj_t pyb_pwm_set(mp_obj_t period, mp_obj_t pulse) {
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int pe = mp_obj_get_int(period);
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int pu = mp_obj_get_int(pulse);
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2014-04-02 15:09:36 +01:00
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TIM5->ARR = pe;
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TIM5->CCR3 = pu;
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2014-03-22 15:52:33 +00:00
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_2(pyb_pwm_set_obj, pyb_pwm_set);
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2015-04-09 23:56:15 +01:00
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STATIC void pyb_servo_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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2014-03-22 15:52:33 +00:00
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pyb_servo_obj_t *self = self_in;
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2017-07-14 07:38:15 +01:00
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mp_printf(print, "<Servo %lu at %luus>", self - &pyb_servo_obj[0] + 1, 10 * self->pulse_cur);
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2014-03-22 15:52:33 +00:00
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}
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2014-04-29 22:55:34 +01:00
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/// \classmethod \constructor(id)
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/// Create a servo object. `id` is 1-4.
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2017-01-04 13:10:42 +00:00
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STATIC mp_obj_t pyb_servo_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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2014-03-24 11:48:39 +00:00
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// check arguments
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2014-04-20 00:16:30 +01:00
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mp_arg_check_num(n_args, n_kw, 1, 1, false);
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2014-03-24 11:48:39 +00:00
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// get servo number
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2014-07-03 13:25:24 +01:00
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mp_int_t servo_id = mp_obj_get_int(args[0]) - 1;
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2014-03-24 11:48:39 +00:00
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// check servo number
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if (!(0 <= servo_id && servo_id < PYB_SERVO_NUM)) {
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2017-06-15 03:02:14 +01:00
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "Servo(%d) doesn't exist", servo_id + 1));
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2014-03-24 11:48:39 +00:00
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}
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// get and init servo object
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pyb_servo_obj_t *s = &pyb_servo_obj[servo_id];
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s->pulse_dest = s->pulse_cur;
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s->time_left = 0;
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servo_init_channel(s);
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return s;
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}
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2014-04-29 22:55:34 +01:00
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/// \method pulse_width([value])
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/// Get or set the pulse width in milliseconds.
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2014-08-30 00:35:11 +01:00
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STATIC mp_obj_t pyb_servo_pulse_width(mp_uint_t n_args, const mp_obj_t *args) {
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2014-04-09 00:45:45 +01:00
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pyb_servo_obj_t *self = args[0];
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if (n_args == 1) {
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// get pulse width, in us
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return mp_obj_new_int(10 * self->pulse_cur);
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} else {
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// set pulse width, in us
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self->pulse_dest = mp_obj_get_int(args[1]) / 10;
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self->time_left = 0;
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servo_timer_irq_callback();
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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_VAR_BETWEEN(pyb_servo_pulse_width_obj, 1, 2, pyb_servo_pulse_width);
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2014-04-29 22:55:34 +01:00
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/// \method calibration([pulse_min, pulse_max, pulse_centre, [pulse_angle_90, pulse_speed_100]])
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/// Get or set the calibration of the servo timing.
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2014-05-03 16:42:27 +01:00
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// TODO should accept 1 arg, a 5-tuple of values to set
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2014-08-30 00:35:11 +01:00
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STATIC mp_obj_t pyb_servo_calibration(mp_uint_t n_args, const mp_obj_t *args) {
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2014-04-09 00:45:45 +01:00
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pyb_servo_obj_t *self = args[0];
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if (n_args == 1) {
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// get calibration values
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mp_obj_t tuple[5];
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tuple[0] = mp_obj_new_int(10 * self->pulse_min);
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tuple[1] = mp_obj_new_int(10 * self->pulse_max);
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tuple[2] = mp_obj_new_int(10 * self->pulse_centre);
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tuple[3] = mp_obj_new_int(10 * (self->pulse_angle_90 + self->pulse_centre));
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tuple[4] = mp_obj_new_int(10 * (self->pulse_speed_100 + self->pulse_centre));
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return mp_obj_new_tuple(5, tuple);
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} else if (n_args >= 4) {
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// set min, max, centre
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self->pulse_min = mp_obj_get_int(args[1]) / 10;
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self->pulse_max = mp_obj_get_int(args[2]) / 10;
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self->pulse_centre = mp_obj_get_int(args[3]) / 10;
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if (n_args == 4) {
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return mp_const_none;
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} else if (n_args == 6) {
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self->pulse_angle_90 = mp_obj_get_int(args[4]) / 10 - self->pulse_centre;
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self->pulse_speed_100 = mp_obj_get_int(args[5]) / 10 - self->pulse_centre;
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return mp_const_none;
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}
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}
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// bad number of arguments
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2014-04-21 18:21:07 +01:00
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError, "calibration expecting 1, 4 or 6 arguments, got %d", n_args));
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2014-04-09 00:45:45 +01:00
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}
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2014-04-21 18:21:07 +01:00
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_servo_calibration_obj, 1, 6, pyb_servo_calibration);
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2014-04-09 00:45:45 +01:00
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2014-04-29 22:55:34 +01:00
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/// \method angle([angle, time=0])
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/// Get or set the angle of the servo.
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///
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/// - `angle` is the angle to move to in degrees.
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/// - `time` is the number of milliseconds to take to get to the specified angle.
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2014-08-30 00:35:11 +01:00
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STATIC mp_obj_t pyb_servo_angle(mp_uint_t n_args, const mp_obj_t *args) {
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2014-03-22 18:34:16 +00:00
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pyb_servo_obj_t *self = args[0];
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if (n_args == 1) {
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// get angle
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2014-04-09 00:45:45 +01:00
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return mp_obj_new_int((self->pulse_cur - self->pulse_centre) * 90 / self->pulse_angle_90);
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2014-03-22 18:34:16 +00:00
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} else {
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2014-06-01 13:32:54 +01:00
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#if MICROPY_PY_BUILTINS_FLOAT
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2014-04-09 00:45:45 +01:00
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self->pulse_dest = self->pulse_centre + self->pulse_angle_90 * mp_obj_get_float(args[1]) / 90.0;
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2014-03-22 15:52:33 +00:00
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#else
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2014-04-09 00:45:45 +01:00
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self->pulse_dest = self->pulse_centre + self->pulse_angle_90 * mp_obj_get_int(args[1]) / 90;
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2014-03-22 15:52:33 +00:00
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#endif
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2014-03-22 18:34:16 +00:00
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if (n_args == 2) {
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// set angle immediately
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self->time_left = 0;
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} else {
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// set angle over a given time (given in milli seconds)
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self->time_left = mp_obj_get_int(args[2]) / 20;
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self->pulse_accum = 0;
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}
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servo_timer_irq_callback();
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return mp_const_none;
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2014-03-22 15:52:33 +00:00
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|
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}
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}
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2014-03-24 11:48:39 +00:00
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_servo_angle_obj, 1, 3, pyb_servo_angle);
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2014-03-22 15:52:33 +00:00
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|
|
2014-04-29 22:55:34 +01:00
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/// \method speed([speed, time=0])
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|
|
|
/// Get or set the speed of a continuous rotation servo.
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|
|
|
///
|
|
|
|
/// - `speed` is the speed to move to change to, between -100 and 100.
|
|
|
|
/// - `time` is the number of milliseconds to take to get to the specified speed.
|
2014-08-30 00:35:11 +01:00
|
|
|
STATIC mp_obj_t pyb_servo_speed(mp_uint_t n_args, const mp_obj_t *args) {
|
2014-04-09 00:45:45 +01:00
|
|
|
pyb_servo_obj_t *self = args[0];
|
|
|
|
if (n_args == 1) {
|
|
|
|
// get speed
|
|
|
|
return mp_obj_new_int((self->pulse_cur - self->pulse_centre) * 100 / self->pulse_speed_100);
|
|
|
|
} else {
|
2014-06-01 13:32:54 +01:00
|
|
|
#if MICROPY_PY_BUILTINS_FLOAT
|
2014-04-09 00:45:45 +01:00
|
|
|
self->pulse_dest = self->pulse_centre + self->pulse_speed_100 * mp_obj_get_float(args[1]) / 100.0;
|
|
|
|
#else
|
|
|
|
self->pulse_dest = self->pulse_centre + self->pulse_speed_100 * mp_obj_get_int(args[1]) / 100;
|
|
|
|
#endif
|
|
|
|
if (n_args == 2) {
|
|
|
|
// set speed immediately
|
|
|
|
self->time_left = 0;
|
|
|
|
} else {
|
|
|
|
// set speed over a given time (given in milli seconds)
|
|
|
|
self->time_left = mp_obj_get_int(args[2]) / 20;
|
|
|
|
self->pulse_accum = 0;
|
|
|
|
}
|
|
|
|
servo_timer_irq_callback();
|
|
|
|
return mp_const_none;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_servo_speed_obj, 1, 3, pyb_servo_speed);
|
|
|
|
|
2017-05-06 08:03:40 +01:00
|
|
|
STATIC const mp_rom_map_elem_t pyb_servo_locals_dict_table[] = {
|
|
|
|
{ MP_ROM_QSTR(MP_QSTR_pulse_width), MP_ROM_PTR(&pyb_servo_pulse_width_obj) },
|
|
|
|
{ MP_ROM_QSTR(MP_QSTR_calibration), MP_ROM_PTR(&pyb_servo_calibration_obj) },
|
|
|
|
{ MP_ROM_QSTR(MP_QSTR_angle), MP_ROM_PTR(&pyb_servo_angle_obj) },
|
|
|
|
{ MP_ROM_QSTR(MP_QSTR_speed), MP_ROM_PTR(&pyb_servo_speed_obj) },
|
2014-03-22 15:52:33 +00:00
|
|
|
};
|
|
|
|
|
2014-03-26 21:47:19 +00:00
|
|
|
STATIC MP_DEFINE_CONST_DICT(pyb_servo_locals_dict, pyb_servo_locals_dict_table);
|
|
|
|
|
2014-03-24 11:48:39 +00:00
|
|
|
const mp_obj_type_t pyb_servo_type = {
|
2014-03-22 15:52:33 +00:00
|
|
|
{ &mp_type_type },
|
|
|
|
.name = MP_QSTR_Servo,
|
2014-03-24 11:48:39 +00:00
|
|
|
.print = pyb_servo_print,
|
|
|
|
.make_new = pyb_servo_make_new,
|
2017-05-06 08:03:40 +01:00
|
|
|
.locals_dict = (mp_obj_dict_t*)&pyb_servo_locals_dict,
|
2014-03-22 15:52:33 +00:00
|
|
|
};
|