mirror of https://github.com/rusefi/bldc.git
132 lines
2.6 KiB
C
132 lines
2.6 KiB
C
/*
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Copyright 2016 - 2020 Benjamin Vedder benjamin@vedder.se
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This file is part of the VESC firmware.
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The VESC firmware is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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The VESC firmware is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "ledpwm.h"
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#include "ch.h"
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#include "hal.h"
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#include <string.h>
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#include <math.h>
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// Private variables
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static volatile int led_values[LEDPWM_LED_NUM];
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static uint8_t gamma_table[LEDPWM_CNT_TOP + 1];
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void ledpwm_init(void) {
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memset((int*)led_values, 0, sizeof(led_values));
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// Generate gamma correction table
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for (int i = 0;i < (LEDPWM_CNT_TOP + 1);i++) {
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gamma_table[i] = (int)roundf(powf((float)i / (float)LEDPWM_CNT_TOP, 1.0 / 0.45) * (float)LEDPWM_CNT_TOP);
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}
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}
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/*
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* Set the intensity for one led. The intensity value is mapped to a PWM value
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* according to human luminance perception.
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*
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* Intensity range is 0.0 to 1.0
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*/
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void ledpwm_set_intensity(unsigned int led, float intensity) {
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if (led >= LEDPWM_LED_NUM) {
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return;
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}
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if (intensity < 0.0) {
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intensity = 0.0;
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}
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if (intensity > 1.0) {
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intensity = 1.0;
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}
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led_values[led] = gamma_table[(int)(intensity * LEDPWM_CNT_TOP)];
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}
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void ledpwm_led_on(int led) {
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if (led >= LEDPWM_LED_NUM) {
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return;
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}
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led_values[led] = LEDPWM_CNT_TOP;
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}
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void ledpwm_led_off(int led) {
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if (led >= LEDPWM_LED_NUM) {
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return;
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}
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led_values[led] = 0;
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}
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/*
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* Call this function as fast as possible, with a deterministic rate.
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*/
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void ledpwm_update_pwm(void) {
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static int cnt = 0;
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cnt++;
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if (cnt == LEDPWM_CNT_TOP) {
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cnt = 0;
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}
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if (cnt >= led_values[LED_GREEN]) {
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LED_GREEN_OFF();
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} else {
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LED_GREEN_ON();
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}
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if (cnt >= led_values[LED_RED]) {
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LED_RED_OFF();
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} else {
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LED_RED_ON();
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}
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#ifdef LED_PWM1_ON
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if (cnt >= led_values[LED_HW1]) {
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LED_PWM1_OFF();
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} else {
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LED_PWM1_ON();
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}
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#endif
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#ifdef LED_PWM2_ON
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if (cnt >= led_values[LED_HW2]) {
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LED_PWM2_OFF();
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} else {
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LED_PWM2_ON();
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}
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#endif
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#ifdef LED_PWM3_ON
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if (cnt >= led_values[LED_HW3]) {
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LED_PWM3_OFF();
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} else {
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LED_PWM3_ON();
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}
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#endif
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#ifdef LED_PWM4_ON
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if (cnt >= led_values[LED_HW4]) {
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LED_PWM4_OFF();
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} else {
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LED_PWM4_ON();
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}
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#endif
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}
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