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91 lines
2.4 KiB
91 lines
2.4 KiB
3 years ago
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/* Hello World Example
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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#include <stdio.h>
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#include "sdkconfig.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "esp_system.h"
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#include "esp_spi_flash.h"
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#include "driver/ledc.h"
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void app_main(void)
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{
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printf("Hello world!\n");
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/*
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* Prepare and set configuration of timers
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* that will be used by LED Controller
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*/
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ledc_timer_config_t ledc_timer = {
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.duty_resolution = LEDC_TIMER_8_BIT, // resolution of PWM duty
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.freq_hz = 38500, // frequency of PWM signal
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.speed_mode = LEDC_HIGH_SPEED_MODE, // timer mode
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.timer_num = LEDC_TIMER_0, // timer index
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.clk_cfg = LEDC_AUTO_CLK, // Auto select the source clock
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};
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// Set configuration of timer0 for high speed channels
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ledc_timer_config(&ledc_timer);
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ledc_channel_config_t chan = {
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.channel = LEDC_CHANNEL_0,
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.duty = 127,
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.gpio_num = 17,
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.speed_mode = LEDC_HIGH_SPEED_MODE,
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.hpoint = 0,
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.timer_sel = LEDC_TIMER_0
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};
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ledc_channel_config(&chan);
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#define PWM_ON() do { \
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ledc_set_duty(LEDC_HIGH_SPEED_MODE, LEDC_CHANNEL_0, 127); \
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ledc_update_duty(LEDC_HIGH_SPEED_MODE, LEDC_CHANNEL_0); \
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} while(0)
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#define PWM_OFF() do { \
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ledc_stop(LEDC_HIGH_SPEED_MODE, LEDC_CHANNEL_0, 0); \
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} while(0)
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while (1) {
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//const uint8_t bytes[4] = {0b10000000, 0b01111111, 0b00010000, 0b11101111}; // and one 1 at the end
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const uint8_t bytes[4] = {0b10000000 , 0b01111111 , 0b00000000 , 0b11111111}; // and one 1 at the end
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// Preamble
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PWM_ON();
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ets_delay_us(9000);
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PWM_OFF();
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ets_delay_us(4500);
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for (int i = 0; i < 4; i++) {
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uint8_t byte = bytes[i];
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for (int j = 0; j < 8; j++) {
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bool bit = 0 != (byte & 0x80);
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byte <<= 1;
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if (bit==0) {
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PWM_ON();
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ets_delay_us(588);
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PWM_OFF();
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ets_delay_us(540);
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} else {
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PWM_ON();
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ets_delay_us(590);
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PWM_OFF();
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ets_delay_us(1672);
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}
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}
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}
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PWM_ON();
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ets_delay_us(600);
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PWM_OFF();
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ets_delay_us(1700);
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vTaskDelay(pdMS_TO_TICKS(1000));
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}
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}
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