kopia lustrzana https://github.com/espressif/esp-idf
81 wiersze
2.4 KiB
C
81 wiersze
2.4 KiB
C
/* RMT example -- Morse Code
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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 "sdkconfig.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "esp_log.h"
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#include "driver/rmt.h"
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static const char *TAG = "example";
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#define RMT_TX_CHANNEL RMT_CHANNEL_0
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/*
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* Prepare a raw table with a message in the Morse code
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*
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* The message is "ESP" : . ... .--.
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*
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* The table structure represents the RMT item structure:
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* {duration, level, duration, level}
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*
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*/
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static const rmt_item32_t morse_esp[] = {
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// E : dot
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{{{ 32767, 1, 32767, 0 }}}, // dot
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{{{ 32767, 0, 32767, 0 }}}, // SPACE
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// S : dot, dot, dot
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{{{ 32767, 1, 32767, 0 }}}, // dot
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{{{ 32767, 1, 32767, 0 }}}, // dot
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{{{ 32767, 1, 32767, 0 }}}, // dot
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{{{ 32767, 0, 32767, 0 }}}, // SPACE
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// P : dot, dash, dash, dot
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{{{ 32767, 1, 32767, 0 }}}, // dot
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{{{ 32767, 1, 32767, 1 }}},
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{{{ 32767, 1, 32767, 0 }}}, // dash
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{{{ 32767, 1, 32767, 1 }}},
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{{{ 32767, 1, 32767, 0 }}}, // dash
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{{{ 32767, 1, 32767, 0 }}}, // dot
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// RMT end marker
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{{{ 0, 1, 0, 0 }}}
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};
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/*
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* Initialize the RMT Tx channel
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*/
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static void rmt_tx_init(void)
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{
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rmt_config_t config = RMT_DEFAULT_CONFIG_TX(CONFIG_EXAMPLE_RMT_TX_GPIO, RMT_TX_CHANNEL);
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// enable the carrier to be able to hear the Morse sound
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// if the RMT_TX_GPIO is connected to a speaker
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config.tx_config.carrier_en = true;
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config.tx_config.carrier_duty_percent = 50;
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// set audible career frequency of 611 Hz
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// actually 611 Hz is the minimum, that can be set
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// with current implementation of the RMT API
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config.tx_config.carrier_freq_hz = 611;
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// set the maximum clock divider to be able to output
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// RMT pulses in range of about one hundred milliseconds
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config.clk_div = 255;
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ESP_ERROR_CHECK(rmt_config(&config));
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ESP_ERROR_CHECK(rmt_driver_install(config.channel, 0, 0));
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}
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void app_main(void)
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{
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ESP_LOGI(TAG, "Configuring transmitter");
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rmt_tx_init();
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while (1) {
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ESP_ERROR_CHECK(rmt_write_items(RMT_TX_CHANNEL, morse_esp, sizeof(morse_esp) / sizeof(morse_esp[0]), true));
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ESP_LOGI(TAG, "Transmission complete");
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vTaskDelay(1000 / portTICK_PERIOD_MS);
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}
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}
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