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86 lines
2.4 KiB
86 lines
2.4 KiB
4 months ago
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/*
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ESP-IDF Sniffer
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This example demonstrates how to use the DMX sniffer to read packet
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metadata from incoming DMX data packets. Data is read synchronously from the
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DMX bus. If there are no errors in the packet a log is written every 1 second
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that contains information about the received DMX data packet. When the data
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times out, the driver is uninstalled and the program terminates.
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Note: this example is for use with the ESP-IDF. It will not work on Arduino!
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Created 28 January 2021
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By Mitch Weisbrod
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https://github.com/someweisguy/esp_dmx
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*/
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#include "esp_dmx.h"
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#include "esp_log.h"
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#include "esp_system.h"
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#include "freertos/task.h"
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#include "dmx/sniffer.h"
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#include "driver/gpio.h"
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#define TX_PIN 48 // The DMX transmit pin.
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#define RX_PIN 47 // The DMX receive pin.
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#define EN_PIN 35 // The DMX transmit enable pin.
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#define SN_PIN 45 // The DMX sniffer pin.
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static const char *TAG = "dmx_sniffer"; // The log tagline.
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void task_idf_sniffer(void *arg)
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{
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ESP_LOGI(TAG, "task_idf_sniffer start");
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const dmx_port_t dmx_num = DMX_NUM_1;
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// Set communication pins and install the driver
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dmx_config_t config = DMX_CONFIG_DEFAULT;
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dmx_driver_install(dmx_num, &config, DMX_INTR_FLAGS_DEFAULT);
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dmx_set_pin(dmx_num, TX_PIN, RX_PIN, EN_PIN);
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// Install the default GPIO ISR and enable the sniffer
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ESP_ERROR_CHECK(gpio_install_isr_service(DMX_SNIFFER_INTR_FLAGS_DEFAULT));
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dmx_sniffer_enable(dmx_num, SN_PIN);
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dmx_metadata_t metadata;
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bool is_connected = false;
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TickType_t last_update = xTaskGetTickCount();
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while (true)
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{
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// Block until a packet is received
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if (dmx_sniffer_get_data(dmx_num, &metadata, DMX_TIMEOUT_TICK))
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{
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const TickType_t now = xTaskGetTickCount();
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if (!is_connected)
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{
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// Log when we first connect
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ESP_LOGI(TAG, "DMX is connected.");
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is_connected = true;
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}
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if (now - last_update >= pdMS_TO_TICKS(1000))
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{
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// Only log data every 1000ms
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ESP_LOGI(TAG, "Break: %li, MAB: %li", metadata.break_len,
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metadata.mab_len);
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last_update = now;
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}
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}
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else if (is_connected)
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{
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// DMX timed out after having been previously connected
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ESP_LOGI(TAG, "DMX was disconnected.");
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dmx_sniffer_disable(dmx_num);
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break;
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}
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}
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ESP_LOGI(TAG, "Uninstalling the DMX driver.");
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dmx_driver_delete(dmx_num);
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ESP_LOGI(TAG, "task_idf_sniffer end");
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}
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