changed wifi channel switching to hw interrupt
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34
src/main.cpp
34
src/main.cpp
@ -52,13 +52,15 @@ uint16_t LEDBlinkDuration = 0; // How long the blink need to be
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uint16_t LEDColor = COLOR_NONE; // state machine variable to set RGB LED color
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bool joinstate = false; // LoRa network joined? global flag
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bool blinkdone = true; // flag for state machine for blinking LED once
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hw_timer_t * timer = NULL; // configure hardware timer used for cyclic display refresh
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hw_timer_t * displaytimer = NULL; // configure hardware timer used for cyclic display refresh
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hw_timer_t * channelSwitch = NULL; // configure hardware timer used for wifi channel switching
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portMUX_TYPE timerMux = portMUX_INITIALIZER_UNLOCKED; // sync main loop and ISR when modifying shared variable DisplayIRQ
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std::set<uint16_t> macs; // associative container holds total of unique MAC adress hashes (Wifi + BLE)
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// this variables will be changed in the ISR, and read in main loop
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static volatile int ButtonPressed = 0, DisplayTimerIRQ = 0;
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static volatile int ButtonPressed = 0, DisplayTimerIRQ = 0, ChannelTimerIRQ = 0;
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// local Tag for logging
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static const char *TAG = "paxcnt";
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@ -207,6 +209,10 @@ void lorawan_loop(void * pvParameters) {
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}
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#endif
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void IRAM_ATTR ChannelSwitchIRQ() {
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ChannelTimerIRQ++;
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}
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/* end hardware specific parts -------------------------------------------------------- */
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@ -219,12 +225,14 @@ void sniffer_loop(void * pvParameters) {
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while (1) {
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for (channel = 1; channel <= WIFI_CHANNEL_MAX; channel++) {
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// rotates variable channel 1..WIFI_CHANNEL_MAX
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if (ChannelTimerIRQ) {
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portENTER_CRITICAL(&timerMux);
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ChannelTimerIRQ--;
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portEXIT_CRITICAL(&timerMux);
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// rotates variable channel 1..WIFI_CHANNEL_MAX
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channel = (channel % WIFI_CHANNEL_MAX) + 1;
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wifi_sniffer_set_channel(channel);
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ESP_LOGD(TAG, "Wifi set channel %d", channel);
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vTaskDelay(cfg.wifichancycle*10 / portTICK_PERIOD_MS);
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yield();
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}
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} // end of infinite wifi channel rotation loop
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@ -539,12 +547,18 @@ void setup() {
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sprintf(display_lora, "Join wait");
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// setup Display IRQ, thanks to https://techtutorialsx.com/2017/10/07/esp32-arduino-timer-interrupts/
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timer = timerBegin(0, 80, true); // prescaler 80 -> divides 80 MHz CPU freq to 1 MHz, timer 0, count up
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timerAttachInterrupt(timer, &DisplayIRQ, true); // interrupt handler DisplayIRQ, triggered by edge
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timerAlarmWrite(timer, DISPLAYREFRESH_MS * 1000, true); // reload interrupt after each trigger of display refresh cycle
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timerAlarmEnable(timer); // enable display interrupt
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displaytimer = timerBegin(0, 80, true); // prescaler 80 -> divides 80 MHz CPU freq to 1 MHz, timer 0, count up
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timerAttachInterrupt(displaytimer, &DisplayIRQ, true); // interrupt handler DisplayIRQ, triggered by edge
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timerAlarmWrite(displaytimer, DISPLAYREFRESH_MS * 1000, true); // reload interrupt after each trigger of display refresh cycle
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timerAlarmEnable(displaytimer); // enable display interrupt
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#endif
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// setup channel rotation IRQ, thanks to https://techtutorialsx.com/2017/10/07/esp32-arduino-timer-interrupts/
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channelSwitch = timerBegin(1, 80, true); // prescaler 80 -> divides 80 MHz CPU freq to 1 MHz, timer 1, count up
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timerAttachInterrupt(channelSwitch, &ChannelSwitchIRQ, true); // interrupt handler, triggered by edge
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timerAlarmWrite(channelSwitch, WIFI_CHANNEL_SWITCH_INTERVAL * 10000, true); // reload interrupt after each trigger of channel switch cycle
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timerAlarmEnable(channelSwitch); // enable channel switching interrupt
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// show compiled features
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ESP_LOGI(TAG, "Features %s", features);
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