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feat(ledc): Improve timer management with frequency/resolution matching #11452

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Merged
merged 4 commits into from
Jun 10, 2025
Merged

feat(ledc): Improve timer management with frequency/resolution matching #11452

merged 4 commits into from
Jun 10, 2025

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@P-R-O-C-H-Y P-R-O-C-H-Y commented Jun 9, 2025 •
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Description of Change

This pull request introduces enhancements to the LEDC (LED Controller) functionality by adding helper functions for timer management, improving channel attachment logic, and extending the ledc_channel_handle_t structure. The changes aim to streamline timer allocation and deconfiguration, improve frequency and resolution matching, and provide better resource management.

Tests scenarios

Tested using customized ledc example on C6 -> 4 LEDC Timers and checked on oscilloscope.

int brightness = 0;  // how bright the LED is
int fadeAmount = 5;  // how many points to fade the LED by

void setup() {
  // 2 pins same channel - same timer
  ledcAttachChannel(4, 5000, 8, 0);
  ledcAttachChannel(5, 5000, 8, 0);
  // 3 pins with new timer
  ledcAttach(0, 10000, 10);
  ledcAttach(1, 50000, 8);
  ledcAttach(2, 5000, 10);
  // reused timer that uses pin 0
  ledcAttach(3, 10000, 10);
  // no more free timers
  ledcAttach(6, 8000, 8);
  // detach pin and deconfigure unused timer
  ledcDetach(1);
  // use the new free timer
  ledcAttach(6, 8000, 8);
}

void loop() {
  // set the brightness on LEDC channel 0
  ledcWrite(0, brightness);
  ledcWrite(2, brightness);
  ledcWrite(3, brightness);
  ledcWrite(4, brightness);
  ledcWrite(5, brightness);
  ledcWrite(6, brightness);

  // change the brightness for next time through the loop:
  brightness = brightness + fadeAmount;

  // reverse the direction of the fading at the ends of the fade:
  if (brightness <= 0 || brightness >= 255) {
    fadeAmount = -fadeAmount;
  }
  // wait for 30 milliseconds to see the dimming effect
  delay(30);
}

Related links

Closes #11373

@P-R-O-C-H-Y P-R-O-C-H-Y self-assigned this Jun 9, 2025
@P-R-O-C-H-Y P-R-O-C-H-Y requested a review from a team as a code owner June 9, 2025 10:07
@P-R-O-C-H-Y P-R-O-C-H-Y added Area: Peripherals API Relates to peripheral's APIs. Status: Review needed Issue or PR is awaiting review labels Jun 9, 2025
@P-R-O-C-H-Y P-R-O-C-H-Y moved this from Todo to In Review in Arduino ESP32 Core Project Roadmap Jun 9, 2025
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Warnings
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Test Results

 76 files   76 suites   12m 46s ⏱️
 38 tests  38 ✅ 0 💤 0 ❌
241 runs  241 ✅ 0 💤 0 ❌

Results for commit d68a146.

♻️ This comment has been updated with latest results.

lucasssvaz
lucasssvaz approved these changes Jun 9, 2025
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LGTM, just a small optimization

@P-R-O-C-H-Y @lucasssvaz
Update cores/esp32/esp32-hal-ledc.c
b37a764 
Co-authored-by: Lucas Saavedra Vaz <32426024+lucasssvaz@users.noreply.github.com>
@me-no-dev me-no-dev added Status: Pending Merge Pull Request is ready to be merged and removed Status: Review needed Issue or PR is awaiting review labels Jun 10, 2025
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Memory usage test (comparing PR against master branch)

The table below shows the summary of memory usage change (decrease - increase) in bytes and percentage for each target.

MemoryFLASH [bytes]FLASH [%]RAM [bytes]RAM [%]
TargetDECINCDECINCDECINCDECINC
ESP32P40⚠️ +6040.00⚠️ +0.19000.000.00
ESP32S3💚 -16⚠️ +5360.00⚠️ +0.17000.000.00
ESP32S20⚠️ +5240.00⚠️ +0.20000.000.00
ESP32C30⚠️ +5580.00⚠️ +0.20000.000.00
ESP32C60⚠️ +5660.00⚠️ +0.24000.000.00
ESP32H20⚠️ +5660.00⚠️ +0.20000.000.00
ESP320⚠️ +5320.00⚠️ +0.17000.000.00
Click to expand the detailed deltas report [usage change in BYTES]
TargetESP32P4ESP32S3ESP32S2ESP32C3ESP32C6ESP32H2ESP32
ExampleFLASHRAMFLASHRAMFLASHRAMFLASHRAMFLASHRAMFLASHRAMFLASHRAM
ArduinoOTA/examples/BasicOTA0000000000--00
AsyncUDP/examples/AsyncUDPClient0000000000--00
AsyncUDP/examples/AsyncUDPMulticastServer0000000000--00
AsyncUDP/examples/AsyncUDPServer0000000000--00
DNSServer/examples/CaptivePortal0000000000--00
EEPROM/examples/eeprom_class00000000000000
EEPROM/examples/eeprom_extra00000000000000
EEPROM/examples/eeprom_write00000000000000
ESP32/examples/AnalogOut/LEDCFade⚠️ +5940⚠️ +5120⚠️ +5080⚠️ +5560⚠️ +5600⚠️ +5540⚠️ +5000
ESP32/examples/AnalogOut/LEDCSingleChannel⚠️ +5980⚠️ +5120⚠️ +5080⚠️ +5560⚠️ +5580⚠️ +5620⚠️ +5000
ESP32/examples/AnalogOut/LEDCSoftwareFade⚠️ +6000⚠️ +5120⚠️ +5120⚠️ +5580⚠️ +5620⚠️ +5640⚠️ +5000
ESP32/examples/AnalogOut/SigmaDelta00000000000000
ESP32/examples/AnalogOut/ledcFrequency⚠️ +6040⚠️ +5120⚠️ +5000⚠️ +5580⚠️ +5660⚠️ +5600⚠️ +5000
ESP32/examples/AnalogOut/ledcWrite_RGB⚠️ +5940⚠️ +5120⚠️ +5000⚠️ +5560⚠️ +5620⚠️ +5660⚠️ +5000
ESP32/examples/AnalogRead00000000000000
ESP32/examples/AnalogReadContinuous00000000000000
ESP32/examples/ArduinoStackSize00000000000000
ESP32/examples/CI/CIBoardsTest00000000000000
ESP32/examples/ChipID/GetChipID00000000000000
ESP32/examples/DeepSleep/TimerWakeUp0000000000--00
ESP32/examples/DeepSleep/TouchWakeUp000000------00
ESP32/examples/FreeRTOS/BasicMultiThreading00000000000000
ESP32/examples/FreeRTOS/Mutex00000000000000
ESP32/examples/FreeRTOS/Queue00000000000000
ESP32/examples/FreeRTOS/Semaphore00000000000000
ESP32/examples/GPIO/BlinkRGB00000000000000
ESP32/examples/GPIO/FunctionalInterrupt00000000000000
ESP32/examples/GPIO/FunctionalInterruptStruct00000000000000
ESP32/examples/GPIO/GPIOInterrupt00000000000000
ESP32/examples/HWCDC_Events0000--000000--
ESP32/examples/MacAddress/GetMacAddress00000000000000
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ESP32/examples/RMT/RMTCallback00000000000000
ESP32/examples/RMT/RMTLoopback00000000000000
ESP32/examples/RMT/RMTReadXJT00000000000000
ESP32/examples/RMT/RMTWrite_RGB_LED00000000000000
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ESP32/examples/RMT/RMT_LED_Blink00000000000000
ESP32/examples/ResetReason/ResetReason00000000000000
ESP32/examples/ResetReason/ResetReason200000000000000
ESP32/examples/Serial/BaudRateDetect_Demo00000000000000
ESP32/examples/Serial/OnReceiveError_BREAK_Demo00000000000000
ESP32/examples/Serial/OnReceive_Demo00000000000000
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ESP32/examples/TWAI/TWAIreceive00000000000000
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ESP32/examples/Timer/WatchdogTimer00000000000000
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ESP32/examples/Utilities/HEXBuilder00000000000000
ESP32/examples/Utilities/MD5Builder00000000000000
ESP32/examples/Utilities/SHA1Builder00000000000000
ESP_I2S/examples/ES8388_loopback00000000000000
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ESP_I2S/examples/Simple_tone00000000000000
ESPmDNS/examples/mDNS-SD_Extended0000000000--00
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Ethernet/examples/ETH_TLK11000----------00
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HTTPUpdate/examples/httpUpdateSPIFFS0000000000--00
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HTTPUpdateServer/examples/WebUpdater0000000000--00
LittleFS/examples/LITTLEFS_test00000000000000
LittleFS/examples/LITTLEFS_time0000000000--00
NetBIOS/examples/ESP_NBNST0000000000--00
NetworkClientSecure/examples/WiFiClientInsecure0000000000--00
NetworkClientSecure/examples/WiFiClientPSK0000000000--00
NetworkClientSecure/examples/WiFiClientSecure0000000000--00
NetworkClientSecure/examples/WiFiClientSecureProtocolUpgrade0000000000--00
NetworkClientSecure/examples/WiFiClientShowPeerCredentials0000000000--00
NetworkClientSecure/examples/WiFiClientTrustOnFirstUse0000000000--00
PPP/examples/PPP_Basic00000000000000
PPP/examples/PPP_WIFI_BRIDGE0000000000--00
Preferences/examples/Prefs2Struct00000000000000
Preferences/examples/StartCounter00000000000000
SD/examples/SD_Test00000000000000
SD/examples/SD_time0000000000--00
SD_MMC/examples/SD2USBMSC0000----------
SD_MMC/examples/SDMMC_Test0000--------00
SD_MMC/examples/SDMMC_time0000--------00
SPI/examples/SPI_Multiple_Buses00000000000000
SPIFFS/examples/SPIFFS_Test00000000000000
SPIFFS/examples/SPIFFS_time0000000000--00
TFLiteMicro/examples/hello_world00000000000000
Ticker/examples/Blinker00000000000000
Ticker/examples/TickerBasic00000000000000
Ticker/examples/TickerParameter00000000000000
USB/examples/CompositeDevice000000--------
USB/examples/ConsumerControl000000--------
USB/examples/CustomHIDDevice000000--------
USB/examples/FirmwareMSC000000--------
USB/examples/Gamepad000000--------
USB/examples/HIDVendor000000--------
USB/examples/Keyboard/KeyboardLogout000000--------
USB/examples/Keyboard/KeyboardMessage000000--------
USB/examples/Keyboard/KeyboardReprogram000000--------
USB/examples/Keyboard/KeyboardSerial000000--------
USB/examples/KeyboardAndMouseControl000000--------
USB/examples/MIDI/MidiController000000--------
USB/examples/MIDI/MidiInterface000000--------
USB/examples/MIDI/MidiMusicBox000000--------
USB/examples/MIDI/ReceiveMidi000000--------
USB/examples/Mouse/ButtonMouseControl000000--------
USB/examples/SystemControl000000--------
USB/examples/USBMSC000000--------
USB/examples/USBSerial000000--------
USB/examples/USBVendor000000--------
Update/examples/AWS_S3_OTA_Update0000000000--00
Update/examples/HTTPS_OTA_Update0000000000--00
Update/examples/HTTP_Client_AES_OTA_Update0000000000--00
Update/examples/HTTP_Server_AES_OTA_Update0000000000--00
Update/examples/OTAWebUpdater0000000000--00
Update/examples/SD_Update00000000000000
WebServer/examples/AdvancedWebServer0000000000--00
WebServer/examples/FSBrowser0000000000--00
WebServer/examples/Filters0000000000--00
WebServer/examples/HelloServer0000000000--00
WebServer/examples/HttpAdvancedAuth0000000000--00
WebServer/examples/HttpAuthCallback0000000000--00
WebServer/examples/HttpAuthCallbackInline00⚠️ +160000000--00
WebServer/examples/HttpBasicAuth0000000000--00
WebServer/examples/HttpBasicAuthSHA10000000000--00
WebServer/examples/HttpBasicAuthSHA1orBearerToken0000000000--00
WebServer/examples/MultiHomedServers0000000000--00
WebServer/examples/PathArgServer0000000000--00
WebServer/examples/SDWebServer0000000000--00
WebServer/examples/SimpleAuthentification0000000000--00
WebServer/examples/UploadHugeFile0000000000--00
WebServer/examples/WebServer0000000000--00
WebServer/examples/WebUpdate0000000000--00
WiFi/examples/FTM/FTM_Initiator0000000000--00
WiFi/examples/FTM/FTM_Responder0000000000--00
WiFi/examples/SimpleWiFiServer0000000000--00
WiFi/examples/WiFiAccessPoint0000000000--00
WiFi/examples/WiFiClient0000000000--00
WiFi/examples/WiFiClientBasic0000000000--00
WiFi/examples/WiFiClientConnect0000000000--00
WiFi/examples/WiFiClientEvents0000000000--00
WiFi/examples/WiFiClientStaticIP0000000000--00
WiFi/examples/WiFiExtender0000000000--00
WiFi/examples/WiFiIPv60000000000--00
WiFi/examples/WiFiMulti0000000000--00
WiFi/examples/WiFiMultiAdvanced0000000000--00
WiFi/examples/WiFiScan0000000000--00
WiFi/examples/WiFiScanAsync0000000000--00
WiFi/examples/WiFiScanDualAntenna0000000000--00
WiFi/examples/WiFiScanTime0000000000--00
WiFi/examples/WiFiTelnetToSerial0000000000--00
WiFi/examples/WiFiUDPClient0000000000--00
Wire/examples/WireMaster00000000000000
Wire/examples/WireScan00000000000000
Wire/examples/WireSlave00000000000000
BLE/examples/BLE5_extended_scan--00--000000--
BLE/examples/BLE5_multi_advertising--00--000000--
BLE/examples/BLE5_periodic_advertising--00--000000--
BLE/examples/BLE5_periodic_sync--00--000000--
BLE/examples/Beacon_Scanner--00--00000000
BLE/examples/Client--00--00000000
BLE/examples/EddystoneTLM_Beacon--00--00000000
BLE/examples/EddystoneURL_Beacon--00--00000000
BLE/examples/Notify--00--00000000
BLE/examples/Scan--00--00000000
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BLE/examples/Server_multiconnect--00--00000000
BLE/examples/UART--00--00000000
BLE/examples/Write--00--00000000
BLE/examples/iBeacon--00--00000000
ESP32/examples/Camera/CameraWebServer (1)--⚠️ +5000⚠️ +5120------⚠️ +5080
ESP32/examples/Camera/CameraWebServer (2)--⚠️ +5360⚠️ +4480------⚠️ +5120
ESP32/examples/Camera/CameraWebServer (3)--⚠️ +5320----------
ESP32/examples/DeepSleep/ExternalWakeUp--0000------00
ESP_NOW/examples/ESP_NOW_Broadcast_Master--00000000--00
ESP_NOW/examples/ESP_NOW_Broadcast_Slave--00000000--00
ESP_NOW/examples/ESP_NOW_Network--00000000--00
ESP_NOW/examples/ESP_NOW_Serial--00000000--00
ESP_SR/examples/Basic--00----------
HTTPClient/examples/HTTPClientEnterprise--00000000--00
Insights/examples/DiagnosticsSmokeTest--00000000--00
Insights/examples/MinimalDiagnostics--00000000--00
Matter/examples/MatterColorLight--00000000--⚠️ +5160
Matter/examples/MatterCommissionTest--00000000--00
Matter/examples/MatterComposedLights--00000000--00
Matter/examples/MatterContactSensor--00000000--00
Matter/examples/MatterDimmableLight--00000000--⚠️ +5160
Matter/examples/MatterEnhancedColorLight--00000000--⚠️ +5320
Matter/examples/MatterFan--00000000--⚠️ +4760
Matter/examples/MatterHumiditySensor--00000000--00
Matter/examples/MatterMinimum--00000000--00
Matter/examples/MatterOccupancySensor--00000000--00
Matter/examples/MatterOnIdentify--00000000--00
Matter/examples/MatterOnOffLight--00000000--00
Matter/examples/MatterOnOffPlugin--00000000--00
Matter/examples/MatterPressureSensor--00000000--00
Matter/examples/MatterSmartButon--00000000--00
Matter/examples/MatterTemperatureLight--00000000--⚠️ +5240
Matter/examples/MatterTemperatureSensor--00000000--00
Matter/examples/MatterThermostat--00000000--00
Matter/examples/WiFiProvWithinMatter--00000000--00
NetworkClientSecure/examples/WiFiClientSecureEnterprise--00000000--00
RainMaker/examples/RMakerCustom--00000000----
RainMaker/examples/RMakerCustomAirCooler--⚠️ +5120⚠️ +5240⚠️ +5560⚠️ +5560----
RainMaker/examples/RMakerSonoffDualR3--00000000----
RainMaker/examples/RMakerSwitch--00000000----
SimpleBLE/examples/SimpleBleDevice--00--00000000
WebServer/examples/Middleware--💚 -160000000--00
WiFi/examples/WPS--00000000--00
WiFi/examples/WiFiBlueToothSwitch--00--0000--00
WiFi/examples/WiFiClientEnterprise--00000000--00
WiFi/examples/WiFiSmartConfig--00000000--00
WiFiProv/examples/WiFiProv--00000000--00
Zigbee/examples/Zigbee_Analog_Input_Output--000000000000
Zigbee/examples/Zigbee_Color_Dimmer_Switch--000000000000
Zigbee/examples/Zigbee_Electrical_AC_Sensor--000000000000
Zigbee/examples/Zigbee_Electrical_AC_Sensor_MultiPhase--000000000000
Zigbee/examples/Zigbee_Gateway--000000----00
Zigbee/examples/Zigbee_On_Off_Switch--000000000000
Zigbee/examples/Zigbee_Range_Extender--000000000000
Zigbee/examples/Zigbee_Thermostat--000000000000
OpenThread/examples/COAP/coap_lamp--------0000--
OpenThread/examples/COAP/coap_switch--------0000--
OpenThread/examples/SimpleCLI--------0000--
OpenThread/examples/SimpleNode--------0000--
OpenThread/examples/SimpleThreadNetwork/ExtendedRouterNode--------0000--
OpenThread/examples/SimpleThreadNetwork/LeaderNode--------0000--
OpenThread/examples/SimpleThreadNetwork/RouterNode--------0000--
OpenThread/examples/ThreadScan--------0000--
OpenThread/examples/onReceive--------0000--
Zigbee/examples/Zigbee_Binary_Input--------0000--
Zigbee/examples/Zigbee_CarbonDioxide_Sensor--------0000--
Zigbee/examples/Zigbee_Color_Dimmable_Light--------0000--
Zigbee/examples/Zigbee_Contact_Switch--------0000--
Zigbee/examples/Zigbee_Dimmable_Light--------0000--
Zigbee/examples/Zigbee_Electrical_DC_Sensor--------0000--
Zigbee/examples/Zigbee_Illuminance_Sensor--------0000--
Zigbee/examples/Zigbee_OTA_Client--------0000--
Zigbee/examples/Zigbee_Occupancy_Sensor--------0000--
Zigbee/examples/Zigbee_On_Off_Light--------0000--
Zigbee/examples/Zigbee_On_Off_MultiSwitch--------0000--
Zigbee/examples/Zigbee_PM25_Sensor--------0000--
Zigbee/examples/Zigbee_Power_Outlet--------0000--
Zigbee/examples/Zigbee_Pressure_Flow_Sensor--------0000--
Zigbee/examples/Zigbee_Scan_Networks--------0000--
Zigbee/examples/Zigbee_Temp_Hum_Sensor_Sleepy--------0000--
Zigbee/examples/Zigbee_Temperature_Sensor--------0000--
Zigbee/examples/Zigbee_Vibration_Sensor--------0000--
Zigbee/examples/Zigbee_Wind_Speed_Sensor--------0000--
Zigbee/examples/Zigbee_Window_Covering--------0000--
BluetoothSerial/examples/DiscoverConnect------------00
BluetoothSerial/examples/GetLocalMAC------------00
BluetoothSerial/examples/SerialToSerialBT------------00
BluetoothSerial/examples/SerialToSerialBTM------------00
BluetoothSerial/examples/SerialToSerialBT_Legacy------------00
BluetoothSerial/examples/SerialToSerialBT_SSP------------00
BluetoothSerial/examples/bt_classic_device_discovery------------00
BluetoothSerial/examples/bt_remove_paired_devices------------00
ESP32/examples/DeepSleep/SmoothBlink_ULP_Code------------00
Ethernet/examples/ETH_LAN8720------------00

@me-no-dev me-no-dev merged commit cbdaee6 into master Jun 10, 2025
57 checks passed
@me-no-dev me-no-dev deleted the feat/ledc-timer-autoselect branch June 10, 2025 09:57
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@me-no-dev me-no-dev me-no-dev approved these changes

@lucasssvaz lucasssvaz lucasssvaz approved these changes

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Area: Peripherals API Relates to peripheral's APIs. Status: Pending Merge Pull Request is ready to be merged
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Arduino ESP32 Core Project Roadmap
Status: Done
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ESP32-S3 Ledc different resolutions cause wrong duty update
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