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Add resumeDMAoutput() to resume DMA after stopDMAoutput() #939

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Merged
mrcodetastic merged 1 commit into from
Jul 5, 2026
Merged

Add resumeDMAoutput() to resume DMA after stopDMAoutput() #939

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13 changes: 12 additions & 1 deletion src/ESP32-HUB75-MatrixPanel-I2S-DMA.h
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Original file line number Diff line number Diff line change
Expand Up @@ -707,7 +707,9 @@ class MatrixPanel_I2S_DMA
}

/**
* Stop the ESP32 DMA Engine. Screen will forever be black until next ESP reboot.
* Stop the ESP32 DMA Engine, keeping buffers and config intact so output can be
* resumed later via resumeDMAoutput(). Useful to reduce power draw / 'turn off' the
* panel when not in use, or to quiet its RF emissions during WiFi transfers.
*/
void stopDMAoutput()
{
Expand All @@ -716,6 +718,15 @@ class MatrixPanel_I2S_DMA
dma_bus.dma_transfer_stop();
}

/**
* Resume DMA output after a stopDMAoutput() call.
* Note: stopDMAoutput() blanks the framebuffer (brightness is preserved), so redraw after.
*/
void resumeDMAoutput()
{
dma_bus.dma_transfer_start();
}

// ------- PROTECTED -------
// those might be useful for child classes, like VirtualMatrixPanel
protected:
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