69 lines
2.7 KiB
C++
69 lines
2.7 KiB
C++
#ifndef _ESP32_ONE_EIGHT_SCAN_PANEL
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#define _ESP32_ONE_EIGHT_SCAN_PANEL
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#include <ESP32-VirtualMatrixPanel-I2S-DMA.h>
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/* This class inherits all the goodness of the VirtualMatrixPanel class used to created
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large displays of chained panels, but does trickery to convert from 1/16 to 1/8
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DMA output.
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Some guidance given by looking at hzeller's code, in relation to the 'stretch factor'
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concept where these panels are really double width and half the height, from the perspective
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of the digital input required to get the 'real world' resolution and output.
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https://github.com/hzeller/rpi-rgb-led-matrix/blob/master/lib/multiplex-mappers.cc
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*/
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class OneEightScanPanel : public VirtualMatrixPanel
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{
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public:
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using VirtualMatrixPanel::VirtualMatrixPanel; // inherit VirtualMatrixPanel's constructor(s)
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protected:
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/* Convert Real World 'VirtualMatrixPanel' co-ordinates (i.e. Real World pixel you're looking at
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on the panel or chain of panels, per the chaining configuration) to a 1/8 panels
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double 'stretched' and 'squished' coordinates which is what needs to be sent from the
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DMA buffer.
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Note: Look at the One_Eight_1_8_ScanPanel code and you'll see that the DMA buffer is setup
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as if the panel is 2 * W and 0.5 * H !
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*/
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VirtualCoords getCoords(int16_t &x, int16_t &y);
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}; // end class header note the ;
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inline VirtualCoords OneEightScanPanel::getCoords(int16_t &x, int16_t &y) {
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VirtualMatrixPanel::getCoords(x, y); // call to base to update coords for chaining approach
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if ( coords.x == -1 || coords.y == -1 ) { // Co-ordinates go from 0 to X-1 remember! width() and height() are out of range!
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return coords;
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}
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/*
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Serial.print("VirtualMatrixPanel Mapping ("); Serial.print(x, DEC); Serial.print(","); Serial.print(y, DEC); Serial.print(") ");
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// to
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Serial.print("to ("); Serial.print(coords.x, DEC); Serial.print(","); Serial.print(coords.y, DEC); Serial.println(") ");
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*/
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if ( (y & 8) == 0) {
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coords.x += ((coords.x / panelResX)+1)*panelResX; // 1st, 3rd 'block' of 8 rows of pixels, offset by panel width in DMA buffer
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}
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else {
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coords.x += (coords.x / panelResX)*panelResX; // 2nd, 4th 'block' of 8 rows of pixels, offset by panel width in DMA buffer
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}
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// http://cpp.sh/4ak5u
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// Real number of DMA y rows is half reality
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// coords.y = (y / 16)*8 + (y & 0b00000111);
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coords.y = (y >> 4)*8 + (y & 0b00000111);
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/*
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Serial.print("OneEightScanPanel Mapping ("); Serial.print(x, DEC); Serial.print(","); Serial.print(y, DEC); Serial.print(") ");
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// to
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Serial.print("to ("); Serial.print(coords.x, DEC); Serial.print(","); Serial.print(coords.y, DEC); Serial.println(") ");
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*/
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return coords;
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}
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#endif
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