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Fix ST7787 display rotation 

With this change, both the hardware-scrolling examples (TFT_Terminal and
TFT_Matrix) work correctly.

Rotations 0, 1, 2, and 3 are defined as successive clockwise 90 degree
rotations.

Vertical refresh is defined to be in direction from low to high coordinate
("top to bottom", or "left to right" in landscape orientations).
This commit is contained in:
Kristian Nielsen 2017-08-01 11:43:57 +02:00
parent e99e5a856b
commit b33b88c648
1 changed files with 11 additions and 3 deletions
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14
TFT_Drivers/ST7787_Rotation.h
View File

@ -1,17 +1,25 @@
// This is the command sequence that rotates the ST7735 driver coordinate frame
// This is the command sequence that rotates the ST7787 driver coordinate frame
//
// Rotation 0 is portrait mode. Rotations 1, 2, and 3 are rotated clockwise
// by 90, 180, and 270 degrees.
//
// Vertical refresh direction is set to be the same as data write order.
// So coordinate 0 is refresh first, and coordinate 319 is refreshed last.
// For some reason, counter to datasheet information, MADCTL must be set
// with the ML bit as the inverse of the MY bit to achieve this.
rotation = m % 4; // Limit the range of values to 0-3
writecommand(TFT_MADCTL);
switch (rotation) {
case 0:
writedata(TFT_MAD_RGB);
writedata(TFT_MAD_ML | TFT_MAD_RGB);
_width = TFT_WIDTH;
_height = TFT_HEIGHT;
break;
case 1:
writedata(TFT_MAD_MX | TFT_MAD_MV | TFT_MAD_RGB);
writedata(TFT_MAD_ML | TFT_MAD_MX | TFT_MAD_MV | TFT_MAD_RGB);
_width = TFT_HEIGHT;
_height = TFT_WIDTH;
break;