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Added display API function to set LCD contrast

This commit is contained in:
Silvano Seva 2021-01-26 08:53:42 +01:00
parent e49c6e036c
commit 92870f477f
4 changed files with 38 additions and 11 deletions
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8
openrtx/include/interfaces/display.h
View File

@ -96,4 +96,12 @@ void display_render();
*/ */
bool display_renderingInProgress(); bool display_renderingInProgress();
/**
* Set display contrast.
* NOTE: not all the display controllers support contrast control, thus on some
* targets this function has no effect.
* @param contrast: display contrast, normalised value with range 0 - 255.
*/
void display_setContrast(uint8_t contrast);
#endif /* DISPLAY_H */ #endif /* DISPLAY_H */

6
platform/drivers/display/HX83XX_MDx.c
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@ -418,3 +418,9 @@ void *display_getFrameBuffer()
{ {
return (void *)(frameBuffer); return (void *)(frameBuffer);
} }
void display_setContrast(uint8_t contrast)
{
/* This controller does not support contrast regulation */
(void) contrast;
}

17
platform/drivers/display/UC1701_GD77.c
View File

@ -91,11 +91,9 @@ void display_init()
gpio_clearPin(LCD_CS); gpio_clearPin(LCD_CS);
gpio_clearPin(LCD_RS); /* RS low -> command mode */ gpio_clearPin(LCD_RS); /* RS low -> command mode */
// sendByteToController(0xE2); /* System Reset */
sendByteToController(0x2F); /* Voltage Follower On */ sendByteToController(0x2F); /* Voltage Follower On */
sendByteToController(0x81); /* Set Electronic Volume = 15 */ sendByteToController(0x81); /* Set Electronic Volume */
/* TODO variable contrast */ sendByteToController(0x15); /* Contrast, initial setting */
sendByteToController(0x15); /* Contrast */
sendByteToController(0xA2); /* Set Bias = 1/9 */ sendByteToController(0xA2); /* Set Bias = 1/9 */
sendByteToController(0xA1); /* A0 Set SEG Direction */ sendByteToController(0xA1); /* A0 Set SEG Direction */
sendByteToController(0xC0); /* Set COM Direction */ sendByteToController(0xC0); /* Set COM Direction */
@ -130,7 +128,9 @@ void display_renderRow(uint8_t row)
count--; count--;
} }
} }
for (uint8_t s = 0; s < 8; s++){
for (uint8_t s = 0; s < 8; s++)
{
sendByteToController(tmp[s]); sendByteToController(tmp[s]);
} }
} }
@ -166,3 +166,10 @@ void *display_getFrameBuffer()
{ {
return (void *)(frameBuffer); return (void *)(frameBuffer);
} }
void display_setContrast(uint8_t contrast)
{
gpio_clearPin(LCD_RS); /* RS low -> command mode */
sendByteToController(0x81); /* Set Electronic Volume */
sendByteToController(contrast >> 2); /* Controller contrast range is 0 - 63 */
}

6
platform/drivers/display/display_libSDL.c
View File

@ -196,3 +196,9 @@ void *display_getFrameBuffer()
{ {
return (void *) (frameBuffer); return (void *) (frameBuffer);
} }
void display_setContrast(uint8_t contrast)
{
printf("Setting display contrast to %d\n", contrast);
}