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ili9341: tested backlight dimming (doesn't work with my displays, either)

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probably the LED pins are hardcoded with my displays. They respond neither
to PWM on the LED pin nor to ili9341 commands.
This commit is contained in:
Martin Preuss
2026-01-27 20:32:38 +01:00
parent 7411fd2a13
commit 74b4098608
1 changed files with 8 additions and 7 deletions
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15
avr/modules/lcd2/ili9341/main.asm
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@@ -46,7 +46,7 @@ ILI9341_Init:
rcall ILI9341_Reset rcall ILI9341_Reset
rcall ILI9341_LeaveSleepMode rcall ILI9341_LeaveSleepMode
ldi r16, 0xff ldi r16, 0x20
rcall ILI9341_SetBacklight rcall ILI9341_SetBacklight
sec sec
@@ -146,13 +146,14 @@ ILI9341_SetBacklight:
ILI9341_SetBacklight_on: ILI9341_SetBacklight_on:
sbi ILI9341_LED_OUTPUT, ILI9341_LED_PIN sbi ILI9341_LED_OUTPUT, ILI9341_LED_PIN
ret ; DEBUG ret ; DEBUG
push r16 push r16
rcall ili9341BeginSpi rcall ili9341BeginSpi
ldi r16, ILI9341_CMD_WRITECTLDISPLAY ldi r16, ILI9341_CMD_WRITECTLDISPLAY
rcall ili9341SendCommand rcall ili9341SendCommand
; ldi r16, 0b00100100 ; BCTRL=1, DD=1, BL=1 (or: 0x24 reported to work)
ldi r16, 0x24 ldi r16, (1<<5) | (1<<3) | (1<<2)
rcall ili9341SendData rcall ili9341SendData
ldi r16, ILI9341_CMD_SETDSPBRIGHTNESS ldi r16, ILI9341_CMD_SETDSPBRIGHTNESS
@@ -160,10 +161,10 @@ ret ; DEBUG
pop r16 pop r16
rcall ili9341SendData rcall ili9341SendData
ldi r16, 0xbe ; ldi r16, 0xbe
rcall ili9341SendCommand ; rcall ili9341SendCommand
ldi r16, 0x0f ; ldi r16, 0x0f
rcall ili9341SendData ; rcall ili9341SendData
rcall ili9341EndSpi rcall ili9341EndSpi