2017-11-19 03:55 AM
Dear STMicro,
I bought an STM32F769 Discovery kit but cannot use it for a very frustrating reason. When I switch it on, it generates a high pitched noise driving me crazy. The noise is not loud, but the high tone (high pitch) is extremely annoying.
I think it is related to the display.
Can you please help?
#use-stm32f769-discovery-board #stm32f769i-discoSolved! Go to Solution.
2017-11-19 05:01 AM
after your call to BSP_LCD_Init(); add this:
uint8_t lcd_brightness[] = {OTM8009A_CMD_WRDISBV, 0xFF};
DSI_IO_WriteCmd(0, (uint8_t *)lcd_brightness); // stop the whine
2017-11-19 05:01 AM
after your call to BSP_LCD_Init(); add this:
uint8_t lcd_brightness[] = {OTM8009A_CMD_WRDISBV, 0xFF};
DSI_IO_WriteCmd(0, (uint8_t *)lcd_brightness); // stop the whine
2017-11-19 09:56 AM
Hi John Doe,
This is awesome! Thank you so much, it worked immediately.How did you find this?
You seem to know a lot about how to drive displays. What library do you use for your graphics? I know there are a few commecial ones, like uGFX, Embedded Wizard, ... but I would like to use an open-source one.
2017-11-19 10:44 AM
I don't know anything about driving displays, I just have the same board with the same problem. I got the info from this thread:
https://community.st.com/0D50X00009XkfGQSAZ
I haven't played around with this board very much, so I haven't chosen a graphics library.