OLED show text in bootloader

RE: OLED show text in bootloader

Jørgen Holmefjord — Fri, 22 Jul 2022 12:09:39 GMT

[quote user="yuyou"]

large array in app work well, but in bootloader will destroy flash memory?

or need set larger IRAM1 size. the max IRAM1 size is?

[/quote]

The application and bootloader usually can use the same RAM size, as they do not run at the same time. Maximum RAM size is determined by the chip type, see Adjustment of RAM and Flash Memory tutorial.

RE: OLED show text in bootloader

yoyou — Sat, 02 Jul 2022 01:29:28 GMT

Hi,

thanks for reply,

the spi pins is follow,it work well in app.

no pin of these overlap with the RESET pin for the nRF52840;

#define spi_miso_pin 23
#define spi_mosi_pin 20
#define spi_sck_pin 19

How do you know that the reset button is not working?

because RTT no logs output when button reset;

After a night's effort, i find the problem is Font array is too large.

i set array minimization, it can button reset, and all work well.

large array in app work well, but in bootloader will destroy flash memory?

or need set larger IRAM1 size. the max IRAM1 size is?

Best regards

RE: OLED show text in bootloader

Jørgen Holmefjord — Fri, 01 Jul 2022 14:07:59 GMT

Hi,

Which pins do you use for SPI? Do any of these overlap with the RESET pin for the nRF52840?

[quote user=""]

when no app, bootloader can show text in OLED, but Reset button will can't restart,no logs output,

breakdown or Flash memory is damaged?

if remove the line of nrf_drv_spi_init, Reset button will no show text and can got logs output.

[/quote]

The reset button should normally not be affected by what is running on the chip, as this is enabled in UICR, either during programming or by the application). Once it is enabled, it will be enabled until UICR is erased.

How do you know that the reset button is not working? Could it be an error in your bootloader code causing it to be stuck in a reset loop?

Best regards,
Jørgen