STM32F103C8 using SPI2

hamo · ‎2024-02-08

Hello,

i am trying to interface 1.8 inch SPI TFT Display 128 x 160 to the STM32F103C8 using SPI2.

SPI1 is used for LoRa, i thought to connect TFT too to SPI1 using addresses but i am affraid to influence the

LoRa.

A year earlier i tried to interface LoRa to STM32F103C8 using SPI2 but without success.

Is it a general problem in STM32F103C8 using SPI2?

Any help is appreciated.

hamo · ‎2024-02-13

i have used logic analyzer and figured out that there is no clock.

Here is a capture of the SPI2:

The only toggle is when i reset the bluepill.

Andrew Neil · ‎2024-02-13

What code is this?

Have you got a basic SPI example working on SPI2?

hamo · ‎2024-02-13

This code is to make ST7735 TFT work.

Which example do you mean?

Andrew Neil · ‎2024-02-13

You just need the simplest SPI example you can find - one which does just SPI and nothing else.

You need to get the basic comms working before adding complications like a TFT display!

Otherwise you won't know if the problems are with the SPI itself, or elsewhere in all the mountains of other code.

ST publishes basic peripheral examples; eg, in the Cube IDE ...

EDIT:

https://www.st.com/en/embedded-software/stm32cubef1.html

AScha.3 · ‎2024-02-13

Yes - i have just now a small 2,2" TFT on SPI2 running, on a "blue pill" board.

How you set the spi2 in Cube ? ed , ok i seen it.

I have it at 18Mbit...and using CubeIDE .

->

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hamo · ‎2024-02-13

@AScha.3 thanks for for your reply.

can you please share your STM32CubeMX settings?

@Andrew Neil thanks, i will do that surely

AScha.3 · ‎2024-02-13

My spi2 setting: (+ pin speed: high )

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hamo · ‎2024-02-13

and which pins do you use for CS, RESET and DC?

Are you clocking at max 72 MHz?

AScha.3 · ‎2024-02-13

Yes , core at 72 M.

CS.. are just any I/O pins, that are close (for wiring...i hate, to have a wire cross the board. :) )

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hamo · ‎2024-02-13

@AScha.3 i have just tried this settings and compiled the code and uploaded, it stills not working for me.

I used the logic analyzer -> all the pins (SPI2) are not toggling.