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ST STM32U0: definition of USART4 is missing #84459

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dm5tt opened this issue Jan 23, 2025 · 3 comments · May be fixed by #84537
Open

ST STM32U0: definition of USART4 is missing #84459

dm5tt opened this issue Jan 23, 2025 · 3 comments · May be fixed by #84537
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@erwango
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area: Boards Enhancement Changes/Updates/Additions to existing features platform: STM32 ST Micro STM32

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@dm5tt
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dm5tt commented Jan 23, 2025 •
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Describe the bug

While playing around with the ST STM32U083CCT6 I wasn't able to address USART4 for console applications.

Having a look into all dts/arm/st/u0/stm32u0*.dtsi showed that the definition of that interface is missing entirely.

Fix

Looking up the datasheet at page 60 shows

Image

Adding following lines to zephyr/dts/arm/st/u0/stm32u0.dtsi solves the issue.

usart4: serial@40004C00 {
	compatible = "st,stm32-usart", "st,stm32-uart";
	reg = <0x40004C00 0x400>;
	clocks = <&rcc STM32_CLOCK(APB1, 19U)>;
	resets = <&rctl STM32_RESET(APB1L, 19U)>;
	interrupts = <30 0>;
	status = "disabled";
};

Note: A implemented demo worked perfectly with these parameters. But I'm not able to verify them 100% right now, especially interrupts .
@dm5tt dm5tt added the bug The issue is a bug, or the PR is fixing a bug label Jan 23, 2025
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Even though I'm a bot, I can assure you that the whole community is genuinely grateful for your time and effort. 🤖💙

@dm5tt dm5tt changed the title ST STM32U0: definition USART4 is missing ST STM32U0: definition of USART4 is missing Jan 23, 2025
@kartben
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kartben commented Jan 24, 2025 •
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@dm5tt i can feel a pull request coming from you in the very near future? 😊 Thanks for taking the time to report the issue!

@erwango erwango added Enhancement Changes/Updates/Additions to existing features and removed bug The issue is a bug, or the PR is fixing a bug labels Jan 24, 2025
@dm5tt
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dm5tt commented Jan 24, 2025

Right feeling :-) Will take care of a pull request the next days.

dm5tt added a commit to dm5tt/zephyr that referenced this issue Jan 24, 2025
@dm5tt
dts: arm: st: u0: add missing USART4 to .dtsi
3e1bf24 
Sources of information:
- address: "RM0503 Reference Manual", p. 60
- interrupts: "RM0503 Reference Manual", p. 260

Fixes: zephyrproject-rtos#84459

Signed-off-by: Holger Adams <[email protected]>
@dm5tt dm5tt mentioned this issue Jan 24, 2025
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dm5tt added a commit to dm5tt/zephyr that referenced this issue Jan 24, 2025
@dm5tt
dts: arm: st: u0: add missing USART4 to .dtsi
375a960 
Sources of information:
- address: "RM0503 Reference Manual", p. 60
- interrupts: "RM0503 Reference Manual", p. 260

Fixes: zephyrproject-rtos#84459

Signed-off-by: Holger Adams <[email protected]>
@dm5tt dm5tt linked a pull request Jan 24, 2025 that will close this issue
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@kartben @erwango @dm5tt