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zephyr stm32u073 usb

pokitoz
Associate II

‎2025-10-05 9:30 AM

Hello,

I am trying to get the USB HID working on STM32U073 with ZephyrOS.

I took the sample code from https://github.com/zephyrproject-rtos/zephyr/tree/v4.2.0/samples/subsys/usb/hid-mouse
And tried both the NEXT and legacy USB stack. 

However, when I boot, I always get the USB Not recognised popup along with the following logs:

 

00> [00:00:00.003,000] <dbg> usb_device: usb_enable: lock usb_enable_lock mutex
00> [00:00:00.011,000] <dbg> usb_descriptor: usb_get_device_descriptor: __usb_descriptor_start 0x20000594
00> [00:00:00.021,000] <dbg> usb_descriptor: usb_get_device_descriptor: __usb_descriptor_end 0x2000062e
00> [00:00:00.031,000] <dbg> usb_descriptor: usb_fix_descriptor: Device descriptor 0x20000594
00> [00:00:00.040,000] <dbg> usb_dc_stm32: usb_dc_ep_check_cap: ep 0, mps 64, type 0
00> [00:00:00.049,000] <dbg> usb_descriptor: usb_desc_update_mps0: Set bMaxPacketSize0 64
00> [00:00:00.057,000] <dbg> usb_descriptor: usb_fix_descriptor: Configuration descriptor 0x200005a6
00> [00:00:00.067,000] <dbg> usb_descriptor: usb_fix_descriptor: Interface descriptor 0x200005af
00> [00:00:00.077,000] <dbg> usb_descriptor: usb_fix_descriptor: Endpoint descriptor 0x200005c1
00> [00:00:00.086,000] <dbg> usb_dc_stm32: usb_dc_ep_check_cap: ep 81, mps 16, type 3
00> [00:00:00.094,000] <dbg> usb_descriptor: usb_validate_ep_cfg_data: Fixing EP address 80 -> 81
00> [00:00:00.104,000] <dbg> usb_descriptor: usb_validate_ep_cfg_data: endpoint 0x81
00> [00:00:00.112,000] <dbg> usb_descriptor: usb_fix_descriptor: Now the wTotalLength is 34
00> [00:00:00.121,000] <dbg> usb_descriptor: ascii7_to_utf16le: idx_max 11, ascii_idx_max 5, buf 0x200005ce
00> [00:00:00.131,000] <dbg> usb_descriptor: ascii7_to_utf16le: char R : 52, idx 5 -> 11
00> [00:00:00.140,000] <dbg> usb_descriptor: ascii7_to_utf16le: char Y : 59, idx 4 -> 9
00> [00:00:00.149,000] <dbg> usb_descriptor: ascii7_to_utf16le: char H : 48, idx 3 -> 7
00> [00:00:00.157,000] <dbg> usb_descriptor: ascii7_to_utf16le: char P : 50, idx 2 -> 5
00> [00:00:00.166,000] <dbg> usb_descriptor: ascii7_to_utf16le: char E : 45, idx 1 -> 3
00> [00:00:00.174,000] <dbg> usb_descriptor: ascii7_to_utf16le: char Z : 5a, idx 0 -> 1
00> [00:00:00.183,000] <dbg> usb_descriptor: ascii7_to_utf16le: idx_max 45, ascii_idx_max 22, buf 0x200005dc
00> [00:00:00.194,000] <dbg> usb_descriptor: ascii7_to_utf16le: char e : 65, idx 22 -> 45
00> [00:00:00.202,000] <dbg> usb_descriptor: ascii7_to_utf16le: char l : 6c, idx 21 -> 43
00> [00:00:00.211,000] <dbg> usb_descriptor: ascii7_to_utf16le: char p : 70, idx 20 -> 41
00> [00:00:00.220,000] <dbg> usb_descriptor: ascii7_to_utf16le: char m : 6d, idx 19 -> 39
00> [00:00:00.229,000] <dbg> usb_descriptor: ascii7_to_utf16le: char a : 61, idx 18 -> 37
00> [00:00:00.238,000] <dbg> usb_descriptor: ascii7_to_utf16le: char s : 73, idx 17 -> 35
00> [00:00:00.246,000] <dbg> usb_descriptor: ascii7_to_utf16le: char   : 20, idx 16 -> 33
00> [00:00:00.255,000] <dbg> usb_descriptor: ascii7_to_utf16le: char e : 65, idx 15 -> 31
00> [00:00:00.264,000] <dbg> usb_descriptor: ascii7_to_utf16le: char s : 73, idx 14 -> 29
00> [00:00:00.273,000] <dbg> usb_descriptor: ascii7_to_utf16le: char u : 75, idx 13 -> 27
00> [00:00:00.282,000] <dbg> usb_descriptor: ascii7_to_utf16le: char o : 6f, idx 12 -> 25
00> [00:00:00.290,000] <dbg> usb_descriptor: ascii7_to_utf16le: char m : 6d, idx 11 -> 23
00> [00:00:00.299,000] <dbg> usb_descriptor: ascii7_to_utf16le: char   : 20, idx 10 -> 21
00> [00:00:00.308,000] <dbg> usb_descriptor: ascii7_to_utf16le: char D : 44, idx 9 -> 19
00> [00:00:00.317,000] <dbg> usb_descriptor: ascii7_to_utf16le: char I : 49, idx 8 -> 17
00> [00:00:00.325,000] <dbg> usb_descriptor: ascii7_to_utf16le: char H : 48, idx 7 -> 15
00> [00:00:00.334,000] <dbg> usb_descriptor: ascii7_to_utf16le: char   : 20, idx 6 -> 13
00> [00:00:00.343,000] <dbg> usb_descriptor: ascii7_to_utf16le: char r : 72, idx 5 -> 11
00> [00:00:00.351,000] <dbg> usb_descriptor: ascii7_to_utf16le: char y : 79, idx 4 -> 9
00> [00:00:00.360,000] <dbg> usb_descriptor: ascii7_to_utf16le: char h : 68, idx 3 -> 7
00> [00:00:00.369,000] <dbg> usb_descriptor: ascii7_to_utf16le: char p : 70, idx 2 -> 5
00> [00:00:00.377,000] <dbg> usb_descriptor: ascii7_to_utf16le: char e : 65, idx 1 -> 3
00> [00:00:00.386,000] <dbg> usb_descriptor: ascii7_to_utf16le: char Z : 5a, idx 0 -> 1
00> [00:00:00.395,000] <dbg> usb_descriptor: usb_update_sn_string_descriptor: Serial Number
00>                                          32 34 50 09 00 28 00 3b                          |24P..(.;         
00> [00:00:00.414,000] <dbg> usb_descriptor: ascii7_to_utf16le: idx_max 31, ascii_idx_max 15, buf 0x2000060c
00> [00:00:00.425,000] <dbg> usb_descriptor: ascii7_to_utf16le: char B : 42, idx 15 -> 31
00> [00:00:00.433,000] <dbg> usb_descriptor: ascii7_to_utf16le: char 3 : 33, idx 14 -> 29
00> [00:00:00.442,000] <dbg> usb_descriptor: ascii7_to_utf16le: char 0 : 30, idx 13 -> 27
00> [00:00:00.451,000] <dbg> usb_descriptor: ascii7_to_utf16le: char 0 : 30, idx 12 -> 25
00> [00:00:00.460,000] <dbg> usb_descriptor: ascii7_to_utf16le: char 8 : 38, idx 11 -> 23
00> [00:00:00.469,000] <dbg> usb_descriptor: ascii7_to_utf16le: char 2 : 32, idx 10 -> 21
00> [00:00:00.477,000] <dbg> usb_descriptor: ascii7_to_utf16le: char 0 : 30, idx 9 -> 19
00> [00:00:00.486,000] <dbg> usb_descriptor: ascii7_to_utf16le: char 0 : 30, idx 8 -> 17
00> [00:00:00.495,000] <dbg> usb_descriptor: ascii7_to_utf16le: char 9 : 39, idx 7 -> 15
00> [00:00:00.504,000] <dbg> usb_descriptor: ascii7_to_utf16le: char 0 : 30, idx 6 -> 13
00> [00:00:00.512,000] <dbg> usb_descriptor: ascii7_to_utf16le: char 0 : 30, idx 5 -> 11
00> [00:00:00.521,000] <dbg> usb_descriptor: ascii7_to_utf16le: char 5 : 35, idx 4 -> 9
00> [00:00:00.530,000] <dbg> usb_descriptor: ascii7_to_utf16le: char 4 : 34, idx 3 -> 7
00> [00:00:00.538,000] <dbg> usb_descriptor: ascii7_to_utf16le: char 3 : 33, idx 2 -> 5
00> [00:00:00.547,000] <dbg> usb_descriptor: ascii7_to_utf16le: char 2 : 32, idx 1 -> 3
00> [00:00:00.555,000] <dbg> usb_descriptor: ascii7_to_utf16le: char 3 : 33, idx 0 -> 1
00> [00:00:00.564,000] <dbg> usb_dc_stm32: usb_dc_set_status_callback: 
00> [00:00:00.571,000] <dbg> usb_dc_stm32: usb_dc_attach: 
00> [00:00:00.577,000] <dbg> usb_dc_stm32: usb_dc_stm32_init: Pinctrl signals configuration
00> [00:00:00.586,000] <dbg> usb_dc_stm32: usb_dc_stm32_init: HAL_PCD_Init
00> [00:00:00.593,000] <dbg> usb_dc_stm32: usb_dc_stm32_init: HAL_PCD_Stop
00> [00:00:00.600,000] <dbg> usb_dc_stm32: usb_dc_stm32_init: HAL_PCD_Start
00> [00:00:00.608,000] <dbg> usb_dc_stm32: usb_dc_ep_configure: ep 0x00, previous ep_mps 64, ep_mps 64, ep_type 0
00> [00:00:00.619,000] <dbg> usb_dc_stm32: usb_dc_ep_configure: ep 0x80, previous ep_mps 64, ep_mps 64, ep_type 0
00> [00:00:00.630,000] <dbg> usb_dc_stm32: usb_dc_ep_set_callback: ep 0x00
00> [00:00:00.637,000] <dbg> usb_dc_stm32: usb_dc_ep_set_callback: ep 0x80
00> [00:00:00.645,000] <dbg> usb_dc_stm32: HAL_PCD_SuspendCallback: 
00> [00:00:00.651,000] <inf> usb_hid: Device suspended
00> [00:00:00.657,000] <dbg> usb_device: composite_setup_ep_cb: set cb, ep: 0x81
00> [00:00:00.665,000] <dbg> usb_dc_stm32: usb_dc_ep_set_callback: ep 0x81
00> [00:00:00.672,000] <dbg> usb_dc_stm32: usb_dc_ep_enable: ep 0x00
00> [00:00:00.679,000] <dbg> usb_dc_stm32: usb_dc_ep_enable: HAL_PCD_EP_Open(0x00, 64, 0)
00> [00:00:00.688,000] <dbg> usb_dc_stm32: usb_dc_ep_enable: ep 0x80
00> [00:00:00.695,000] <dbg> usb_dc_stm32: usb_dc_ep_enable: HAL_PCD_EP_Open(0x80, 64, 0)
00> [00:00:00.704,000] <dbg> usb_device: usb_enable: unlock usb_enable_lock mutex
00> [00:00:00.820,000] <dbg> usb_dc_stm32: HAL_PCD_ResumeCallback: 
00> [00:00:00.826,000] <inf> usb_hid: Device resumed
00> [00:00:00.832,000] <inf> usb_hid: from suspend
00> [00:00:00.873,000] <dbg> usb_dc_stm32: HAL_PCD_ResetCallback: 
00> [00:00:00.880,000] <inf> usb_hid: Device reset detected
00> [00:00:01.552,000] <dbg> usb_dc_stm32: HAL_PCD_ResetCallback: 
00> [00:00:01.558,000] <inf> usb_hid: Device reset detected
00> [00:00:02.230,000] <dbg> usb_dc_stm32: HAL_PCD_ResetCallback: 
00> [00:00:02.236,000] <inf> usb_hid: Device reset detected
00> [00:00:02.908,000] <dbg> usb_dc_stm32: HAL_PCD_ResetCallback: 
00> [00:00:02.915,000] <inf> usb_hid: Device reset detected
00> [00:00:03.041,000] <dbg> usb_dc_stm32: HAL_PCD_SuspendCallback: 
00> [00:00:03.048,000] <inf> usb_hid: Device suspended

 

I guess that I might have missconfigured the clocks in the DTS:

#include <st/u0/stm32u073Xc.dtsi>
#include <st/u0/stm32u073rctx-pinctrl.dtsi>
 

 

	hid_dev_0: hid_dev_0 {
		compatible = "zephyr,hid-device";
		label = "HID0";
		protocol-code = "none";
		in-polling-period-us = <1000>;
		in-report-size = <64>;
	};


...

&clk_hsi {
	status = "okay";
};

&clk_hsi48 {
	status = "okay";
};

&clk_lse {
	status = "okay";
};

&clk_lsi {
	status = "okay";
};

&pll {
	div-m = <1>;
	mul-n = <6>;
	div-p = <2>;
	div-q = <2>;
	div-r = <2>;
	clocks = <&clk_hsi>;
	status = "okay";
};

&rcc {
	clocks = <&pll>;
	clock-frequency = <DT_FREQ_M(48)>;
	ahb-prescaler = <1>;
	apb1-prescaler = <1>;
};

zephyr_udc0: &usb {
	clocks = <&rcc STM32_CLOCK(APB1, 13)>,
		 <&rcc STM32_SRC_HSI48 CLK48_SEL(1)>;
	pinctrl-0 = <&usb_dm_pa11 &usb_dp_pa12>;
	pinctrl-names = "default";
	status = "okay";
};

&rtc {
	clocks = <&rcc STM32_CLOCK(APB1, 10)>,
		 <&rcc STM32_SRC_LSE RTC_SEL(1)>;
	status = "okay";
};

&clk_hsi48 {
    #clock-cells = <0>;
    compatible = "st,stm32-hsi48-clock";
    clock-frequency = <DT_FREQ_M(48)>;
    status = "okay";
};

 

Is the current zephyr code working on the U073 board?

Am I missing something in the DTS?

 

Thanks a lot

Labels:
0 Kudos
1 REPLY 1
FBL
ST Employee

‎2025-10-13 9:02 AM

Hi @pokitoz 

Have you tried running the example firmware that is officially supported on your board? If that works without issues, you can narrow down the root cause by focusing on whether it is related to:

  • Clock configuration
  • Pinout settings
  • USB descriptor
  • Zephyr USB stack integration

As a next step, I recommend testing with a minimal Zephyr configuration that reduces the kernel footprint:

  • Use cooperative threading or idle threads
  • Disable unnecessary subsystems but keep kernel enabled

If still having issues, I suggest to check with Zephyr community support channels,

:speech_balloon: Discord Server for real-time community discussions
:e_mail: User mailing list (users@lists.zephyrproject.org)

Ensure using latest version of drivers.

To give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.


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