fix stm32u0 data stride by HiFiPhile · Pull Request #3472 · hathach/tinyusb

HiFiPhile · 2026-01-26T16:16:05Z

Describe the PR
STM32U0 has 1024 byte PMA and 32bit access width.

Signed-off-by: Zixun LI <admin@hifiphile.com>

Copilot

Pull request overview

This PR adjusts TinyUSB’s STM32 FS device configuration so that STM32U0, which has a 1024-byte PMA but 32-bit access width, uses the correct data/address stride and access scheme.

Changes:

In tusb_option.h, special-cases STM32U0 so that although CFG_TUSB_FSDEV_PMA_SIZE is 1024, it uses the 32-bit FIFO data and address stride settings previously used only for 2048-byte PMA devices.
In fsdev_common.h, similarly special-cases STM32U0 so that it uses the 32-bit PMA access scheme and FSDEV_BUS_32BIT definitions instead of the generic 1024-byte (16-bit) scheme.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/tusb_option.h	Adjusts FSDEV FIFO data/address stride macros so STM32U0 with 1024-byte PMA uses 32-bit (stride 4) configuration instead of the generic 16-bit configuration.
src/portable/st/stm32_fsdev/fsdev_common.h	Updates PMA access scheme selection so STM32U0 is treated like a 32-bit bus device despite having a 1024-byte PMA.

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src/portable/st/stm32_fsdev/fsdev_common.h

github-actions · 2026-01-26T16:24:30Z

TinyUSB Average Code Size Metrics

File	.text	.rodata	.data	.bss	size	%
cdc_host.c	6596	487	15	1539	8357	5.2%
ehci.c	2761	0	0	5970	7537	4.7%
ncm_device.c	1514	28	1408	5830	7358	4.6%
usbh.c	4395	60	63	954	5436	3.4%
hcd_dwc2.c	4893	30	0	512	5434	3.4%
midi_host.c	1353	7	7	3740	5097	3.2%
video_device.c	4391	5	1851	472	4855	3.0%
audio_device.c	2849	0	1248	1673	4518	2.8%
dcd_dwc2.c	4101	24	0	263	4387	2.7%
ohci.c	1942	0	0	2414	4356	2.7%
dcd_ch32_usbfs.c	1472	0	0	2444	3916	2.4%
hcd_stm32_fsdev.c	3282	0	1	420	3703	2.3%
usbd.c	3190	57	89	276	3531	2.2%
ecm_rndis_device.c	1037	0	1	2272	3310	2.1%
dcd_khci.c	1953	0	0	1290	3243	2.0%
hcd_musb.c	3073	0	0	157	3230	2.0%
dcd_ci_fs.c	1925	0	0	1290	3215	2.0%
dcd_nrf5x.c	2919	0	0	292	3211	2.0%
dcd_da146xx.c	3067	0	0	144	3211	2.0%
hcd_rusb2.c	2923	0	0	245	3168	2.0%
dcd_rusb2.c	2917	0	0	156	3073	1.9%
msc_device.c	2503	108	2274	538	3041	1.9%
hcd_ch32_usbfs.c	2484	0	0	498	2982	1.9%
hcd_khci.c	2442	0	0	449	2891	1.8%
dcd_stm32_fsdev.c	2557	0	0	291	2848	1.8%
dcd_mm32f327x_otg.c	1478	0	0	1290	2768	1.7%
dcd_musb.c	2431	0	0	160	2591	1.6%
hcd_samd.c	2220	0	0	324	2544	1.6%
dcd_ci_hs.c	1762	0	0	1280	2530	1.6%
dcd_eptri.c	2270	0	0	259	2529	1.6%
usbtmc_device.c	2176	24	69	291	2500	1.6%
hid_host.c	1206	0	0	1250	2456	1.5%
mtp_device.c	1689	22	1449	579	2275	1.4%
dcd_rp2040.c	859	20	604	655	2138	1.3%
dcd_ch32_usbhs.c	1648	0	0	448	2096	1.3%
cdc_device.c	1328	16	19	661	1988	1.2%
msc_host.c	1589	0	0	394	1984	1.2%
dcd_msp430x5xx.c	1796	0	0	176	1972	1.2%
hcd_rp2040.c	976	73	416	384	1849	1.2%
dcd_lpc17_40.c	1470	0	0	648	1794	1.1%
midi_device.c	1127	0	991	589	1714	1.1%
dcd_nuc505.c	0	0	1529	157	1686	1.0%
dcd_lpc_ip3511.c	1463	0	0	264	1639	1.0%
dcd_samg.c	1319	0	0	72	1391	0.9%
dcd_samd.c	1032	0	0	266	1298	0.8%
hub.c	1235	8	8	29	1268	0.8%
dcd_nuc121.c	1167	0	0	101	1268	0.8%
hid_device.c	1118	44	997	115	1233	0.8%
dcd_nuc120.c	1093	0	0	78	1171	0.7%
vendor_device.c	624	0	530	464	1087	0.7%
rp2040_usb.c	172	75	718	4	969	0.6%
dfu_device.c	744	28	712	183	926	0.6%
typec_stm32.c	820	8	2	12	842	0.5%
tusb_fifo.c	843	0	477	0	838	0.5%
usbc.c	420	2	20	166	608	0.4%
usbd_control.c	523	0	474	78	600	0.4%
dwc2_common.c	582	29	0	0	597	0.4%
hcd_pio_usb.c	262	0	240	0	502	0.3%
tusb.c	429	0	368	3	430	0.3%
hcd_ci_hs.c	190	0	0	0	190	0.1%
fsdev_common.c	180	0	0	0	180	0.1%
rusb2_common.c	160	0	16	0	176	0.1%
dfu_rt_device.c	156	0	134	0	156	0.1%
TOTAL	113096	1155	16730	45509	160691	100.0%