circuitpython/stmhal/boards/CERB40/pins.csv

1	JP1	3.3V
2	JP2	GND
3	JP3	PA8
4	JP4	PA13
5	JP5	PA7
6	JP6	PA6
7	JP7	PC10
8	JP8	PA14
9	JP9	PC11
10	JP10	PB4
11	JP11	PB9
12	JP12	PB3
13	JP13	PD2
14	JP14	PC12
15	JP15	VBAT
16	JP16	PB8
17	JP17	Loader
18	JP18	PB7
19	JP19	PB6
20	JP20	PB5
21	JP21	Reset
22	JP22	PC0
23	JP23	PC1
24	JP24	PC2
25	JP25	PC3
26	JP26	PA0
27	JP27	PA1
28	JP28	PA2
29	JP29	PA3
30	JP30	PA4
31	JP31	PA5
32	JP32	PB10
33	JP33	PB11
34	JP34	PB14
35	JP35	PB15
36	JP36	PC6
37	JP37	PC7
38	JP38	PC8
39	JP39	PC9
40	JP40	VUSB
41	UART1_TX	PA9
42	UART1_RX	PA10
43	UART3_TX	PD8
44	UART3_RX	PD9
45	UART3_RTS	PD12
46	UART3_CTS	PD11