Pin #	Pin name	function	settings	comment
1	PE2	PWM0	AF2	TIM3 channels
2	PE3	PWM1	AF2	as PWM output
3	PE4	PWM2	AF2
4	PE5	PWM3	AF2
5	PE6	-	-
6	(vbat)
7	PC13	-	-
8	PC14	-	-
9	PC15	-	-
10	PF9	-	-
11	PF10	VadcON	slow out	turn ON ADC power
12	PF0	OSC IN
13	PF1	OSC OUT
14	(nrst)
15	PC0	ADC5	ADC1 in 6	Thermometers
16	PC1	ADC6	ADC1 in 7	(level-meter)
17	PC2	ADC7	ADC1 in 8	ADC channels
18	PC3	ADC8	ADC1 in 9
19	PF2	ADC9	ADC1 in 10
20	(VSSA)
21	(VREF+)
22	(VDDA)
23	PA0	ADC0	ADC1 in1
24	PA1	ADC1	ADC1 in2
25	PA2	ADC2	ADC1 in3
26	PA3	ADC3	ADC1 in4
27	PF4	ADC4	ADC1 in5
28	(VDD)
29	PA4	ADC ext.	ADC2 in1	ext. ADC channel
30	PA5	-	-
31	PA6	-	-
32	PA7	-	-
33	PC4	-	-	External USART
34	PC5	-	-
35	PB0	Buzzer	slow out	Signal buzzer
36	PB1	-	-
37	PB2	-	-
38	PE7	-	-
39	PE8	LED0	slow out	External LEDs
40	PE9	LED1	slow out
41	PE10	LED2	slow out
42	PE11	LED3	slow out
43	PE12	-	-
44	PE13	-	-
45	PE14	-	-
46	PE15	-	-
47	PB10	SCRN DCRS	slow out	Screen data/cmd
48	PB11	SCRN RST	slow out	Screen reset
49	(VSS)
50	(VDD)
51	PB12	SCRN LED	slow out	Screen LEDs on
52	PB13	SCRN SCK	AF5	SPI for screen
53	PB14	SCRN MISO	AF5
54	PB15	SCRN MOSI	AF5
55	PD8	-	-
56	PD9	BTN0	slow in PU	User buttons
57	PD10	BTN1	slow in PU
58	PD11	BTN2	slow in PU
59	PD12	BTN3	slow in PU
60	PD13	BTN4	slow in PU
61	PD14	BTN5	slow in PU
62	PD15	BTN6	slow in PU
63	PC6	-	-
64	PC7	-	-
65	PC8	-	-
66	PC9	USB PU	slow out	USB DP pullup
67	PA8	-	-
68	PA9	SCL	AF4 (I2C2)	external ADC
69	PA10	SDA	AF4
70	PA11	USB DM	AF14	USB
71	PA12	USB DP	AF14
72	PA13	SWDIO	dflt	dbg
73	PF6	-	-
74	(VSS)
75	(VDD)
76	PA14	SWCLK	dflt	dbg
77	PA15	-	-
78	PC10	Tx	AF7 (USART3)	Ext. UART
79	PC11	Rx	AF7	(alt.: AF5 - U4)
80	PC12	-	-
81	PD0	CAN Rx	AF7 (CAN)	CAN bus
82	PD1	CAN Tx	AF7
83	PD2	-	-
84	PD3	-	-
85	PD4	DE	slow out	0-rx, 1-tx (485)
86	PD5	U2Tx	AF7	RS-485
87	PD6	U2Rx	AF7
88	PD7	-	-
89	PB3	-	-
90	PB4	-	-
91	PB5	-	-
92	PB6	I2C1 SCL	AF4 (I2C1)	I2C for BME280
93	PB7	I2C1 SDA	AF4
94	(BOOT0)			boot mode
95	PB8	-	-
96	PB9	-	-
97	PE0	-	-
98	PE1	-	-
99	(VSS)
100	(VDD)

Sorted by port

// sort -Vk4 Readme.md

|Pin #|**Pin name **| function| settings|**comment ** | | 23 | PA0 | ADC0 | ADC1 in1 | | | 24 | PA1 | ADC1 | ADC1 in2 | | | 25 | PA2 | ADC2 | ADC1 in3 | | | 26 | PA3 | ADC3 | ADC1 in4 | | | 29 | PA4 | ADC ext. | ADC2 in1 | ext. ADC channel | | 30 | PA5 | - | - | | | 31 | PA6 | - | - | | | 32 | PA7 | - | - | | | 67 | PA8 | - | - | | | 68 | PA9 | SCL | AF4 (I2C2) | external ADC | | 69 | PA10 | SDA | AF4 | | | 70 | PA11 | USB DM | AF14 | USB | | 71 | PA12 | USB DP | AF14 | | | 72 | PA13 | SWDIO | AF0 | dbg | | 76 | PA14 | SWCLK | AF0 | dbg | | 77 | PA15 | - | - | | | 35 | PB0 | Buzzer | slow out | Signal buzzer | | 36 | PB1 | - | - | | | 37 | PB2 | - | - | | | 89 | PB3 | - | - | | | 90 | PB4 | - | - | | | 91 | PB5 | - | - | | | 92 | PB6 | I2C1 SCL | AF4 (I2C1) | I2C for BME280 | | 93 | PB7 | I2C1 SDA | AF4 | | | 95 | PB8 | - | - | | | 96 | PB9 | - | - | | | 47 | PB10 | SCRN DCRS | slow out | Screen data/cmd | | 48 | PB11 | SCRN RST | slow out | Screen reset | | 51 | PB12 | SCRN LED | slow out | Screen LEDs on | | 52 | PB13 | SCRN SCK | AF5 | SPI for screen | | 53 | PB14 | SCRN MISO | AF5 | | | 54 | PB15 | SCRN MOSI | AF5 | | | 15 | PC0 | ADC5 | ADC1 in 6 | Thermometers | | 16 | PC1 | ADC6 | ADC1 in 7 | (level-meter) | | 17 | PC2 | ADC7 | ADC1 in 8 | ADC channels | | 18 | PC3 | ADC8 | ADC1 in 9 | | | 33 | PC4 | - | - | External USART | | 34 | PC5 | - | - | | | 63 | PC6 | - | - | | | 64 | PC7 | - | - | | | 65 | PC8 | - | - | | | 66 | PC9 | USB PU | slow out | USB DP pullup | | 78 | PC10 | Tx | AF7 (USART3)| Ext. UART | | 79 | PC11 | Rx | AF7 | (alt.: AF5 - U4)| | 80 | PC12 | - | - | | | 7 | PC13 | - | - | | | 8 | PC14 | - | - | | | 9 | PC15 | - | - | | | 81 | PD0 | CAN Rx | AF7 (CAN) | CAN bus | | 82 | PD1 | CAN Tx | AF7 | | | 83 | PD2 | - | - | | | 84 | PD3 | - | - | | | 85 | PD4 | DE | slow out | 0-rx, 1-tx (485) | | 86 | PD5 | U2Tx | AF7 | RS-485 | | 87 | PD6 | U2Rx | AF7 | | | 88 | PD7 | - | - | | | 55 | PD8 | - | - | | | 56 | PD9 | BTN0 | slow in PU | User buttons | | 57 | PD10 | BTN1 | slow in PU | | | 58 | PD11 | BTN2 | slow in PU | | | 59 | PD12 | BTN3 | slow in PU | | | 60 | PD13 | BTN4 | slow in PU | | | 61 | PD14 | BTN5 | slow in PU | | | 62 | PD15 | BTN6 | slow in PU | | | 97 | PE0 | - | - | | | 98 | PE1 | - | - | | | 1 | PE2 | PWM0 | AF2 | TIM3 channels | | 2 | PE3 | PWM1 | AF2 | as PWM output | | 3 | PE4 | PWM2 | AF2 | | | 4 | PE5 | PWM3 | AF2 | | | 5 | PE6 | - | - | | | 38 | PE7 | - | - | | | 39 | PE8 | LED0 | slow out | External LEDs | | 40 | PE9 | LED1 | slow out | | | 41 | PE10 | LED2 | slow out | | | 42 | PE11 | LED3 | slow out | | | 43 | PE12 | - | - | | | 44 | PE13 | - | - | | | 45 | PE14 | - | - | | | 46 | PE15 | - | - | | | 12 | PF0 | OSC IN | | | | 13 | PF1 | OSC OUT | | | | 19 | PF2 | ADC9 | ADC1 in 10 | | | 73 | PF6 | - | - | | | 10 | PF9 | - | - | |

11	PF10	VadcON	slow out	turn ON ADC power

DMA usage

DMA1

Channel 1 - ADC1
Channel 4 - SPI2 Rx
Channel 5 - SPI2 Tx
Channel 6 - I2C1 Tx
Channel 7 - I2C1 Rx

DMA2

Channel 2 - ADC2