OI!STER

The OI!STER is an STM32L5 Target Board with a QFP48 clamshell socket aimed at debugging and glitching salvaged MCUs. The board can be powered via USB-C, a 2032 coin cell battery on the back of the board or an external power suppy. All pins are broken out in the 24-pin headers on either side at the top of the board. The OI!STER contains five debug headers, to support a wide range of debugging hardware such as a Hydrabus or a Black Magic Probe. It comes with six SMA connectors arranged in I/O pairs. One pair is dedicated to glitching the external LSE clock, another for glitching the external HSE clock and one pair for power analysis and fault injection with a Chipwhisperer. Each SMA connector can be bypassed by removing a small jumper. The OI!STER also has additional solder jumpers for the external clocks and each of the power traces to the MCU to allow for quick experimentation.

The Pinout diagrams below are directed at reverse engineering. The first diagram is targeted at debugging and reverse engineering an STM32L5 MCU itself. The second diagram is aimed at the communication between external peripherals and the MCU. Although some functionaly might overlap, we've found it practical to define these two pinout groups. Additional documentation is currently under development.

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Debug Pinout Diagram


Debug Pinout
Pin	Function	Alternate Function
1	VBAT
2	PC13
3	PC14	OSC32_IN
4	PC15	OSC32_OUT
5	PH0	OSC_IN
6	PH1	OSC_OUT
7	NRST
8	VSSA	VREF-
9	VDDA	VREF+
10	PA0	UART4_TX
11	PA1	UART4_RX
12	PA2	LPUART1_TX
13	PA3	LPUART1_RX
14	PA4	USART2_CK
15	PA5
16	PA6	LPUART1_CTS
17	PA7
18	PB0	LED1
19	PB1	LED2
20	PB2	UCPD1_FRSTX2
21	PB10	USART3_TX
22	PB11	USART3_RX
23	VSS
24	VDD
25	PB12	LPUART1_RTS
26	PB13	LPUART1_CTS
27	PB14	UCPD1_DB2
28	PB15	UCPD1_CC2
29	PA8	USART1_CK
30	PA9	USART1_TX
31	PA10	USART1_RX
32	PA11	USART1_CTS
33	PA12	USART1_RTS
34	PA13	JTMS
35	VSS_2
36	VDD_2
37	PA14	JTCK
38	PA15	JTDI
39	PB3	JTDO
40	PB4	NJTRST
41	PB5	UCPD1_DB1
42	PB6	USART1_TX
43	PB7	UART4_CTS
44	PH3	BOOT0
45	PB8
46	PB9
47	VSS_3
48	VDD_3

Protocol Pinout Reference


USB
Pin	Function	Description
32	USB_DM	Data -
33	USB_DP	Data +
34	USB_NOE	Output Enable


Pin	Function	Description
UCPD1
12	UCPD1_FRSTX1	Fast Role Swap Signal
20	UCPD1_FRSTX2	Fast Role Swap Signal
27	UCPD1_DB2	Dead-Battery Signal
28	UCPD1_CC2	Configuration Control Line
38	UCPD1_CC1	Configuration Control Line
41	UCPD1_DB1	Dead-Battery Signal


Pin	Function	Description
UART4
10	UART4_TX	Transmit Data
11	UART4_RX	Receive Data
38	UART4_RTS	Request To Send
43	UART4_CTS	Clear To Send


Pin		Function	Description
LPUART1
12	22	LPUART1_TX	Transmit Data
13	21	LPUART1_RX	Receive Data
16	26	LPUART1_CTS	Clear To Send
19	25	LPUART1_RTS	Request To Send


Pin		Function	Description
USART1
29	41	USART1_CK	Transmitter Clock
30	42	USART1_TX	Transmit Data
31	43	USART1_RX	Receive Data
32	40	USART1_CTS	Clear To Send
32	40	USART1_NSS	Slave Select
33	39	USART1_RTS	Request To Send
33	39	USART1_DE	Driver Enable


Pin		Function	Description
USART2
10		USART2_CTS	Clear To Send
10		USART2_NSS	Slave Select
11		USART2_RTS	Request To Send
11		USART2_DE	Driver Enable
12		USART2_TX	Transmit Data
13	38	USART2_RX	Receive Data
14		USART2_CK	Transmitter Clock


Pin			Function	Description
USART3
16	26		USART3_CTS	Clear To Send
16	26		USART3_NSS	Slave Select
18	25		USART3_CK	Transmitter Clock
19	27	38	USART3_RTS	Request To Send
21	27	38	USART3_DE	Driver Enable
21			USART3_TX	Transmit Data
22			USART3_RX	Request Data


Pin	Function	Description
JTAG
34	JTMS	Test Mode State
37	JTCK	Test Clock
38	JTDI	Test Data In
39	JTDO	Test Data Out
40	NJTRST	Reset


Pin	Function	Description
SWD
7	NRST	Reset
34	SWDIO	Data I/O
37	SWCLK	Clock
39	TRACESWO	Trace Output


Pin	Function	Description
OSC
5	OSC_IN	High Speed External Clock In (HSEI)
6	OSC_OUT	High Speed External Clock Out (HSEO)


Pin	Function	Description
OSC32
3	OSC32_IN	Low Speed External Clock In (LSEI)
4	OSC32_OUT	Low Speed External Clock Out (LSEO)

Peripheral Pinout Diagram


Pin	Function	Alternate
Peripheral Pinout
1	VBAT
2	PC13
3	PC14
4	PC15
5	PH0
6	PH1
7	NRST
8	VSSA
9	VDDA
10	PA0
11	PA1	I2C1_SMBA	SPI1_SCK
12	PA2	OCTOSPI1_NCS
13	PA3	OCTOSPI1_CLK
14	PA4	SPI1_NSS	SPI3_NSS	OCTOSPI1_NCS
15	PA5	SPI1_SCK
16	PA6	SPI1_MISO	OCTOSPI1_IO3
17	PA7	I2C3_SCL	SPI1_MOSI	OCTOSPI1_IO2
18	PB0	SPI1_NSS	OCTOSPI1_IO1
19	PB1	OCTOSPI1_IO0
20	PB2	I2C3_SMBA
21	PB10	I2C2_SCL	I2C4_SCL	SPI2_SCK	OCTOSPI1_CLK
22	PB11	I2C2_SDA	I2C4_SDA	OCTOSPI1_NCS
23	VSS
24	VDD
25	PB12	I2C2_SMBA	SPI2_NSS	OCTOSPI_NCLK
26	PB13	I2C2_SCL	SPI2_SCK
27	PB14	I2C2_SDA	SPI2_MISO
28	PB15	SPI2_MOSI
29	PA8
30	PA9	SPI2_SCK
31	PA10
32	PA11	SPI1_MISO	FDCAN1_RX
33	PA12	SPI1_MOSI	FDCAN1_TX
34	PA13
35	VSS_2
36	VDD_2
37	PA14	I2C1_SMBA	I2C4_SMBA
38	PA15	SPI1_NSS	SPI3_NSS
39	PB3	SPI1_SCK	SPI3_SCK
40	PB4	I2C3_SDA	SPI1_MISO	SPI3_MISO
41	PB5	I2C1_SMBA	SPI1_MOSI	SPI3_MOSI
42	PB6	I2C2_SCL	I2C4_SCL
43	PB7	I2C1_SDA	I2C4_SDA
44	PH3
45	PB8	I2C1_SCL	FDCAN1_RX
46	PB9	I2C1_SDA	SPI2_NSS	FDCAN1_TX
47	VSS_3
48	VDD_3

Protocol Pinout Reference


Pin		Function	Description
I2C1
11	41	I2C1_SMBA	System Management Bus Alert (SMBus mode)
43	46	I2C1_SDA	Serial Data Line
42	45	I2C1_SCL	Serial Clock Line


Pin		Function	Description
I2C2
21	26	I2C2_SCL	Serial Clock Line
22	27	I2C2_SDA	Serial Data Line
25		I2C2_SMBA	System Management Bus Alert (SMBus mode)


Pin	Function	Description
I2C3
17	I2C3_SCL	Serial Clock Line
25	I2C3_SMBA	System Management Bus Alert (SMBus mode)
40	I2C3_SDA	Serial Data Line


Pin		Function	Description
I2C4
21	42	I2C4_SCL	Serial Clock Line
22	43	I2C4_SDA	Serial Data Line
37		I2C4_SMBA	System Management Bus Alert (SMBus mode)


Pin			Function	Description
SPI1
11	15	39	SPI1_SCK	Serial Clock
14	18	38	SPI1_NSS	Slave Select
16	32	40	SPI1_MISO	Master-in, Slave-out
17	33	41	SPI1_MOSI	Master-out, Slave-in


Pin		Function	Description
SPI2
21	26	SPI2_SCK	Serial Clock
25		SPI2_NSS	Slave Select
27		SPI2_MISO	Master-in, Slave-out
28		SPI2_MOSI	Master-out, Slave-in


Pin		Function	Description
SPI3
14	38	SPI3_NSS	Slave Select
39		SPI3_SCK	Serial Clock
40		SPI3_MISO	Master-in, Slave-out
41		SPI3_MOSI	Master-out, Slave-in


Pin		Function	Description
OCTOSPI1
12	14	OCTOSPI1_NCS	Chip Select
13	21	OCTOSPI1_CLK	Clock
16		OCTOSPI1_IO3	I/O Data Line
17		OCTOSPI1_IO2	I/O Data Line
18		OCTOSPI1_IO1	I/O Data Line


Pin		Function	Description
FDCAN
32	45	FDCAN_RX	Receive Data
33	46	FDCAN_TX	Transmit Data