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.

A full pinout and additional documentation is currently under development.

Pinout

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	USART2_CTS
11	PA1	UART4_RX	USART2_RTS
12	PA2	LPUART1_TX	USART2_TX
13	PA3	LPUART1_RX	USART2_RX
14	PA4	USART2_CK
15	PA5
16	PA6	LPUART1_CTS	USART3_CTS
17	PA7
18	PB0	LED1	USART3_CK
19	PB1	LED2	LPUART1_RTS	USART3_RTS
20	PB2
21	PB10	LPUART1_RX	USART3_TX
22	PB11	LPUART1_TX	USART3_RX
23	VSS
24	VDD
25	PB12	USART3_CK	LPUART1_RTS
26	PB13	USART3_CTS	LPUART1_CTS
27	PB14	USART3_RTS
28	PB15
29	PA8	USART1_CK
30	PA9	USART1_TX
31	PA10	USART1_RX
32	PA11	USART1_CTS	USB_DM
33	PA12	USART1_RTS	USB_DP
34	PA13	JTMS	SWDIO	USB_NOE
35	VSS_2
36	VDD_2
37	PA14	JTCK	SWCLK
38	PA15	JTDI	USART2_RX	USART3_RTS	UART4_RTS
39	PB3	JTDO	TRACESWO	USART1_RTS
40	PB4	NJTRST	USART1_CTS	UART5_RTS
41	PB5	USART1_CK	UART5_CTS
42	PB6	USART1_TX
43	PB7	USART1_RX	UART4_CTS
44	PH3	BOOT0
45	PB8
46	PB9
47	VSS_3
48	VDD_3