DAP-Link (CMSIS-DAP) Fireware for JLink-OB Hardware

Note: The JLink-OB hardware base on STM32F103C8T6.

• MCU: STM32F103C8
• Debug Interface: SWD (TMS, TCK, nRESET, GND)
• No Support JTAG interface mode
• No Support SWO UART
• No Support Virtual UART

SWD PIN

Note: Because of only support SWD mode, so JTAG's TDI, TDO, nTRST pins are unused.

SWD Interface	STM32F103C8 Pin
SWDIO/TMS	PA4
SWCLK/TCK	PA3
nRESET	PA2
GND	GND
5V or 3.3V (optional)	5V or 3.3V

JTAG PIN

Note: If need support JTAG interface mode, only edit MAIN/DAP_config.h file:

/// Indicate that JTAG communication mode is available at the Debug Port.
/// This information is returned by the command \ref DAP_Info as part of <b>Capabilities</b>.
#define DAP_JTAG   0    ///< JTAG Mode: 1 = available, 0 = not available.

JTAG Interface	STM32F103C8 Pin
TMS	PA4
TCK	PA3
nRESET	PA2
nTRST	PA8
TDO	PA6
TDI	PB0
GND	GND
5V	5V
3.3V	3.3V

Support NXP MCUXproessIDE

For support MCUXproessIDE, the USB VID, PID and PRODUCT STRING must be modifed:

// usbd_desc.c

#define USBD_LANGID_STRING              0x0409
#define USBD_VID                        0x0D28
#define USBD_PID_FS                     0x0204
#define USBD_PRODUCT_STRING_FS          "JLinkOB CMSIS-DAP"

and also need to modify the probetable.csv file, it localed at MCUXpressoIDE_intalled_dir\ide\plugins\com.nxp.mcuxpresso.tools.bin.win32_11.5.1.202204071413\binaries\Scripts:

// probetable.csv

0x0D28, 0x0019, 64, 1, 0, 0, 0, "", 0x0000, -1, -1
//0x0D28, 0x0204, 64, 1, 0, 0, 0, "", 0x0000, -1, -1
0x0D28, 0x0204, 64, 1, 1, 0, 0, "", 0x0000, 3, -1

as above, we must add a be commented new entry to above at VID and PID is 0x0D28, 0x0204 line, then the MCUXproessIDE can identify the our custom CMSIS-Link.