OpenJTAG

OpenJTAG is a USB-driven JTAG interface.

For brochures, please refer to this page. For software download, please refer to this page. For example programs, please refer to this page.

OpenJTAG as an in-circuit debugger hardware, supports Beyond BA12 processor, OpenRISC and its compatible cores. OpenJTAG works with OpenIDEA, which is OpenRISC software development studio.

OpenJTAG package includes API to control JTAG signals, which includes initialization, bit-wise control, bit-sequence control and so on. The API works with Visual Studio 6.0 and GNU GCC. The API enables designers to develop his/her own JTAG control program.

The following program code demonstrates how to retrieve JTAG IDCODE.

#include <stdio.h>
#include "open_jtag.h"
int main(int argc, char* argv[]) {
   unsigned int tdo;
   if (oj_init(0)) return(1);
   oj_cycle(5, 0xFFFFFFFF, 0x1F, 0x0, &tdo);
   oj_cycle(4, 0xFFFFFFFF, 0x02, 0x0, &tdo);
   oj_cycle(32, 0xFFFFFFFF, 0x00, 0xFF, &tdo);
   printf("IDCODE: 0x%x\n", tdo);
   oj_close();
   return(0);
}

OpenJTAG package includes debugger server launching GUI, through which GDB server is supported for Beyond BA12 processor.

OpenJTAG package includes debugger server launching GUI, through which GDB server is supported for Opencores OR1200 processor.