Hi, i Design a board with LPC4357, and i Program it. after about 30times programing i have a error in programing!!! Keil unknown my programmer!! i use ulink2 and keil Version4.72 now when i want program my board ,i get this error: in jtag mode: Jtag communication failure in SW mode: SWD communication failure
any body can offer me?
thank you in advance
Did you load any application code which may have modified the pins or powered down the device?
Is there any mechanism to jumper the device to erase or enter a ROM Loader mode?
Thanks Westonsupermare Pier for answer. I don't know that i modified wrong pins or mode! think last code that program on board it's, you can download from here: www.mediafire.com/.../Test_Program.zip
i don't have any mechanism that easily i can erase the chip! but i soldered three pull-down resistors on P1.1,P1.2,P2.8 and a pull-up resistor on P2.9, and P2.7 ,reset pins was pull-uped. and use this circuit : www.mediafire.com/.../program.jpg i want use USART3 and flash magic tool for erasing the chip! but flash magic cann't connect to my board!!