hello everyone i am working on stm32h103 board and i load the programs with KEIL.when i was programming , the KEIL returns to me "no cortex-m device found in the jtag chain. please check the jtag cable and the connected device" and in the message box , it returns to me "JLink Info: Could not measure total IR len. TDO is constant high. **JLink Warning: No matching core found. Selecting default core (ARM7). * JLink Info: Could not measure total IR len. TDO is constant high. ***JLink Error: Could not find supported CPU core on JTAG chain" please help to find the trouble.
my problem is solved. the problem was unconnected VDDA to 3.3v thanx
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