stm32f103 arm microcontroller doesn't program twice

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amintlk

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hi to all
i have stm32f103RB and i make program with STMCUBEMX and IAR .. the program is for test and it is led blinker . after i program it for first time it's Ok but it doesn't program again .. the stm is running correctly but i can't program it again .. it happen for 2 micro and i use both SWD and JTAG method .. and microcontroller pins are used are not same with programming pin ..
what's wrong with that?
 

There are two possible reasons:
1. Connection or h/w issue. Have no idea how you connected target board to debugger and how supplied.
2. You switched off both JTAG and SWD in s/w. In this case you can start mcu in boot0 mode (boot0 pin set high and reset). And then erase it.
 

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the stm is running correctly but i can't program it again
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There are some option bytes for the STM micro. Search in there for a write protection bit, in combination with the Global Read Out Protection (RDP) level. Check your program's configuration for those option bytes.
 

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thanks for your help .. i can program when i set boot0 pin .
i think flash write protection is enable but how i could disable it ?
 


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