problem with USART bootloader programming STM32F407

developer2 · ‎2013-06-28

Posted on June 28, 2013 at 21:47

Hi all,

please could you help me to identify changes in communication using serial port and STM32 bootloader,

i'm able to program STM32F103 with version 2.2 chip ID 414 but i can't program STM32F407 with bootloader version 3.1 chip ID 413,

i'm getting NACK on command 0x73 - write unprotect :(

what should i change to get ACK ?

there are no Flash or Read-out protections activated,

Kind regards,

Tesla DeLorean · ‎2013-06-28

Posted on June 28, 2013 at 22:11

Does the boot loader report that it supports that command?

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developer2 · ‎2013-06-28

Posted on June 28, 2013 at 22:18

well, i don't have any debug device, is there a way how to find it ?

developer2 · ‎2013-06-28

Posted on June 28, 2013 at 22:54

so i made some debugs and i found that command Write Unprotect is successful , but Init command 0x7f was executed too early after ACKs for WriteUnprotect,

so i delayed the Init command and it's successful,

but when send Erase command 0x43 i get ACK and after parameters 0xff 0x00 i get NACK ,

developer2 · ‎2013-06-29

Posted on June 29, 2013 at 11:11

solved .... i had to read ''small text'' in doc, Erase cmd is not supported in bootloader ver >=3.0, only extended erase,

Thank You Clive1

Kind regards,