Posted on December 17, 2007 at 05:08Hi,
I'm programming an ST7 µC and i have to realize a bootloader thanks to IAP driver. But, i meet an odd problem during the call of HDFlashEraseSector(). Actually, i never leave this routine and i can observe a crash of my micro after 1s to 1.5s, following by a reboot.
To define the context:
- Routines of IAP driver are in the sector 0 into the flash and also the different initializations which needed, like SCI communication.
- Vpp and Vdd voltage are in the the well range
- Watchdog is disabled
- I don't have problems to erase sector 1 before erasing sector 2
- Thanks to a scope, during the execution of HDFlashEraseSector(), i noticed that the Vpp voltage switch off when the ST7 crash appears. But, i didn't observe a reset due to LVD.
Can you help me to understand reasons of such behaviour? Have you any suggestions?
Below, a part of my code to erase HDflash sector:
Code:
<BR>RASS_Disable(0x56,0xAE); <BR>Vpp_Enable(); <BR> <BR>//erasing sector 1 <BR>if (HDFlashEraseSector(1,8) != 3) <BR>{ <BR> aff_string(erreur); <BR>} <BR> <BR>// Check the stack: No problem->SP = 0x1F7 <BR>asm <BR>{ <BR> LD A, S; <BR> LD Nombre_octet, A; <BR>} <BR>sci_Send_Byte_Boot(Nombre_octet); <BR>//--// <BR> <BR>//erasing sector 2 <BR>if (HDFlashEraseSector(2,8) != 3) // Here, i never leave this routine and there is a reboot <BR>{ <BR> aff_string(erreur); <BR>} <BR> <BR>//--// <BR>sci_Send_Byte_Boot(0xB8); <BR>//--// <BR> <BR>//Vpp_Disable(); <BR>
If you need others informations, don't hesitate to ask me!
Thanks. ;)
Nicolas
[ This message was edited by: nicolas_homeostasie on 19-12-2007 10:45 ]
