IWDT S7G2 + iar + SSP1.5.2

Question

Hello, 
 I need your help. 
 I used thread monitor with WDT : working fine. 
 Now i wanted to move to IWDT : BIG ISSUE there is no reset, it seems that the timer doesn't work. 
 
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 With WDT 
 R_DBG->DBGSTOPCR_b.DSWDT = 0; g_wdt0.p_api->open(g_wdt0.p_ctrl,g_wdt0.p_cfg); while(1); 
 The mcu reset -> working 
 -------------------------------------------------------------------------------------- 
 With IWDT 
 R_DBG->DBGSTOPCR_b.DSIWDT = 0; g_wdt1.p_api->open(g_wdt1.p_ctrl,g_wdt1.p_cfg); while(1); 
 The mcu DOES NOT reset-> PLEASE HELP 
 -------------------------------------------------------------------------------------- 
 I tried for a day without success 
 
 Thanks for your help

Jeremy · Accepted Answer

In that case the bootloader would have to start the iWDT as it is programmed into the flash area that starts the iWDT. The application cannot start the iWDT as it is at a higher address. 
 
The OFS registers are in Flash at addresses 0x0000 0400 and 0x0000 0404, these are in the first 8KB block of flash (where the bootloader is programmed), on an S5 or S7 device.

Jeremy · Answer

Yes, the bootloader would have to start the iWDT, as the OFS registers sit in the flash block that the bootloader uses. The iWDT is then running and needs to be re-freshed by whichever software is running, either the bootloader or the main application.

Jeremy · Answer

The attached project works for me, the iWDT generates a reset (with the iWDT settings you have used above) :- 
 
 S7G2_DK_IWDT_RESET.zip

Clément · Answer

Thanks, I'll try ASAP ! 
 
 Edit : That was the problem, it works like a charm now ! 
 Thank you :)