Gnu gcc for SH7045F EVB from Hitachi

Gnu gcc for SH7045F EVB from Hitachi

[John O'Connor]

Hello,

I am working with Hitachi SH7045F EVB, HDI-M and Gnu C Compiler toolchain. 
Is anyone working with this or similar system and willing to share 
advice/info?

I am attempting to get a simple interrupt service routine up and running, 
using the WDT Interval Timer Mode Overflow interrupt to flash the green User 
LED via PortE, bit 5, but it is not working properly. I think my problem may 
revolve around fact that HDI-M, when loaded into Flash on the SH7045F, 
displaces the Exception Processing Vector table from VBR = 0x00000000 to VBR 
= 0x00400000, yet the VBR remains as 0x00000000 in the Register window.

Does HDI-M look after this displacement 'automatically', or must the user 
copy the vectors used by the HDI-M to correct positions in the relocated 
table at VBR = 0x00400000, locate the WDT Interval Timer Mode overflow 
vector at location 0x00400260, correct offset from VBR = 0x00400000, and 
then set VBR = 0x00400000?

I have tried writing a fragment of assembly to write 0x00400000 to VBR, but 
Gnu C compiler does not seem to accept VBR as a valid operand of the 
appropriate assembly language instructions, even though VBR is explicitly 
stated as a valid operand for the instructions in the SH Assembly Language 
Programming Manual.

Can anyone help?, please?

Regards,

John O'Connor




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