programming interrupt on omap l137

Francesco Danilo De Vita

Hello!

I have problems to program interrupt on arm of omap L137. I have read on arm manual that the exception vector is placed at the address 0xffff0000 only if the signal VINITHI ( or VINTH) is high. But where is this pin in the omap L137?

over 13 years ago

0 Jakez over 13 years ago

Expert 1950 points

Hello,

You may find information in sprug84c.pdf, ARM subsystem, p24

0 Francesco Danilo De Vita over 13 years ago in reply to Jakez

Intellectual 255 points

I've seen that manual but nothing is written about hot to set the VINTH signal. This signal is not present in the pinout of the omap datasheet!

0 Francesco Danilo De Vita over 13 years ago in reply to Jakez

Intellectual 255 points

I've seen that manual at 24 pge but nothing is written about how to set the VINTH signal. This signal is not present in the pinout of omap_l137 datasheet

0 Jakez over 13 years ago in reply to Francesco Danilo De Vita

Expert 1950 points

Hello,

From the manual:

"The ARM is configured with the VINTH signal set high (VINTH = 1), such that the vector table is located at address FFFF 0000h. This address maps to the beginning of the ARM local RAM (8 KB). The VINTH signal is configurable by way of the register setting in CP15. However, it is not recommended to set VINTH = 0, as the device has no physical memory in the 0000 0000h address region."

This means for me that the "VINTH pin" of the ARM core is internally connected to 1 (no physical pin), so that the V bit of CP15 register c1 is 1 at reset (and should not be modified).

Regards

0 Francesco Danilo De Vita over 13 years ago in reply to Jakez

Intellectual 255 points

thanks!

Regards

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programming interrupt on omap l137