i.MX Processors中的主题 SNVS

SNVS

iysheng — Wed, 18 May 2022 00:47:27 GMT

I want to use these pins as gpio,

After set the fuse register value with is 0b11 as below.

I still could not set these pins with ALT5 mode. After I write value 0x05 to these register, then i found theses registers sitll 0x00.

I want to know is there some others reigsters should be set ?

joanxie — Wed, 18 May 2022 01:33:01 GMT

what chip are you talking about?

iysheng — Wed, 18 May 2022 01:42:23 GMT

Oh, I'm sorry, the chip I use is i.MX6ULL.

joanxie — Sat, 21 May 2022 07:55:55 GMT

pls refer to the link as below:

The definition of TAMPER_PIN_DISABLE[1:0] are

00 - enabled, TAMPER0-9 used as TAMPER detection pins.

01 - disabled TAMPER2-4 and TAMPER7-9 used as GPIO.

10 - disabled TAMPER0-1 and TAMPER5-6 used as GPIO.

11 - disabled TAMPER0-9 used as GPIO.

The u-boot command to read TAMPER_PIN_DISABLE is

=> fuse read 0 3

If bit [21:20] is 11, then all the ten tamper pins are programmed to GPIO mode.