CCS/TPS65381A-Q1: I can't modify the bit IGN_PWRL value of the register WR_SAFETY_FUNC_CFG in the diagnostic state

user5867093

Part Number: TPS65381A-Q1

Tool/software: Code Composer Studio

During MCU initialization, I set the register WR_SAFETY_CHECK_CTRL value to 0x17. I read the register RD_SAFETY_STAT_5 value as 0x07,

and then I set the register WR_SAFETY_FUNC_CFG value to 0x95, but I read the register RD_SAFETY_FUNC_CFG value as 0x85,and I failed to modify the bit IGN_PWRL value.

and then I set the register WR_DEV_CFG2 value to 0xD0, and I read the register RD_DEV_CFG2 value as 0xD0,and I successfully modified the bit POST_RUN_RST value.

How can I change the bit IGN_PWRL value?

thanks!

over 5 years ago

0 Ivan Calzada over 5 years ago

TI__Expert 4690 points

Hi,

I did a quick test of toggling IGN_PWRL on our EVM while the device is in DIAGNOSTIC state and was able to confirm the bit can be toggled using 7-bit hex command code (without parity). Are you using the same parity option?

In my case these were the commands used to write/read IGN_PWRL:

Writing Safety Functional Config Register to set IGN_PWRL
WR_SAFETY_FUNC_CFG value to 0x95 (0x1a ; 0x95)

Read Functional Config Register
RD_SAFETY_FUNC_CFG (0x1d)

Writing Safety Functional Config Register
WR_SAFETY_FUNC_CFG value to 0x85 (0x1a ; 0x85)

Updating Functional Config Register
RD_SAFETY_FUNC_CFG (0x1d)

0 user5867093 over 5 years ago in reply to Ivan Calzada

Prodigy 20 points

Thank you for your reply!

My function is right. The bit IGN_PWRL can't be written because the wake-up event of CANWU has occurred.

It is explained in the data manual 5.3.7: The IGN_PWRL bit is also cleared after a detected CANWU wake-up event

Power management

Power management forum

CCS/TPS65381A-Q1: I can't modify the bit IGN_PWRL value of the register WR_SAFETY_FUNC_CFG in the diagnostic state