BQ32002: RTC read using I2C(MSP430F6779A) and transmit to the UART- how to set time

Priyadharshini M

Part Number: BQ32002
Other Parts Discussed in Thread: MSP430F6779A,

Hi Team,

Good wishes to you. I'm working on RTC BQ32002 in my custom board(Using Microcontroller MSP430F6779A).I need to read RTCBQ32002 from micro controller MSP430F6779A Seconds and minutes only varries when i set time like {sec, min,hours,day,date,month,year} other values are doesn't change.

For example,

Given time is ,

uint8_t MasterType0 [TYPE_0_LENGTH] = { 50, 58, 11, 6, 28, 4, 23}; // {28/04/2023 11:58:50 am}

I got output like,

In this above image sec and min only change.

Please tell me what mistake i did and how to set time in correct way( also I refered BQ32002 data sheet)

Thanks in advance,

Regards,

Priyadharshini

over 2 years ago

0 Evan Su over 2 years ago

TI__Genius 14770 points

Hi Priyadharshini,

We have paged a device expert to assist you by next week.

Best,

Evan Su

0 Priyadharshini M over 2 years ago in reply to Evan Su

Prodigy 210 points

Hi Evan Su,

Thank you for your response.

I have one more doubt here. I'm successfully writing and reading Time using RTC BQ32002. But my doubt is that 0s, 0min, and 0hrs do not come, and secs and min values are only between 1-59.

Please tell me how to get 0-59 (sec and min) or ttell why I get 1-59.

Given data in write function - uint8_t MasterType0 [TYPE_0_LENGTH] = { 85, 88, 35, 1, 49, 18, 35}; // {31/12/2023 23:58:55 }

Thanks & Regards,

Priyadharshini.

0 Noel Fung over 2 years ago in reply to Priyadharshini M

TI__Guru* 98370 points

Hi Priyadharshini,

Our team is not familiar with the MCU programming of the RTC, I sorted out some old E2E posts that are regarding programming, hopefully they can give you some insight. If not, maybe you can make a post to the Microcontroller forum for help.

https://e2e.ti.com/support/clock-timing-group/clock-and-timing/f/clock-timing-forum/725499/bq32002-i2c_read-not-giving-expected-value?tisearch=e2e-sitesearch&keymatch=bq32002#
https://e2e.ti.com/support/microcontrollers/msp-low-power-microcontrollers-group/msp430/f/msp-low-power-microcontroller-forum/474474/msp430g2433-i2c-code-for-bq32002?tisearch=e2e-sitesearch&keymatch=bq32002#
https://e2e.ti.com/support/clock-timing-group/clock-and-timing/f/clock-timing-forum/923284/bq32002-programming-registers?tisearch=e2e-sitesearch&keymatch=bq32002#

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BQ32002: RTC read using I2C(MSP430F6779A) and transmit to the UART- how to set time