ECAP mode how to synchronize TSCTRs for ECAP1 to 3

Hitoshi Sugawara

Mastermind 20200 points

Part Number: TMS320F280049

Hi Champs,

Could you please let me know how to synchronize ECAP1 to ECAP3 TSCTRs in CAP mode?
A customer followed "19.5.6.1 Example 1 - Using SWSYNC with ECAP Module" however, they confirmed not synchronized TSCTRs.

ECap1Regs
TSCTR 0x26EB34B5
ECap2Regs
TSCTR 0x26EB34B3
ECap3Regs
TSCTR 0x26EB34B1

Procedure:
1) ECAP [1..3] .ECCTL2.SYNCI_EN = 0x0
2) ECAP [1..3] .ECCTL2.SWSYNC = 0x1
3) ECAP [1..3] .ECCTL2.SYNCO_SEL = 0x0
4) ECAP [2..3] .ECCTL2.SWSYNC = 0x0
5) SYNCSEL [ECAP1SYNCIN] = 0x5
6) ECAP1.ECCTL2.SWSYNC = 0x1

Could you please check the correct procedure to synchronize ECAP1 to 3?

Also, could you please let us know how to check the TSCTR value by break, etc. in order to confirm they are synchronized?

Thank you for your support.
Best regards,
Hitoshi

over 4 years ago

0 Frank Ankapong over 4 years ago

TI__Mastermind 28275 points

Hi Hitoshi,

Looking at the code snippet you have above, ECAP [1..3].ECCTL2.SYNCI_EN = 0x0 means sync is disabled. Can you set it to 1?

To properly test that the sync is working, you will need to configure Ecaps1..3 to capture the same event. You can't read TSCTR for all 3 Ecaps in software in order to determine if they are synchronized.

0 Hitoshi Sugawara over 4 years ago in reply to Frank Ankapong

TI__Mastermind 20200 points

Hi Frank,

Thank you for your kind check.
Let me convey it to the customer.
Regarding to check the TSCTR, ask the customer to capture the same event for ECAP1 to 3.

Best regards,
Hitoshi

C2000™︎ microcontrollers

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ECAP mode how to synchronize TSCTRs for ECAP1 to 3