AM2432: EQEP - strobe latch configuration

Ariel Ronen

Part Number: AM2432

Tool/software:

I'm having some troubles with the configuration of the strobe latch with EQEP_setLatchMode.

EQEP_getStrobePositionLatch returns new values on both rising and falling edges for both clock-wise and counter clock-wise

1. One of my modules fully configures the EQEP module.

2. During run time - I want to use EQEP_setLatchMode to control the strobe latch mode.

3. No matter which flag I pass - there is no change.

My project is using the following SDK: ind_comms_sdk_am243x_09_01_00_03

11 months ago

0 Paula Carrillo 11 months ago

TI__Mastermind 39080 points

Hi Ariel, if you can send us snipped code it might be helpful

Few things to double check

- If you're using an interrupt to trigger the latch, make sure the interrupt is being properly triggered and serviced. You can use EQEP_getInterruptStatus()

- Also, you can use EQEP_getStatus() to check status register.

More details:

AM243x MCU+ SDK: EQEP (ti.com)

AM243x MCU+ SDK: APIs for EQEP (ti.com)

thank you,

Paula

0 Ariel Ronen 11 months ago in reply to Paula Carrillo

Prodigy 220 points

0 Paula Carrillo 11 months ago in reply to Ariel Ronen

TI__Mastermind 39080 points

Hi Ariel, thank you, I will work on getting a setup. Which modes have you tried? what is the output you see? Have you tried AM243x MCU+ SDK: EQEP Capture (ti.com) ? if so, does it work? can you change latch mode there?

thank you,

Paula

0 Ariel Ronen 10 months ago in reply to Paula Carrillo

Prodigy 220 points

As I recall - the API presents only 2 options for the strobe. I tried both and saw no difference in the latching method.

0 Ariel Ronen 10 months ago in reply to Ariel Ronen

Prodigy 220 points

any update?

0 Paula Carrillo 10 months ago in reply to Ariel Ronen

TI__Mastermind 39080 points

Hi Ariel, my apology for not coming to you earlier.

I tried AM243x MCU+ SDK: EQEP Capture. I tried from MCU+SDK, but same example is packaged inside Industrial SDK (C:\ti\ind_comms_sdk_am243x_09_01_00_03\mcu_plus_sdk\examples\drivers\eqep\eqep_capture).

Out of Box, this example uses

"EQEP_setLatchMode(gEqepBaseAddr, EQEP_LATCH_RISING_INDEX);"

which triggers App_eqepIntrISR() when GPIO_pinWriteHigh(gGpioBaseAddr, EQEP_I_GPIO_PIN);

When changing to EQEP_LATCH_FALLING_INDEX I see ISR triggers when EQEP_I_GPIO_PIN is low. I believe this is what you are trying to test, please correct me if I am wrong. But, if so, and you haven't, please take a look of this demo flow

thank you,

Paula

Arm-based microcontrollers

Arm-based microcontrollers forum

AM2432: EQEP - strobe latch configuration