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flexio_a-format_PWM_trigger

flexio_a-format_PWM_trigger#

Overview#

The a-format_PWM_trigger example shows how to use flexio A-format driver in sync way:

In this example, a flexio simulated A-format connect to the encoder through RS-485, the board will send requests triggered by the PWM to and receive responses from the board.

Supported Boards#

FRDM-MIMXRT1186
Hardware requirements

  • USB Type-C cable

  • FRDM-IMXRT1186 board

  • 5V power supply

  • Personal Computer

  • FRDM-LVPMSM-FA board

  • 4-pin Mini DIN power supply

Board settings

This example requires connecting between FRDM-IMXRT1186 board and FRDM-LVPMSM-FA board.

  • Short J4-1 and J4-2 on the FRDM-IMXRT1186 board

  • Short J300-1 and J300-2 on the FRDM-LVPMSM-FA board

  • J72 and J73 jumpers are left unconnected on the FRDM-LVPMSM-FA board

  • FRDM-LVPMSM-FA SW90[1-4] = 0111

  • FRDM-LVPMSM-FA SW30[1-4] = 0100

  • FRDM-LVPMSM-FA J70-1 -> 5.0V pin of encoder

  • FRDM-LVPMSM-FA J70-6 -> GND pin of encoder

  • FRDM-LVPMSM-FA J70-4 -> SD+ pin of encoder

  • FRDM-LVPMSM-FA J70-9 -> SD- pin of encoder

Prepare the Demo

  1. Connect a USB Type-C cable between the PC host and the OpenSDA USB port on the FRDM-IMXRT1186 board.

  2. Connect 5V power supply, then switch SW5 to power on the FRDM-IMXRT1186 board.

  3. Connect 4-pin Mini DIN power supply to J10 on the FRDM-LVPMSM-FA board.

  4. Open a serial terminal with the following settings:

    • 115200 baud rate

    • 8 data bits

    • No parity

    • One stop bit

    • No flow control

  5. Download the program to the target board.

  6. Either re-power up your board or launch the debugger in your IDE to begin running the example.

Running the demo

When the example runs successfully, you can see the similar information from the terminal as below.

Encoder A-format example (PWM trigger)

******************** Running the loop test ********************
Multi-turn data: 64218, single-turn data: 789298
Multi-turn data: 64218, single-turn data: 784673
Multi-turn data: 64218, single-turn data: 764498
Multi-turn data: 64218, single-turn data: 754967
Multi-turn data: 64218, single-turn data: 750528
Multi-turn data: 64218, single-turn data: 745894
Multi-turn data: 64218, single-turn data: 744414
Multi-turn data: 64218, single-turn data: 743238
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