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flexio_biss_polling_transfer

flexio_biss_polling_transfer#

Overview#

The flexio_biss_polling example shows how to use flexio BiSS driver in polling way:

In this example, a flexio simulated BiSS connect to the encoder through RS-485, the board will send requests 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

Board settings

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

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

  • FRDM-LVPMSM-FA SW90[1-4] = 1001

  • FRDM-LVPMSM-FA SW30[1-4] = 0100

  • FRDM-LVPMSM-FA J70-1 -> VCC pin of encoder

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

  • FRDM-LVPMSM-FA J70-2 -> CLK+ pin of encoder

  • FRDM-LVPMSM-FA J70-7 -> CLK- pin of encoder

  • FRDM-LVPMSM-FA J70-3 -> Data+ pin of encoder

  • FRDM-LVPMSM-FA J70-8 -> Data- 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. Open a serial terminal with the following settings:

    • 115200 baud rate

    • 8 data bits

    • No parity

    • One stop bit

    • No flow control

  4. Download the program to the target board.

  5. 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 BiSS example
FlexIO Root Clock is 80 MHz
The initial frame format:
head=4; mt=12; st=16; erWr=2; crc=6; stop=1; cdm=4; data=30; total=41; whole=45
CDM Value = FFFFFFFFFC02AAAA
[OK] Shifer1 = 0xB7100BD0; Shifter0 = 0x00001C50
head=8; mt=12; st=16; erWr=2; crc=6; stop=1; cdm=4; data=30; total=45; whole=49

##### ******************** Running the loop test ********************
[OK] Shifer1 = 0x7100BD00; Shifter0 = 0x0001C50B
  CRC     = 0x28; CRC_Cal = 0x28
  head    = 0xE2
  CRCdata = 0x216E2017
  ST      = 0x00008805
##### MT      = 0x085B
[OK] Shifer1 = 0x7100BD00; Shifter0 = 0x0001C50B
  CRC     = 0x28; CRC_Cal = 0x28
  head    = 0xE2
  CRCdata = 0x216E2017
  ST      = 0x00008805
  MT      = 0x085B
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