Overview
========
The lpspi_interrupt example shows how to use LPSPI driver in interrupt way:
In this example , one lpspi instance used as LPSPI master and another lpspi instance used as LPSPI slave.
1. LPSPI master send/received data to/from LPSPI slave in interrupt . (LPSPI Slave using interrupt to receive/send the data)
The example supports board to board connection.
With board to board connection, one LPSPI instance on one board is used as LPSPI master and the LPSPI instance on other board is used as LPSPI slave. Tasks are created to run on each board to handle LPSPI communication.
File freertos_lpspi.c should have following definitions:
#define EXAMPLE_CONNECT_SPI BOARD_TO_BOARD
For board used as LPSPI master:
#define SPI_MASTER_SLAVE isMASTER
For board used as LPSPI slave:
#define SPI_MASTER_SLAVE isSLAVE
Toolchain supported
===================
- IAR embedded Workbench 9.30.1
- Keil MDK 5.37
- GCC ARM Embedded 10.3.1
- MCUXpresso 11.6.0
Board settings
==============
LPSPI:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
MASTER connect to SLAVE
Pin Name Board Location Pin Name Board Location
SOUT J18-6 SIN J19-5
SIN J18-5 SOUT J19-4
SCK J18-3 SCK J19-6
PCS0 J18-4 PCS0 J19-3
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Prepare the Demo
================
1. Connect a mini USB cable between the PC host and the OpenSDA USB port on the board.
2. Open a serial terminal on PC for OpenSDA serial device with these settings:
- 115200 baud rate
- 8 data bits
- No parity
- One stop bit
- No flow control
3. Download the program to the target board.
4. Either press the reset button on your board or launch the debugger in your IDE to begin running
the demo.
Running the demo
================
The following message shows in the terminal if the example runs successfully.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
FreeRTOS LPSPI example start.
This example use one lpspi instance as master and another as slave on a single board.
Master and slave are both use interrupt way.
Please make sure you make the correct line connection. Basically, the connection is:
LPSPI_master -- LPSPI_slave
CLK -- CLK
PCS0 -- PCS0
SOUT -- SIN
SIN -- SOUT
LPSPI master transfer completed successfully.
LPSPI slave transfer completed successfully.
LPSPI transfer all data matched !
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Note:
To debug in qspiflash, following steps are needed:
1. Select the flash target and compile.
2. Set the SW8: 1 off 2 off 3 on 4 off, then power on the board and connect USB cable to J23.
3. Start debugging in IDE.
- Keil: Click "Download (F8)" to program the image to qspiflash first then clicking "Start/Stop Debug Session (Ctrl+F5)" to start debugging.
