spi_half_duplex_polling_slave#
Overview#
The spi_half_duplex_polling_transfer_slave example shows how to receive and transmit data to master board.
Notice: The SPI slave of this example uses interrupt mode. The data transfer size(not buffer size) is twice of the master’s transfer size. The first half of the transmission will receive data, and the second half will send data back to master, so the address of the receive buffer is &rxDataPolling[64].
In this example, one spi instance as slave and another spi instance on the other board as master. Master sends a piece of data to slave, and receive a piece of data from slave. This example checks if the data received from master is correct. And slave will print what it received.
Supported Boards#
LPCXpresso51U68
Hardware requirements
Micro USB cable
LPCXpresso51U68 board
Personal Computer
Board settings
Populate jumper JP3. Connect SPI slave on board to SPI master on other board
Slave - SPI3
Pin Name Board Location
MISO J4 pin 3
MOSI J4 pin 2
SCK J4 pin 4
PCS2 J4 pin 7
Prepare the Demo
Connect a micro USB cable between the PC host and the CMSIS DAP USB port (J7) on the board
Open a serial terminal with the following settings (See Appendix A in Getting started guide for description how to determine serial port number):
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Reset the SoC and run the project.
Running the demo
When the demo runs successfully, the log would be seen on the CMSIS DAP terminal like:
This is slave example for SPI half-duplex polling transfer.
Slave is working....
The received data are:
0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C 0x0D 0x0E 0x0F
0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17 0x18 0x19 0x1A 0x1B 0x1C 0x1D 0x1E 0x1F
0x20 0x21 0x22 0x23 0x24 0x25 0x26 0x27 0x28 0x29 0x2A 0x2B 0x2C 0x2D 0x2E 0x2F
0x30 0x31 0x32 0x33 0x34 0x35 0x36 0x37 0x38 0x39 0x3A 0x3B 0x3C 0x3D 0x3E 0x3F
Slave transfer completed.
LPCXpresso54628
Hardware requirements
Micro USB cable
Two LPCXpresso54628 boards
Personal Computer
Board settings
SPI one board: Connect SPI master on board to SPI slave on other board
Master_board(SPI9) Slave_board(SPI9)
Pin Name Board Location Pin Name Board Location
MISO J9 pin 11 MISO J9 pin 11
MOSI J9 pin 13 MOSI J9 pin 13
SCK J9 pin 9 SCK J9 pin 9
PCS0 J9 pin 15 PCS0 J9 pin 15
GND J14 pin 5 GND J14 pin 5
Change the solder jumper JS27 to 2-3 to use P3_30 pin as SSEL or to use the Arduino connector J9 Pin 15.
##### Prepare the Demo
1. Connect a micro USB cable between the PC host and the LPC-Link USB port (J8) on the board.
2. Open a serial terminal with the following settings:
- 115200 baud rate
- 8 data bits
- No parity
- One stop bit
- No flow control
3. Download the program to the target board.
4. Reset the SoC and run the project.
##### Running the demo
When the demo runs successfully, the log would be seen on the terminal like:
This is slave example for SPI half-duplex polling transfer.
Slave is working….
The received data are: 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C 0x0D 0x0E 0x0F 0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17 0x18 0x19 0x1A 0x1B 0x1C 0x1D 0x1E 0x1F 0x20 0x21 0x22 0x23 0x24 0x25 0x26 0x27 0x28 0x29 0x2A 0x2B 0x2C 0x2D 0x2E 0x2F 0x30 0x31 0x32 0x33 0x34 0x35 0x36 0x37 0x38 0x39 0x3A 0x3B 0x3C 0x3D 0x3E 0x3F
Slave transfer completed.
LPCXpresso54S018
Hardware requirements
Micro USB cable
Two LPCXpresso54S018 boards
Personal Computer
Board settings
SPI one board: Connect SPI master on board to SPI slave on other board
Master_board(SPI9) Slave_board(SPI9)
Pin Name Board Location Pin Name Board Location
MISO J9 pin 11 MISO J9 pin 11
MOSI J9 pin 13 MOSI J9 pin 13
SCK J9 pin 9 SCK J9 pin 9
PCS0 J9 pin 15 PCS0 J9 pin 15
GND J14 pin 5 GND J14 pin 5
##### Prepare the Demo
1. Connect a micro USB cable between the PC host and the LPC-Link USB port (J8) on the board.
2. Open a serial terminal with the following settings:
- 115200 baud rate
- 8 data bits
- No parity
- One stop bit
- No flow control
3. Download the program to the target board.
4. Reset the SoC and run the project.
##### Running the demo
This demo is an external flash plain load demo, ROM will copy image in external flash to SRAMX to run:
1. Build the demo to generate a bin file.
Note: If need to generate bin file using MCUXpresso IDE, below steps need to be followed:
Set in example Properties->C/C++ Build->Settings->Build steps->Post-build steps->Edit
enbable arm-none-eabi-objcopy -v -O binary "&{BuildArtifactFileName}" "&{BuildArtifactFileBaseName}.bin"
This plainload example linked the vector table to 0x00000000, but program to external flash 0x10000000.
2. Program the bin file to external on board flash via SEGGER J-FLASH Lite(V6.22 or higher):
a. Open SEGGER J-FLASH Lite, select device LPC54S018.
b. Click the 'Erase Chip' to erase the extrenal flash.(if can not success, press SW4 button and reset the board, and try to erase again)
c. Select the bin data file, set the '.bin/Erase Start' address to 0x10000000, then click 'Program Device'
Note: Please use above way to program the binary file built by armgcc tool chain to external flash.
For IAR, KEIL, MCUXpresso IDE, you can use the IDE tool to program the external flash.
When the demo runs successfully, the log would be seen on the terminal like:
This is slave example for SPI half-duplex polling transfer.
Slave is working….
The received data are: 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C 0x0D 0x0E 0x0F 0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17 0x18 0x19 0x1A 0x1B 0x1C 0x1D 0x1E 0x1F 0x20 0x21 0x22 0x23 0x24 0x25 0x26 0x27 0x28 0x29 0x2A 0x2B 0x2C 0x2D 0x2E 0x2F 0x30 0x31 0x32 0x33 0x34 0x35 0x36 0x37 0x38 0x39 0x3A 0x3B 0x3C 0x3D 0x3E 0x3F
Slave transfer completed.
LPCXpresso54S018M
Hardware requirements
Micro USB cable
Two LPCXpresso54S018M boards
Personal Computer
Board settings
SPI one board: Connect SPI master on board to SPI slave on other board
Master_board(SPI9) Slave_board(SPI9)
Pin Name Board Location Pin Name Board Location
MISO J9 pin 11 MISO J9 pin 11
MOSI J9 pin 13 MOSI J9 pin 13
SCK J9 pin 9 SCK J9 pin 9
PCS0 J9 pin 15 PCS0 J9 pin 15
GND J14 pin 5 GND J14 pin 5
##### Prepare the Demo
1. Connect a micro USB cable between the PC host and the LPC-Link USB port (J8) on the board.
2. Open a serial terminal with the following settings:
- 115200 baud rate
- 8 data bits
- No parity
- One stop bit
- No flow control
3. Download the program to the target board.
4. Reset the SoC and run the project.
##### Running the demo
This demo is an external flash plain load demo, ROM will copy image in external flash to SRAMX to run:
1. Build the demo to generate a bin file.
Note: If need to generate bin file using MCUXpresso IDE, below steps need to be followed:
Set in example Properties->C/C++ Build->Settings->Build steps->Post-build steps->Edit
enbable arm-none-eabi-objcopy -v -O binary "&{BuildArtifactFileName}" "&{BuildArtifactFileBaseName}.bin"
This plainload example linked the vector table to 0x00000000, but program to external flash 0x10000000.
2. Program the bin file to external on board flash via SEGGER J-FLASH Lite(V6.22 or higher):
a. Open SEGGER J-FLASH Lite, select device LPC54S018M.
b. Click the 'Erase Chip' to erase the extrenal flash.(if can not success, press SW4 button and reset the board, and try to erase again)
c. Select the bin data file, set the '.bin/Erase Start' address to 0x10000000, then click 'Program Device'
Note: Please use above way to program the binary file built by armgcc tool chain to external flash.
For IAR, KEIL, MCUXpresso IDE, you can use the IDE tool to program the external flash.
When the demo runs successfully, the log would be seen on the terminal like:
This is slave example for SPI half-duplex polling transfer.
Slave is working….
The received data are: 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C 0x0D 0x0E 0x0F 0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17 0x18 0x19 0x1A 0x1B 0x1C 0x1D 0x1E 0x1F 0x20 0x21 0x22 0x23 0x24 0x25 0x26 0x27 0x28 0x29 0x2A 0x2B 0x2C 0x2D 0x2E 0x2F 0x30 0x31 0x32 0x33 0x34 0x35 0x36 0x37 0x38 0x39 0x3A 0x3B 0x3C 0x3D 0x3E 0x3F
Slave transfer completed.