MCSPI External Loopback

Table of Contents

• Introduction
• Supported Combinations
• Steps to Run the Example
• See Also
• Sample Output

Introduction

This example demonstrates the McSPI RX and TX operation configured in blocking, interrupt mode of operation with External loopback connection of 2 McSPI instances controlled by different cores - one in controller and other in peripheral mode

This example sends a known data in the TX mode of length APP_MCSPI_MSGSIZE and then receives the same in RX mode.

When transfer is completed, TX and RX buffer data are compared. If data is matched, test result is passed otherwise failed.

Supported Combinations

Parameter	Value
CPU + OS	r5fss0-0 freertos
	r5fss0-1 nortos
Toolchain	ti-arm-clang
Boards	am261x-som, am261x-lp
Example folder	examples/drivers/mcspi/mcspi_external_loopback

Steps to Run the Example

• When using CCS projects to build, import the CCS project for the required combination and build it using the CCS project menu (see Using SDK with CCS Projects).
• When using makefiles to build, note the required combination and build using make command (see Using SDK with Makefiles)
• Make below external loopback connections between two SPI instances:
  • AM261x LP
    • MCU_SPI0_CS0 (J2/J4 Pin 19) (B13) -> MCU_SPI2_CS1 (J5/J7 Pin 59) A18
      
    • MCU_SPI0_CLK (J6/J8 Pin 7) (T2) -> MCU_SPI2_CLK (J6/J8 Pin 47) D17
    • MCU_SPI0_D0 (J6/J8 Pin 15) (T1) -> MCU_SPI2_D1 (J6/J8 Pin 54) B18
    • MCU_SPI0_D1 (J6/J8 Pin 14) (U1) -> MCU_SPI2_D0 (J6/J8 Pin 55) A16
  • AM261x SOM and AM263x HSEC Board
    • MCU_SPI0_CS0 (C11) -> HSEC_LIN3_RXD (J20-12) -> MCU_SPI1_CS0 (C9) -> HSEC_SPI1_CS0 (J20-16)
    • MCU_SPI0_CLK (A11) -> HSEC_LIN3_TXD (J20-11) -> MCU_SPI1_CLK (A10) -> HSEC_SPI1_CLK (J20-15)
    • MCU_SPI0_D0 (C10) -> HSEC_SPI0_D1 (J20-10) -> MCU_SPI1_D1 (D9) -> HSEC_SPI1_D1 (J20-14)
    • MCU_SPI0_D1 (B11) -> HSEC_SPI0_D0 (J20-9) -> MCU_SPI1_D0 (B10) -> HSEC_SPI1_D0 (J20-13)
  • AM261x SOM and C2000 HSEC Board
    • MCU_SPI0_CS0 (C11) -> HSEC PIN (73) -> MCU_SPI1_CS0 (C9) -> HSEC PIN (81)
    • MCU_SPI0_CLK (A11) -> HSEC PIN (71) -> MCU_SPI1_CLK (A10) -> HSEC PIN (79)
    • MCU_SPI0_D0 (C10) -> HSEC PIN (69) -> MCU_SPI1_D1 (D9) -> HSEC PIN (77)
    • MCU_SPI0_D1 (B11) -> HSEC PIN (67) -> MCU_SPI1_D0 (B10) -> HSEC PIN (75)
• Launch a CCS debug session and run the executable, see CCS Launch, Load and Run

See Also

MCSPI

Sample Output

Shown below is a sample output when the application is run,

[MCSPI] External Loopback example started in Peripheral mode...
[r5f0-1]     0.000059s : [MCSPI] External Loopback example started in Controller mode...
Successfully received and sent data in Peripheral mode!! 
[r5f0-1]     2.348816s : Successfully received and sent data in Controller mode!! 
[r5f0-1]     2.348837s : All tests have passed!!