SPRACM3E August   2021  – January 2023 TMS320F280021 , TMS320F280021-Q1 , TMS320F280023 , TMS320F280023-Q1 , TMS320F280023C , TMS320F280025 , TMS320F280025-Q1 , TMS320F280025C , TMS320F280025C-Q1 , TMS320F280033 , TMS320F280034 , TMS320F280034-Q1 , TMS320F280036-Q1 , TMS320F280036C-Q1 , TMS320F280037 , TMS320F280037-Q1 , TMS320F280037C , TMS320F280037C-Q1 , TMS320F280038-Q1 , TMS320F280038C-Q1 , TMS320F280039 , TMS320F280039-Q1 , TMS320F280039C , TMS320F280039C-Q1 , TMS320F280040-Q1 , TMS320F280040C-Q1 , TMS320F280041 , TMS320F280041-Q1 , TMS320F280041C , TMS320F280041C-Q1 , TMS320F280045 , TMS320F280048-Q1 , TMS320F280048C-Q1 , TMS320F280049 , TMS320F280049-Q1 , TMS320F280049C , TMS320F280049C-Q1 , TMS320F28384D , TMS320F28384S , TMS320F28386D , TMS320F28386S , TMS320F28388D , TMS320F28388S , TMS320F28P650DH , TMS320F28P650DK , TMS320F28P650SH , TMS320F28P650SK , TMS320F28P659DK-Q1

 

  1.   Using the Fast Serial Interface (FSI) With Multiple Devices in an Application
  2.   Trademarks
  3. 1Introduction to the FSI Module
  4. 2FSI Applications
  5. 3Handshake Mechanism
    1. 3.1 Daisy-Chain Handshake Mechanism
    2. 3.2 Star Handshake Mechanism
  6. 4Sending and Receiving FSI Data Frames
    1. 4.1 FSI Data Frame Configuration APIs
    2. 4.2 Start Transmitting Data Frames
  7. 5Daisy-Chain Topology Tests
    1. 5.1 Two Device FSI Communication
      1. 5.1.1 CPU Control
      2. 5.1.2 DMA Control
      3. 5.1.3 Hardware Control
    2. 5.2 Three Device FSI Communication
      1. 5.2.1 CPU/DMA Control
      2. 5.2.2 Hardware Control
        1. 5.2.2.1 Skew Compensation for Three Device Daisy-Chain System
          1. 5.2.2.1.1 CPU/DMA control
          2. 5.2.2.1.2 Hardware Control
  8. 6Star Topology Tests
  9. 7Event Synchronization Over FSI
    1. 7.1 Introduction
      1. 7.1.1 Requirement of Event Sync for Distributed Systems
      2. 7.1.2 Solution Using FSI Event Sync Mechanism
      3. 7.1.3 Functional Overview of FSI Event Sync Mechanism
    2. 7.2 C2000Ware FSI EPWM Sync Examples
      1. 7.2.1 Location of the C2000Ware Example Project
      2. 7.2.2 Summary of Software Configurations
        1. 7.2.2.1 Lead Device Configuration
        2. 7.2.2.2 Node Device Configuration
      3. 7.2.3 1 Lead and 2 Node F28002x Device Daisy-Chain Tests
        1. 7.2.3.1 Hardware Setup and Configurations
        2. 7.2.3.2 Experimental Results
      4. 7.2.4 1 Lead and 8 Node F28002x Device Daisy-Chain Tests
        1. 7.2.4.1 Hardware Setup and Configurations
        2. 7.2.4.2 Experimental Results
      5. 7.2.5 Theoretical C2000 Uncertainties
    3. 7.3 Additional Tips and Usage of FSI Event Sync
      1. 7.3.1 Running the Example
      2. 7.3.2 Target Configuration File
      3. 7.3.3 Usage of Event Sync for Star Configuration
  10. 8References
  11. 9Revision History

5 Daisy-Chain Topology Tests

In order to demonstrate the communication speed and different configurations for FSI, daisy-chain connections for two device and three device configurations have been tested and validated. The test hardware utilized is composed of multiple F280025C ControlCARD Evaluation Modules and TMDSFSIADAPEVMs.

Note: 1. These same tests can be performed with other FSI enabled C2000 MCU LaunchPads and ControlCARDs with similar hardware setups.

2. The hardware pass-through feature is tested with LAUNCHXL-F280039C and TMDSFSIADAPEVMs as this feature is only available in this device.

The tested example projects can be found within the C2000WARE download. All test results were collected using optimization level 2, configured within Code Composer Studio™ (CCS). Changing the optimization level may yield different results. An overall description of the tested projects is shown in Table 5-1. For better understanding, a general software flow chart with different project settings is shown in Figure 5-1.

Table 5-1 Example Projects Description - Daisy-Chain
Project Description Settings
fsi_ex_daisy_handshake_lead Project for the lead device in the daisy-chain loop. ① [#define FSI_DMA_ENABLE 0 && #define FSI_RX_TDM_ENABLE 0] represents FSI communication using CPU control.
② [#define FSI_DMA_ENABLE 1 && #define TX_DMA_TRIGGER_ENABLE 0 && #define FSI_RX_TDM_ENABLE 0] represents FSI communication using DMA control, and using software to trigger DMA for the transmitted data (manually).
③ [#define FSI_DMA_ENABLE 1 && #define TX_DMA_TRIGGER_ENABLE 1 && #define FSI_RX_TDM_ENABLE 0] represents FSI communication using DMA control, and enabling FSITX to trigger DMA for the transmitted data.
④ [#define FSI_DMA_ENABLE 0 && #define FSI_RX_TDM_ENABLE 1] represents FSI communication using HW RX TDM control
fsi_ex_daisy_handshake_node Project for the N-1 other devices (N>=2) in the daisy-chain loop.
GUID-E75EFBF9-AF0E-4EB7-9AD8-14FFBDEF3A1F-low.png Figure 5-1 Software Flow Chart With Different Project Settings