SPRAD24 august   2023 AM2631 , AM2632 , AM2632-Q1 , AM2634 , AM2634-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Key System Specifications
  5. 2AM263x Overview
    1. 2.1 AM263x Control Card and Traction System Framework
  6. 3Guide to Running TIDM-02014 Traction Inverter
    1. 3.1 Software Set-up
      1. 3.1.1 Code Composer Studio Project
      2. 3.1.2 Software Structure
    2. 3.2 Create Real Time Debug Interface
      1. 3.2.1 Confirm CCS Features
      2. 3.2.2 Create Target Configuration File
      3. 3.2.3 Add Serial Command Monitor Software
      4. 3.2.4 Launch Real Time Debug
    3. 3.3 Running the Code
      1. 3.3.1 Project Setup
      2. 3.3.2 Running the Application
    4. 3.4 Get Samples From ADC and Read Samples Through CCS
      1. 3.4.1 Register and Enable Interrupt
      2. 3.4.2 Add Log Code to Read Samples in Graph at Fixed Rate
      3. 3.4.3 Read ADC Samples in Expression and Graph Windows
    5. 3.5 Generate Space Vector PWM and Drive Motor in Open Loop
      1. 3.5.1 Setup SVPWM Generator Inputs
      2. 3.5.2 Read SVPWM Duty Cycles in Graph Window
      3. 3.5.3 Power Up Inverter and Spin Motor in Open Loop
    6. 3.6 Close Current Loop With Mock Speed
      1. 3.6.1 Add Transformations and Read Id-Iq in Open Loop
      2. 3.6.2 Add Controllers to Close Current Loop
      3. 3.6.3 Read Id-Iq to Close Current Loop
    7. 3.7 Add Software Resolver to Digital Converter
      1. 3.7.1 Generate Excitation for Resolver Hardware
      2. 3.7.2 Add Resolver Software
      3. 3.7.3 Read Resolver Software Outputs
  7. 4Brief Guide to Code Migration
    1. 4.1 SDK Resources Overview
    2. 4.2 Code Migration From C28
    3. 4.3 Code Migration From AM24
  8. 5Summary
  9. 6References

3.7.1 Generate Excitation for Resolver Hardware

EDMA is configured to transfer data every EPWM7 SOCA event. To specify more details on the transfer, the function in the following line 1 is defined to initialize the EDMA with the location of data, size of data, and the location of DAC value register. To update the details, the function in the following line 2 is defined to change content of EDMA input table and DAC excitation output.

  • uint16_t RDCexc_start(uint16_t *table, uint16_t table_size, EDMA_Handle dma_handle, uint32_t dma_ch, uint32_t dac_base)
  • uint16_t RDCexc_update(uint16_t *table, uint16_t table_size, EDMA_Handle dma_handle, uint32_t dma_ch, uint32_t dac_base)

RDCexc_start needs to be called before control loop running, and RDCexc_update can be called while control loop running. The purpose of RDCexc_update is to reduce misalignment between excitation phase and sample time. Excitation phase can be adjusted by shifting the pointer of the input table before calling RDCexc_update. Examples are given in the following lines for both functions.

  1. RDCexc_start(gRDCtable_ptr,20,gEdmaHandle[0],DMA_TRIG_XBAR_EDMA_MODULE_0,CONFIG_DAC0_BASE_ADDR);
  2. RDCexc_update(gRDCtable_ptr,20,gEdmaHandle[0],DMA_TRIG_XBAR_EDMA_MODULE_0,CONFIG_DAC0_BASE_ADDR);

One element of a table in global scope is connected to gRDCtable_ptr. The table contains points of multiple full sine wave cycles. The element is in middle of the table so that the pointer can be shifted either right or left for excitation phase adjustment during operation. There are 20 points within one cycle. So, the length of EDMA input table is 20. EDMA handle, XBAR information and DAC address are available in configuration files.