AM263Px MCU+ SDK  11.00.00
TMU 4 Cores Support

Table of Contents

Introduction

This example demonstrates the usage of all four cores by TMU. Additionally, the example also implements Park and Inverse Park Transform which has use cases in high performance drive architectures related to permanent magnet synchronous and asynchronous machines. The implementation of this transform is as follows:

Park Transform: 

Isd = Ialpha*cos(theta) + Ibeta*sin(theta)
Isq = -Ialpha*sin(theta) + Ibeta*cos(theta)

Inverse Park Transform 

Ialpha = Isd*cos(theta) - Isq*sin(theta)
Ibeta = Isd*sin(theta) + Iq*cos(theta)

Ialpha = Stationary d-axis stator current

Ibeta = Stationary q-axis stator current

Isd = Rotating d-axis stator current

Isq = Rotating q-axis stator current

theta = Rotating angle in per unit

To implement the trigonometric function calls, TMU specific operations have been put into use as TMU have better performance in comparison to the C mathlib supported trigonometric function calls. This example can be run parallely on all four cores supported by the chip, due to it's multi-core functionality

Errata : TCM Memory Corruption on R5SS0_CORE1 and R5SS1_CORE1 when writing to TMU Registers

In AM263Px, the writes to TMU (TMU instance of core 1, in each cluster) corrupt the TCMA of the respective cores. That is, the writes TMU registers offset from 0x40 to 0x3A0 of TMU, will be reflected on the TCMA offsets 0x40 to 0x3A0.

The code / data present in the TCMA of these cores will be corrupted upon using these TMUs. Hence the following workaround is proposed: If the TMUs of Cores 1 are being used, their respective TCMAs should be blocked from 0x40 to 0x3A0. This workaround is implemented in the example TMU 4 Cores Support. Please refer Memory sections of the example's syscfg.

Supported Combinations

Parameter Value
CPU + OS r5fss0-0 nortos
r5fss0-1 nortos
r5fss1-0 nortos
r5fss1-1 nortos
Toolchain ti-arm-clang
Board am263px-cc, am263px-lp
Example folder examples/drivers/tmu/tmu_cores_support/

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)
  • Establish connections as mentioned in External Connections section
  • Launch a CCS debug session and run the executable, see CCS Launch, Load and Run
  • View the console log for results

Sample Output

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

[Cortex_R5_0] TMU Cores Support Test Started ...
Park Transform value : 500.000000 , 400.000000
Inverse Park Transform value : 150.000000 , 275.000000
TMU Cores Support Test Passed ...
All tests have passed!! ...
[Cortex_R5_1] TMU Cores Support Test Started ...
Park Transform value : 500.000000 , 400.000000
Inverse Park Transform value : 150.000000 , 275.000000
TMU Cores Support Test Passed ...
All tests have passed!! ...
[Cortex_R5_2] TMU Cores Support Test Started ...
Park Transform value : 500.000000 , 400.000000
Inverse Park Transform value : 150.000000 , 275.000000
TMU Cores Support Test Passed ...
All tests have passed!! ...
[Cortex_R5_3] TMU Cores Support Test Started ...
Park Transform value : 500.000000 , 400.000000
Inverse Park Transform value : 150.000000 , 275.000000
TMU Cores Support Test Passed ...
All tests have passed!! ...

See Also