SPRUJF0 August   2025 F28E120SB , F28E120SC , TMS320F2802-Q1 , TMS320F28020 , TMS320F280200 , TMS320F28021 , TMS320F28022 , TMS320F28022-Q1 , TMS320F280220 , TMS320F28023 , TMS320F28023-Q1 , TMS320F280230 , TMS320F28026 , TMS320F28026-Q1 , TMS320F28026F , TMS320F28027 , TMS320F28027-Q1 , TMS320F280270 , TMS320F28027F , TMS320F28027F-Q1 , TMS320F28030 , TMS320F28030-Q1 , TMS320F28031 , TMS320F28031-Q1 , TMS320F28032 , TMS320F28032-Q1 , TMS320F28033 , TMS320F28033-Q1 , TMS320F28034 , TMS320F28034-Q1 , TMS320F28035 , TMS320F28035-EP , TMS320F28035-Q1

 

  1.   1
  2.   TMS320F2802x/TMS320F2803x to TMS320F28E12x Migration Overview
  3.   Trademarks
  4. 1 Introduction
    1. 1.1 Abbreviations
  5. 2 Central Processing Unit (CPU)
  6. 3 Development Tools
    1. 3.1 Driver Library (Driverlib)
    2. 3.2 Migrating Between IQ_Math and Native Floating-Point
    3. 3.3 Embedded Application Binary Interface (EABI) Support
  7. 4 Package and Pinout
  8. 5 Operating Frequency and Power Management
  9. 6 Power Sequencing
  10. 7 Memory Map
    1. 7.1 Random Access Memory (RAM)
    2. 7.2 Flash and OTP
      1. 7.2.1 Size and Number of Sectors
      2. 7.2.2 Flash Parameters
      3. 7.2.3 Entry Point into Flash
      4. 7.2.4 Dual Code Security Module (DCSM) and Password Locations
      5. 7.2.5 OTP
      6. 7.2.6 Flash Programming
    3. 7.3 Boot ROM
      1. 7.3.1 Boot ROM Reserved RAM
      2. 7.3.2 Boot Mode Selection
      3. 7.3.3 Bootloaders
  11. 8 Architectural Enhancements
    1. 8.1 Clock Sources and Domains
    2. 8.2 Dual-Clock Comparator (DCC) Module
    3. 8.3 Watchdog Timer
    4. 8.4 Peripheral Interrupt Expansion (PIE)
    5. 8.5 Lock Protection Registers
    6. 8.6 General-Purpose Input/Output (GPIO)
    7. 8.7 External Interrupts
    8. 8.8 Crossbar (X-BAR)
  12. 9 Peripherals
    1. 9.1 New Peripherals
      1. 9.1.1 Direct Memory Access (DMA)
      2. 9.1.2 Analog Subsystem Interconnect
      3. 9.1.3 Comparator Subsystem (CMPSS)
      4. 9.1.4 Programmable Gain Amplifier (PGA)
    2. 9.2 Control Peripherals
      1. 9.2.1 Enhanced Pulse Width Modulator (MCPWM)
      2. 9.2.2 Enhanced Capture Module (eCAP)
      3. 9.2.3 Enhanced Quadrature Encode Pulse Module (eQEP)
    3. 9.3 Analog Peripherals
      1. 9.3.1 Analog-to-Digital Converter (ADC)
    4. 9.4 Communication Peripherals
      1. 9.4.1 SPI
      2. 9.4.2 SCI
      3. 9.4.3 UART
      4. 9.4.4 I2C
  13. 10Emulation – JTAG Port
  14. 11Silicon Errata
  15. 12Device Comparison Summary
  16. 13References

3.2 Migrating Between IQ_Math and Native Floating-Point

The following steps must be taken to convert a project written in IQmath format to native floating point:

  1. Select FLOAT_MATH in the IQmath header file. The header file converts all IQmath function calls to their floating-point equivalent.
  2. Convert the floating-point number to an integer when writing a floating-point number into a device register. Likewise, when reading a value from a register, it needs to be converted to float. In both cases, this is done by multiplying the number by a conversion factor. For example, to convert a floating-point number to IQ15, multiply by 32768.0 as shown below: 
    #if MATH_TYPE == IQ_MATH
   PwmReg = (int16)_IQtoIQ15(Var1);
#else // MATH_TYPE is FLOAT_MATH
   PwmReg = (int16)(32768.0L*Var1);
#endif

    To convert from an IQ15 value to a floating-point value, multiply by 1/32768.0 or 0.000030518.

  3. Do the following to take advantage of the on-chip floating-point unit:
    1. Use Code Composer Studio with the C28x codegen tools version 19.6.0 or later.
    2. Set the compiler so that it can generate native C28x floating-point code. To do this, use the –v28 --float_support=fpu32 compiler switches. In Code Composer Studio, the float_support switch is under Compiler Options → Processor Options.
    3. Use the correct run-time support library for native 32-bit floating-point. It is recommended to include libc.a rather than directly including the RTS library. Note that libc.a is an index that automatically selects the correct .lib based on the project properties.
    4. Consider using the C28x FPU Fast RTS Library (C2000Ware → libraries → math → FPUfastRTS) to get a performance boost from math functions such as sin, cos, div, sqrt, and atan. The Fast RTS Library can be linked in before the normal run-time support library.