《《TMS320x28xxPeripherals inc++》.pdf

Application Report SPRAA85D– November 2005– Revised January 2013 Programming TMS320x28xx and 28xxx Peripherals in C/C++ Lori Heustess AEC C2000 ABSTRACT This application report explores a hardware abstraction layer implementation to make C/C++ coding easier on C28x devices. This method is compared to traditional #define macros and topics of code efficiency and special case registers are also addressed. Contents 1 Introduction 1 2 Traditional #define Approach 3 3 Bit Field and Register-File Structure Approach 5 4 Bit Field and Register-File Structure Advantages 11 5 Code Size and Performance Using Bit Fields 12 6 Read-Modify-Write Considerations When Using Bit Fields 16 7 A Special Case: eCAN Control Registers 21 8 References 23 List of Figures 1 SCI SCICCR Register 9 2 SCI SCICTL1 Register 9 3 Code Composer Studio v5.1 Autocomplete Feature 12 4 Code Composer Studio v5.1 Expression Window 12 5 Peripheral Clock Control 0 Register (PCLKCR0) 13 List of Tables 1 SCI-A, SCI-B Configuration and Control Registers 3 2 SCI-A and SCI-B Common Register File 5 3 CPU-Pipeline Activity