example-6.txt

来自「DSP TMS320 LF2407 or 243 经典 例程, from TI」· 文本 代码 · 共 37 行

TMS320F243 DSP - Laboratory

Example 6 : F243PWM

 

Environment : 

This Example was made for TI's EVM-board TMS320F243. For this particular exercise we do not need any additional hardware. All you need is a digital storage oscilloscope to verify the pulse width modulation outputs.

Aim:

The program generates a pulse width modulation signal at Pin T1PWM (Pin 130) od the DSP. It uses general purpose timer GPT1 in non-symmetric mode ( counting up). The output polarity of GPT1 is low.  The program uses the T1-Compare-Interrupt Service Routine to change the length of the duty-cycle 'on the fly' .

 

Files: 

The Example should be used as a project in Code-Composer, the Go-DSP-design tool. The project consists of these files : 

 pwm04.c          -- C-source code for this example

 vectors.asm   -- jump table for Interrupt Service Routines

 regs243.h      -- pointer definitions to memory mapped  perihperals

 pwm01.cmd -- memory map definition file for the linker

 init243.gel       -- Code Composer Setup file ( GO-DSP extension language )

 rts2xx.lib          -- runtime library file (part of TI's compiler/assembler) 

 wait.asm     -- small collection of supplemental assembler functions

  

    Download (all files zipped):   Example 6