example-4.txt

DSP TMS320 LF2407 or 243 经典 例程, from TI

TMS320F243 DSP - Laboratory

Example 4 : F243DIL2

 

Environment : 

This Example was made for TI's EVM-board TMS320F243 with additional hardware connected to the external board connectors P1 to P4. In this example we use the GPIO's D0 to D7. Each Pin of Port D is used as output, connected with a resistor R1 (1,5k) to the basis of an npn-general purpose transistor. The emitter of this npn is connected to ground, the collector to the cathode of a LED. The anode of the LED is connected with an resistor R2 (220 Ohm) to Vcc. In addition to examples 1 and 2 we use general purpose port B0..B7 now as digital inputs. There are 8 DIP-switches connected to B0..B7. A closed switch sets the input line to ground, an open switch connects the input port with a pullup resistor (22k) to Vcc (5V).

 

Aim:

The program reads the status of the 8 DIP-Switches and shows it on the 8 LED's connected to GPIO-D0...D7 . The difference to example 3 is that the time-delay between the steps is now made by general purpose timer GPT1 and its Interrupt Service Routine. 

 

Files: 

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

 F243DIL2.C   -- C-source code for this example

 vectors.asm   -- jump table for Interrupt Service Routines

 regs243.h      -- pointer definitions to memory mapped  perihperals

 LED243C.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 4