Software Overview
8.5.2Mono Interrupt Driven Mode Using CSTART to Start Conversion
The following descriptions explain the software for the data acquisition in monomode using the CSTART signal. The required interface connections are shown in Figure 1.
Program Files:
MONOCST1.ASM | Includes the complete software algorithm to control the monomode |
CALIBRAT.ASM | Calibration procedure of the DAC |
CONSTANT.ASM | Common file of all modes (constants definition) |
VECTORS.ASM | Common file of all modes (IRQ vector table) |
Other Files: |
|
linker.cmd | Organization of the DSP memory (data and program memory) |
auto.bat | Batch file to start the compiler for the monomode software |
asm500.exe | C54x Code compiler |
lnk500.exe | C54x linker |
The timing requirements to interface the ’C54x to the ADC are provided in Table
8.The STEP numbers, given there, can be found again as Marker in the code. This helps to debug and verify the code.
IMPORTANT NOTE: The code has been optimized during the software development to maximize the data throughput. It was found that CSTART can be pulled down earlier than the data read instruction is performed by the DSP. The advantage is to save the
Code verification:
To verify the software, the user must change the code in the MONCST1.ASM file and save those changes. The next step is to recompile the four .ASM files by executing the AUTO.BAT batch file. If compiler and linker finish without error messages, the new output file is ready to load in the DSP program memory (e.g. with the GoDSP development tools) and to execute.
The flowchart in Figure 8 gives a general overview of the software structure (MONOCST1.ASM).
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