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Serial port program using vc++

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hmsheng

hmsheng

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vc++ com serial

I have two serial ports on my PC. I want to generate 3 signals simultaneously from 3 of the 9 pins of the serial port. The 3 signals include a clock signal, a enable signal, and a data signal. These signals will used for input of a 3 wire serial program interface (SPI). Can I realize this function by vc++ program?
See attached file for the 3 signal waveforms.
 

The generation of the signal of your waveform is extremly simple (assume that the clk is just an index, then) :

if(start)
for(clk=0; clk<8; clk++) {
cs = 1;
switch (clk) {
case 0: case 1: case 5: case 7:
out = 1;
break;
default :
out = 0;
break;
} //end sw
}//end for
cs = 0;
}//end start

but the actual driver of the actual physical port pins on the port is a OS dependent.
 

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