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mVision 2 Debug Program Example
17-38
17.12 µVision 2 Debug Program Example
SIGNAL void spi_sim (void)
{
/*This program runs in parallel with the main program.
It sends out a character byte whose value is post incremented at the end of
each associated time lapse.
SPI_IN is the portal through which the byte data is sent to the main program.
In addition, the data transmitted from the main program is received at the
portal, SPI_OUT*/
int j;
j = 0x21; //initialize byte data value to be transmitted
spi_in = j; //send byte data
twatch (100); //idle 100 clock cycles
while (1) //start infinite loop
{
twatch (50);
j++; //increment value of byte data to be transmitted
spi_in = j; //transmit another byte of data
twatch (97); //wait 97 clock cycles
/*data transmitted from main program has been receive in portal SPI_OUT
automatically. Its value is displayed in the Command Line display area*/
printf (”\nSPI_OUT = %d”, spi_out);
j++;
/*send another incremented data byte, and receive and display a new data
byte transmitted from main.*/
spi_in = j;
twatch (116);
printf (”\nSPI_OUT = %d”, spi_out);
}
}
The data received from the µVersion 2 debug program, by the main SPI pro-
gram is written to the Serial #1 window. A snapshot of this window is included
in Figure 17−17.