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Serial Peripheral Interface (SPI)
17-37
Keil Simulator
if (AISTAT & 0x04)
{/*Receiver*/
i = SPIRCON & 0x7F; //extract the count for the number of
AISTAT &= ~0x04; //deactivate SPI receive flag
if (l >= 50)
{
/*do not exceed the 50 received_data[] array limit*/
for (l = 0; l < 5; l++)
{
printf (”\n”);
for (k = 0; k < 10; k++)
{
printf (” %c”, received_data[k + l * 10] );
}
}
printf (”\n”);
l=0; //reset the received_data[] array index.
}
for (k = 0; k < i; k++)
{
if (l >= 50)
break;
/*data received through the SPI channel is read at the SPIDATA SFR*/
received_data[l++] = SPIDATA; //keep track of received data
}
}
}
void main(void)
{
setport ();
init_spi ();
test_spi ();
}
In addition to the main simulation program, a µVision 2 debugging program
was also written to supply the received data to the test simulation program.
This µVision program transmits and receives data at periodic intervals from the
main program. The SPI communication protocol is used for this data transfer.
The µVersion 2 debug program behaves as the slave, while the main program
is the master. The debug program is presented and explained in the following
section.