void pfd_write(uint8_t value, int bit_num, uint8_t reg, uint8_t hw_addr)
{
pifacedigital_open(hw_addr);
if (bit_num >= 0) {
pifacedigital_write_bit(value, bit_num, reg, hw_addr);
} else {
pifacedigital_write_reg(value, reg, hw_addr);
}
pifacedigital_close(hw_addr);
}
void pifacedigital_digital_write(uint8_t pin_num, uint8_t value)
{
pifacedigital_write_bit(value, pin_num, OUTPUT, 0);
}
int main( int argc, char *argv[] )
{
uint8_t i = 0; /**< Loop iterator */
uint8_t inputs; /**< Input bits (pins 0-7) */
int hw_addr = 0; /**< PiFaceDigital hardware address */
int intenable = 1; /**< Whether or not interrupts are enabled */
/**
* Read command line value for which PiFace to connect to
*/
if (argc > 1) {
hw_addr = atoi(argv[1]);
}
/**
* Open piface digital SPI connection(s)
*/
printf("Opening piface digital connection at location %d\n", hw_addr);
pifacedigital_open(hw_addr);
/**
* Enable interrupt processing (only required for all
* blocking/interrupt methods)
*/
intenable = pifacedigital_enable_interrupts();
if ( intenable == 0) printf("Interrupts enabled.\n");
else printf("Could not enable interrupts. Try running using sudo to enable PiFaceDigital interrupts.\n");
/**
* Bulk set all 8 outputs at once using a hexidecimal
* representation of the inputs as an 8-bit binary
* number, where each bit represents an output from
* 0-7
*/
/* Set all outputs off (00000000) */
printf("Setting all outputs off\n");
pifacedigital_write_reg(0x00, OUTPUT, hw_addr);
sleep(1);
/* Set output states to alternating on/off (10101010) */
printf("Setting outputs to 10101010\n");
pifacedigital_write_reg(0xaa, OUTPUT, hw_addr);
sleep(1);
/* Set output states to alternating off/on (01010101) */
printf("Setting outputs to 01010101\n");
pifacedigital_write_reg(0x55, OUTPUT, hw_addr);
sleep(1);
/* Set all outputs off (000000) */
printf("Setting all outputs off\n");
pifacedigital_write_reg(0x00, OUTPUT, hw_addr);
/**
* Read/write single input bits
*/
uint8_t bit = pifacedigital_read_bit(0, OUTPUT, hw_addr);
printf("Reading bit 0: %d\n", bit);
sleep(1);
printf("Writing bit 0 to 0\n", bit);
pifacedigital_write_bit(0, 0, OUTPUT, hw_addr);
/**
* Set input pullups (must #include "mcp23s17.h")
*/
/* pifacedigital_write_reg(0xff, GPPUB, hw_addr); */
/**
* Bulk read all inputs at once
*/
inputs = pifacedigital_read_reg(INPUT, hw_addr);
printf("Inputs: 0x%x\n", inputs);
/**
* Write each output pin individually
*/
for (i = 0; i < 8; i++) {
const char *desc;
if (i <= 1) desc = "pin with attached relay";
else desc = "pin";
/* Turn output pin i high */
printf("Setting output %s %d HIGH\n", desc, (int)i);
pifacedigital_digital_write(i, 1);
sleep(1);
/* Turn output pin i low */
printf("Setting output %s %d LOW\n", desc, (int)i);
pifacedigital_digital_write(i, 0);
sleep(1);
}
/**
* Read each input pin individually
* A return value of 0 is pressed.
*/
for (i = 0; i < 8; i++) {
uint8_t pinState = pifacedigital_digital_read(i);
printf("Input %d value: %d\n", (int)i, (int)pinState);
}
/**
* Wait for input change interrupt
*/
if( intenable ) {
printf("Interrupts disabled, skipping interrupt tests.\n");
}
else {
printf("Waiting for input (press any button on the PiFaceDigital)\n");
inputs = pifacedigital_wait_for_input(-1, hw_addr);
printf("Inputs: 0x%x\n", inputs);
}
/**
* Close the connection to the PiFace Digital
*/
pifacedigital_close(hw_addr);
}