int i_rad_display(const char* input) {
int status = -1;
if ((status = check_setup()) != 0) {
return status;
}
signed char i = 0; // char position
unsigned char j; // register counter
i = strlen(input) - 1;
j = 0;
for(; i >= 0; i--) {
printf("%c ", (char) input[i]);
switch(input[i]) {
case '-': REGISTER[j++] |= 0xa; break;
case 'e':
case 'E': REGISTER[j++] |= 0xb; break;
case 'h':
case 'H': REGISTER[j++] |= 0xc; break;
case 'l':
case 'L': REGISTER[j++] |= 0xd; break;
case 'p':
case 'P': REGISTER[j++] |= 0xe; break;
case ' ': REGISTER[j++] |= 0xf; break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9': REGISTER[j++] |= (input[i] - 48); break;
case '.': REGISTER[j] = 0x80; break; // set dot
default:
printf("Error value '%s'!\n", input[i]);
exit(1);
break;
}
if( j > DIGITS + 1 ) {
printf("Input longer then expected!\n");
exit(1);
}
}
Init7219( DIGITS, MODE_B, 8 );
for(i = 0; i<8; i++)
{
printf("REGISTER[%d] = '%#x'\n", i, REGISTER[i]);
MAX7219Send(i+1, REGISTER[i]);
}
return 0;
}
// Initialise 7219
//
// To try and ensure device initialised correctly always
//
// Leaves device in Test mode
//
// Pass in
// digits - number of digits to display - 1 (1 digit pass in 0)
// mode - display mode 7 segment (MODE_7SEG) control
// Segment Data bit 0 = seg A to bit 6 = seg G and bit 7 = DP
// or decode special set (MODE_B) as below
// Segment Data bits 0 to 3: 0 to 15 = 0 to 9, -, E, H, L, P, and ' ' (blank)
// note top 4 bits ignored
// level - intensity level (1-15)
//
// Exits program if no wiringPi installed or invalid parameters or LOAD fails to go high
//
void Init7219( int digits, int mode, int level )
{
// Initial checks
if( wiringPiSetup () == -1 ) exit( 1 );
if( digits < 0 || digits > 7 )
{
printf( "\nError Init7219 called with invalid number of digits of %d (should be 0 to 7)\n", digits );
exit( 1 );
}
//if( mode != MODE_B || mode != MODE_7SEG || level < 0 || level > 15 )
if( level < 0 || level > 15 )
{
printf( "\nError Init7219 invalid brigthness of %d!\n", level);
exit( 1 );
}
//We need 3 output pins to control the Max7219: Data, Clock and Load
pinMode( DATA, OUTPUT );
pinMode( CLOCK, OUTPUT );
pinMode( LOAD, OUTPUT );
// Initial states of pins
digitalWrite( LOAD, 1 ); // set LOAD 1 to start
digitalWrite( CLOCK, 0 ); // set CLOCK to 0
digitalWrite( DATA, 0 ); // set DATA to 0
// Quick test check LOAD pin actually HIGH as test
if( digitalRead( LOAD ) != 1 )
{
printf( "\nError Max7219 LOAD pin %u failed to go high\n", LOAD );
exit( 2 );
}
// Ensure shift refister is all zeros no random clocks occured
// and loaded into device to synchronise shift register
MAX7219Send( NO_OP, 0 );
MAX7219Send( SCAN_LIMIT, digits ); // set up to scan number of digits
MAX7219Send( DECODE_MODE, mode ); // Set BCD decode mode
MAX7219Send( DISPLAY_TEST, 0); // disable test mode
MAX7219Send( INTENSITY, level ); // set brightness 0 to 15
MAX7219Send( SHUTDOWN, 1 ); // Ensure in Normal mode of operation
}
int main (void)
{
int i, j;
int sleep = 15;
printf ("MrRetupmoc's Raspberry Pi - Bi-Polar Stepper\n");
if (wiringPiSetup () == -1) exit (1); // WiringPi Setup
pinMode(DATA, OUTPUT); // Setup Output Mode for Data
pinMode(CLOCK, OUTPUT); // Setup Output Mode for Clock
pinMode(LOAD, OUTPUT); // Setup Output Mode for Load
MAX7219Send(SCAN_LIMIT, 16); // Scan Limit
// BCD decode mode off : data bits correspond to the segments (A-G and DP) of the seven segment display.
// BCD mode on : 0 to 15 = 0 to 9, -, E, H, L, P, and ' '
MAX7219Send(DECODE_MODE, 0); // Set BCD decode mode on
MAX7219Send(DISPLAY_TEST, 0); // Disable test mode
MAX7219Send(INTENSITY, 15); // set brightness 0 to 15
MAX7219Send(SHUTDOWN, 1); // come out of shutdown mode / turn on the digits
for (j = 1; j < 10; j++) // Loop For 9 Times or J, Forward First
{
printf ("Step Forward \n"); // Print "Stepping Forward"
for(i = 0; i < (100 / j); i++) // Loop For 100 Divided by J
{
MAX7219Send(1,0); // Displays the binary number 00
delay(sleep); // Sleep
MAX7219Send(1,2); // Displays the binary number 10
delay(sleep); // Sleep
}
delay(500); // Sleep
printf ("Step Backward \n"); // Print "Stepping Backward"
for(i = 0; i < (100 / j); i++) // Loop For 100 Divided by J
{
MAX7219Send(1,1); // Displays the binary number 01
delay(sleep); // Sleep
MAX7219Send(1,3); // Displays the binary number 11
delay(sleep); // Sleep
}
}
for (j = 1; j < 10; j++) // Loop For 9 Times or J, Backward First
{
printf ("Step Backward \n"); // Print "Stepping Backward"
for(i = 0; i < (100 / j); i++) // Loop For 100 Divided by J
{
MAX7219Send(1,1); // Displays the binary number 01
delay(sleep); // Sleep
MAX7219Send(1,3); // Displays the binary number 11
delay(sleep); // Sleep
}
delay(500); // Sleep
printf ("Step Forward \n"); // Print "Stepping Forward"
for(i = 0; i < (100 / j); i++) // Loop For 100 Divided by J
{
MAX7219Send(1,0); // Displays the binary number 00
delay(sleep); // Sleep
MAX7219Send(1,2); // Displays the binary number 10
delay(sleep); // Sleep
}
}
delay(500); // Sleep
MAX7219Send(SHUTDOWN, 0); // Turn OFF the AS1100 Controller
delay(200); // Sleep
return 0;
}
