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3ee8525 Jan 11, 2015
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184 lines (148 sloc) 3.94 KB
const int strobe = 7;
const int clock = 9;
const int data = 8;
void sendCommand(uint8_t value)
{
digitalWrite(strobe, LOW);
shiftOut(data, clock, LSBFIRST, value);
digitalWrite(strobe, HIGH);
}
void reset()
{
sendCommand(0x40); // set auto increment mode
digitalWrite(strobe, LOW);
shiftOut(data, clock, LSBFIRST, 0xc0); // set starting address to 0
for(uint8_t i = 0; i < 16; i++)
{
shiftOut(data, clock, LSBFIRST, 0x00);
}
digitalWrite(strobe, HIGH);
}
void setup()
{
pinMode(strobe, OUTPUT);
pinMode(clock, OUTPUT);
pinMode(data, OUTPUT);
sendCommand(0x8f); // activate
reset();
}
#define COUNTING_MODE 0
#define SCROLL_MODE 1
#define BUTTON_MODE 2
void loop()
{
static uint8_t mode = COUNTING_MODE;
switch(mode)
{
case COUNTING_MODE:
mode += counting();
break;
case SCROLL_MODE:
mode += scroll();
break;
case BUTTON_MODE:
buttons();
break;
}
delay(200);
}
bool counting()
{
/*0*/ /*1*/ /*2*/ /*3*/ /*4*/ /*5*/ /*6*/ /*7*/ /*8*/ /*9*/
uint8_t digits[] = { 0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f };
static uint8_t digit = 0;
sendCommand(0x40);
digitalWrite(strobe, LOW);
shiftOut(data, clock, LSBFIRST, 0xc0);
for(uint8_t position = 0; position < 8; position++)
{
shiftOut(data, clock, LSBFIRST, digits[digit]);
shiftOut(data, clock, LSBFIRST, 0x00);
}
digitalWrite(strobe, HIGH);
digit = ++digit % 10;
return digit == 0;
}
bool scroll()
{
uint8_t scrollText[] =
{
/* */ /* */ /* */ /* */ /* */ /* */ /* */ /* */
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
/*H*/ /*E*/ /*L*/ /*L*/ /*O*/ /*.*/ /*.*/ /*.*/
0x76, 0x79, 0x38, 0x38, 0x3f, 0x80, 0x80, 0x80,
/* */ /* */ /* */ /* */ /* */ /* */ /* */ /* */
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
/*H*/ /*E*/ /*L*/ /*L*/ /*O*/ /*.*/ /*.*/ /*.*/
0x76, 0x79, 0x38, 0x38, 0x3f, 0x80, 0x80, 0x80,
};
static uint8_t index = 0;
uint8_t scrollLength = sizeof(scrollText);
sendCommand(0x40);
digitalWrite(strobe, LOW);
shiftOut(data, clock, LSBFIRST, 0xc0);
for(int i = 0; i < 8; i++)
{
uint8_t c = scrollText[(index + i) % scrollLength];
shiftOut(data, clock, LSBFIRST, c);
shiftOut(data, clock, LSBFIRST, c != 0 ? 1 : 0);
}
digitalWrite(strobe, HIGH);
index = ++index % (scrollLength << 1);
return index == 0;
}
void buttons()
{
uint8_t promptText[] =
{
/*P*/ /*r*/ /*E*/ /*S*/ /*S*/ /* */ /* */ /* */
0x73, 0x50, 0x79, 0x6d, 0x6d, 0x00, 0x00, 0x00,
/* */ /* */ /* */ /* */ /* */ /* */ /* */ /* */
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
/*b*/ /*u*/ /*t*/ /*t*/ /*o*/ /*n*/ /*S*/ /* */
0x7c, 0x1c, 0x78, 0x78, 0x5c, 0x54, 0x6d, 0x00,
/* */ /* */ /* */ /* */ /* */ /* */ /* */ /* */
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
static uint8_t block = 0;
uint8_t textStartPos = (block / 4) << 3;
for(uint8_t position = 0; position < 8; position++)
{
sendCommand(0x44);
digitalWrite(strobe, LOW);
shiftOut(data, clock, LSBFIRST, 0xC0 + (position << 1));
shiftOut(data, clock, LSBFIRST, promptText[textStartPos + position]);
digitalWrite(strobe, HIGH);
}
block = (block + 1) % 16;
uint8_t buttons = readButtons();
for(uint8_t position = 0; position < 8; position++)
{
uint8_t mask = 0x1 << position;
setLed(buttons & mask ? 1 : 0, position);
}
}
uint8_t readButtons(void)
{
uint8_t buttons = 0;
digitalWrite(strobe, LOW);
shiftOut(data, clock, LSBFIRST, 0x42);
pinMode(data, INPUT);
for (uint8_t i = 0; i < 4; i++)
{
uint8_t v = shiftIn(data, clock, LSBFIRST) << i;
buttons |= v;
}
pinMode(data, OUTPUT);
digitalWrite(strobe, HIGH);
return buttons;
}
void setLed(uint8_t value, uint8_t position)
{
pinMode(data, OUTPUT);
sendCommand(0x44);
digitalWrite(strobe, LOW);
shiftOut(data, clock, LSBFIRST, 0xC1 + (position << 1));
shiftOut(data, clock, LSBFIRST, value);
digitalWrite(strobe, HIGH);
}