| 0,0 → 1,136 |
|---|
| #include <xc.h> |
| #include "defines.h" |
| #include "NEOPIXEL.h" |
| |
| static NEOPIXEL_DATA* neopixel_data_ptr; |
| |
| void NeoPixel_Init(NEOPIXEL_DATA *data) { |
| neopixel_data_ptr = data; |
| |
| // Clear buffer |
| for (char i = 0; i < NEOPIXEL_LENGTH * 3; i++) { |
| neopixel_data_ptr->values[i] = 0x0; |
| } |
| |
| // Output pin initially blocked |
| NEOPIXEL_TRIS = 1; |
| |
| /* Initialize PWM module */ |
| PR2 = 0x09; // 1.25us @ 32MHz |
| CCP1CONbits.P1M = 0b00; // Single output, P1A modulated only |
| CCP1CONbits.CCP1M = 0b1100; // PWM mode, P1A active-high, P1B active-high |
| |
| // Idle the output till width is specified |
| CCPR1L = 0x00; |
| CCP1CONbits.DC1B = 0b00; |
| |
| /* Initialize Timer 2 */ |
| PIR1bits.TMR2IF = 0; // Clear the interrupt flag for Timer 2 |
| T2CONbits.T2CKPS = 0b00; // Set a prescaler of 1:1 |
| T2CONbits.TMR2ON = 1; // Enable the timer |
| |
| // Wait for the timer to overflow before enabling output |
| while (!PIR1bits.TMR2IF); |
| NEOPIXEL_TRIS = 0; |
| } |
| |
| void NeoPixel_Set(char index, char R, char G, char B) { |
| if (index >= NEOPIXEL_LENGTH) return; |
| |
| neopixel_data_ptr->values[(index * 3) + 0] = G; |
| neopixel_data_ptr->values[(index * 3) + 1] = R; |
| neopixel_data_ptr->values[(index * 3) + 2] = B; |
| } |
| |
| void NeoPixel_Write_All(void) { |
| for (char i = 0; i < NEOPIXEL_LENGTH * 3; i++) { |
| NeoPixel_Write_One(neopixel_data_ptr->values[i]); |
| } |
| // Delay for 50us to latch data |
| __delay_us(50); |
| } |
| |
| void NeoPixel_Write_One(char value) { |
| // Enable timer and wait for it to overflow |
| T2CONbits.TMR2ON = 1; |
| while (!PIR1bits.TMR2IF); |
| |
| // Set pulse width for bit 7 |
| if (value & 0x80) { |
| CCPR1L = NEOPIXEL_LOGIC_1; // ~800ns high, ~450ns low (logic 1) |
| } else { |
| CCPR1L = NEOPIXEL_LOGIC_0; // ~400ns high, ~850ns low (logic 0) |
| } |
| while (!PIR1bits.TMR2IF); |
| |
| // Set pulse width for bit 6 |
| if (value & 0x40) { |
| CCPR1L = NEOPIXEL_LOGIC_1; // ~800ns high, ~450ns low (logic 1) |
| } else { |
| CCPR1L = NEOPIXEL_LOGIC_0; // ~400ns high, ~850ns low (logic 0) |
| } |
| while (!PIR1bits.TMR2IF); |
| |
| // Set pulse width for bit 5 |
| if (value & 0x20) { |
| CCPR1L = NEOPIXEL_LOGIC_1; // ~800ns high, ~450ns low (logic 1) |
| } else { |
| CCPR1L = NEOPIXEL_LOGIC_0; // ~400ns high, ~850ns low (logic 0) |
| } |
| while (!PIR1bits.TMR2IF); |
| |
| // Set pulse width for bit 4 |
| if (value & 0x10) { |
| CCPR1L = NEOPIXEL_LOGIC_1; // ~800ns high, ~450ns low (logic 1) |
| } else { |
| CCPR1L = NEOPIXEL_LOGIC_0; // ~400ns high, ~850ns low (logic 0) |
| } |
| while (!PIR1bits.TMR2IF); |
| |
| // Set pulse width for bit 3 |
| if (value & 0x08) { |
| CCPR1L = NEOPIXEL_LOGIC_1; // ~800ns high, ~450ns low (logic 1) |
| } else { |
| CCPR1L = NEOPIXEL_LOGIC_0; // ~400ns high, ~850ns low (logic 0) |
| } |
| while (!PIR1bits.TMR2IF); |
| |
| // Set pulse width for bit 2 |
| if (value & 0x04) { |
| CCPR1L = NEOPIXEL_LOGIC_1; // ~800ns high, ~450ns low (logic 1) |
| } else { |
| CCPR1L = NEOPIXEL_LOGIC_0; // ~400ns high, ~850ns low (logic 0) |
| } |
| while (!PIR1bits.TMR2IF); |
| |
| // Set pulse width for bit 1 |
| if (value & 0x02) { |
| CCPR1L = NEOPIXEL_LOGIC_1; // ~800ns high, ~450ns low (logic 1) |
| } else { |
| CCPR1L = NEOPIXEL_LOGIC_0; // ~400ns high, ~850ns low (logic 0) |
| } |
| while (!PIR1bits.TMR2IF); |
| |
| // Set pulse width for bit 0 |
| if (value & 0x01) { |
| CCPR1L = NEOPIXEL_LOGIC_1; // ~800ns high, ~450ns low (logic 1) |
| } else { |
| CCPR1L = NEOPIXEL_LOGIC_0; // ~400ns high, ~850ns low (logic 0) |
| } |
| |
| // Idle line low |
| while (!PIR1bits.TMR2IF); |
| asm("NOP"); |
| asm("NOP"); |
| asm("NOP"); |
| asm("NOP"); |
| asm("NOP"); |
| CCPR1L = 0b00000000; |
| |
| // Disable and reset timer |
| while (!PIR1bits.TMR2IF); |
| asm("NOP"); |
| asm("NOP"); |
| T2CONbits.TMR2ON = 0; |
| TMR2 = 0x0; |
| } |