81 lines
1.9 KiB
C
81 lines
1.9 KiB
C
// led blink example Copyright (C) 2014 Diego Herranz
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#define NO_BIT_DEFINES
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#include <pic14regs.h>
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#include <stdint.h>
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// Oscillator Selection bits (INTOSCIO oscillator: I/O function on RA6/OSC2/CLKOUT pin, I/O function on RA7/OSC1/CLKIN),
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// disable watchdog,
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// and DO NOT disable low voltage programming.
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// The rest of fuses are left as default.
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__code uint16_t __at (_CONFIG1) __configword = _FOSC_INTOSC & _CLKOUTEN_OFF & _WDTE_OFF & _BOREN_ON & _CP_OFF;
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#define LED_PORT PORTCbits.RC5
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#define LED_TRIS TRISCbits.TRISC5
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// board layout:
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// mosfets clockwise from power feed:
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// RA5, RA4, RC2, RC3
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// 'input' pin: RC5
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// microsecond delay.
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static inline void delay(uint8_t us)
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{
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TMR1L = 0;
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while(TMR1L < us);
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}
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#define ADDTOUINT16(REG, LIT) __asm \
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BANKSEL REG \
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MOVLW LIT \
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ADDWF _##REG##L, F \
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CLRW \
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ADDWFC _##REG##H, F \
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__endasm
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#define SUBFROMUINT16(REG, LIT) __asm \
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BANKSEL REG \
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MOVLW LIT \
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SUBWF _##REG##L, F \
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CLRW \
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SUBWFB _##REG##H, F \
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__endasm
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#define PPSO_PWM1 3
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void main(void)
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{
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OSCCON = 0xf0;
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TRISC = 0;
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T1CON = 0x31; // timer1 at 1 mhz, so 1us
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ANSELA = 0;
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TRISA = 0;
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//SLRCONC = 0;
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LED_PORT = 0;
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PWM1CLKCON = 0x00; // From Fosc w/o prescaler
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PWM1PRH = PWM1PRL = 0xFF; // period: 32 mhz / 65535 = 488 Hz
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PWM1PH = 0;
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PWM1DCH = PWM1DCL = 0;
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PWM1OF = 0;
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PWM1INTE = 0x00; // no interrupts enabled
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PWM1INTF = 0x00; // clear interrupt flag
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PWM1LDCON = 0x80; // load armed
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PWM1OFCON = 0x00; // independent run mode
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PWM1CON = 0x80; // enable, standard PWM mode, active high output
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RC5PPS = PPSO_PWM1;
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while(1) {
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while (PWM1DCL < 0xFF || PWM1DCH < 0xFE) {
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ADDTOUINT16(PWM1DC, 1);
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PWMLD = 1;
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delay(50);
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}
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while (PWM1DCL > 0 || PWM1DCH > 0) {
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SUBFROMUINT16(PWM1DC, 1);
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PWMLD = 1;
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delay(50);
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}
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}
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}
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