port 318LPW1K-L code for ACT-34B remote
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/* micro-controller firmware fot the Linear ACT-34B remote
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Copyright (C) 2014 Kévin Redon <kingkevin@cuvoodoo.info>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/* libraries */
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#define __12f617
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#include <pic12f617.h>
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#include <stdint.h>
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/* the peripherals connected to the pins */
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#define SWITCH1 _GP0
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#define SWITCH2 _GP3
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// note: SWITCH3 will behave as pressed when SWITCH4 is pressed
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#define SWITCH3 _GP1
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#define SWITCH4 _GP2
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// note: CLOCK will be enable also if only TX is enabled
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#define CLOCK _GP5
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#define TX _GP4
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/* simple functions */
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#define clock_on() GPIO |= CLOCK;
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#define clock_off() GPIO &= ~CLOCK;
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#define tx_on() GPIO |= TX;
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#define tx_off() GPIO &= ~TX;
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#define sleep() __asm sleep __endasm
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/* variables */
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// a megacode is 3 bytes long (MSB of byte 1 is 1)
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# define CODE 0xc917c2
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// transmitting (0: do not transmit, 1: transmit, -1: finish transmiting)
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volatile int8_t transmit = 0;
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// the 4 phases of the bit (2ms pause, 1ms pulse, 2ms pause, 1ms pulse. only transmit during one of the two pulse periode depending on the bit value)
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volatile uint8_t phase = 0;
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// save the GPIO state to be able to figure out which changed
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volatile last_gpio = GPIO;
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/* configuration bits */
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uint16_t __at(_CONFIG) __CONFIG = _WRT_OFF & // entire memory write protected
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_BOREN_OFF & // brown-out reset off
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_IOSCFS_4MHZ & // set internal oscillator to 4MHz
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_CP_OFF & // no code protection
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_MCLRE_OFF & // disable master clear reset
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_PWRTE_ON & // enable power-up timer
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_WDTE_OFF & // disable watchdog
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_INTRC_OSC_NOCLKOUT; // use internal oscillator and both I/O pins
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/* set timer in ms */
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#define TICKS_PER_MS 125UL // the number of timer 1 ticks to wait for 1ms, using the internal 4MHz clock and a prescaler of 8, and hand tuning
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void timer_1ms() {
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TMR1ON = 0; // disable timer 1 (to write value safely)
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TMR1L = (0xffff-1*TICKS_PER_MS); // set time
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TMR1H = (0xffff-1*TICKS_PER_MS)>>8; // set time
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TMR1ON = 1; // start timer 1
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}
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void timer_2ms() {
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TMR1ON = 0; // disable timer 1 (to write value safely)
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TMR1L = (0xffff-2*TICKS_PER_MS); // set time
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TMR1H = (0xffff-2*TICKS_PER_MS)>>8; // set time
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TMR1ON = 1; // start timer 1
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}
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/* transmit the megacode */
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void megacode (void) {
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uint8_t bit = phase/4;
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if (transmit != 0) {
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if (bit<24) { // transmit bit
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if (phase%2) {
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uint8_t pulse = (CODE>>(23-bit))&0x01;
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if ((phase%4==1 && !pulse) || (phase%4==3 && pulse)) {
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tx_on();
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}
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timer_1ms();
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} else {
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tx_off();
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timer_2ms();
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}
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} else if (bit==24) { // 25th bit is a blank
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tx_off();
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timer_2ms();
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} else { // restart after 25th bit
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phase = 0xff; // phase will be 0 after incrementing
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if (transmit == -1) { // stop transmiting if requested
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transmit = 0; // stop transmiting
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clock_off(); // stop clock
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}
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timer_1ms();
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}
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phase++; // go to next phase
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}
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}
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/* initialize micro-conroller */
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void init (void) {
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ANSEL = 0; // all pins are digital
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TRISIO |= SWITCH1|SWITCH2|SWITCH3|SWITCH4; // switches are inputs (per default)
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TRISIO &= ~(CLOCK|TX); // all other are outputs
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NOT_GPPU = 0; // enable global weak pull-up for inputs
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WPU |= SWITCH1|SWITCH3|SWITCH4; // use internal pull-up on switches (the external are weak)
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// SWITCH2 pull-up is not enabled because pins is not used as MCLR
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GPIO &= ~(CLOCK|TX); // clear output
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IOC |= (SWITCH1|SWITCH2|SWITCH3|SWITCH4); // enable interrupt for the switches
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GPIE = 1; // enable interrupt on GPIO
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last_gpio = GPIO; // save current state
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T1CON = _T1CKPS1 | _T1CKPS0; // set prescaler to 8
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// 0 is set per default, but just be sure
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TMR1ON = 0; // stop timer 1
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TMR1GE = 0; // enable timer 1
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TMR1CS = 0; // use internal clock / 4 (=1MHz)
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TMR1IF = 0; // clear interrupt
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PIE1 = 1; // enable timer 1 interrupt
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PEIE = 1; // enable timer interrupt
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GIE = 1; // enable interrups
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}
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// funcion called on interrupts
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// interrupt 0 is only one on PIC12
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static void interrupt(void) __interrupt 0
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{
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if (GPIF) { // pin state changed
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last_gpio ^= GPIO; // figure out which GPIO changed
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if (last_gpio&SWITCH2) { // switch 1 (bigger button on top right) changed
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if (GPIO&SWITCH2) { // button released, stop transmission
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if (transmit == 1) { // currently transmitting
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transmit = -1; // stop transmitting after last transmition
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}
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} else { // switch is pressed, start transmission
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if (transmit == 0) { // only transmit if code is loaded
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transmit = 1; // start transmission procedure
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phase = 0; // start from beginning
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clock_on(); // start clock and leave it on during the whole transmission
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megacode(); // start sending megacode
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}
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}
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}
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last_gpio = GPIO; // save current state
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GPIF = 0; // clear interrupt
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}
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if (TMR1IF) { // timer 1 overflow
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megacode(); // continue sending megacode
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TMR1IF = 0; // clean interrupt
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}
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}
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void main (void)
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{
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init(); // configure micro-controller
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transmit = 0; // disable transmission initialy
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while (1) { // a microcontroller runs forever
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if (transmit == 0) {
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// sleep(); // sleep to save power. this will shut down timer 1, but button press will wake it up
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}
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}
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}
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@ -0,0 +1,32 @@
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# variables
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TARGET = ACT-34B
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PIC = 12f617
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# software verion used:
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# pk2cmd: 1.21
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# sdcc: 3.4.0
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# gputils: 1.3.0
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all: off flash on
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# flash program
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flash: $(TARGET).hex
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pk2cmd -PPIC$(PIC) -F$< -M
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# power on remote
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on:
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pk2cmd -PPIC$(PIC) -T
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# power off remote
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off:
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pk2cmd -PPIC$(PIC) -V0
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# compile program
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compile: $(TARGET).hex
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# compile program C source code (includes a default code)
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$(TARGET).hex: $(TARGET).c
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sdcc --std-c99 --opt-code-size --use-non-free -mpic14 -p$(PIC) $<
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# remove temporary files
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clean:
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rm -f $(TARGET).hex $(TARGET).lst $(TARGET).asm $(TARGET).adb $(TARGET).o $(TARGET).cod
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