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- /*
- * Remote Control Translator Firmware
- * Copyright (C) 2017 Clayton G. Hobbs <clay@lakeserv.net>
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
- /* Portions subject to the following copyright notices */
-
- /*
- ChibiOS - Copyright (C) 2006..2016 Giovanni Di Sirio
-
- Licensed under the Apache License, Version 2.0 (the "License");
- you may not use this file except in compliance with the License.
- You may obtain a copy of the License at
-
- http://www.apache.org/licenses/LICENSE-2.0
-
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
- */
-
- /*
- PLAY Embedded demos - Copyright (C) 2014-2017 Rocco Marco Guglielmi
-
- This file is part of PLAY Embedded demos.
-
- Licensed under the Apache License, Version 2.0 (the "License");
- you may not use this file except in compliance with the License.
- You may obtain a copy of the License at
-
- http://www.apache.org/licenses/LICENSE-2.0
-
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
- */
-
- #include <stdbool.h>
-
- #include "ch.h"
- #include "hal.h"
-
-
- /*
- * RC5 timing macros (microseconds, unless otherwise specified)
- */
- #define RC5_PULSE_LENGTH 889
- #define RC5_CODE_SPACE_MS 90 /* Milliseconds */
-
- /*
- * NEC timing macros (tenths of a millisecond)
- */
- #define NEC_START_PULSE 45
- #define NEC_END_PULSE 405
- #define NEC_RPT_CMD_PULSE 962
- #define NEC_ZERO_PULSE 6
- #define NEC_ONE_PULSE 17
- #define NEC_COMMA_PULSE 23
-
- /* Tolerance */
- #define NEC_DELTA 5
- #define CLOSE_TO(var, target, error) (((var) > ((target) - (error))) && ((var) < ((target) + (error))))
-
-
- static event_listener_t el;
- static event_source_t IR_receiver;
-
- /* PWM configuration for IR output */
- static PWMConfig pwmcfg = {
- 380000, /* 380 kHz PWM clock frequency */
- 10, /* PWM period 10 clock cycles */
- NULL,
- {
- {PWM_OUTPUT_ACTIVE_HIGH, NULL},
- {PWM_OUTPUT_DISABLED, NULL},
- {PWM_OUTPUT_DISABLED, NULL},
- {PWM_OUTPUT_DISABLED, NULL}
- },
- 0,
- 0
- };
-
- /* Timer configuration for IR output */
- static const GPTConfig gpt4cfg = {
- 1000000, /* 1 MHz timer clock */
- NULL, /* No callback */
- 0, 0
- };
-
-
- /*
- * Variables for holding the most recently read information from nec_icuwidthcb
- */
- static uint8_t nec_addr, nec_data;
- static bool nec_repeat = false;
-
- /*
- * ICU pulse width callback for reading NEC remote control frames
- */
- static void nec_icuwidthcb(ICUDriver *icup)
- {
- static int32_t index = -1;
- static bool start_occured = false;
- static uint32_t tmp;
-
- icucnt_t cnt = icuGetWidthX(icup);
- if (CLOSE_TO(cnt, NEC_START_PULSE, NEC_DELTA)) {
- index = 0;
- start_occured = true;
- } else if (CLOSE_TO(cnt, NEC_ONE_PULSE, NEC_DELTA)) {
- if (index > -1) {
- tmp |= 1 << (31 - index);
- index++;
- }
- } else if (CLOSE_TO(cnt, NEC_ZERO_PULSE, NEC_DELTA)) {
- if (index > -1) {
- tmp &= ~(1 << (31 - index));
- index++;
- }
- } else if (CLOSE_TO(cnt, NEC_END_PULSE, 4*NEC_DELTA)) {
- /* Nothing to do here */
- } else if (CLOSE_TO(cnt, NEC_RPT_CMD_PULSE, 9*NEC_DELTA)) {
- /* Nothing to do here */
- } else if (CLOSE_TO(cnt, NEC_COMMA_PULSE, NEC_DELTA)) {
- nec_repeat = true;
- chEvtBroadcastFlags(&IR_receiver, 0);
- } else {
- /* When an unknown symbol is seen, forget what we've read */
- nec_addr = 0;
- nec_data = 0;
- nec_repeat = false;
- start_occured = false;
- index = -1;
- }
-
- /* If we've read a whole message, send it on */
- if (start_occured && index == 32) {
- nec_addr = (tmp >> 24) & 0xFF;
- nec_data = (tmp >> 8) & 0xFF;
- nec_repeat = false;
- start_occured = false;
- index = -1;
- chEvtBroadcastFlags(&IR_receiver, 0);
- }
- }
-
- /* Configuration for the ICU */
- static ICUConfig icucfg = {
- ICU_INPUT_ACTIVE_HIGH,
- 10000, /* 10kHz ICU clock frequency. */
- nec_icuwidthcb,
- NULL,
- NULL,
- ICU_CHANNEL_1,
- 0
- };
-
-
- /*
- * Synchronously send one bit for RC5
- */
- void rc5_bit(bool bit)
- {
- if (bit) {
- pwmDisableChannel(&PWMD1, 0);
- gptPolledDelay(&GPTD4, RC5_PULSE_LENGTH);
- pwmEnableChannel(&PWMD1, 0, PWM_PERCENTAGE_TO_WIDTH(&PWMD1, 5000));
- gptPolledDelay(&GPTD4, RC5_PULSE_LENGTH);
- } else {
- pwmEnableChannel(&PWMD1, 0, PWM_PERCENTAGE_TO_WIDTH(&PWMD1, 5000));
- gptPolledDelay(&GPTD4, RC5_PULSE_LENGTH);
- pwmDisableChannel(&PWMD1, 0);
- gptPolledDelay(&GPTD4, RC5_PULSE_LENGTH);
- }
- }
-
- /*
- * Synchronously send a whole RC5 frame
- */
- void rc5_frame(bool toggle, int addr, int data)
- {
- /* Start */
- rc5_bit(1);
- rc5_bit(1);
- /* Toggle */
- rc5_bit(toggle);
- /* Address */
- for (int b = 0x10; b != 0; b >>= 1) {
- rc5_bit(addr & b);
- }
- /* Data */
- for (int b = 0x20; b != 0; b >>= 1) {
- rc5_bit(data & b);
- }
- }
-
-
- /*
- * Application entry point.
- */
- int main(void)
- {
- /*
- * System initializations.
- * - HAL initialization, this also initializes the configured device drivers
- * and performs the board-specific initializations.
- * - Kernel initialization, the main() function becomes a thread and the
- * RTOS is active.
- */
- halInit();
- chSysInit();
-
- chEvtObjectInit(&IR_receiver);
- chEvtRegister(&IR_receiver, &el, 0);
- /*
- * Initializes the ICU driver 3.
- * GPIOC6 is the ICU input.
- * The two pins have to be externally connected together.
- */
- sdStart(&SD2, NULL);
- icuStart(&ICUD3, &icucfg);
- palSetPadMode(GPIOA, 6, PAL_MODE_INPUT_PULLDOWN);
- icuStartCapture(&ICUD3);
- icuEnableNotifications(&ICUD3);
-
- /* Configure PWM */
- pwmStart(&PWMD1, &pwmcfg);
- palSetPadMode(GPIOA, 8, PAL_MODE_STM32_ALTERNATE_PUSHPULL);
-
- /* Configure GPT */
- gptStart(&GPTD4, &gpt4cfg);
-
- while (true) {
- /* Wait for a signal */
- chEvtWaitAny(ALL_EVENTS);
-
- /* If an NEC power signal was received */
- if (nec_addr == 0x80 && nec_data == 0x18) {
- /* Turn on the LED */
- palClearPad(GPIOC, GPIOC_LED);
-
- /* Wait until further codes stop arriving to avoid interfering */
- while (chEvtWaitAnyTimeout(ALL_EVENTS, MS2ST(200)))
- ;
-
- /* Send the RC5 power signal */
- for (int i = 0; i < 3; i++) {
- rc5_frame(false, 0x00, 0x0C);
- chThdSleepMilliseconds(RC5_CODE_SPACE_MS);
- }
-
- /* Turn off the LED */
- palSetPad(GPIOC, GPIOC_LED);
- }
- }
- }
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