Made a mostly-working remote control translator

It looks for the signal sent by the MINIX remote's power button and
sends the one sent by the GO.VIDEO remote's power button.  It has a few
reliability problems and the code's a bit of a mess, so there's still
work to do.

halconf.h

  * @brief   Enables the ICU subsystem.
  */
 #if !defined(HAL_USE_ICU) || defined(__DOXYGEN__)
-#define HAL_USE_ICU                 FALSE
+#define HAL_USE_ICU                 TRUE
 #endif
 
 /**

mcuconf.h

  */
 #define STM32_ICU_USE_TIM1                  FALSE
 #define STM32_ICU_USE_TIM2                  FALSE
-#define STM32_ICU_USE_TIM3                  FALSE
+#define STM32_ICU_USE_TIM3                  TRUE
 #define STM32_ICU_USE_TIM4                  FALSE
 #define STM32_ICU_USE_TIM5                  FALSE
 #define STM32_ICU_USE_TIM8                  FALSE

src/main.c

  * 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
 
     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"
 
+static event_listener_t el;
+static event_source_t IR_receiver;
+/*===========================================================================*/
+/* IR remote related code.                                                   */
+/*===========================================================================*/
+
+#define DELTA          5
+#define START_PULSE    45
+#define END_PULSE      405
+#define RPT_CMD_PULSE  959
+#define ZERO_PULSE     6
+#define ONE_PULSE      17
+#define COMMA_PULSE    23
+
 /* PWM configuration for IR output */
 static PWMConfig pwmcfg = {
     380000, /* 380 kHz PWM clock frequency. */
   0, 0
 };
 
+/*===========================================================================*/
+/* ICU related code.                                                         */
+/*===========================================================================*/
+static int32_t index = -1;
+static bool START_OCCURED = FALSE, REPEAT_FLAG = FALSE;
+static uint32_t tmp, command;
+static void icuwidthcb(ICUDriver *icup) {
+
+  icucnt_t cnt = icuGetWidthX(icup);
+  if((cnt > (START_PULSE - DELTA)) && (cnt < (START_PULSE + DELTA))){
+    index = 0;
+    START_OCCURED = TRUE;
+  }
+  else if((cnt > (ONE_PULSE - DELTA)) && (cnt < (ONE_PULSE + DELTA))){
+    tmp |= 1 << (31 - index);
+    index++;
+  }
+  else if((cnt > (ZERO_PULSE - DELTA)) && (cnt < (ZERO_PULSE + DELTA))){
+    tmp &= ~(1 << (31 - index));
+    index++;
+  }
+  else if((cnt > (END_PULSE - 4*DELTA)) && (cnt < (END_PULSE + 4*DELTA))){
+    if((START_OCCURED) && (index == 32)) {
+      command = tmp;
+    } else {
+      command = 0;
+    }
+    REPEAT_FLAG = FALSE;
+    START_OCCURED = FALSE;
+    index = -1;
+  }
+  else if((cnt > (RPT_CMD_PULSE - DELTA)) && (cnt < (RPT_CMD_PULSE + DELTA))){
+    REPEAT_FLAG = TRUE;
+  }
+  else if((cnt > (COMMA_PULSE - DELTA)) && (cnt < (COMMA_PULSE + DELTA))){
+    chEvtBroadcastFlags(&IR_receiver, 0);
+  }
+  else{
+    /* Long dead pulse nothing to do */
+  }
+}
+
+static ICUConfig icucfg = {
+  ICU_INPUT_ACTIVE_HIGH,
+  10000,            /* 10kHz ICU clock frequency. */
+  icuwidthcb,
+  NULL,
+  NULL,
+  ICU_CHANNEL_1,
+  0
+};
+
 /*
  * Green LED blinker thread, times are in milliseconds.
  */
     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);
+
     /*
      * Creates the blinker thread.
      */
-    chThdCreateStatic(waThread1, sizeof(waThread1), NORMALPRIO, Thread1, NULL);
+    //chThdCreateStatic(waThread1, sizeof(waThread1), NORMALPRIO, Thread1, NULL);
 
     /* Configure PWM */
     pwmStart(&PWMD1, &pwmcfg);
 
     /* Send a continuous stream of power off signals to the TV */
     while (true) {
-        rc5_frame(false, 0x00, 0x0C);
-
-        chThdSleepMilliseconds(90);
+        if (command == 0x807F18E7) {
+            if (chEvtWaitAnyTimeout(ALL_EVENTS, MS2ST(200))) {
+                continue;
+            }
+            palClearPad(GPIOC, GPIOC_LED);
+            for (int i = 0; i < 3; i++) {
+                rc5_frame(false, 0x00, 0x0C);
+                chThdSleepMilliseconds(90);
+            }
+            palSetPad(GPIOC, GPIOC_LED);
+        }
+        chEvtWaitAny(ALL_EVENTS);
     }
 }