From 499335cd61ae6daadf828b2ab2b3f8b40c0f7c03 Mon Sep 17 00:00:00 2001
From: Fabien Poussin <fabien.poussin@gmail.com>
Date: Tue, 16 Feb 2016 00:51:22 +0100
Subject: TIMCAP: Initial commit

---
 testhal/STM32/STM32F3xx/TIMCAP/main.c | 194 ++++++++++++++++++++++++++++++++++
 1 file changed, 194 insertions(+)
 create mode 100644 testhal/STM32/STM32F3xx/TIMCAP/main.c

(limited to 'testhal/STM32/STM32F3xx/TIMCAP/main.c')

diff --git a/testhal/STM32/STM32F3xx/TIMCAP/main.c b/testhal/STM32/STM32F3xx/TIMCAP/main.c
new file mode 100644
index 0000000..dd91924
--- /dev/null
+++ b/testhal/STM32/STM32F3xx/TIMCAP/main.c
@@ -0,0 +1,194 @@
+/*
+    ChibiOS - Copyright (C) 2006..2015 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.
+*/
+
+#include "ch.h"
+#include "hal.h"
+
+
+static uint8_t TIM3CC1CaptureNumber, TIM3CC2CaptureNumber;
+static uint16_t TIM3CC1ReadValue1, TIM3CC1ReadValue2;
+static uint16_t TIM3CC2ReadValue1, TIM3CC2ReadValue2;
+static bool TIM3CC1UD, TIM3CC2UD;
+
+static uint16_t freq1, freq2;
+
+
+void reEnableInputCapture(TIMCAPDriver *timcapp)
+{
+
+  if ((timcapp->tim->DIER & TIM_DIER_CC1IE) == 0)
+  {
+    TIM3CC1CaptureNumber = 0;
+    TIM3CC1UD = false;
+    timcapp->tim->DIER |= TIM_DIER_CC1IE;
+  }
+
+  if ((timcapp->tim->DIER & TIM_DIER_CC2IE) == 0)
+  {
+    TIM3CC2CaptureNumber = 0;
+    TIM3CC2UD = false;
+    timcapp->tim->DIER |= TIM_DIER_CC2IE;
+  }
+
+}
+
+void captureOverflowCb(TIMCAPDriver *timcapp)
+{
+  if (TIM3CC1UD && (timcapp->tim->DIER & TIM_DIER_CC1IE))
+  {
+    timcapp->tim->DIER &= ~TIM_DIER_CC1IE;
+    freq1 = 0;
+  }
+
+  if (TIM3CC2UD && (timcapp->tim->DIER & TIM_DIER_CC2IE))
+  {
+    timcapp->tim->DIER &= ~TIM_DIER_CC2IE;
+    freq2 = 0;
+  }
+
+  TIM3CC1UD = true;
+  TIM3CC2UD = true;
+}
+
+void capture1Cb(TIMCAPDriver *timcapp)
+{
+  if(TIM3CC1CaptureNumber == 0)
+  {
+    /* Get the Input Capture value */
+    TIM3CC1ReadValue1 = timcapp->tim->CCR[0];
+    TIM3CC1CaptureNumber = 1;
+    TIM3CC1UD = false;
+  }
+  else if(TIM3CC1CaptureNumber == 1)
+  {
+      uint32_t Capture;
+      /* Get the Input Capture value */
+      TIM3CC1ReadValue2 = timcapp->tim->CCR[0];
+      TIM3CC1UD = false;
+
+      /* Capture computation */
+      if (TIM3CC1ReadValue2 > TIM3CC1ReadValue1)
+      {
+          Capture = ((uint32_t)TIM3CC1ReadValue2 - (uint32_t)TIM3CC1ReadValue1);
+      }
+      else
+      {
+          Capture = (((uint32_t)TIM3CC1ReadValue2 + 0x10000) - (uint32_t)TIM3CC1ReadValue1);
+      }
+
+      /* Frequency computation */
+      freq1 = (timcapp->config->frequency / Capture);
+
+      TIM3CC1ReadValue1 = TIM3CC1ReadValue2;
+      TIM3CC1CaptureNumber = 0;
+
+      /* Disable CC1 interrupt */
+      timcapp->tim->DIER &= ~TIM_DIER_CC1IE;
+  }
+}
+
+void capture2Cb(TIMCAPDriver *timcapp)
+{
+  if(TIM3CC2CaptureNumber == 0)
+  {
+    /* Get the Input Capture value */
+    TIM3CC2ReadValue1 = timcapp->tim->CCR[1];
+    TIM3CC2CaptureNumber = 1;
+    TIM3CC2UD = false;
+  }
+  else if(TIM3CC2CaptureNumber == 1)
+  {
+      uint32_t Capture;
+      /* Get the Input Capture value */
+      TIM3CC2ReadValue2 = timcapp->tim->CCR[1];
+      TIM3CC2UD = false;
+
+      /* Capture computation */
+      if (TIM3CC2ReadValue2 > TIM3CC2ReadValue1)
+      {
+          Capture = ((uint32_t)TIM3CC2ReadValue2 - (uint32_t)TIM3CC2ReadValue1);
+      }
+      else
+      {
+          Capture = (((uint32_t)TIM3CC2ReadValue2 + 0x10000) - (uint32_t)TIM3CC2ReadValue1);
+      }
+
+      /* Frequency computation */
+      freq2 = (timcapp->config->frequency / Capture);
+
+      TIM3CC2ReadValue1 = TIM3CC2ReadValue2;
+      TIM3CC2CaptureNumber = 0;
+
+      /* Disable CC2 interrupt */
+      timcapp->tim->DIER &= ~TIM_DIER_CC2IE;
+  }
+}
+
+TIMCAPConfig tc_conf = {
+   {TIMCAP_INPUT_ACTIVE_HIGH,
+    TIMCAP_INPUT_ACTIVE_HIGH,
+    TIMCAP_INPUT_DISABLED,
+    TIMCAP_INPUT_DISABLED},
+   200000, /* TIM3 Runs at 36Mhz max. (1/200000)*65536 = 0.32s Max, 3.12Hz Min */
+   {capture1Cb, capture2Cb, NULL, NULL},
+   captureOverflowCb,
+   0,
+   0
+};
+
+THD_WORKING_AREA(waThreadTimcap, 256);
+static THD_FUNCTION(ThreadTimcap, arg)
+{
+  (void)arg;
+
+  while (TRUE)
+  {
+
+    reEnableInputCapture(&TIMCAPD3);
+    chThdSleepMilliseconds(200);
+  }
+
+  return;
+}
+
+/*
+ * 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();
+
+  timcapStart(&TIMCAPD3, &tc_conf);
+
+  chThdCreateStatic(waThreadTimcap, sizeof(waThreadTimcap), NORMALPRIO, ThreadTimcap, NULL);
+
+  /*
+   * Normal main() thread activity, it resets the watchdog.
+   */
+  while (true) {
+    palToggleLine(LINE_LED4_BLUE);
+    chThdSleepMilliseconds(500);
+  }
+  return 0;
+}
-- 
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