From 7772ea4579a45bcf63ebd5e68be66ba1a9c72dfa Mon Sep 17 00:00:00 2001
From: Clyne Sullivan <tullivan99@gmail.com>
Date: Fri, 11 Nov 2016 15:02:17 -0500
Subject: chibios!

---
 .../testhal/STM32/STM32F37x/PWM-ICU/main.c         | 141 +++++++++++++++++++++
 1 file changed, 141 insertions(+)
 create mode 100644 ChibiOS_16.1.5/testhal/STM32/STM32F37x/PWM-ICU/main.c

(limited to 'ChibiOS_16.1.5/testhal/STM32/STM32F37x/PWM-ICU/main.c')

diff --git a/ChibiOS_16.1.5/testhal/STM32/STM32F37x/PWM-ICU/main.c b/ChibiOS_16.1.5/testhal/STM32/STM32F37x/PWM-ICU/main.c
new file mode 100644
index 0000000..bb23765
--- /dev/null
+++ b/ChibiOS_16.1.5/testhal/STM32/STM32F37x/PWM-ICU/main.c
@@ -0,0 +1,141 @@
+/*
+    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 void pwmpcb(PWMDriver *pwmp) {
+
+  (void)pwmp;
+  palClearPad(GPIOC, GPIOC_LED1);
+}
+
+static void pwmc1cb(PWMDriver *pwmp) {
+
+  (void)pwmp;
+  palSetPad(GPIOC, GPIOC_LED1);
+}
+
+static PWMConfig pwmcfg = {
+  10000,                                    /* 10kHz PWM clock frequency.   */
+  10000,                                    /* Initial PWM period 1S.       */
+  pwmpcb,
+  {
+   {PWM_OUTPUT_ACTIVE_LOW, pwmc1cb},
+   {PWM_OUTPUT_DISABLED, NULL},
+   {PWM_OUTPUT_DISABLED, NULL},
+   {PWM_OUTPUT_DISABLED, NULL}
+  },
+  0,
+  0
+};
+
+icucnt_t last_width, last_period;
+
+static void icuwidthcb(ICUDriver *icup) {
+
+  palSetPad(GPIOC, GPIOC_LED2);
+  last_width = icuGetWidthX(icup);
+}
+
+static void icuperiodcb(ICUDriver *icup) {
+
+  palClearPad(GPIOC, GPIOC_LED2);
+  last_period = icuGetPeriodX(icup);
+}
+
+static ICUConfig icucfg = {
+  ICU_INPUT_ACTIVE_LOW,
+  10000,                                    /* 10kHz ICU clock frequency.   */
+  icuwidthcb,
+  icuperiodcb,
+  NULL,
+  ICU_CHANNEL_1,
+  0
+};
+
+/*
+ * 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();
+
+  /*
+   * Initializes the PWM driver 5 and ICU driver 3.
+   * GPIOC0 is the PWM output.
+   * GPIOC6 is the ICU input.
+   * The two pins have to be externally connected together.
+   */
+  pwmStart(&PWMD5, &pwmcfg);
+  pwmEnablePeriodicNotification(&PWMD5);
+  palSetPadMode(GPIOC, 0, PAL_MODE_ALTERNATE(2));
+  icuStart(&ICUD3, &icucfg);
+  palSetPadMode(GPIOC, 6, PAL_MODE_ALTERNATE(2));
+  icuStartCapture(&ICUD3);
+  icuEnableNotifications(&ICUD3);
+  chThdSleepMilliseconds(2000);
+
+  /*
+   * Starts the PWM channel 0 using 75% duty cycle.
+   */
+  pwmEnableChannel(&PWMD5, 0, PWM_PERCENTAGE_TO_WIDTH(&PWMD5, 7500));
+  pwmEnableChannelNotification(&PWMD5, 0);
+  chThdSleepMilliseconds(5000);
+
+  /*
+   * Changes the PWM channel 0 to 50% duty cycle.
+   */
+  pwmEnableChannel(&PWMD5, 0, PWM_PERCENTAGE_TO_WIDTH(&PWMD5, 5000));
+  chThdSleepMilliseconds(5000);
+
+  /*
+   * Changes the PWM channel 0 to 25% duty cycle.
+   */
+  pwmEnableChannel(&PWMD5, 0, PWM_PERCENTAGE_TO_WIDTH(&PWMD5, 2500));
+  chThdSleepMilliseconds(5000);
+
+  /*
+   * Changes PWM period to half second the duty cycle becomes 50%
+   * implicitly.
+   */
+  pwmChangePeriod(&PWMD5, 5000);
+  chThdSleepMilliseconds(5000);
+
+  /*
+   * Disables channel 0 and stops the drivers.
+   */
+  pwmDisableChannel(&PWMD5, 0);
+  pwmStop(&PWMD5);
+  icuStopCapture(&ICUD3);
+  icuStop(&ICUD3);
+
+  /*
+   * Normal main() thread activity, in this demo it does nothing.
+   */
+  while (true) {
+    chThdSleepMilliseconds(500);
+  }
+  return 0;
+}
-- 
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