From c8da1c3b7b6eb450138a00af9bbbee607f596837 Mon Sep 17 00:00:00 2001
From: Marti Bolivar <mbolivar@leaflabs.com>
Date: Mon, 7 Mar 2011 13:11:54 -0500
Subject: [WIP] GPIO refactor: seems ok, ready for review

---
 wirish/pwm.cpp | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 wirish/pwm.cpp

(limited to 'wirish/pwm.cpp')

diff --git a/wirish/pwm.cpp b/wirish/pwm.cpp
new file mode 100644
index 0000000..072e4cd
--- /dev/null
+++ b/wirish/pwm.cpp
@@ -0,0 +1,48 @@
+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2010 Perry Hung.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *****************************************************************************/
+
+/**
+ *  @brief Arduino-compatible PWM implementation.
+ */
+
+#include "wirish.h"
+#include "timers.h"
+#include "io.h"
+#include "pwm.h"
+
+void pwmWrite(uint8 pin, uint16 duty_cycle) {
+    TimerCCR ccr;
+
+    if (pin >= NR_GPIO_PINS) {
+        return;
+    }
+
+    ccr = PIN_MAP[pin].timer_ccr;
+
+    if (ccr == 0) {
+        return;
+    }
+
+    timer_pwm_write_ccr(ccr, duty_cycle);
+}
-- 
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