From: Kevin Townsend <kevin@ktownsend.com>
Date: Mon, 14 May 2012 11:56:01 +0000 (+0200)
Subject: First commit
X-Git-Url: http://git.rohieb.name/hackover2013-badge-firmware.git/commitdiff_plain/75a91edd2e78b65caf10a5f84e4c9c033f2773e2?hp=4cff87eb77d0733b5e9e38d5f42314c2bb8abf99

First commit
---

diff --git a/tools/validation/startupdelay/StartupTime_CrossworksForARM.png b/tools/validation/startupdelay/StartupTime_CrossworksForARM.png
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diff --git a/tools/validation/startupdelay/StartupTime_GCCMakefile.png b/tools/validation/startupdelay/StartupTime_GCCMakefile.png
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diff --git a/tools/validation/startupdelay/abstract.txt b/tools/validation/startupdelay/abstract.txt
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+++ b/tools/validation/startupdelay/abstract.txt
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+This simple code can be used to test the startup delay, or more precisely
+the delay between the moment that reset is deasserted and code execution
+begins in main().
+
+GPIO pin 2.1 is set to output and high as soon as main is entered, so you
+simply need to monitor the reset line and GPIO 2.1 on a two-channel
+oscilliloscope, and measure the delay between the two rising edges.
\ No newline at end of file
diff --git a/tools/validation/startupdelay/main.c b/tools/validation/startupdelay/main.c
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+++ b/tools/validation/startupdelay/main.c
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+/**************************************************************************/
+/*! 
+    @file     main.c
+    @author   K. Townsend (microBuilder.eu)
+
+    @section LICENSE
+
+    Software License Agreement (BSD License)
+
+    Copyright (c) 2011, microBuilder SARL
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are met:
+    1. Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+    3. Neither the name of the copyright holders nor the
+    names of its contributors may be used to endorse or promote products
+    derived from this software without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
+    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
+    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+    ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+/**************************************************************************/
+#include "projectconfig.h"
+
+#include "core/gpio/gpio.h"
+
+/**************************************************************************/
+/*! 
+    As soon as the chip comes out of reset and the startup code has
+    finished executing, sets up GPIO pin 2.1 as an ouput and high.
+
+    This can be used to determine the startup delay, by measuring the
+    time between reset be deasserted and the GPIO pin going high, minus
+    the GPIO overhead of a few clock cycles.
+
+    HW Setup: Set channel one of the oscilliscope to the reset pin, and
+              channel two of the oscilliscope to GPIO pin 2.1.
+
+              Set a trigger on the rising edge of the reset pin, and
+              measure the delay between the rising edge of reset and the
+              rising edge of GPIO 2.1.
+*/
+/**************************************************************************/
+int main(void)
+{
+  /* Enable AHB clock to the GPIO domain. */
+  SCB_SYSAHBCLKCTRL |= (SCB_SYSAHBCLKCTRL_GPIO);
+
+  /* Set 2.1 to output and high */
+  GPIO_GPIO2DIR  |= (1 << 1);    // pin 1 = Output
+  GPIO_GPIO2DATA |= (1 << 1);    // pin 1 = High
+
+  while(1)
+  {
+  }
+
+  return 0;
+}