40 lines
2.9 KiB
HTML
40 lines
2.9 KiB
HTML
|
<html>
|
||
|
|
<head>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1">
|
||
|
|
<title>
|
||
|
|
xttcps v2_0
|
||
|
|
</title>
|
||
|
|
<link href="$DriverApiDocsCssPath" rel="stylesheet" type="text/css">
|
||
|
|
</head>
|
||
|
|
<h3 class="PageHeader">Xilinx Processor IP Library</h3>
|
||
|
|
<hl>Software Drivers</hl>
|
||
|
|
<hr class="whs1">
|
||
|
|
<!-- Generated by Doxygen 1.4.5 -->
|
||
|
|
<div class="tabs">
|
||
|
|
<ul>
|
||
|
|
<li id="current"><a href="index.html"><span>Main Page</span></a></li>
|
||
|
|
<li><a href="annotated.html"><span>Classes</span></a></li>
|
||
|
|
<li><a href="files.html"><span>Files</span></a></li>
|
||
|
|
</ul></div>
|
||
|
|
<h1>xttcps v2_0</h1>
|
||
|
|
<p>
|
||
|
|
This is the driver for one 16-bit timer counter in the Triple Timer Counter (TTC) module in the Ps block.<p>
|
||
|
|
The TTC module provides three independent timer/counter modules that can each be clocked using either the system clock (pclk) or an externally driven clock (ext_clk). In addition, each counter can independently prescale its selected clock input (divided by 2 to 65536). Counters can be set to decrement or increment.<p>
|
||
|
|
Each of the counters can be programmed to generate interrupt pulses: . At a regular, predefined period, that is on a timed interval . When the counter registers overflow . When the count matches any one of the three 'match' registers<p>
|
||
|
|
Therefore, up to six different events can trigger a timer interrupt: three match interrupts, an overflow interrupt, an interval interrupt and an event timer interrupt. Note that the overflow interrupt and the interval interrupt are mutually exclusive.<p>
|
||
|
|
<b>Initialization & Configuration</b><p>
|
||
|
|
An <a class="el" href="struct_x_ttc_ps___config.html">XTtcPs_Config</a> structure is used to configure a driver instance. Information in the <a class="el" href="struct_x_ttc_ps___config.html">XTtcPs_Config</a> structure is the hardware properties about the device.<p>
|
||
|
|
A driver instance is initialized through XTtcPs_CfgInitialize(InstancePtr, CfgPtr, EffectiveAddr). Where CfgPtr is a pointer to the <a class="el" href="struct_x_ttc_ps___config.html">XTtcPs_Config</a> structure, it can be looked up statically through XTtcPs_LookupConfig(DeviceID), or passed in by the caller. The EffectiveAddr can be the static base address of the device or virtual mapped address if address translation is supported.<p>
|
||
|
|
<b>Interrupts</b><p>
|
||
|
|
Interrupt handler is not provided by the driver, as handling of interrupt is application specific.<p>
|
||
|
|
<dl compact><dt><b>Note:</b></dt><dd>The default setting for a timer/counter is:<ul>
|
||
|
|
<li>Overflow Mode</li><li>Internal clock (pclk) selected</li><li>Counter disabled</li><li>All Interrupts disabled</li><li>Output waveforms disabled</li></ul>
|
||
|
|
</dd></dl>
|
||
|
|
<pre>
|
||
|
|
MODIFICATION HISTORY:</pre><p>
|
||
|
|
<pre> Ver Who Date Changes
|
||
|
|
----- ------ -------- -----------------------------------------------------
|
||
|
|
1.00a drg/jz 01/20/10 First release..
|
||
|
|
2.0 adk 12/10/13 Updated as per the New Tcl API's</pre><p>
|
||
|
|
<pre> </pre> Copyright @ 1995-2014 Xilinx, Inc. All rights reserved.
|