<?xml version="1.0" encoding="ANSI_X3.4-1968" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>Device ready function</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="MTD NAND Driver Programming Interface" /><link rel="up" href="ch04.html" title="Chapter 4. Basic board driver" /><link rel="prev" href="ch04s03.html" title="Hardware control function" /><link rel="next" href="ch04s05.html" title="Init function" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Device ready function</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch04s03.html">Prev</a> </td><th width="60%" align="center">Chapter 4. Basic board driver</th><td width="20%" align="right"> <a accesskey="n" href="ch04s05.html">Next</a></td></tr></table><hr /></div><div class="sect1" title="Device ready function"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="Device_ready_function"></a>Device ready function</h2></div></div></div><p> If the hardware interface has the ready busy pin of the NAND chip connected to a GPIO or other accesible I/O pin, this function is used to read back the state of the pin. The function has no arguments and should return 0, if the device is busy (R/B pin is low) and 1, if the device is ready (R/B pin is high). If the hardware interface does not give access to the ready busy pin, then the function must not be defined and the function pointer this->dev_ready is set to NULL. </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch04s03.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch04.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ch04s05.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Hardware control function </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Init function</td></tr></table></div></body></html>
