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📁 1、程序目的:介绍AT91SAM7S256-EK TWI的基本用法: 2、 功能说明:通过TWI实现I2C
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<body><pre><font color=#B22222>//  ----------------------------------------------------------------------------</font>
<font color=#B22222>//          ATMEL Microcontroller Software Support  -  ROUSSET  -</font>
<font color=#B22222>//  ----------------------------------------------------------------------------</font>
<font color=#B22222>//  DISCLAIMER:  THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR</font>
<font color=#B22222>//  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF</font>
<font color=#B22222>//  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE</font>
<font color=#B22222>//  DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,</font>
<font color=#B22222>//  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT</font>
<font color=#B22222>//  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,</font>
<font color=#B22222>//  OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF</font>
<font color=#B22222>//  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING</font>
<font color=#B22222>//  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,</font>
<font color=#B22222>//  EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</font>
<font color=#B22222>//  ----------------------------------------------------------------------------</font>
<font color=#B22222>// File Name           : AT91SAM7A3.h</font>
<font color=#B22222>// Object              : AT91SAM7A3 definitions</font>
<font color=#B22222>// Generated           : AT91 SW Application Group  03/21/2005 (10:39:14)</font>
<font color=#B22222>// </font>
<font color=#B22222>// CVS Reference       : /AT91SAM7A3.pl/1.25/Mon Mar 14 12:46:23 2005//</font>
<font color=#B22222>// CVS Reference       : /SYS_SAM7A3.pl/1.7/Thu Feb  3 17:18:25 2005//</font>
<font color=#B22222>// CVS Reference       : /MC_SAM7A3.pl/1.1/Thu Feb  3 17:02:04 2005//</font>
<font color=#B22222>// CVS Reference       : /PMC_SAM7A3.pl/1.2/Tue Feb  8 13:58:44 2005//</font>
<font color=#B22222>// CVS Reference       : /RSTC_SAM7A3.pl/1.1/Thu Feb  3 16:56:45 2005//</font>
<font color=#B22222>// CVS Reference       : /SHDWC_SAM7A3.pl/1.1/Thu Feb  3 16:25:23 2005//</font>
<font color=#B22222>// CVS Reference       : /AIC_6075A.pl/1.1/Fri Jun 28 10:36:48 2002//</font>
<font color=#B22222>// CVS Reference       : /PIO_6057A.pl/1.2/Thu Feb  3 10:18:28 2005//</font>
<font color=#B22222>// CVS Reference       : /RTTC_6081A.pl/1.2/Tue Nov  9 14:43:58 2004//</font>
<font color=#B22222>// CVS Reference       : /PITC_6079A.pl/1.2/Tue Nov  9 14:43:56 2004//</font>
<font color=#B22222>// CVS Reference       : /WDTC_6080A.pl/1.3/Tue Nov  9 14:44:00 2004//</font>
<font color=#B22222>// CVS Reference       : /PDC_6074C.pl/1.2/Thu Feb  3 08:48:54 2005//</font>
<font color=#B22222>// CVS Reference       : /DBGU_6059D.pl/1.1/Mon Jan 31 13:15:32 2005//</font>
<font color=#B22222>// CVS Reference       : /SPI_6088D.pl/1.2/Mon Feb 14 07:24:18 2005//</font>
<font color=#B22222>// CVS Reference       : /US_6089C.pl/1.1/Mon Jul 12 18:23:26 2004//</font>
<font color=#B22222>// CVS Reference       : /SSC_6078A.pl/1.1/Tue Jul 13 07:45:40 2004//</font>
<font color=#B22222>// CVS Reference       : /TWI_6061A.pl/1.1/Tue Jul 13 07:38:06 2004//</font>
<font color=#B22222>// CVS Reference       : /PWM_6044D.pl/1.1/Tue Apr 27 14:53:52 2004//</font>
<font color=#B22222>// CVS Reference       : /UDP_6083C.pl/1.1/Mon Jan 31 13:01:46 2005//</font>
<font color=#B22222>// CVS Reference       : /TC_6082A.pl/1.7/Fri Mar 11 12:52:17 2005//</font>
<font color=#B22222>// CVS Reference       : /CAN_6019B.pl/1.1/Tue Mar  8 12:42:22 2005//</font>
<font color=#B22222>// CVS Reference       : /MCI_6101A.pl/1.1/Tue May 18 13:48:46 2004//</font>
<font color=#B22222>// CVS Reference       : /ADC_6051C.pl/1.1/Fri Oct 17 09:12:38 2003//</font>
<font color=#B22222>// CVS Reference       : /AES_6149A.pl/1.10/Mon Feb  7 09:44:25 2005//</font>
<font color=#B22222>// CVS Reference       : /DES3_6150A.pl/1.1/Mon Jan 17 08:34:31 2005//</font>
<font color=#B22222>//  ----------------------------------------------------------------------------</font>

<font color=#008200>#ifndef</font> AT91SAM7A3_H
<font color=#008200>#define</font> AT91SAM7A3_H

<font color=#0000FF>typedef</font> <font color=#0000FF>volatile</font> <font color=#0000FF>unsigned</font> <font color=#0000FF>int</font> <b><a name="AT91_REG">AT91_REG</a></b>;<font color=#B22222>// Hardware <font color=#0000FF>register</font> definition</font>

<font color=#B22222>// *****************************************************************************</font>
<font color=#B22222>//              SOFTWARE API DEFINITION  FOR System Peripherals</font>
<font color=#B22222>// *****************************************************************************</font>
<font color=#0000FF>typedef</font> <font color=#0000FF>struct</font> <b><a name="_AT91S_SYS">_AT91S_SYS</a></b> {
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_AIC.html#AIC_SMR">AIC_SMR</a>[32]; 	<font color=#B22222>// Source Mode Register</font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_AIC.html#AIC_SVR">AIC_SVR</a>[32]; 	<font color=#B22222>// Source Vector Register</font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_AIC.html#AIC_IVR">AIC_IVR</a>; 	<font color=#B22222>// IRQ Vector Register</font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_AIC.html#AIC_FVR">AIC_FVR</a>; 	<font color=#B22222>// FIQ Vector Register</font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_AIC.html#AIC_ISR">AIC_ISR</a>; 	<font color=#B22222>// Interrupt Status Register</font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_AIC.html#AIC_IPR">AIC_IPR</a>; 	<font color=#B22222>// Interrupt Pending Register</font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_AIC.html#AIC_IMR">AIC_IMR</a>; 	<font color=#B22222>// Interrupt Mask Register</font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_AIC.html#AIC_CISR">AIC_CISR</a>; 	<font color=#B22222>// Core Interrupt Status Register</font>
	<a href="#AT91_REG">AT91_REG</a>	 Reserved0[2]; 	<font color=#B22222>// </font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_AIC.html#AIC_IECR">AIC_IECR</a>; 	<font color=#B22222>// Interrupt Enable Command Register</font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_AIC.html#AIC_IDCR">AIC_IDCR</a>; 	<font color=#B22222>// Interrupt Disable Command Register</font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_AIC.html#AIC_ICCR">AIC_ICCR</a>; 	<font color=#B22222>// Interrupt Clear Command Register</font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_AIC.html#AIC_ISCR">AIC_ISCR</a>; 	<font color=#B22222>// Interrupt Set Command Register</font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_AIC.html#AIC_EOICR">AIC_EOICR</a>; 	<font color=#B22222>// End of Interrupt Command Register</font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_AIC.html#AIC_SPU">AIC_SPU</a>; 	<font color=#B22222>// Spurious Vector Register</font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_AIC.html#AIC_DCR">AIC_DCR</a>; 	<font color=#B22222>// Debug Control Register (Protect)</font>
	<a href="#AT91_REG">AT91_REG</a>	 Reserved1[1]; 	<font color=#B22222>// </font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_AIC.html#AIC_FFER">AIC_FFER</a>; 	<font color=#B22222>// Fast Forcing Enable Register</font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_AIC.html#AIC_FFDR">AIC_FFDR</a>; 	<font color=#B22222>// Fast Forcing Disable Register</font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_AIC.html#AIC_FFSR">AIC_FFSR</a>; 	<font color=#B22222>// Fast Forcing Status Register</font>
	<a href="#AT91_REG">AT91_REG</a>	 Reserved2[45]; 	<font color=#B22222>// </font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_DBGU.html#DBGU_CR">DBGU_CR</a>; 	<font color=#B22222>// Control Register</font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_DBGU.html#DBGU_MR">DBGU_MR</a>; 	<font color=#B22222>// Mode Register</font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_DBGU.html#DBGU_IER">DBGU_IER</a>; 	<font color=#B22222>// Interrupt Enable Register</font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_DBGU.html#DBGU_IDR">DBGU_IDR</a>; 	<font color=#B22222>// Interrupt Disable Register</font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_DBGU.html#DBGU_IMR">DBGU_IMR</a>; 	<font color=#B22222>// Interrupt Mask Register</font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_DBGU.html#DBGU_CSR">DBGU_CSR</a>; 	<font color=#B22222>// Channel Status Register</font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_DBGU.html#DBGU_RHR">DBGU_RHR</a>; 	<font color=#B22222>// Receiver Holding Register</font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_DBGU.html#DBGU_THR">DBGU_THR</a>; 	<font color=#B22222>// Transmitter Holding Register</font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_DBGU.html#DBGU_BRGR">DBGU_BRGR</a>; 	<font color=#B22222>// Baud Rate Generator Register</font>
	<a href="#AT91_REG">AT91_REG</a>	 Reserved3[7]; 	<font color=#B22222>// </font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_DBGU.html#DBGU_CIDR">DBGU_CIDR</a>; 	<font color=#B22222>// Chip ID Register</font>
	<a href="#AT91_REG">AT91_REG</a>	 <a href="AT91SAM7A3_DBGU.html#DBGU_EXID">DBGU_EXID</a>; 	<font color=#B22222>// Chip ID Extension Register</font>

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