ih_usart0_rx.c

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00001 /*
00002  * Copyright (C) 2001-2005 by egnite Software GmbH. All rights reserved.
00003  *
00004  * Redistribution and use in source and binary forms, with or without
00005  * modification, are permitted provided that the following conditions
00006  * are met:
00007  *
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the copyright holders nor the names of
00014  *    contributors may be used to endorse or promote products derived
00015  *    from this software without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH AND CONTRIBUTORS
00018  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00019  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
00020  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL EGNITE
00021  * SOFTWARE GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
00022  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
00023  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
00024  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
00025  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00026  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
00027  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00028  * SUCH DAMAGE.
00029  *
00030  * For additional information see http://www.ethernut.de/
00031  *
00032  */
00033 
00083 #include <dev/irqreg.h>
00084 
00089 
00090 static int AvrUart0RxIrqCtl(int cmd, void *param);
00091 
00092 IRQ_HANDLER sig_UART0_RECV = {
00093 #ifdef NUT_PERFMON
00094     0,                          /* Interrupt counter, ir_count. */
00095 #endif
00096     NULL,                       /* Passed argument, ir_arg. */
00097     NULL,                       /* Handler subroutine, ir_handler. */
00098     AvrUart0RxIrqCtl            /* Interrupt control, ir_ctl. */
00099 };
00100 
00116 static int AvrUart0RxIrqCtl(int cmd, void *param)
00117 {
00118     int rc = 0;
00119     u_int *ival = (u_int *) param;
00120     int enabled = bit_is_set(UCR, RXCIE);
00121     u_char bval;
00122 
00123     /* Disable interrupt. */
00124     cbi(UCR, RXCIE);
00125 
00126     switch (cmd) {
00127     case NUT_IRQCTL_INIT:
00128         enabled = 0;
00129     case NUT_IRQCTL_CLEAR:
00130         /* Clear any pending interrupt. */
00131         bval = inb(UDR);
00132         bval = inb(UDR);
00133         break;
00134     case NUT_IRQCTL_STATUS:
00135         if (bit_is_set(USR, RXC)) {
00136             *ival = 1;
00137         } else {
00138             *ival = 0;
00139         }
00140         if (enabled) {
00141             *ival |= 0x80;
00142         }
00143         break;
00144     case NUT_IRQCTL_ENABLE:
00145         enabled = 1;
00146         break;
00147     case NUT_IRQCTL_DISABLE:
00148         enabled = 0;
00149         break;
00150     case NUT_IRQCTL_GETPRIO:
00151         *ival = 16;
00152         break;
00153 #ifdef NUT_PERFMON
00154     case NUT_IRQCTL_GETCOUNT:
00155         *ival = (u_int) sig_UART0_RECV.ir_count;
00156         sig_UART0_RECV.ir_count = 0;            
00157         break;
00158 #endif
00159     default:
00160         rc = -1;
00161         break;
00162     }
00163 
00164     /* Enable interrupt. */
00165     if (enabled) {
00166         sbi(UCR, RXCIE);
00167     }
00168     return rc;
00169 }
00170 
00171 #if defined(SIG_UART0_RECV) || defined(iv_USART0_RX)
00172 
00176 #ifdef __IMAGECRAFT__
00177 #pragma interrupt_handler SIG_UART0_RECV:iv_USART0_RX
00178 #endif
00179 NUTSIGNAL(SIG_UART0_RECV, sig_UART0_RECV)
00180 #elif defined(SIG_USART0_RECV)
00181 
00182 NUTSIGNAL(SIG_USART0_RECV, sig_UART0_RECV)
00183 
00184 #else
00185 
00189 #ifdef __IMAGECRAFT__
00190 #pragma interrupt_handler SIG_UART_RECV:iv_UART_RX
00191 #endif
00192 NUTSIGNAL(SIG_UART_RECV, sig_UART0_RECV)
00193 #endif
00194 

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