Added port for ATmega8 - but not quite small enough yet. Compiled for ATmega168 (but at 8734 bytes of flash).

2008-09-27 22:19:23 +00:00
parent 437de29ce7
commit 67a7cdbc12
23 changed files with 4645 additions and 0 deletions
@@ -0,0 +1,122 @@
+/**************************************************************************
+*
+* Copyright (C) 2007 Steve Karg <skarg@users.sourceforge.net>
+*
+* Permission is hereby granted, free of charge, to any person obtaining
+* a copy of this software and associated documentation files (the
+* "Software"), to deal in the Software without restriction, including
+* without limitation the rights to use, copy, modify, merge, publish,
+* distribute, sublicense, and/or sell copies of the Software, and to
+* permit persons to whom the Software is furnished to do so, subject to
+* the following conditions:
+*
+* The above copyright notice and this permission notice shall be included
+* in all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*
+*********************************************************************/
+
+#include <stdbool.h>
+#include <stdint.h>
+#include "hardware.h"
+#include "timer.h"
+#include "rs485.h"
+#include "datalink.h"
+#include "npdu.h"
+#include "txbuf.h"
+#include "iam.h"
+#include "device.h"
+#include "av.h"
+#include "handlers.h"
+
+/* local version override */
+const char *BACnet_Version = "1.0";
+
+/* For porting to IAR, see:
+   http://www.avrfreaks.net/wiki/index.php/Documentation:AVR_GCC/IarToAvrgcc*/
+
+/* dummy function - so we can use default demo handlers */
+bool dcc_communication_enabled(
+    void)
+{
+    return true;
+}
+
+static void init(
+    void)
+{
+    /* FIXME: Initialize the Clock Prescaler for ATmega8 */
+#if defined(__AVR_ATmega168__)
+    /* The default CLKPSx bits are factory set to 0011 */
+    /* Enbable the Clock Prescaler */
+    CLKPR = _BV(CLKPCE);
+    /* CLKPS3 CLKPS2 CLKPS1 CLKPS0 Clock Division Factor
+       ------ ------ ------ ------ ---------------------
+       0      0      0      0             1
+       0      0      0      1             2
+       0      0      1      0             4
+       0      0      1      1             8
+       0      1      0      0            16
+       0      1      0      1            32
+       0      1      1      0            64
+       0      1      1      1           128
+       1      0      0      0           256
+       1      x      x      x      Reserved
+     */
+    /* Set the CLKPS3..0 bits to Prescaler of 1 */
+    CLKPR = 0;
+#endif
+    /* Initialize I/O ports */
+    /* For Port DDRx (Data Direction) Input=0, Output=1 */
+    /* For Port PORTx (Bit Value) TriState=0, High=1 */
+    DDRB = 0;
+    PORTB = 0;
+    DDRC = 0;
+    PORTC = 0;
+    DDRD = 0;
+    PORTD = 0;
+
+    /* Configure the watchdog timer - Disabled for testing */
+#if defined(__AVR_ATmega168__)
+    BIT_CLEAR(MCUSR, WDRF);
+    WDTCSR = 0;
+#else
+    BIT_CLEAR(MCUCSR, WDRF);
+    WDTCR = 0;
+#endif
+
+    /* Configure Specialized Hardware */
+    RS485_Initialize();
+    RS485_Set_Baud_Rate(38400);
+    /* Configure Timer0 for millisecond timer */
+    timer_init();
+    /* Enable global interrupts */
+    __enable_interrupt();
+}
+
+static uint8_t PDUBuffer[MAX_MPDU];
+
+int main(
+    void)
+{
+    uint16_t pdu_len = 0;
+    BACNET_ADDRESS src; /* source address */
+
+    init();
+    datalink_init(NULL);
+    for (;;) {
+        /* other tasks */
+        /* BACnet handling */
+        pdu_len = datalink_receive(&src, &PDUBuffer[0], sizeof(PDUBuffer), 0);
+        if (pdu_len) {
+            npdu_handler(&src, &PDUBuffer[0], pdu_len);
+        }
+    }
+}