Contiki-NG
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spi-legacy.c
1/*
2 * Copyright (c) 2006, Swedish Institute of Computer Science
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the Institute nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 */
30
31#include "contiki.h"
32
33/*
34 * On the Tmote sky access to I2C/SPI/UART0 must always be
35 * exclusive. Set spi_busy so that interrupt handlers can check if
36 * they are allowed to use the bus or not. Only the CC2420 radio needs
37 * this in practice.
38 *
39 */
40unsigned char spi_busy = 0;
41
42/*
43 * Initialize SPI bus.
44 */
45void
46spi_init(void)
47{
48/*
49 static unsigned char spi_inited = 0;
50
51 if (spi_inited)
52 return;
53*/
54 /* Initalize ports for communication with SPI units. */
55
56 U0CTL = CHAR + SYNC + MM + SWRST; /* SW reset,8-bit transfer, SPI master */
57 U0TCTL = CKPH + SSEL1 + STC; /* Data on Rising Edge, SMCLK, 3-wire. */
58
59 U0BR0 = 0x02; /* SPICLK set baud. */
60 U0BR1 = 0; /* Dont need baud rate control register 2 - clear it */
61 U0MCTL = 0; /* Dont need modulation control. */
62
63 P3SEL |= BV(SCK) | BV(MOSI) | BV(MISO); /* Select Peripheral functionality */
64 P3DIR |= BV(SCK) | BV(MISO); /* Configure as outputs(SIMO,CLK). */
65
66 ME1 |= USPIE0; /* Module enable ME1 --> U0ME? xxx/bg */
67 U0CTL &= ~SWRST; /* Remove RESET */
68}