2 * Copyright 2015, Olivier MATZ <zer0@droids-corp.org>
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
7 * * Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of the University of California, Berkeley nor the
13 * names of its contributors may be used to endorse or promote products
14 * derived from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
25 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 #include <avr/interrupt.h>
30 #include <avr/pgmspace.h>
36 #include <ucg_delay.h>
40 static void ss_high(void)
42 printf("ss_high\r\n");
46 static void ss_low(void)
52 static uint8_t spi_sendrecv(uint8_t tx)
58 /* Wait for transmission complete */
59 while ((SPSR & (1 << SPIF)) == 0)
65 printf("sent 0x%2.2x, recvd 0x%2.2x '%c'\r\n",
66 tx, rx, isprint(rx) ? rx : '.');
76 /* spi: SS (PB2), MOSI (PB3), SCK (PB5) */
77 DDRB = (1 << 2) | (1 << 3) | (1 << 5);
81 /* blink led before start (unfortunatly it's on SCK, we can't
82 * use it during spi transfer) */
83 for (i = 0; i < 3; i++) {
96 #if 0 /* test serial (echo) */
102 ret = fread(&c, 1, 1, stdin);
104 fwrite(&c, 1, 1, stdout);
109 /* remove power reduction on spi */
110 PRR &= ~(1 << PRSPI);
112 /* Enable SPI, Master, set clock rate fck/16 */
113 SPCR = (1 << SPE) | (1 << MSTR) | (1 << SPR0);
118 /* read 5 bytes at address 0x1000 */
123 for (i = 0; i < 12; i++)
124 spi_sendrecv(0x00); /* data 0 to 12 */