Root/atusb/fw/board_rzusb.c

Source at commit ac710d0de437e2292a94498c38339d8d978adbee created 6 years 7 months ago.
By Werner Almesberger, web/index.html: update shop links; status table; link to ATUSB schematics
1/*
2 * fw/board_rzusb.c - RZUSB Board-specific functions (for boot loader and application)
3 *
4 * Written 2016 by Stefan Schmidt
5 * Copyright 2016 Stefan Schmidt
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 */
12
13
14#include <stdbool.h>
15#include <stdint.h>
16
17#include <avr/io.h>
18#include <avr/interrupt.h>
19#include <avr/boot.h>
20
21#define F_CPU 8000000UL
22#include <util/delay.h>
23
24#include "usb.h"
25#include "at86rf230.h"
26#include "board.h"
27#include "spi.h"
28#include "usb/usb.h"
29
30static bool spi_initialized = 0;
31
32void set_clkm(void)
33{
34    /* switch CLKM to 8 MHz */
35
36    /*
37     * @@@ Note: Atmel advise against changing the external clock in
38     * mid-flight. We should therefore switch to the RC clock first, then
39     * crank up the external clock, and finally switch back to the external
40     * clock. The clock switching procedure is described in the ATmega32U2
41     * data sheet in secton 8.2.2.
42     */
43    spi_begin();
44    spi_send(AT86RF230_REG_WRITE | REG_TRX_CTRL_0);
45    spi_send(0x10);
46    spi_end();
47
48    /* TX_AUTO_CRC_ON, default disabled */
49    spi_begin();
50    spi_send(AT86RF230_REG_WRITE | 0x05);
51    spi_send(0x80);
52    spi_end();
53}
54
55void board_init(void)
56{
57    /* Disable the watchdog timer */
58
59    MCUSR = 0; /* Remove override */
60    WDTCSR |= 1 << WDCE; /* Enable change */
61    WDTCSR = 1 << WDCE; /* Disable watchdog while still enabling
62                   change */
63
64    CLKPR = 1 << CLKPCE;
65    /* We start with a 16 MHz/8 clock. Put the prescaler to 2. */
66    CLKPR = 1 << CLKPS0;
67
68    get_sernum();
69}
70
71void spi_begin(void)
72{
73    if (!spi_initialized)
74        spi_init();
75    CLR(nSS);
76}
77
78void spi_off(void)
79{
80    spi_initialized = 0;
81    SPCR &= ~(1 << SPE);
82}
83
84void spi_init(void)
85{
86    SET(nSS);
87    OUT(SCLK);
88    OUT(MOSI);
89    OUT(nSS);
90    IN(MISO);
91
92    SPCR = (1 << SPE) | (1 << MSTR);
93    SPSR = (1 << SPI2X);
94
95    spi_initialized = 1;
96}
97
98void usb_init(void)
99{
100    USBCON |= 1 << FRZCLK; /* freeze the clock */
101
102    /* enable the PLL and wait for it to lock */
103    /* TODO sheet page 50 For Atmel AT90USB128x only. Do not use with Atmel AT90USB64x. */
104    /* FOR 8 XTAL Mhz only!!! */
105    PLLCSR = ((1 << PLLP1) | (1 << PLLP0));
106    PLLCSR |= 1 << PLLE;
107    while (!(PLLCSR & (1 << PLOCK)));
108
109    UHWCON |= (1 << UVREGE);
110
111    USBCON &= ~((1 << USBE) | (1 << OTGPADE)); /* reset the controller */
112    USBCON |= ((1 << USBE) | (1 << OTGPADE));
113
114    USBCON &= ~(1 << FRZCLK); /* thaw the clock */
115
116    UDCON &= ~(1 << DETACH); /* attach the pull-up */
117    UDIEN = 1 << EORSTE; /* enable device interrupts */
118// UDCON |= 1 << RSTCPU; /* reset CPU on bus reset */
119
120    ep_init();
121}
122
123void board_app_init(void)
124{
125    /* enable timer input capture 1, trigger on rising edge */
126    TCCR1B = (1 << ICES1);
127    TIFR1 = (1 << ICF1);
128    TIMSK1 = (1 << ICIE1);
129}
130

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