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git://projects.qi-hardware.com/ben-wpan.git
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61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
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/*
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* fw/board_atusb.c - ATUSB Board-specific functions (for boot loader and application)
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*
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* Written 2016 by Stefan Schmidt
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* Copyright 2016 Stefan Schmidt
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdbool.h>
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#include <stdint.h>
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/boot.h>
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#define F_CPU 8000000UL
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#include <util/delay.h>
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#include "usb.h"
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#include "at86rf230.h"
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#include "board.h"
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#include "spi.h"
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void set_clkm(void)
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{
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/* switch CLKM to 8 MHz */
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/*
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* @@@ Note: Atmel advise against changing the external clock in
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* mid-flight. We should therefore switch to the RC clock first, then
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* crank up the external clock, and finally switch back to the external
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* clock. The clock switching procedure is described in the ATmega32U2
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* data sheet in secton 8.2.2.
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*/
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spi_begin();
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spi_send(AT86RF230_REG_WRITE | REG_TRX_CTRL_0);
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spi_send(CLKM_CTRL_8MHz);
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spi_end();
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}
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void board_init(void)
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{
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/* Disable the watchdog timer */
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MCUSR = 0; /* Remove override */
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WDTCSR |= 1 << WDCE; /* Enable change */
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WDTCSR = 1 << WDCE; /* Disable watchdog while still enabling
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change */
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CLKPR = 1 << CLKPCE;
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/* We start with a 1 MHz/8 clock. Disable the prescaler. */
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CLKPR = 0;
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get_sernum();
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}
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