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104 lines
1.8 KiB
C
104 lines
1.8 KiB
C
/*
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* fw/board.c - Board-specific functions
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*
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* Written 2011 by Werner Almesberger
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* Copyright 2011 Werner Almesberger
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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 <stdint.h>
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#define F_CPU 8000000UL
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#include <util/delay.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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static 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 reset_rf(void)
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{
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/* AT86RF231 data sheet, 12.4.13, reset pulse width: 625 ns (min) */
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CLR(nRST_RF);
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_delay_us(1);
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SET(nRST_RF);
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/* 12.4.14: SPI access latency after reset: 625 ns (min) */
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_delay_us(1);
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/* we must restore TRX_CTRL_0 after each reset (9.6.4) */
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set_clkm();
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}
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uint8_t read_irq(void)
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{
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return PIN(IRQ_RF);
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}
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void led(int on)
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{
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if (on)
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SET(LED);
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else
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CLR(LED);
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}
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void panic(void)
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{
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cli();
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while (1) {
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SET(LED);
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_delay_ms(100);
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CLR(LED);
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_delay_ms(100);
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}
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}
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void board_init(void)
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{
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/* We start with a 1 MHz/8 clock. Disable the prescaler. */
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CLKPR = 1 << CLKPCE;
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CLKPR = 0;
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/* set up all the outputs; default port value is 0 */
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OUT(LED);
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OUT(nRST_RF); /* resets the transceiver */
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OUT(SLP_TR);
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}
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