mirror of
git://projects.qi-hardware.com/ben-wpan.git
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968721c335
Move board specific code form spi, usb and board_app into the new board specific files to avoid to many ifdefs.
123 lines
2.6 KiB
C
123 lines
2.6 KiB
C
/*
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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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#include "usb/usb.h"
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static bool spi_initialized = 0;
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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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void spi_begin(void)
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{
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if (!spi_initialized)
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spi_init();
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CLR(nSS);
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}
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void spi_off(void)
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{
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spi_initialized = 0;
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UCSR1B = 0;
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}
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void spi_init(void)
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{
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SET(nSS);
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OUT(SCLK);
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OUT(MOSI);
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OUT(nSS);
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IN(MISO);
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UBRR1 = 0; /* set bit rate to zero to begin */
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UCSR1C = 1 << UMSEL11 | 1 << UMSEL10;
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/* set MSPI, MSB first, SPI data mode 0 */
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UCSR1B = 1 << RXEN1 | 1 << TXEN1;
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/* enable receiver and transmitter */
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UBRR1 = 0; /* reconfirm the bit rate */
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spi_initialized = 1;
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}
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void usb_init(void)
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{
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USBCON |= 1 << FRZCLK; /* freeze the clock */
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/* enable the PLL and wait for it to lock */
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PLLCSR &= ~(1 << PLLP2 | 1 << PLLP1 | 1 << PLLP0);
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PLLCSR |= 1 << PLLE;
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while (!(PLLCSR & (1 << PLOCK)));
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USBCON &= ~(1 << USBE); /* reset the controller */
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USBCON |= 1 << USBE;
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USBCON &= ~(1 << FRZCLK); /* thaw the clock */
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UDCON &= ~(1 << DETACH); /* attach the pull-up */
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UDIEN = 1 << EORSTE; /* enable device interrupts */
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// UDCON |= 1 << RSTCPU; /* reset CPU on bus reset */
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ep_init();
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}
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void board_app_init(void)
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{
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/* enable INT0, trigger on rising edge */
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EICRA = 1 << ISC01 | 1 << ISC00;
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EIMSK = 1 << 0;
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}
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