mirror of
https://github.com/halleysfifthinc/AVCLAN-Mockingboard.git
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Allen Hill
50 lines
2.0 KiB
C
50 lines
2.0 KiB
C
// copyright (C) 2006 Marcin Slonicki <marcin@softservice.com.pl>
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// copyright (C) 2007 Louis Frigon
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// Copyright (C) 2015 Allen Hill <allenofthehills@gmail.com>
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// SPDX-License-Identifier: GPL-3.0-or-later
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// ATtiny3216 board bring-up: main-clock prescaler + GPIO config for pins not
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// owned by a peripheral's own init.
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#include <avr/interrupt.h>
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#include <avr/io.h>
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#include <avr/xmega.h> // _PROTECTED_WRITE
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#include "board.h"
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void board_init(void) {
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// Main clock prescale (CLK_PRESCALE / CLK_PRESCALE_DIV come from the build).
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_PROTECTED_WRITE(CLKCTRL.MCLKCTRLB, (CLK_PRESCALE | CLK_PRESCALE_DIV));
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// Set pins PC2-3, PB0,3-5 as inputs
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PORTC.DIRCLR = (PIN2_bm | // Unconnected
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PIN3_bm); // CTS
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PORTB.DIRCLR = (PIN0_bm | // Unconnected
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PIN3_bm | // IGN_SENSE
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PIN4_bm | // Unused, but connected to WOC (PC0)
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PIN5_bm); // Unused, but connected to WOD (PC1)
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// Enable pull-up resistor and disable input buffer (reduces any EM caused
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// pin toggling and saves power) for unused and unconnected pins
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PORTC.PIN2CTRL = PORT_PULLUPEN_bm | PORT_ISC_INPUT_DISABLE_gc;
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PORTB.PIN0CTRL = PORT_PULLUPEN_bm | PORT_ISC_INPUT_DISABLE_gc;
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// TODO: Remove once IGN_SENSE hardware is fixed
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PORTB.DIRSET = PIN3_bm;
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PORTB.OUTSET = PIN3_bm;
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// Output only pins: PA3-5, PB1-2,4-5; PC0-1
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// TODO: TxD (PA1), RTS (PA3) is output only, test if RxD needs the input
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// buffer or if the UART peripheral bypasses it
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PORTA.PIN3CTRL = PORT_ISC_INPUT_DISABLE_gc; // RTS
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PORTA.PIN4CTRL = PORT_ISC_INPUT_DISABLE_gc; // WOA
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PORTA.PIN5CTRL = PORT_ISC_INPUT_DISABLE_gc; // WOB
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PORTB.PIN1CTRL = PORT_ISC_INPUT_DISABLE_gc; // MIC_CONTROL
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PORTB.PIN4CTRL = PORT_ISC_INPUT_DISABLE_gc; // non-driving WOC
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PORTB.PIN5CTRL = PORT_ISC_INPUT_DISABLE_gc; // non-driving WOD
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PORTC.PIN0CTRL = PORT_ISC_INPUT_DISABLE_gc; // WOC
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PORTC.PIN1CTRL = PORT_ISC_INPUT_DISABLE_gc; // WOD
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}
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void board_interruptsEnable(void) { sei(); }
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