64 lines
2.2 KiB
C
64 lines
2.2 KiB
C
/* ----------------------------------------------------------------------------
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* ergoDOX controller: Teensy 2.0 specific code
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* ----------------------------------------------------------------------------
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* Copyright (c) 2012 Ben Blazak <benblazak.dev@gmail.com>
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* Released under The MIT License (MIT) (see "license.md")
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* Project located at <https://github.com/benblazak/ergodox-firmware>
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* ------------------------------------------------------------------------- */
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#include <avr/io.h>
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#define TEENSY_2_0_h_INCLUDE_PRIVATE
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#include "teensy-2-0.h"
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// processor frequency (from <http://www.pjrc.com/teensy/prescaler.html>)
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#define CPU_PRESCALE(n) (CLKPR = 0x80, CLKPR = (n))
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#define CPU_16MHz 0x00
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#define CPU_8MHz 0x01
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#define CPU_4MHz 0x02
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#define CPU_2MHz 0x03
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#define CPU_1MHz 0x04
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#define CPU_500kHz 0x05
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#define CPU_250kHz 0x06
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#define CPU_125kHz 0x07
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#define CPU_62kHz 0x08
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uint8_t teensy_init(void) {
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CPU_PRESCALE(CPU_16MHz); // speed should match F_CPU in makefile
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// unused pins
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DDRB &= ~0b00001110; // set B(3,2,1) as input
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PORTB |= 0b00001110; // set B(3,2,1) internal pull-up enabled
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DDRD &= ~0b01110000; // set D(6,5,4) as input
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PORTD |= 0b00110000; // set D( 5,4) internal pull-up enabled
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DDRE &= ~0b01000000; // set E(6) as input
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PORTE |= 0b01000000; // set E(6) internal pull-up enabled
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// LEDs (see "PWM on ports OC1(A|B|C)" in "teensy-2-0.md")
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DDRB |= 0b11100000; // set B(7,6,5) as output
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TCCR1A = 0b10101001; // set and configure fast PWM
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TCCR1B = 0b00001001; // set and configure fast PWM
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// rows
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DDRF |= 0b11110011; // set F(7,6,5,4,1,0) as output
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PORTF |= 0b11110011; // set F(7,6,5,4,1,0) drive high
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// columns
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DDRB &= ~0b00010001; // set B(4,0) as input
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PORTB |= 0b00010001; // set B(4,0) internal pull-up enabled
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DDRC &= ~0b11000000; // set C(7,6) as input
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PORTC |= 0b11000000; // set C(7,6) internal pull-up enabled
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DDRD &= ~0b10001100; // set D(7,3,2) as input
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PORTD |= 0b10001100; // set D(7,3,2) internal pull-up enabled
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// I2C (TWI)
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// on pins D(1,0); leave them alone here, so the TWI library can do as
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// it wishes
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return 0; // success
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}
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