196 lines
6.1 KiB
C
196 lines
6.1 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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#include <util/delay.h>
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#include "lib/data-types.h"
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#define TWI_FREQ 400000
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#include "lib/twi.h"
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#include "matrix.h"
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#include "teensy-2-0.h"
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#include "teensy-2-0--private.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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/* pin macros
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* - note: you can move the `UNUSED`, `ROW`, and `COLUMN` pins around, but be
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* sure to keep the set of all the pins listed constant. other pins are not
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* movable, and either are referenced explicitly or have macros defined for
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* them elsewhere.
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* - note: if you change pin assignments, please be sure to update
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* "teensy-2-0.md", and the '.svg' circuit diagram.
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*/
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// --- helpers
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#define teensypin_write(register, operation, pin) do { \
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_teensypin_write(register, operation, pin); \
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_delay_us(1); /* allow pins time to stabalize */ \
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} while(0)
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#define _teensypin_write(register, operation, pin_letter, pin_number) \
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((register##pin_letter) operation (1<<(pin_number)))
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#define teensypin_read(pin) \
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_teensypin_read(pin)
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#define _teensypin_read(pin_letter, pin_number) \
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((PIN##pin_letter) & (1<<(pin_number)))
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#define teensypin_write_all_unused(register, operation) \
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do { \
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teensypin_write(register, operation, UNUSED_0); \
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teensypin_write(register, operation, UNUSED_1); \
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teensypin_write(register, operation, UNUSED_2); \
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teensypin_write(register, operation, UNUSED_3); \
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teensypin_write(register, operation, UNUSED_4); \
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teensypin_write(register, operation, UNUSED_5); } \
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while(0)
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#define teensypin_write_all_row(register, operation) \
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do { \
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teensypin_write(register, operation, ROW_0); \
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teensypin_write(register, operation, ROW_1); \
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teensypin_write(register, operation, ROW_2); \
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teensypin_write(register, operation, ROW_3); \
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teensypin_write(register, operation, ROW_4); \
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teensypin_write(register, operation, ROW_5); } \
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while(0)
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#define teensypin_write_all_column(register, operation) \
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do { \
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teensypin_write(register, operation, COLUMN_0); \
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teensypin_write(register, operation, COLUMN_1); \
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teensypin_write(register, operation, COLUMN_2); \
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teensypin_write(register, operation, COLUMN_3); \
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teensypin_write(register, operation, COLUMN_4); \
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teensypin_write(register, operation, COLUMN_5); \
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teensypin_write(register, operation, COLUMN_6); } \
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while(0)
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#define SET |=
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#define CLEAR &=~
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// --- unused
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#define UNUSED_0 B, 1 // SPI pin
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#define UNUSED_1 B, 2 // SPI pin
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#define UNUSED_2 B, 3 // SPI pin
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#define UNUSED_3 D, 4 // hard to use with breadboard (on the end)
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#define UNUSED_4 D, 5 // hard to use with breadboard (on the end)
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#define UNUSED_5 E, 6 // hard to use with breadboard (internal)
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// --- rows
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#define ROW_0 F, 0
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#define ROW_1 F, 1
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#define ROW_2 F, 4
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#define ROW_3 F, 5
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#define ROW_4 F, 6
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#define ROW_5 F, 7
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// --- columns
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#define COLUMN_0 B, 4
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#define COLUMN_1 C, 6
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#define COLUMN_2 C, 7
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#define COLUMN_3 D, 2
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#define COLUMN_4 D, 3
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#define COLUMN_5 D, 7
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#define COLUMN_6 B, 0
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/* returns
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* - success: 0
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*/
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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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// onboard LED
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DDRD &= ~(1<<6); // set D(6) as input
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PORTD &= ~(1<<6); // set D(6) internal pull-up disabled
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// keyboard LEDs (see "PWM on ports OC1(A|B|C)" in "teensy-2-0.md")
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_kb_led_all_off(); // (just to put the pins in a known state)
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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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// I2C (TWI)
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twi_init(); // on pins D(1,0)
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// unused pins
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teensypin_write_all_unused(DDR, CLEAR); // set as input
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teensypin_write_all_unused(PORT, SET); // set internal pull-up enabled
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// rows
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teensypin_write_all_row(DDR, CLEAR); // set as input
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teensypin_write_all_row(PORT, SET); // set internal pull-up enabled
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// columns
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teensypin_write_all_column(DDR, CLEAR); // set as input (hi-Z)
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teensypin_write_all_column(PORT, CLEAR); // set internal pull-up
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// disabled
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return 0; // success
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}
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/* returns
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* - success: 0
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*/
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#if KB_ROWS != 12 || KB_COLUMNS != 7
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#error "Expecting different keyboard dimensions"
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#endif
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static inline void _update_rows(
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bool matrix[KB_ROWS][KB_COLUMNS], uint8_t column ) {
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matrix[0][column] = ! teensypin_read(ROW_0);
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matrix[1][column] = ! teensypin_read(ROW_1);
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matrix[2][column] = ! teensypin_read(ROW_2);
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matrix[3][column] = ! teensypin_read(ROW_3);
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matrix[4][column] = ! teensypin_read(ROW_4);
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matrix[5][column] = ! teensypin_read(ROW_5);
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}
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uint8_t teensy_update_matrix(bool matrix[KB_ROWS][KB_COLUMNS]) {
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teensypin_write(DDR, SET, COLUMN_0); // set col low (set as output)
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_update_rows(matrix, 0); // read row 0..5 & update matrix
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teensypin_write(DDR, CLEAR, COLUMN_0); // set col hi-Z (set as input)
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teensypin_write(DDR, SET, COLUMN_1);
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_update_rows(matrix, 1);
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teensypin_write(DDR, CLEAR, COLUMN_1);
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teensypin_write(DDR, SET, COLUMN_2);
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_update_rows(matrix, 2);
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teensypin_write(DDR, CLEAR, COLUMN_2);
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teensypin_write(DDR, SET, COLUMN_3);
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_update_rows(matrix, 3);
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teensypin_write(DDR, CLEAR, COLUMN_3);
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teensypin_write(DDR, SET, COLUMN_4);
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_update_rows(matrix, 4);
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teensypin_write(DDR, CLEAR, COLUMN_4);
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teensypin_write(DDR, SET, COLUMN_5);
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_update_rows(matrix, 5);
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teensypin_write(DDR, CLEAR, COLUMN_5);
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teensypin_write(DDR, SET, COLUMN_6);
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_update_rows(matrix, 6);
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teensypin_write(DDR, CLEAR, COLUMN_6);
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return 0; // success
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}
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