@ -1,162 +0,0 @@ | |||||
#include <util/twi.h> | |||||
#include <avr/io.h> | |||||
#include <stdlib.h> | |||||
#include <avr/interrupt.h> | |||||
#include <util/twi.h> | |||||
#include <stdbool.h> | |||||
#include "i2c.h" | |||||
#ifdef USE_I2C | |||||
// Limits the amount of we wait for any one i2c transaction. | |||||
// Since were running SCL line 100kHz (=> 10μs/bit), and each transactions is | |||||
// 9 bits, a single transaction will take around 90μs to complete. | |||||
// | |||||
// (F_CPU/SCL_CLOCK) => # of μC cycles to transfer a bit | |||||
// poll loop takes at least 8 clock cycles to execute | |||||
#define I2C_LOOP_TIMEOUT (9+1)*(F_CPU/SCL_CLOCK)/8 | |||||
#define BUFFER_POS_INC() (slave_buffer_pos = (slave_buffer_pos+1)%SLAVE_BUFFER_SIZE) | |||||
volatile uint8_t i2c_slave_buffer[SLAVE_BUFFER_SIZE]; | |||||
static volatile uint8_t slave_buffer_pos; | |||||
static volatile bool slave_has_register_set = false; | |||||
// Wait for an i2c operation to finish | |||||
inline static | |||||
void i2c_delay(void) { | |||||
uint16_t lim = 0; | |||||
while(!(TWCR & (1<<TWINT)) && lim < I2C_LOOP_TIMEOUT) | |||||
lim++; | |||||
// easier way, but will wait slightly longer | |||||
// _delay_us(100); | |||||
} | |||||
// Setup twi to run at 100kHz | |||||
void i2c_master_init(void) { | |||||
// no prescaler | |||||
TWSR = 0; | |||||
// Set TWI clock frequency to SCL_CLOCK. Need TWBR>10. | |||||
// Check datasheets for more info. | |||||
TWBR = ((F_CPU/SCL_CLOCK)-16)/2; | |||||
} | |||||
// Start a transaction with the given i2c slave address. The direction of the | |||||
// transfer is set with I2C_READ and I2C_WRITE. | |||||
// returns: 0 => success | |||||
// 1 => error | |||||
uint8_t i2c_master_start(uint8_t address) { | |||||
TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTA); | |||||
i2c_delay(); | |||||
// check that we started successfully | |||||
if ( (TW_STATUS != TW_START) && (TW_STATUS != TW_REP_START)) | |||||
return 1; | |||||
TWDR = address; | |||||
TWCR = (1<<TWINT) | (1<<TWEN); | |||||
i2c_delay(); | |||||
if ( (TW_STATUS != TW_MT_SLA_ACK) && (TW_STATUS != TW_MR_SLA_ACK) ) | |||||
return 1; // slave did not acknowledge | |||||
else | |||||
return 0; // success | |||||
} | |||||
// Finish the i2c transaction. | |||||
void i2c_master_stop(void) { | |||||
TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO); | |||||
uint16_t lim = 0; | |||||
while(!(TWCR & (1<<TWSTO)) && lim < I2C_LOOP_TIMEOUT) | |||||
lim++; | |||||
} | |||||
// Write one byte to the i2c slave. | |||||
// returns 0 => slave ACK | |||||
// 1 => slave NACK | |||||
uint8_t i2c_master_write(uint8_t data) { | |||||
TWDR = data; | |||||
TWCR = (1<<TWINT) | (1<<TWEN); | |||||
i2c_delay(); | |||||
// check if the slave acknowledged us | |||||
return (TW_STATUS == TW_MT_DATA_ACK) ? 0 : 1; | |||||
} | |||||
// Read one byte from the i2c slave. If ack=1 the slave is acknowledged, | |||||
// if ack=0 the acknowledge bit is not set. | |||||
// returns: byte read from i2c device | |||||
uint8_t i2c_master_read(int ack) { | |||||
TWCR = (1<<TWINT) | (1<<TWEN) | (ack<<TWEA); | |||||
i2c_delay(); | |||||
return TWDR; | |||||
} | |||||
void i2c_reset_state(void) { | |||||
TWCR = 0; | |||||
} | |||||
void i2c_slave_init(uint8_t address) { | |||||
TWAR = address << 0; // slave i2c address | |||||
// TWEN - twi enable | |||||
// TWEA - enable address acknowledgement | |||||
// TWINT - twi interrupt flag | |||||
// TWIE - enable the twi interrupt | |||||
TWCR = (1<<TWIE) | (1<<TWEA) | (1<<TWINT) | (1<<TWEN); | |||||
} | |||||
ISR(TWI_vect); | |||||
ISR(TWI_vect) { | |||||
uint8_t ack = 1; | |||||
switch(TW_STATUS) { | |||||
case TW_SR_SLA_ACK: | |||||
// this device has been addressed as a slave receiver | |||||
slave_has_register_set = false; | |||||
break; | |||||
case TW_SR_DATA_ACK: | |||||
// this device has received data as a slave receiver | |||||
// The first byte that we receive in this transaction sets the location | |||||
// of the read/write location of the slaves memory that it exposes over | |||||
// i2c. After that, bytes will be written at slave_buffer_pos, incrementing | |||||
// slave_buffer_pos after each write. | |||||
if(!slave_has_register_set) { | |||||
slave_buffer_pos = TWDR; | |||||
// don't acknowledge the master if this memory loctaion is out of bounds | |||||
if ( slave_buffer_pos >= SLAVE_BUFFER_SIZE ) { | |||||
ack = 0; | |||||
slave_buffer_pos = 0; | |||||
} | |||||
slave_has_register_set = true; | |||||
} else { | |||||
i2c_slave_buffer[slave_buffer_pos] = TWDR; | |||||
BUFFER_POS_INC(); | |||||
} | |||||
break; | |||||
case TW_ST_SLA_ACK: | |||||
case TW_ST_DATA_ACK: | |||||
// master has addressed this device as a slave transmitter and is | |||||
// requesting data. | |||||
TWDR = i2c_slave_buffer[slave_buffer_pos]; | |||||
BUFFER_POS_INC(); | |||||
break; | |||||
case TW_BUS_ERROR: // something went wrong, reset twi state | |||||
TWCR = 0; | |||||
default: | |||||
break; | |||||
} | |||||
// Reset everything, so we are ready for the next TWI interrupt | |||||
TWCR |= (1<<TWIE) | (1<<TWINT) | (ack<<TWEA) | (1<<TWEN); | |||||
} | |||||
#endif |
@ -1,49 +0,0 @@ | |||||
#ifndef I2C_H | |||||
#define I2C_H | |||||
#include <stdint.h> | |||||
#ifndef F_CPU | |||||
#define F_CPU 16000000UL | |||||
#endif | |||||
#define I2C_READ 1 | |||||
#define I2C_WRITE 0 | |||||
#define I2C_ACK 1 | |||||
#define I2C_NACK 0 | |||||
#define SLAVE_BUFFER_SIZE 0x10 | |||||
// i2c SCL clock frequency | |||||
#define SCL_CLOCK 100000L | |||||
extern volatile uint8_t i2c_slave_buffer[SLAVE_BUFFER_SIZE]; | |||||
void i2c_master_init(void); | |||||
uint8_t i2c_master_start(uint8_t address); | |||||
void i2c_master_stop(void); | |||||
uint8_t i2c_master_write(uint8_t data); | |||||
uint8_t i2c_master_read(int); | |||||
void i2c_reset_state(void); | |||||
void i2c_slave_init(uint8_t address); | |||||
static inline unsigned char i2c_start_read(unsigned char addr) { | |||||
return i2c_master_start((addr << 1) | I2C_READ); | |||||
} | |||||
static inline unsigned char i2c_start_write(unsigned char addr) { | |||||
return i2c_master_start((addr << 1) | I2C_WRITE); | |||||
} | |||||
// from SSD1306 scrips | |||||
extern unsigned char i2c_rep_start(unsigned char addr); | |||||
extern void i2c_start_wait(unsigned char addr); | |||||
extern unsigned char i2c_readAck(void); | |||||
extern unsigned char i2c_readNak(void); | |||||
extern unsigned char i2c_read(unsigned char ack); | |||||
#define i2c_read(ack) (ack) ? i2c_readAck() : i2c_readNak(); | |||||
#endif |
@ -1,459 +0,0 @@ | |||||
/* | |||||
Copyright 2018 Mattia Dal Ben <matthewdibi@gmail.com> | |||||
This program is free software: you can redistribute it and/or modify | |||||
it under the terms of the GNU General Public License as published by | |||||
the Free Software Foundation, either version 2 of the License, or | |||||
(at your option) any later version. | |||||
This program is distributed in the hope that it will be useful, | |||||
but WITHOUT ANY WARRANTY; without even the implied warranty of | |||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |||||
GNU General Public License for more details. | |||||
You should have received a copy of the GNU General Public License | |||||
along with this program. If not, see <http://www.gnu.org/licenses/>. | |||||
*/ | |||||
/* | |||||
* scan matrix | |||||
*/ | |||||
#include <stdint.h> | |||||
#include <stdbool.h> | |||||
#include <avr/io.h> | |||||
#include "wait.h" | |||||
#include "print.h" | |||||
#include "debug.h" | |||||
#include "util.h" | |||||
#include "matrix.h" | |||||
#include "split_util.h" | |||||
#include "pro_micro.h" | |||||
#include "config.h" | |||||
#include "timer.h" | |||||
#ifdef USE_I2C | |||||
# include "i2c.h" | |||||
#else // USE_SERIAL | |||||
# include "serial.h" | |||||
#endif | |||||
#ifndef DEBOUNCING_DELAY | |||||
# define DEBOUNCING_DELAY 5 | |||||
#endif | |||||
#if (DEBOUNCING_DELAY > 0) | |||||
static uint16_t debouncing_time; | |||||
static bool debouncing = false; | |||||
#endif | |||||
#if (MATRIX_COLS <= 8) | |||||
# define print_matrix_header() print("\nr/c 01234567\n") | |||||
# define print_matrix_row(row) print_bin_reverse8(matrix_get_row(row)) | |||||
# define matrix_bitpop(i) bitpop(matrix[i]) | |||||
# define ROW_SHIFTER ((uint8_t)1) | |||||
#else | |||||
# error "Currently only supports 8 COLS" | |||||
#endif | |||||
static matrix_row_t matrix_debouncing[MATRIX_ROWS]; | |||||
#define ERROR_DISCONNECT_COUNT 5 | |||||
#define ROWS_PER_HAND (MATRIX_ROWS/2) | |||||
static uint8_t error_count = 0; | |||||
static const uint8_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS; | |||||
static const uint8_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS; | |||||
/* matrix state(1:on, 0:off) */ | |||||
static matrix_row_t matrix[MATRIX_ROWS]; | |||||
static matrix_row_t matrix_debouncing[MATRIX_ROWS]; | |||||
#if (DIODE_DIRECTION == COL2ROW) | |||||
static void init_cols(void); | |||||
static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row); | |||||
static void unselect_rows(void); | |||||
static void select_row(uint8_t row); | |||||
static void unselect_row(uint8_t row); | |||||
#elif (DIODE_DIRECTION == ROW2COL) | |||||
static void init_rows(void); | |||||
static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col); | |||||
static void unselect_cols(void); | |||||
static void unselect_col(uint8_t col); | |||||
static void select_col(uint8_t col); | |||||
#endif | |||||
__attribute__ ((weak)) | |||||
void matrix_init_kb(void) { | |||||
matrix_init_user(); | |||||
} | |||||
__attribute__ ((weak)) | |||||
void matrix_scan_kb(void) { | |||||
matrix_scan_user(); | |||||
} | |||||
__attribute__ ((weak)) | |||||
void matrix_init_user(void) { | |||||
} | |||||
__attribute__ ((weak)) | |||||
void matrix_scan_user(void) { | |||||
} | |||||
inline | |||||
uint8_t matrix_rows(void) | |||||
{ | |||||
return MATRIX_ROWS; | |||||
} | |||||
inline | |||||
uint8_t matrix_cols(void) | |||||
{ | |||||
return MATRIX_COLS; | |||||
} | |||||
void matrix_init(void) | |||||
{ | |||||
debug_enable = true; | |||||
debug_matrix = true; | |||||
debug_mouse = true; | |||||
// initialize row and col | |||||
#if (DIODE_DIRECTION == COL2ROW) | |||||
unselect_rows(); | |||||
init_cols(); | |||||
#elif (DIODE_DIRECTION == ROW2COL) | |||||
unselect_cols(); | |||||
init_rows(); | |||||
#endif | |||||
TX_RX_LED_INIT; | |||||
// initialize matrix state: all keys off | |||||
for (uint8_t i=0; i < MATRIX_ROWS; i++) { | |||||
matrix[i] = 0; | |||||
matrix_debouncing[i] = 0; | |||||
} | |||||
matrix_init_quantum(); | |||||
} | |||||
uint8_t _matrix_scan(void) | |||||
{ | |||||
int offset = isLeftHand ? 0 : (ROWS_PER_HAND); | |||||
#if (DIODE_DIRECTION == COL2ROW) | |||||
// Set row, read cols | |||||
for (uint8_t current_row = 0; current_row < ROWS_PER_HAND; current_row++) { | |||||
# if (DEBOUNCING_DELAY > 0) | |||||
bool matrix_changed = read_cols_on_row(matrix_debouncing+offset, current_row); | |||||
if (matrix_changed) { | |||||
debouncing = true; | |||||
debouncing_time = timer_read(); | |||||
} | |||||
# else | |||||
read_cols_on_row(matrix+offset, current_row); | |||||
# endif | |||||
} | |||||
#elif (DIODE_DIRECTION == ROW2COL) | |||||
// Set col, read rows | |||||
for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) { | |||||
# if (DEBOUNCING_DELAY > 0) | |||||
bool matrix_changed = read_rows_on_col(matrix_debouncing+offset, current_col); | |||||
if (matrix_changed) { | |||||
debouncing = true; | |||||
debouncing_time = timer_read(); | |||||
} | |||||
# else | |||||
read_rows_on_col(matrix+offset, current_col); | |||||
# endif | |||||
} | |||||
#endif | |||||
# if (DEBOUNCING_DELAY > 0) | |||||
if (debouncing && (timer_elapsed(debouncing_time) > DEBOUNCING_DELAY)) { | |||||
for (uint8_t i = 0; i < ROWS_PER_HAND; i++) { | |||||
matrix[i+offset] = matrix_debouncing[i+offset]; | |||||
} | |||||
debouncing = false; | |||||
} | |||||
# endif | |||||
return 1; | |||||
} | |||||
#ifdef USE_I2C | |||||
// Get rows from other half over i2c | |||||
int i2c_transaction(void) { | |||||
int slaveOffset = (isLeftHand) ? (ROWS_PER_HAND) : 0; | |||||
int err = i2c_master_start(SLAVE_I2C_ADDRESS + I2C_WRITE); | |||||
if (err) goto i2c_error; | |||||
// start of matrix stored at 0x00 | |||||
err = i2c_master_write(0x00); | |||||
if (err) goto i2c_error; | |||||
// Start read | |||||
err = i2c_master_start(SLAVE_I2C_ADDRESS + I2C_READ); | |||||
if (err) goto i2c_error; | |||||
if (!err) { | |||||
int i; | |||||
for (i = 0; i < ROWS_PER_HAND-1; ++i) { | |||||
matrix[slaveOffset+i] = i2c_master_read(I2C_ACK); | |||||
} | |||||
matrix[slaveOffset+i] = i2c_master_read(I2C_NACK); | |||||
i2c_master_stop(); | |||||
} else { | |||||
i2c_error: // the cable is disconnceted, or something else went wrong | |||||
i2c_reset_state(); | |||||
return err; | |||||
} | |||||
return 0; | |||||
} | |||||
#else // USE_SERIAL | |||||
int serial_transaction(void) { | |||||
int slaveOffset = (isLeftHand) ? (ROWS_PER_HAND) : 0; | |||||
if (serial_update_buffers()) { | |||||
return 1; | |||||
} | |||||
for (int i = 0; i < ROWS_PER_HAND; ++i) { | |||||
matrix[slaveOffset+i] = serial_slave_buffer[i]; | |||||
} | |||||
return 0; | |||||
} | |||||
#endif | |||||
uint8_t matrix_scan(void) | |||||
{ | |||||
uint8_t ret = _matrix_scan(); | |||||
#ifdef USE_I2C | |||||
if( i2c_transaction() ) { | |||||
#else // USE_SERIAL | |||||
if( serial_transaction() ) { | |||||
#endif | |||||
// turn on the indicator led when halves are disconnected | |||||
TXLED1; | |||||
error_count++; | |||||
if (error_count > ERROR_DISCONNECT_COUNT) { | |||||
// reset other half if disconnected | |||||
int slaveOffset = (isLeftHand) ? (ROWS_PER_HAND) : 0; | |||||
for (int i = 0; i < ROWS_PER_HAND; ++i) { | |||||
matrix[slaveOffset+i] = 0; | |||||
} | |||||
} | |||||
} else { | |||||
// turn off the indicator led on no error | |||||
TXLED0; | |||||
error_count = 0; | |||||
} | |||||
matrix_scan_quantum(); | |||||
return ret; | |||||
} | |||||
void matrix_slave_scan(void) { | |||||
_matrix_scan(); | |||||
int offset = (isLeftHand) ? 0 : ROWS_PER_HAND; | |||||
#ifdef USE_I2C | |||||
for (int i = 0; i < ROWS_PER_HAND; ++i) { | |||||
i2c_slave_buffer[i] = matrix[offset+i]; | |||||
} | |||||
#else // USE_SERIAL | |||||
for (int i = 0; i < ROWS_PER_HAND; ++i) { | |||||
serial_slave_buffer[i] = matrix[offset+i]; | |||||
} | |||||
#endif | |||||
} | |||||
bool matrix_is_modified(void) | |||||
{ | |||||
if (debouncing) return false; | |||||
return true; | |||||
} | |||||
inline | |||||
bool matrix_is_on(uint8_t row, uint8_t col) | |||||
{ | |||||
return (matrix[row] & ((matrix_row_t)1<<col)); | |||||
} | |||||
inline | |||||
matrix_row_t matrix_get_row(uint8_t row) | |||||
{ | |||||
return matrix[row]; | |||||
} | |||||
void matrix_print(void) | |||||
{ | |||||
print("\nr/c 0123456789ABCDEF\n"); | |||||
for (uint8_t row = 0; row < MATRIX_ROWS; row++) { | |||||
phex(row); print(": "); | |||||
pbin_reverse16(matrix_get_row(row)); | |||||
print("\n"); | |||||
} | |||||
} | |||||
uint8_t matrix_key_count(void) | |||||
{ | |||||
uint8_t count = 0; | |||||
for (uint8_t i = 0; i < MATRIX_ROWS; i++) { | |||||
count += bitpop16(matrix[i]); | |||||
} | |||||
return count; | |||||
} | |||||
#if (DIODE_DIRECTION == COL2ROW) | |||||
static void init_cols(void) | |||||
{ | |||||
for(uint8_t x = 0; x < MATRIX_COLS; x++) { | |||||
uint8_t pin = col_pins[x]; | |||||
_SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN | |||||
_SFR_IO8((pin >> 4) + 2) |= _BV(pin & 0xF); // HI | |||||
} | |||||
} | |||||
static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) | |||||
{ | |||||
// Store last value of row prior to reading | |||||
matrix_row_t last_row_value = current_matrix[current_row]; | |||||
// Clear data in matrix row | |||||
current_matrix[current_row] = 0; | |||||
// Select row and wait for row selecton to stabilize | |||||
select_row(current_row); | |||||
wait_us(30); | |||||
// For each col... | |||||
for(uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) { | |||||
// Select the col pin to read (active low) | |||||
uint8_t pin = col_pins[col_index]; | |||||
uint8_t pin_state = (_SFR_IO8(pin >> 4) & _BV(pin & 0xF)); | |||||
// Populate the matrix row with the state of the col pin | |||||
current_matrix[current_row] |= pin_state ? 0 : (ROW_SHIFTER << col_index); | |||||
} | |||||
// Unselect row | |||||
unselect_row(current_row); | |||||
return (last_row_value != current_matrix[current_row]); | |||||
} | |||||
static void select_row(uint8_t row) | |||||
{ | |||||
uint8_t pin = row_pins[row]; | |||||
_SFR_IO8((pin >> 4) + 1) |= _BV(pin & 0xF); // OUT | |||||
_SFR_IO8((pin >> 4) + 2) &= ~_BV(pin & 0xF); // LOW | |||||
} | |||||
static void unselect_row(uint8_t row) | |||||
{ | |||||
uint8_t pin = row_pins[row]; | |||||
_SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN | |||||
_SFR_IO8((pin >> 4) + 2) |= _BV(pin & 0xF); // HI | |||||
} | |||||
static void unselect_rows(void) | |||||
{ | |||||
for(uint8_t x = 0; x < ROWS_PER_HAND; x++) { | |||||
uint8_t pin = row_pins[x]; | |||||
_SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN | |||||
_SFR_IO8((pin >> 4) + 2) |= _BV(pin & 0xF); // HI | |||||
} | |||||
} | |||||
#elif (DIODE_DIRECTION == ROW2COL) | |||||
static void init_rows(void) | |||||
{ | |||||
for(uint8_t x = 0; x < ROWS_PER_HAND; x++) { | |||||
uint8_t pin = row_pins[x]; | |||||
_SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN | |||||
_SFR_IO8((pin >> 4) + 2) |= _BV(pin & 0xF); // HI | |||||
} | |||||
} | |||||
static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col) | |||||
{ | |||||
bool matrix_changed = false; | |||||
// Select col and wait for col selecton to stabilize | |||||
select_col(current_col); | |||||
wait_us(30); | |||||
// For each row... | |||||
for(uint8_t row_index = 0; row_index < ROWS_PER_HAND; row_index++) | |||||
{ | |||||
// Store last value of row prior to reading | |||||
matrix_row_t last_row_value = current_matrix[row_index]; | |||||
// Check row pin state | |||||
if ((_SFR_IO8(row_pins[row_index] >> 4) & _BV(row_pins[row_index] & 0xF)) == 0) | |||||
{ | |||||
// Pin LO, set col bit | |||||
current_matrix[row_index] |= (ROW_SHIFTER << current_col); | |||||
} | |||||
else | |||||
{ | |||||
// Pin HI, clear col bit | |||||
current_matrix[row_index] &= ~(ROW_SHIFTER << current_col); | |||||
} | |||||
// Determine if the matrix changed state | |||||
if ((last_row_value != current_matrix[row_index]) && !(matrix_changed)) | |||||
{ | |||||
matrix_changed = true; | |||||
} | |||||
} | |||||
// Unselect col | |||||
unselect_col(current_col); | |||||
return matrix_changed; | |||||
} | |||||
static void select_col(uint8_t col) | |||||
{ | |||||
uint8_t pin = col_pins[col]; | |||||
_SFR_IO8((pin >> 4) + 1) |= _BV(pin & 0xF); // OUT | |||||
_SFR_IO8((pin >> 4) + 2) &= ~_BV(pin & 0xF); // LOW | |||||
} | |||||
static void unselect_col(uint8_t col) | |||||
{ | |||||
uint8_t pin = col_pins[col]; | |||||
_SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN | |||||
_SFR_IO8((pin >> 4) + 2) |= _BV(pin & 0xF); // HI | |||||
} | |||||
static void unselect_cols(void) | |||||
{ | |||||
for(uint8_t x = 0; x < MATRIX_COLS; x++) { | |||||
uint8_t pin = col_pins[x]; | |||||
_SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN | |||||
_SFR_IO8((pin >> 4) + 2) |= _BV(pin & 0xF); // HI | |||||
} | |||||
} | |||||
#endif |
@ -1,228 +0,0 @@ | |||||
/* | |||||
* WARNING: be careful changing this code, it is very timing dependent | |||||
*/ | |||||
#ifndef F_CPU | |||||
#define F_CPU 16000000 | |||||
#endif | |||||
#include <avr/io.h> | |||||
#include <avr/interrupt.h> | |||||
#include <util/delay.h> | |||||
#include <stdbool.h> | |||||
#include "serial.h" | |||||
#ifdef USE_SERIAL | |||||
// Serial pulse period in microseconds. Its probably a bad idea to lower this | |||||
// value. | |||||
#define SERIAL_DELAY 24 | |||||
uint8_t volatile serial_slave_buffer[SERIAL_SLAVE_BUFFER_LENGTH] = {0}; | |||||
uint8_t volatile serial_master_buffer[SERIAL_MASTER_BUFFER_LENGTH] = {0}; | |||||
#define SLAVE_DATA_CORRUPT (1<<0) | |||||
volatile uint8_t status = 0; | |||||
inline static | |||||
void serial_delay(void) { | |||||
_delay_us(SERIAL_DELAY); | |||||
} | |||||
inline static | |||||
void serial_output(void) { | |||||
SERIAL_PIN_DDR |= SERIAL_PIN_MASK; | |||||
} | |||||
// make the serial pin an input with pull-up resistor | |||||
inline static | |||||
void serial_input(void) { | |||||
SERIAL_PIN_DDR &= ~SERIAL_PIN_MASK; | |||||
SERIAL_PIN_PORT |= SERIAL_PIN_MASK; | |||||
} | |||||
inline static | |||||
uint8_t serial_read_pin(void) { | |||||
return !!(SERIAL_PIN_INPUT & SERIAL_PIN_MASK); | |||||
} | |||||
inline static | |||||
void serial_low(void) { | |||||
SERIAL_PIN_PORT &= ~SERIAL_PIN_MASK; | |||||
} | |||||
inline static | |||||
void serial_high(void) { | |||||
SERIAL_PIN_PORT |= SERIAL_PIN_MASK; | |||||
} | |||||
void serial_master_init(void) { | |||||
serial_output(); | |||||
serial_high(); | |||||
} | |||||
void serial_slave_init(void) { | |||||
serial_input(); | |||||
// Enable INT0 | |||||
EIMSK |= _BV(INT0); | |||||
// Trigger on falling edge of INT0 | |||||
EICRA &= ~(_BV(ISC00) | _BV(ISC01)); | |||||
} | |||||
// Used by the master to synchronize timing with the slave. | |||||
static | |||||
void sync_recv(void) { | |||||
serial_input(); | |||||
// This shouldn't hang if the slave disconnects because the | |||||
// serial line will float to high if the slave does disconnect. | |||||
while (!serial_read_pin()); | |||||
serial_delay(); | |||||
} | |||||
// Used by the slave to send a synchronization signal to the master. | |||||
static | |||||
void sync_send(void) { | |||||
serial_output(); | |||||
serial_low(); | |||||
serial_delay(); | |||||
serial_high(); | |||||
} | |||||
// Reads a byte from the serial line | |||||
static | |||||
uint8_t serial_read_byte(void) { | |||||
uint8_t byte = 0; | |||||
serial_input(); | |||||
for ( uint8_t i = 0; i < 8; ++i) { | |||||
byte = (byte << 1) | serial_read_pin(); | |||||
serial_delay(); | |||||
_delay_us(1); | |||||
} | |||||
return byte; | |||||
} | |||||
// Sends a byte with MSB ordering | |||||
static | |||||
void serial_write_byte(uint8_t data) { | |||||
uint8_t b = 8; | |||||
serial_output(); | |||||
while( b-- ) { | |||||
if(data & (1 << b)) { | |||||
serial_high(); | |||||
} else { | |||||
serial_low(); | |||||
} | |||||
serial_delay(); | |||||
} | |||||
} | |||||
// interrupt handle to be used by the slave device | |||||
ISR(SERIAL_PIN_INTERRUPT) { | |||||
sync_send(); | |||||
uint8_t checksum = 0; | |||||
for (int i = 0; i < SERIAL_SLAVE_BUFFER_LENGTH; ++i) { | |||||
serial_write_byte(serial_slave_buffer[i]); | |||||
sync_send(); | |||||
checksum += serial_slave_buffer[i]; | |||||
} | |||||
serial_write_byte(checksum); | |||||
sync_send(); | |||||
// wait for the sync to finish sending | |||||
serial_delay(); | |||||
// read the middle of pulses | |||||
_delay_us(SERIAL_DELAY/2); | |||||
uint8_t checksum_computed = 0; | |||||
for (int i = 0; i < SERIAL_MASTER_BUFFER_LENGTH; ++i) { | |||||
serial_master_buffer[i] = serial_read_byte(); | |||||
sync_send(); | |||||
checksum_computed += serial_master_buffer[i]; | |||||
} | |||||
uint8_t checksum_received = serial_read_byte(); | |||||
sync_send(); | |||||
serial_input(); // end transaction | |||||
if ( checksum_computed != checksum_received ) { | |||||
status |= SLAVE_DATA_CORRUPT; | |||||
} else { | |||||
status &= ~SLAVE_DATA_CORRUPT; | |||||
} | |||||
} | |||||
inline | |||||
bool serial_slave_DATA_CORRUPT(void) { | |||||
return status & SLAVE_DATA_CORRUPT; | |||||
} | |||||
// Copies the serial_slave_buffer to the master and sends the | |||||
// serial_master_buffer to the slave. | |||||
// | |||||
// Returns: | |||||
// 0 => no error | |||||
// 1 => slave did not respond | |||||
int serial_update_buffers(void) { | |||||
// this code is very time dependent, so we need to disable interrupts | |||||
cli(); | |||||
// signal to the slave that we want to start a transaction | |||||
serial_output(); | |||||
serial_low(); | |||||
_delay_us(1); | |||||
// wait for the slaves response | |||||
serial_input(); | |||||
serial_high(); | |||||
_delay_us(SERIAL_DELAY); | |||||
// check if the slave is present | |||||
if (serial_read_pin()) { | |||||
// slave failed to pull the line low, assume not present | |||||
sei(); | |||||
return 1; | |||||
} | |||||
// if the slave is present syncronize with it | |||||
sync_recv(); | |||||
uint8_t checksum_computed = 0; | |||||
// receive data from the slave | |||||
for (int i = 0; i < SERIAL_SLAVE_BUFFER_LENGTH; ++i) { | |||||
serial_slave_buffer[i] = serial_read_byte(); | |||||
sync_recv(); | |||||
checksum_computed += serial_slave_buffer[i]; | |||||
} | |||||
uint8_t checksum_received = serial_read_byte(); | |||||
sync_recv(); | |||||
if (checksum_computed != checksum_received) { | |||||
sei(); | |||||
return 1; | |||||
} | |||||
uint8_t checksum = 0; | |||||
// send data to the slave | |||||
for (int i = 0; i < SERIAL_MASTER_BUFFER_LENGTH; ++i) { | |||||
serial_write_byte(serial_master_buffer[i]); | |||||
sync_recv(); | |||||
checksum += serial_master_buffer[i]; | |||||
} | |||||
serial_write_byte(checksum); | |||||
sync_recv(); | |||||
// always, release the line when not in use | |||||
serial_output(); | |||||
serial_high(); | |||||
sei(); | |||||
return 0; | |||||
} | |||||
#endif |
@ -1,26 +0,0 @@ | |||||
#ifndef MY_SERIAL_H | |||||
#define MY_SERIAL_H | |||||
#include "config.h" | |||||
#include <stdbool.h> | |||||
/* TODO: some defines for interrupt setup */ | |||||
#define SERIAL_PIN_DDR DDRD | |||||
#define SERIAL_PIN_PORT PORTD | |||||
#define SERIAL_PIN_INPUT PIND | |||||
#define SERIAL_PIN_MASK _BV(PD0) | |||||
#define SERIAL_PIN_INTERRUPT INT0_vect | |||||
#define SERIAL_SLAVE_BUFFER_LENGTH MATRIX_ROWS/2 | |||||
#define SERIAL_MASTER_BUFFER_LENGTH 1 | |||||
// Buffers for master - slave communication | |||||
extern volatile uint8_t serial_slave_buffer[SERIAL_SLAVE_BUFFER_LENGTH]; | |||||
extern volatile uint8_t serial_master_buffer[SERIAL_MASTER_BUFFER_LENGTH]; | |||||
void serial_master_init(void); | |||||
void serial_slave_init(void); | |||||
int serial_update_buffers(void); | |||||
bool serial_slave_data_corrupt(void); | |||||
#endif |
@ -1,86 +0,0 @@ | |||||
#include <avr/io.h> | |||||
#include <avr/wdt.h> | |||||
#include <avr/power.h> | |||||
#include <avr/interrupt.h> | |||||
#include <util/delay.h> | |||||
#include <avr/eeprom.h> | |||||
#include "split_util.h" | |||||
#include "matrix.h" | |||||
#include "keyboard.h" | |||||
#include "config.h" | |||||
#include "timer.h" | |||||
#ifdef USE_I2C | |||||
# include "i2c.h" | |||||
#else | |||||
# include "serial.h" | |||||
#endif | |||||
volatile bool isLeftHand = true; | |||||
static void setup_handedness(void) { | |||||
#ifdef EE_HANDS | |||||
isLeftHand = eeprom_read_byte(EECONFIG_HANDEDNESS); | |||||
#else | |||||
// I2C_MASTER_RIGHT is deprecated, use MASTER_RIGHT instead, since this works for both serial and i2c | |||||
#if defined(I2C_MASTER_RIGHT) || defined(MASTER_RIGHT) | |||||
isLeftHand = !has_usb(); | |||||
#else | |||||
isLeftHand = has_usb(); | |||||
#endif | |||||
#endif | |||||
} | |||||
static void keyboard_master_setup(void) { | |||||
#ifdef USE_I2C | |||||
i2c_master_init(); | |||||
#ifdef SSD1306OLED | |||||
matrix_master_OLED_init (); | |||||
#endif | |||||
#else | |||||
serial_master_init(); | |||||
#endif | |||||
} | |||||
static void keyboard_slave_setup(void) { | |||||
timer_init(); | |||||
#ifdef USE_I2C | |||||
i2c_slave_init(SLAVE_I2C_ADDRESS); | |||||
#else | |||||
serial_slave_init(); | |||||
#endif | |||||
} | |||||
bool has_usb(void) { | |||||
USBCON |= (1 << OTGPADE); //enables VBUS pad | |||||
_delay_us(5); | |||||
return (USBSTA & (1<<VBUS)); //checks state of VBUS | |||||
} | |||||
void split_keyboard_setup(void) { | |||||
setup_handedness(); | |||||
if (has_usb()) { | |||||
keyboard_master_setup(); | |||||
} else { | |||||
keyboard_slave_setup(); | |||||
} | |||||
sei(); | |||||
} | |||||
void keyboard_slave_loop(void) { | |||||
matrix_init(); | |||||
while (1) { | |||||
matrix_slave_scan(); | |||||
} | |||||
} | |||||
// this code runs before the usb and keyboard is initialized | |||||
void matrix_setup(void) { | |||||
split_keyboard_setup(); | |||||
if (!has_usb()) { | |||||
keyboard_slave_loop(); | |||||
} | |||||
} |
@ -1,21 +0,0 @@ | |||||
#ifndef SPLIT_KEYBOARD_UTIL_H | |||||
#define SPLIT_KEYBOARD_UTIL_H | |||||
#include <stdbool.h> | |||||
#include "eeconfig.h" | |||||
#define SLAVE_I2C_ADDRESS 0x32 | |||||
extern volatile bool isLeftHand; | |||||
// slave version of matix scan, defined in matrix.c | |||||
void matrix_slave_scan(void); | |||||
void split_keyboard_setup(void); | |||||
bool has_usb(void); | |||||
void keyboard_slave_loop(void); | |||||
void matrix_master_OLED_init (void); | |||||
#endif |