1 files changed, 0 insertions, 228 deletions
diff --git a/keyboards/lets_split/serial.c b/keyboards/lets_split/serial.c
deleted file mode 100644
index 74bcbb6bf..000000000
--- a/keyboards/lets_split/serial.c
+++ /dev/null
@@ -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"
-
-#ifndef USE_I2C
-
-// 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