1 files changed, 0 insertions, 103 deletions
diff --git a/kernel/io/usart.c b/kernel/io/usart.c
deleted file mode 100644
index 2046630..0000000
--- a/kernel/io/usart.c
+++ /dev/null
@@ -1,103 +0,0 @@
-
-#include <stddef.h>
-#include <stdio.h>
-#include <avr/interrupt.h>
-#include "task/sched.h"
-#include "io/usart.h"
-#include "bug/debug.h"
-#include "mcu/task/context.h"
-
-static struct usart_device_t umain = USART_DEVICE_INIT(umain);
-static int umain_putc(char c);
-static int umain_getc();
-
-FILE umain_out = FDEV_SETUP_STREAM(umain_putc, NULL, _FDEV_SETUP_WRITE);
-FILE umain_in = FDEV_SETUP_STREAM(NULL, umain_getc, _FDEV_SETUP_READ);
-
-void usart_init(unsigned long baud) {
-  UCSR0A |= (1 << U2X0);   //enable double speed transmission
-  uint16_t baud_setting = (F_CPU / 4 / baud - 1) / 2;
-  UBRR0H = baud_setting >> 8;
-  UBRR0L = baud_setting;
-  UCSR0B |= (1 << RXEN0) | (1 << TXEN0) | (1 << RXCIE0); // 8-bit, no parity, 1 stop bit
-  UCSR0B &= ~(1 << UDRIE0);
-  stdout = &umain_out;
-  stdin = &umain_in;
-}
-
-int umain_putc(char c) {
-  if (c == '\n') umain_putc('\r');
-  int r = 0;
-  do {
-    cli();
-    r = rbuffer_write_char(&umain.tx_buffer, c);
-    sei();
-    UCSR0B |= (1 << UDRIE0);
-  } while (r != 1);
-  return c;
-}
-
-int umain_getc() {
-  while (rbuffer_empty(&umain.rx_buffer)) {
-    cli();
-    sleep_queue(&umain.rx_queue);
-    yield();
-  }
-  cli();
-  char c = 0;
-  size_t r = rbuffer_read_char(&umain.rx_buffer, &c);
-  sei();
-  if (r) return (int) c;
-  else return EOF;
-}
-
-//called when byte is received
-ISR(USART0_RX_vect, ISR_NAKED) {
-  context_save();
-  char c = UDR0;
-  rbuffer_write_char(&umain.rx_buffer, c);
-  wake_all_queue(&umain.rx_queue);
-  context_restore();
-  asm volatile ("reti");
-}
-
-//called when data register is empty
-ISR(USART0_UDRE_vect) {
-  char c;
-  if (rbuffer_read_char(&umain.tx_buffer, &c)) {
-    UDR0 = c;
-  } else {
-    UCSR0B &= ~(1 << UDRIE0); //buffer empty, disable interruot
-  }
-}
-
-/*
-void serial_read() {
-  ENTER_CRITICAL();
-  list_move_tail(&current->list, &serial_rx_q);
-  EXIT_CRITICAL();
-  yield();
-}
-*/
-/*
-void serial_write_str(const char* const str) {
-  for (size_t i = 0; str[i] != '\0'; ++i) {
-    ENTER_CRITICAL();
-    rbuffer_write(&serial_dev.tx_buffer, str[i]);
-    EXIT_CRITICAL();
-    UCSR0B |= (1 << UDRIE0);
-  }
-}*/
-
-
-/*
-ISR(INT3_vect, ISR_NAKED) {
-  SAVE_CONTEXT();
-  if (!list_empty(&serial_rx_q)) {
-    list_move_tail(serial_rx_q.next, &ready);
-  }
-  schedule();
-  RESTORE_CONTEXT();
-  asm volatile ("reti");
-}
-*/