core: Fix uart.c for ATmega32U4

[max/tmk_keyboard.git] / tmk_core / common / uart.c

diff --git a/tmk_core/common/uart.c b/tmk_core/common/uart.c
deleted file mode 100644 (file)
index c17649b..0000000
--- a/tmk_core/common/uart.c
+++ /dev/null
@@ -1,129 +0,0 @@
-// TODO: Teensy support(ATMega32u4/AT90USB128)
-// Fixed for Arduino Duemilanove ATmega168p by Jun Wako
-/* UART Example for Teensy USB Development Board
- * http://www.pjrc.com/teensy/
- * Copyright (c) 2009 PJRC.COM, LLC
- * 
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- * 
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- * 
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-
-// Version 1.0: Initial Release
-// Version 1.1: Add support for Teensy 2.0, minor optimizations
-
-
-#include <avr/io.h>
-#include <avr/interrupt.h>
-
-#include "uart.h"
-
-// These buffers may be any size from 2 to 256 bytes.
-#define RX_BUFFER_SIZE 64
-#define TX_BUFFER_SIZE 40
-
-static volatile uint8_t tx_buffer[TX_BUFFER_SIZE];
-static volatile uint8_t tx_buffer_head;
-static volatile uint8_t tx_buffer_tail;
-static volatile uint8_t rx_buffer[RX_BUFFER_SIZE];
-static volatile uint8_t rx_buffer_head;
-static volatile uint8_t rx_buffer_tail;
-
-// Initialize the UART
-void uart_init(uint32_t baud)
-{
-       cli();
-       UBRR0 = (F_CPU / 4 / baud - 1) / 2;
-       UCSR0A = (1<<U2X0);
-       UCSR0B = (1<<RXEN0) | (1<<TXEN0) | (1<<RXCIE0);
-       UCSR0C = (1<<UCSZ01) | (1<<UCSZ00);
-       tx_buffer_head = tx_buffer_tail = 0;
-       rx_buffer_head = rx_buffer_tail = 0;
-       sei();
-}
-
-// Transmit a byte
-void uart_putchar(uint8_t c)
-{
-       uint8_t i;
-
-       i = tx_buffer_head + 1;
-       if (i >= TX_BUFFER_SIZE) i = 0;
-       while (tx_buffer_tail == i) ; // wait until space in buffer
-       //cli();
-       tx_buffer[i] = c;
-       tx_buffer_head = i;
-       UCSR0B = (1<<RXEN0) | (1<<TXEN0) | (1<<RXCIE0) | (1<<UDRIE0);
-       //sei();
-}
-
-// Receive a byte
-uint8_t uart_getchar(void)
-{
-        uint8_t c, i;
-
-       while (rx_buffer_head == rx_buffer_tail) ; // wait for character
-        i = rx_buffer_tail + 1;
-        if (i >= RX_BUFFER_SIZE) i = 0;
-        c = rx_buffer[i];
-        rx_buffer_tail = i;
-        return c;
-}
-
-// Return the number of bytes waiting in the receive buffer.
-// Call this before uart_getchar() to check if it will need
-// to wait for a byte to arrive.
-uint8_t uart_available(void)
-{
-       uint8_t head, tail;
-
-       head = rx_buffer_head;
-       tail = rx_buffer_tail;
-       if (head >= tail) return head - tail;
-       return RX_BUFFER_SIZE + head - tail;
-}
-
-// Transmit Interrupt
-ISR(USART_UDRE_vect)
-{
-       uint8_t i;
-
-       if (tx_buffer_head == tx_buffer_tail) {
-               // buffer is empty, disable transmit interrupt
-               UCSR0B = (1<<RXEN0) | (1<<TXEN0) | (1<<RXCIE0);
-       } else {
-               i = tx_buffer_tail + 1;
-               if (i >= TX_BUFFER_SIZE) i = 0;
-               UDR0 = tx_buffer[i];
-               tx_buffer_tail = i;
-       }
-}
-
-// Receive Interrupt
-ISR(USART_RX_vect)
-{
-       uint8_t c, i;
-
-       c = UDR0;
-       i = rx_buffer_head + 1;
-       if (i >= RX_BUFFER_SIZE) i = 0;
-       if (i != rx_buffer_tail) {
-               rx_buffer[i] = c;
-               rx_buffer_head = i;
-       }
-}
-