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-rw-r--r--tmk_core/common/uart.c172
-rw-r--r--tmk_core/common/uart.h8
2 files changed, 0 insertions, 180 deletions
diff --git a/tmk_core/common/uart.c b/tmk_core/common/uart.c
deleted file mode 100644
index 150e256c8..000000000
--- a/tmk_core/common/uart.c
+++ /dev/null
@@ -1,172 +0,0 @@
1// TODO: Teensy support(ATMega32u4/AT90USB128)
2// Fixed for Arduino Duemilanove ATmega168p by Jun Wako
3/* UART Example for Teensy USB Development Board
4 * http://www.pjrc.com/teensy/
5 * Copyright (c) 2009 PJRC.COM, LLC
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
23 * THE SOFTWARE.
24 */
25
26// Version 1.0: Initial Release
27// Version 1.1: Add support for Teensy 2.0, minor optimizations
28
29#include <avr/io.h>
30#include <avr/interrupt.h>
31
32#include "uart.h"
33
34#if defined(__AVR_ATmega168__) || defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328P__) || defined(__AVR_ATmega328__)
35# define UDRn UDR0
36# define UBRRnL UBRR0L
37# define UCSRnA UCSR0A
38# define UCSRnB UCSR0B
39# define UCSRnC UCSR0C
40# define U2Xn U2X0
41# define RXENn RXEN0
42# define TXENn TXEN0
43# define RXCIEn RXCIE0
44# define UCSZn1 UCSZ01
45# define UCSZn0 UCSZ00
46# define UDRIEn UDRIE0
47# define USARTn_UDRE_vect USART_UDRE_vect
48# define USARTn_RX_vect USART_RX_vect
49#elif defined(__AVR_ATmega32U4__) || defined(__AVR_ATmega32U2__) || defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__)
50# define UDRn UDR1
51# define UBRRnL UBRR1L
52# define UCSRnA UCSR1A
53# define UCSRnB UCSR1B
54# define UCSRnC UCSR1C
55# define U2Xn U2X1
56# define RXENn RXEN1
57# define TXENn TXEN1
58# define RXCIEn RXCIE1
59# define UCSZn1 UCSZ11
60# define UCSZn0 UCSZ10
61# define UDRIEn UDRIE1
62# define USARTn_UDRE_vect USART1_UDRE_vect
63# define USARTn_RX_vect USART1_RX_vect
64#elif defined(__AVR_ATmega32A__)
65# define UDRn UDR
66# define UBRRnL UBRRL
67# define UCSRnA UCSRA
68# define UCSRnB UCSRB
69# define UCSRnC UCSRC
70# define U2Xn U2X
71# define RXENn RXEN
72# define TXENn TXEN
73# define RXCIEn RXCIE
74# define UCSZn1 UCSZ1
75# define UCSZn0 UCSZ0
76# define UDRIEn UDRIE
77# define USARTn_UDRE_vect USART_UDRE_vect
78# define USARTn_RX_vect USART_RX_vect
79#endif
80
81// These buffers may be any size from 2 to 256 bytes.
82#define RX_BUFFER_SIZE 64
83#define TX_BUFFER_SIZE 256
84
85static volatile uint8_t tx_buffer[TX_BUFFER_SIZE];
86static volatile uint8_t tx_buffer_head;
87static volatile uint8_t tx_buffer_tail;
88static volatile uint8_t rx_buffer[RX_BUFFER_SIZE];
89static volatile uint8_t rx_buffer_head;
90static volatile uint8_t rx_buffer_tail;
91
92// Initialize the UART
93void uart_init(uint32_t baud) {
94 cli();
95 UBRRnL = (F_CPU / 4 / baud - 1) / 2;
96 UCSRnA = (1 << U2Xn);
97 UCSRnB = (1 << RXENn) | (1 << TXENn) | (1 << RXCIEn);
98 UCSRnC = (1 << UCSZn1) | (1 << UCSZn0);
99 tx_buffer_head = tx_buffer_tail = 0;
100 rx_buffer_head = rx_buffer_tail = 0;
101 sei();
102}
103
104// Transmit a byte
105void uart_putchar(uint8_t c) {
106 uint8_t i;
107
108 i = tx_buffer_head + 1;
109 if (i >= TX_BUFFER_SIZE) i = 0;
110 // return immediately to avoid deadlock when interrupt is disabled(called from ISR)
111 if (tx_buffer_tail == i && (SREG & (1 << SREG_I)) == 0) return;
112 while (tx_buffer_tail == i)
113 ; // wait until space in buffer
114 // cli();
115 tx_buffer[i] = c;
116 tx_buffer_head = i;
117 UCSRnB = (1 << RXENn) | (1 << TXENn) | (1 << RXCIEn) | (1 << UDRIEn);
118 // sei();
119}
120
121// Receive a byte
122uint8_t uart_getchar(void) {
123 uint8_t c, i;
124
125 while (rx_buffer_head == rx_buffer_tail)
126 ; // wait for character
127 i = rx_buffer_tail + 1;
128 if (i >= RX_BUFFER_SIZE) i = 0;
129 c = rx_buffer[i];
130 rx_buffer_tail = i;
131 return c;
132}
133
134// Return the number of bytes waiting in the receive buffer.
135// Call this before uart_getchar() to check if it will need
136// to wait for a byte to arrive.
137uint8_t uart_available(void) {
138 uint8_t head, tail;
139
140 head = rx_buffer_head;
141 tail = rx_buffer_tail;
142 if (head >= tail) return head - tail;
143 return RX_BUFFER_SIZE + head - tail;
144}
145
146// Transmit Interrupt
147ISR(USARTn_UDRE_vect) {
148 uint8_t i;
149
150 if (tx_buffer_head == tx_buffer_tail) {
151 // buffer is empty, disable transmit interrupt
152 UCSRnB = (1 << RXENn) | (1 << TXENn) | (1 << RXCIEn);
153 } else {
154 i = tx_buffer_tail + 1;
155 if (i >= TX_BUFFER_SIZE) i = 0;
156 UDRn = tx_buffer[i];
157 tx_buffer_tail = i;
158 }
159}
160
161// Receive Interrupt
162ISR(USARTn_RX_vect) {
163 uint8_t c, i;
164
165 c = UDRn;
166 i = rx_buffer_head + 1;
167 if (i >= RX_BUFFER_SIZE) i = 0;
168 if (i != rx_buffer_tail) {
169 rx_buffer[i] = c;
170 rx_buffer_head = i;
171 }
172}
diff --git a/tmk_core/common/uart.h b/tmk_core/common/uart.h
deleted file mode 100644
index ea247b17b..000000000
--- a/tmk_core/common/uart.h
+++ /dev/null
@@ -1,8 +0,0 @@
1#pragma once
2
3#include <stdint.h>
4
5void uart_init(uint32_t baud);
6void uart_putchar(uint8_t c);
7uint8_t uart_getchar(void);
8uint8_t uart_available(void);
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