4 * Copyright (C) 2013-06-20 K.Ohta <whatisthis.sowhat ai gmail.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2,
9 * or (at your option) any later version.
10 * This library / program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
13 * See the GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this library; see the file COPYING. If not, write to the
17 * Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
20 * As a special exception, if you link this(includeed from sdcc) library
21 * with other files, some of which are compiled with SDCC,
22 * to produce an executable, this library does not by itself cause
23 * the resulting executable to be covered by the GNU General Public License.
24 * This exception does not however invalidate any other reasons why
25 * the executable file might be covered by the GNU General Public License.
30 #include <pic18fregs.h> /* ONLY FOR PIC18x */
42 static char uart_rfifo[UART_BUF_SIZE];
44 static unsigned int uart_rx_rptr;
45 static unsigned int uart_rx_wptr;
46 static int uart_rx_bytes;
47 static unsigned char uart_rx_sts;
48 static unsigned char uart_rx_xon;
49 static unsigned char uart_tx_xon;
51 static unsigned char uart_rx_wakeup;
57 IPR1bits.TX1IP = 0; // Low
58 IPR1bits.RC1IP = 1; // High
59 RCSTA = 0b00010000; //SPEN, 8bit, ASYNC, CREN
60 BAUDCON = 0b00001011; // IDLE High, BRG16, ABDEN, WUE
61 TXSTA = 0b00100000; //8bit, ASYNC, TXEN, Break
67 void uart_wakeup(void)
71 IPR1bits.TX1IP = 0; // Low
72 IPR1bits.RC1IP = 1; // High
73 RCSTA = 0b10010000; //SPEN, 8bit, ASYNC, CREN
74 BAUDCON = 0b00001011; // IDLE High, BRG16, ABDEN, WUE
75 TXSTA = 0b00100000; //8bit, ASYNC, TXEN, Break
92 void uart_inthdr_rx(void)
96 if(uart_rx_wakeup == 0){
97 if(BAUDCONbits.WUE != 1){ // Okay, Wakeup interrupt
98 uart_rx_wakeup = 0xff;
102 if(BAUDCONbits.ABDEN == 1) { // Still configure baudrate
106 if(RCSTAbits.OERR == 0) {
107 if(RCSTAbits.FERR == 0) {
108 uart_rx_sts = 0; // Clear error
110 if(c == UART_CH_XOFF) {
111 uart_tx_xon = 0; // XOFF Sequence for TX
112 } else if(c == UART_CH_XON) { // XON Sequence for TX
114 } else if(uart_rx_bytes < UART_BUF_SIZE) { //
115 uart_rfifo[uart_rx_wptr++] = c;
116 if(uart_rx_wptr >= UART_BUF_SIZE) uart_rx_wptr = 0;
118 if(uart_rx_bytes >= UART_BUF_SIZE) uart_rx_bytes = UART_BUF_SIZE;
120 } else { // Frame Error
121 uart_rx_sts != UART_FRAMEERROR;
124 uart_rx_sts != UART_OVERFLOW;
133 * Pull char from RX FIFO.
135 unsigned char uart_pullchar(void)
138 while(PIR1bits.RC1IF == 1) {
139 idle(100); // Wait for RX completed
141 if(uart_rx_bytes <= 0) return 0; // EMPTY
142 c = uart_rfifo[uart_rx_rptr++];
143 if(uart_rx_rptr > UART_BUF_SIZE) uart_rx_rptr = 0;
145 if(uart_rx_bytes <= 0) uart_rx_bytes = 0;
149 unsigned char uart_pushchar(unsigned char c, unsigned int timeout)
153 for(i = timeout; i > 0; i--){
154 if((uart_tx_xon != 0) && (TXSTAbits.TRMT1 == 1)) break;
157 if(i != 0) goto _l1; // Send and return;
158 return UART_TIMEOUT; // Timeout
160 if((TXSTAbits.TRMT1 == 0) || (uart_tx_xon == 0)) return UART_TIMEOUT; // If timeout=0 return immidiately.
166 void uart_pushxon(unsigned int timeout)
169 if(uart_rx_wakeup == 0) return;
171 for(i = timeout; i > 0; i--){
172 if(TXSTAbits.TRMT1 == 1) break;
177 while(TXSTAbits.TRMT1 == 0) idle(100);
182 void uart_pushxoff(unsigned int timeout)
185 if(uart_rx_wakeup == 0) return;
187 for(i = timeout; i > 0; i--){
188 if(TXSTAbits.TRMT1 == 1) break;
193 while(TXSTAbits.TRMT1 == 0) idle(100);
195 TXREG = UART_CH_XOFF;
198 void uart_break(void)
200 TXSTAbits.SENDB1 = 1;
203 unsigned char uart_getstat(void)
205 unsigned char s = uart_rx_sts;
206 if(uart_rx_wakeup != 0) s |= UART_WAKEUP;