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 = 0b10010000; //SPEN, 8bit, ASYNC, CREN = 0
60 BAUDCON = 0b00001010; // IDLE High, BRG16, ABDEN, WUE
61 TXSTA = 0b00100000; //8bit, ASYNC, TXEN, Break
69 void uart_wakeup(void)
73 IPR1bits.TX1IP = 0; // Low
74 IPR1bits.RC1IP = 1; // High
75 RCSTA = 0b10010000; //SPEN, 8bit, ASYNC, CREN
76 BAUDCON = 0b00001010; // IDLE High, BRG16, ABDEN, WUE
77 TXSTA = 0b00100000; //8bit, ASYNC, TXEN, Break
80 // uart_rx_wakeup = 0xff;
97 void uart_inthdr_rx(void)
101 if(uart_rx_wakeup == 0){
102 if(BAUDCONbits.WUE != 1){ // Okay, Wakeup interrupt
103 uart_rx_wakeup = 0xff;
107 if(BAUDCONbits.ABDEN == 1) { // Still configure baudrate
111 if(RCSTAbits.OERR == 0) {
112 if(RCSTAbits.FERR == 0) {
113 uart_rx_sts = 0; // Clear error
115 if(c == UART_CH_XOFF) {
116 uart_tx_xon = 0; // XOFF Sequence for TX
117 } else if(c == UART_CH_XON) { // XON Sequence for TX
119 } else { //if(uart_rx_bytes < UART_BUF_SIZE) { //
120 uart_rfifo[uart_rx_wptr++] = c;
121 if(uart_rx_wptr >= UART_BUF_SIZE) uart_rx_wptr = 0;
123 if(uart_rx_bytes >= UART_BUF_SIZE) uart_rx_bytes = UART_BUF_SIZE;
124 // uart_pushchar(c, 0x0000);
126 } else { // Frame Error
127 uart_rx_sts != UART_FRAMEERROR;
130 uart_rx_sts != UART_OVERFLOW;
140 * Pull char from RX FIFO.
142 unsigned char uart_pullchar(void)
145 while(PIR1bits.RC1IF == 1) {
146 idle(100); // Wait for RX completed
148 if(uart_rx_bytes <= 0) return 0; // EMPTY
149 c = uart_rfifo[uart_rx_rptr++];
150 if(uart_rx_rptr > UART_BUF_SIZE) uart_rx_rptr = 0;
152 if(uart_rx_bytes <= 0) uart_rx_bytes = 0;
156 unsigned char uart_pushchar(unsigned char c, unsigned int timeout)
160 for(i = timeout; i > 0; i--){
161 if((uart_tx_xon != 0) && (TXSTAbits.TRMT1 == 1)) break;
164 if(i != 0) goto _l1; // Send and return;
165 return UART_TIMEOUT; // Timeout
167 if((TXSTAbits.TRMT1 == 0) || (uart_tx_xon == 0)) return UART_TIMEOUT; // If timeout=0 return immidiately.
173 void uart_pushxon(unsigned int timeout)
176 if(uart_rx_wakeup == 0) return;
178 for(i = timeout; i > 0; i--){
179 if(TXSTAbits.TRMT1 == 1) break;
184 while(TXSTAbits.TRMT1 == 0) idle(100);
189 void uart_pushxoff(unsigned int timeout)
192 if(uart_rx_wakeup == 0) return;
194 for(i = timeout; i > 0; i--){
195 if(TXSTAbits.TRMT1 == 1) break;
200 while(TXSTAbits.TRMT1 == 0) idle(100);
202 TXREG = UART_CH_XOFF;
205 void uart_break(void)
207 TXSTAbits.SENDB1 = 1;
210 unsigned char uart_getstat(void)
212 unsigned char s = uart_rx_sts;
213 if(uart_rx_wakeup != 0) s |= UART_WAKEUP;