Details | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
2136 | - | 1 | /************************************************************************* |
2 | Title: Interrupt UART library with receive/transmit circular buffers |
||
3 | Author: Peter Fleury <pfleury@gmx.ch> http://jump.to/fleury |
||
4 | File: $Id: uart.c,v 1.6.2.2 2009/11/29 08:56:12 Peter Exp $ |
||
5 | Software: AVR-GCC 4.1, AVR Libc 1.4.6 or higher |
||
6 | Hardware: any AVR with built-in UART, |
||
7 | License: GNU General Public License |
||
8 | |||
9 | DESCRIPTION: |
||
10 | An interrupt is generated when the UART has finished transmitting or |
||
11 | receiving a byte. The interrupt handling routines use circular buffers |
||
12 | for buffering received and transmitted data. |
||
13 | |||
14 | The UART_RX_BUFFER_SIZE and UART_TX_BUFFER_SIZE variables define |
||
15 | the buffer size in bytes. Note that these variables must be a |
||
16 | power of 2. |
||
17 | |||
18 | USAGE: |
||
19 | Refere to the header file uart.h for a description of the routines. |
||
20 | See also example test_uart.c. |
||
21 | |||
22 | NOTES: |
||
23 | Based on Atmel Application Note AVR306 |
||
24 | |||
25 | LICENSE: |
||
26 | Copyright (C) 2006 Peter Fleury |
||
27 | |||
28 | This program is free software; you can redistribute it and/or modify |
||
29 | it under the terms of the GNU General Public License as published by |
||
30 | the Free Software Foundation; either version 2 of the License, or |
||
31 | any later version. |
||
32 | |||
33 | This program is distributed in the hope that it will be useful, |
||
34 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
||
35 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
||
36 | GNU General Public License for more details. |
||
37 | |||
38 | *************************************************************************/ |
||
39 | |||
40 | //############################################################################ |
||
41 | //# HISTORY uart1.c |
||
42 | //# |
||
43 | //# 08.08.2015 CB |
||
44 | //# - chg: Umbau ISR(USART1_RX_vect) um Behandlung der NMEA Datensätze |
||
45 | //# |
||
46 | //# 06.08.2015 CB |
||
47 | //# - add: uint8_t receiveNMEA // Flag zur Empfangssteuerung in ISR(USART1_RX_vect) |
||
48 | //# - add: Erweiterung ISR(USART1_RX_vect) um Behandlung der NMEA Datensätze |
||
49 | //# |
||
50 | //# 26.06.2014 OG |
||
51 | //# - del: receiveNMEA |
||
52 | //# |
||
53 | //# 04.07.2013 Cebra |
||
54 | //# - add: neue Funktion uart1_peek |
||
55 | //############################################################################ |
||
56 | |||
57 | |||
58 | #include <avr/io.h> |
||
59 | #include <avr/interrupt.h> |
||
60 | #include <avr/pgmspace.h> |
||
61 | #include <string.h> |
||
62 | #include <stdbool.h> |
||
63 | #include "uart1.h" |
||
64 | #include "usart.h" |
||
65 | #include "../main.h" |
||
66 | #include "../bluetooth/bluetooth.h" |
||
67 | #include "../tracking/tracking.h" |
||
68 | #include "../avr-nmea-gps-library/nmea.h" |
||
69 | |||
70 | // |
||
71 | // constants and macros |
||
72 | // |
||
73 | |||
74 | |||
75 | // size of RX/TX buffers |
||
76 | #define UART_RX_BUFFER_MASK ( UART_RX_BUFFER_SIZE - 1) |
||
77 | #define UART_TX_BUFFER_MASK ( UART_TX_BUFFER_SIZE - 1) |
||
78 | |||
79 | #if ( UART_RX_BUFFER_SIZE & UART_RX_BUFFER_MASK ) |
||
80 | #error RX buffer size is not a power of 2 |
||
81 | #endif |
||
82 | |||
83 | #if ( UART_TX_BUFFER_SIZE & UART_TX_BUFFER_MASK ) |
||
84 | #error TX buffer size is not a power of 2 |
||
85 | #endif |
||
86 | |||
87 | |||
88 | // ATmega with two USART |
||
89 | |||
90 | #define ATMEGA_USART1 |
||
91 | |||
92 | #define UART1_STATUS UCSR1A |
||
93 | #define UART1_CONTROL UCSR1B |
||
94 | #define UART1_DATA UDR1 |
||
95 | #define UART1_UDRIE UDRIE1 |
||
96 | |||
97 | |||
98 | |||
99 | // |
||
100 | // module global variables |
||
101 | // |
||
102 | |||
103 | #if defined( ATMEGA_USART1 ) |
||
104 | static volatile unsigned char UART1_TxBuf[UART_TX_BUFFER_SIZE]; |
||
105 | static volatile unsigned char UART1_RxBuf[UART_RX_BUFFER_SIZE]; |
||
106 | static volatile unsigned char UART1_TxHead; |
||
107 | static volatile unsigned char UART1_TxTail; |
||
108 | static volatile unsigned char UART1_RxHead; |
||
109 | static volatile unsigned char UART1_RxTmpHead; |
||
110 | static volatile unsigned char UART1_RxTail; |
||
111 | static volatile unsigned char UART1_LastRxError; |
||
112 | |||
113 | static volatile unsigned char UART1_RxTmpHead;; |
||
114 | |||
115 | volatile uint16_t UART1_RxError; |
||
116 | |||
117 | #endif |
||
118 | |||
119 | volatile uint8_t UART1_receiveNMEA = false; |
||
120 | |||
121 | |||
122 | void SetBaudUart1(uint8_t Baudrate) |
||
123 | { |
||
124 | switch (Baudrate) |
||
125 | { |
||
126 | case Baud_2400: uart1_init( UART_BAUD_SELECT(2400,F_CPU) ); break; |
||
127 | case Baud_4800: uart1_init( UART_BAUD_SELECT(4800,F_CPU) ); break; |
||
128 | // case Baud_9600: uart1_init( UART_BAUD_SELECT(9600,F_CPU) ); break; |
||
129 | case Baud_9600: uart1_init( 129); break; |
||
130 | case Baud_19200: uart1_init( UART_BAUD_SELECT(19200,F_CPU) ); break; |
||
131 | case Baud_38400: uart1_init( UART_BAUD_SELECT(38400,F_CPU) ); break; |
||
132 | case Baud_57600: uart1_init( UART_BAUD_SELECT(57600,F_CPU) ); break; |
||
133 | // case Baud_57600: uart1_init( 21); break; |
||
134 | // case Baud_115200: uart1_init( UART_BAUD_SELECT(115200,F_CPU) ); break; |
||
135 | case Baud_115200: uart1_init( 10 ); break; |
||
136 | } |
||
137 | } |
||
138 | |||
139 | // |
||
140 | // these functions are only for ATmegas with two USART |
||
141 | // |
||
142 | |||
143 | |||
144 | #if defined( ATMEGA_USART1 ) |
||
145 | |||
146 | #if 0 |
||
147 | //-------------------------------------------------------------- |
||
148 | // Function: UART1 Receive Complete interrupt |
||
149 | // Purpose: called when the UART1 has received a character |
||
150 | //-------------------------------------------------------------- |
||
151 | ISR(USART1_RX_vect) |
||
152 | { |
||
153 | unsigned char tmphead; |
||
154 | unsigned char data; |
||
155 | unsigned char usr; |
||
156 | unsigned char lastRxError; |
||
157 | |||
158 | |||
159 | // read UART status register and UART data register |
||
160 | usr = UART1_STATUS; |
||
161 | data = UART1_DATA; |
||
162 | |||
163 | lastRxError = (usr & (_BV(FE1)|_BV(DOR1)) ); |
||
164 | |||
165 | // calculate buffer index |
||
166 | tmphead = ( UART1_RxHead + 1) & UART_RX_BUFFER_MASK; |
||
167 | |||
168 | if ( tmphead == UART1_RxTail ) |
||
169 | { |
||
170 | // error: receive buffer overflow |
||
171 | lastRxError = UART_BUFFER_OVERFLOW >> 8; |
||
172 | UART1_RxError++; |
||
173 | } |
||
174 | else |
||
175 | { |
||
176 | // store new index |
||
177 | UART1_RxHead = tmphead; |
||
178 | // store received data in buffer |
||
179 | UART1_RxBuf[tmphead] = data; |
||
180 | } |
||
181 | UART1_LastRxError = lastRxError; |
||
182 | } |
||
183 | #else |
||
184 | |||
185 | #warning Test neue UART ISR für NMEA |
||
186 | |||
187 | //-------------------------------------------------------------- |
||
188 | // Function: UART1 Receive Complete interrupt, decode NMEA GPGGA |
||
189 | // Purpose: called when the UART1 has received a character |
||
190 | //-------------------------------------------------------------- |
||
191 | ISR(USART1_RX_vect) |
||
192 | { |
||
193 | unsigned char tmphead; |
||
194 | unsigned char data; |
||
195 | unsigned char usr; |
||
196 | unsigned char lastRxError; |
||
197 | |||
198 | usr = UART1_STATUS; |
||
199 | data = UART1_DATA; |
||
200 | |||
201 | lastRxError = (usr & (_BV(FE1)|_BV(DOR1)) ); |
||
202 | |||
203 | // calculate buffer index |
||
204 | tmphead = ( UART1_RxHead + 1) & UART_RX_BUFFER_MASK; |
||
205 | |||
206 | if ( tmphead == UART1_RxTail ) |
||
207 | { |
||
208 | // error: receive buffer overflow |
||
209 | lastRxError = UART_BUFFER_OVERFLOW >> 8; |
||
210 | UART1_RxError++; |
||
211 | } |
||
212 | else |
||
213 | { |
||
214 | if (UART1_receiveNMEA) |
||
215 | { |
||
216 | fusedata(data); // NMEA Daten bearbeiten |
||
217 | } |
||
218 | |||
219 | else // if (UART1_receiveNMEA) |
||
220 | |||
221 | { |
||
222 | // store new index |
||
223 | UART1_RxHead = tmphead; |
||
224 | // store received data in buffer |
||
225 | UART1_RxBuf[tmphead] = data; |
||
226 | } |
||
227 | } |
||
228 | UART1_LastRxError = lastRxError; |
||
229 | } |
||
230 | |||
231 | ////-------------------------------------------------------------- |
||
232 | //// Function: UART1 Receive Complete interrupt, decode NMEA GPGGA |
||
233 | //// Purpose: called when the UART1 has received a character |
||
234 | ////-------------------------------------------------------------- |
||
235 | //ISR(USART1_RX_vect) |
||
236 | //{ |
||
237 | // unsigned char tmphead; |
||
238 | // unsigned char data; |
||
239 | // unsigned char usr; |
||
240 | // unsigned char lastRxError; |
||
241 | // |
||
242 | // static volatile uint8_t GGA; |
||
243 | // static char buffer[6]; |
||
244 | // static volatile uint8_t bufferindex; |
||
245 | // static volatile uint8_t NMEAstart,NMEAend = false; |
||
246 | // |
||
247 | // // read UART status register and UART data register |
||
248 | // usr = UART1_STATUS; |
||
249 | // data = UART1_DATA; |
||
250 | // |
||
251 | // lastRxError = (usr & (_BV(FE1)|_BV(DOR1)) ); |
||
252 | // |
||
253 | // // calculate buffer index |
||
254 | // |
||
255 | // tmphead = ( UART1_RxHead + 1) & UART_RX_BUFFER_MASK; |
||
256 | // |
||
257 | // if ( tmphead == UART1_RxTail ) |
||
258 | // { |
||
259 | // // error: receive buffer overflow |
||
260 | // lastRxError = UART_BUFFER_OVERFLOW >> 8; |
||
261 | // UART1_RxError++; |
||
262 | // } |
||
263 | // else |
||
264 | // { |
||
265 | // if (UART1_receiveNMEA) |
||
266 | // { |
||
267 | // cli(); |
||
268 | // switch(data) |
||
269 | // { |
||
270 | // case '$': //start of a packet |
||
271 | // |
||
272 | // if (!NMEAstart && GGA) // falls mitten im Datensatz eine neuer kommt, warum auch immer |
||
273 | // { |
||
274 | // // restore index, war kein GPGGA Datensatz |
||
275 | // UART1_RxHead = UART1_RxTmpHead; |
||
276 | // memset(buffer,0,6); |
||
277 | // bufferindex=0; //wipe all these so they can be reused |
||
278 | // } |
||
279 | // NMEAstart = true; |
||
280 | // NMEAend = false; |
||
281 | // GGA=false; |
||
282 | // bufferindex=0; //wipe all these so they can be reused |
||
283 | // |
||
284 | // UART1_RxTmpHead = tmphead-1; // erstmal sichern, Start des NMEA Datensatzes |
||
285 | // // store new index, erstam in den Buffer schreiben |
||
286 | // UART1_RxHead = tmphead; |
||
287 | // // store received data in buffer |
||
288 | // UART1_RxBuf[tmphead] = data; |
||
289 | //// USART_putc(data); |
||
290 | // sei(); |
||
291 | // break; |
||
292 | // |
||
293 | // default: //we have some of the CSV data |
||
294 | // if(bufferindex<6) //dont mess up ! Dont overflow |
||
295 | // { |
||
296 | // buffer[bufferindex]=data; //stick the character in our buffer |
||
297 | // } |
||
298 | // |
||
299 | // if(GGA) |
||
300 | // { |
||
301 | // // store new index, erstam in den Buffer schreiben |
||
302 | // UART1_RxHead = tmphead; |
||
303 | // // store received data in buffer |
||
304 | // UART1_RxBuf[tmphead] = data; |
||
305 | //// USART_putc(data); |
||
306 | // |
||
307 | // |
||
308 | // switch ( data) |
||
309 | // { |
||
310 | // case '\r' : |
||
311 | // GGA = false; |
||
312 | // bufferindex=0; //wipe all these so they can be reused |
||
313 | // NMEAstart = false; |
||
314 | // NMEAend = true; |
||
315 | // UART1_GPGGA++; |
||
316 | // memset(buffer,0,6); |
||
317 | // break; // Ende mit NMEA Datensatz |
||
318 | // |
||
319 | // case '\n' : |
||
320 | // GGA = false; |
||
321 | // bufferindex=0; //wipe all these so they can be reused |
||
322 | // NMEAstart = false; |
||
323 | // NMEAend = true; |
||
324 | // UART1_GPGGA++; |
||
325 | // memset(buffer,0,6); |
||
326 | // break; // Ende mit NMEA Datensatz |
||
327 | // } |
||
328 | // |
||
329 | // } |
||
330 | // |
||
331 | // else if(NMEAstart) //the header, erstes Komma noch nicht gekommen |
||
332 | // |
||
333 | // { |
||
334 | // if(bufferindex<4) |
||
335 | // |
||
336 | // { |
||
337 | // bufferindex++; //increase the position in the buffer |
||
338 | // |
||
339 | // // store new index, erstmal in den Buffer schreiben |
||
340 | // UART1_RxHead = tmphead; |
||
341 | // // store received data in buffer |
||
342 | // UART1_RxBuf[tmphead] = data; |
||
343 | //// USART_putc(data); |
||
344 | // |
||
345 | // |
||
346 | // } |
||
347 | // else |
||
348 | // |
||
349 | // { |
||
350 | //// cli(); |
||
351 | // if(!strcmp(buffer,"GPGGA")) //the last character will be a 0(end of string) |
||
352 | // |
||
353 | // { |
||
354 | // GGA=true; |
||
355 | // NMEAstart = false; |
||
356 | // // store new index, erstmal in den Buffer schreiben |
||
357 | // UART1_RxHead = tmphead; |
||
358 | // // store received data in buffer |
||
359 | // UART1_RxBuf[tmphead] = data; |
||
360 | //// USART_putc(data); |
||
361 | //// sei(); |
||
362 | // } |
||
363 | // |
||
364 | // else |
||
365 | // |
||
366 | // { |
||
367 | // // restore index, war kein GPGGA Datensatz |
||
368 | // |
||
369 | // UART1_RxHead = UART1_RxTmpHead; |
||
370 | //// commacount=0; |
||
371 | // memset(buffer,0,6); |
||
372 | // bufferindex=0; //wipe all these so they can be reused |
||
373 | // NMEAstart = false; |
||
374 | //// sei(); |
||
375 | // } |
||
376 | // } |
||
377 | // } |
||
378 | // else if (!NMEAend && !GGA) UART1_RxHead = UART1_RxTmpHead; // Zeichen verwerfen |
||
379 | // |
||
380 | // } // end switch (data) |
||
381 | // } |
||
382 | // |
||
383 | // else // if (UART1_receiveNMEA) |
||
384 | // |
||
385 | // { |
||
386 | // // store new index |
||
387 | // UART1_RxHead = tmphead; |
||
388 | // // store received data in buffer |
||
389 | // UART1_RxBuf[tmphead] = data; |
||
390 | // } |
||
391 | // } |
||
392 | // UART1_LastRxError = lastRxError; |
||
393 | //} |
||
394 | #endif |
||
395 | |||
396 | //-------------------------------------------------------------- |
||
397 | // Function: UART1 Data Register Empty interrupt |
||
398 | // Purpose: called when the UART1 is ready to transmit the next byte |
||
399 | //-------------------------------------------------------------- |
||
400 | ISR(USART1_UDRE_vect) |
||
401 | { |
||
402 | unsigned char tmptail; |
||
403 | |||
404 | |||
405 | if ( UART1_TxHead != UART1_TxTail) |
||
406 | { |
||
407 | // calculate and store new buffer index |
||
408 | tmptail = (UART1_TxTail + 1) & UART_TX_BUFFER_MASK; |
||
409 | UART1_TxTail = tmptail; |
||
410 | // get one byte from buffer and write it to UART |
||
411 | UART1_DATA = UART1_TxBuf[tmptail]; // start transmission |
||
412 | } |
||
413 | else |
||
414 | { |
||
415 | // tx buffer empty, disable UDRE interrupt |
||
416 | UART1_CONTROL &= ~_BV(UART1_UDRIE); |
||
417 | } |
||
418 | } |
||
419 | |||
420 | |||
421 | //-------------------------------------------------------------- |
||
422 | // Function: uart1_init() |
||
423 | // Purpose: initialize UART1 and set baudrate |
||
424 | // Input: baudrate using macro UART_BAUD_SELECT() |
||
425 | // Returns: none |
||
426 | //-------------------------------------------------------------- |
||
427 | void uart1_init(unsigned int baudrate) |
||
428 | { |
||
429 | UART1_TxHead = 0; |
||
430 | UART1_TxTail = 0; |
||
431 | UART1_RxHead = 0; |
||
432 | UART1_RxTail = 0; |
||
433 | UART1_RxError = 0; |
||
434 | UART1_receiveNMEA = false; //Empfang von NMEA Daten aus |
||
435 | |||
436 | |||
437 | // Set baud rate |
||
438 | if ( baudrate & 0x8000 ) |
||
439 | { |
||
440 | UART1_STATUS = (1<<U2X1); //Enable 2x speed |
||
441 | baudrate &= ~0x8000; |
||
442 | } |
||
443 | UBRR1H = (unsigned char)(baudrate>>8); |
||
444 | UBRR1L = (unsigned char) baudrate; |
||
445 | |||
446 | // Enable USART receiver and transmitter and receive complete interrupt |
||
447 | UART1_CONTROL = _BV(RXCIE1)|(1<<RXEN1)|(1<<TXEN1); |
||
448 | |||
449 | // Set frame format: asynchronous, 8data, no parity, 1stop bit |
||
450 | #ifdef URSEL1 |
||
451 | UCSR1C = (1<<URSEL1)|(3<<UCSZ10); |
||
452 | #else |
||
453 | UCSR1C = (3<<UCSZ10); |
||
454 | // UCSR1C = (1<<UCSZ11) | (1<<UCSZ10); // 8data Bit |
||
455 | #endif |
||
456 | |||
457 | |||
458 | |||
459 | } |
||
460 | |||
461 | |||
462 | //-------------------------------------------------------------- |
||
463 | // Function: uart1_getc() |
||
464 | // Purpose: return byte from ringbuffer |
||
465 | // Returns: lower byte: received byte from ringbuffer |
||
466 | // higher byte: last receive error |
||
467 | //-------------------------------------------------------------- |
||
468 | unsigned int uart1_getc(void) |
||
469 | { |
||
470 | unsigned char tmptail; |
||
471 | unsigned char data; |
||
472 | |||
473 | |||
474 | if ( UART1_RxHead == UART1_RxTail ) |
||
475 | { |
||
476 | return UART_NO_DATA; // no data available |
||
477 | } |
||
478 | |||
479 | // calculate /store buffer index |
||
480 | tmptail = (UART1_RxTail + 1) & UART_RX_BUFFER_MASK; |
||
481 | UART1_RxTail = tmptail; |
||
482 | |||
483 | // get data from receive buffer |
||
484 | data = UART1_RxBuf[tmptail]; |
||
485 | |||
486 | return (UART1_LastRxError << 8) + data; |
||
487 | |||
488 | }/* uart1_getc */ |
||
489 | |||
490 | |||
491 | //-------------------------------------------------------------- |
||
492 | // Function: uart1_peek() |
||
493 | // Purpose: Returns the next byte (character) of incoming serial data without removing it from the internal serial buffer |
||
494 | // Returns: lower byte: received byte from ringbuffer |
||
495 | // higher byte: last receive error |
||
496 | //-------------------------------------------------------------- |
||
497 | int uart1_peek(void) |
||
498 | { |
||
499 | unsigned char tmptail; |
||
500 | unsigned char data; |
||
501 | |||
502 | |||
503 | if ( UART1_RxHead == UART1_RxTail ) |
||
504 | { |
||
505 | return -1; // no data available |
||
506 | } |
||
507 | |||
508 | // calculate /store buffer index |
||
509 | tmptail = (UART1_RxTail + 1) & UART_RX_BUFFER_MASK; |
||
510 | |||
511 | // get data from receive buffer |
||
512 | data = UART1_RxBuf[tmptail]; |
||
513 | |||
514 | return (UART1_LastRxError << 8) + data; |
||
515 | |||
516 | }/* uart1_getc */ |
||
517 | |||
518 | |||
519 | //int HardwareSerial::peek(void) |
||
520 | //{ |
||
521 | // if (_rx_buffer->head == _rx_buffer->tail) { |
||
522 | // return -1; |
||
523 | // } else { |
||
524 | // return _rx_buffer->buffer[_rx_buffer->tail]; |
||
525 | // } |
||
526 | //} |
||
527 | |||
528 | |||
529 | //-------------------------------------------------------------- |
||
530 | // Function: uart1_putc() |
||
531 | // Purpose: write byte to ringbuffer for transmitting via UART |
||
532 | // Input: byte to be transmitted |
||
533 | // Returns: 1 on succes, 0 if remote not ready |
||
534 | //-------------------------------------------------------------- |
||
535 | int uart1_putc(unsigned char data) |
||
536 | { |
||
537 | unsigned char tmphead; |
||
538 | |||
539 | |||
540 | tmphead = (UART1_TxHead + 1) & UART_TX_BUFFER_MASK; |
||
541 | |||
542 | while ( tmphead == UART1_TxTail ) |
||
543 | {;} // wait for free space in buffer |
||
544 | |||
545 | UART1_TxBuf[tmphead] = data; |
||
546 | UART1_TxHead = tmphead; |
||
547 | |||
548 | // enable UDRE interrupt |
||
549 | UART1_CONTROL |= _BV(UART1_UDRIE); |
||
550 | return (UART1_LastRxError << 8) + data; |
||
551 | } |
||
552 | |||
553 | |||
554 | //-------------------------------------------------------------- |
||
555 | // Function: uart1_puts() |
||
556 | // Purpose: transmit string to UART1 |
||
557 | // Input: string to be transmitted |
||
558 | // Returns: none |
||
559 | //-------------------------------------------------------------- |
||
560 | void uart1_puts(const char *s ) |
||
561 | { |
||
562 | while (*s) |
||
563 | uart1_putc(*s++); |
||
564 | } |
||
565 | |||
566 | |||
567 | //-------------------------------------------------------------- |
||
568 | // Function: uart1_puts_p() |
||
569 | // Purpose: transmit string from program memory to UART1 |
||
570 | // Input: program memory string to be transmitted |
||
571 | // Returns: none |
||
572 | //-------------------------------------------------------------- |
||
573 | void uart1_puts_p(const char *progmem_s ) |
||
574 | { |
||
575 | register char c; |
||
576 | while ( (c = pgm_read_byte(progmem_s++)) ) |
||
577 | uart1_putc(c); |
||
578 | } |
||
579 | |||
580 | |||
581 | //-------------------------------------------------------------- |
||
582 | // Function: uart1_available() |
||
583 | // Purpose: Determine the number of bytes waiting in the receive buffer |
||
584 | // Input: None |
||
585 | // Returns: Integer number of bytes in the receive buffer |
||
586 | //-------------------------------------------------------------- |
||
587 | uint16_t uart1_available(void) |
||
588 | { |
||
589 | return (UART_RX_BUFFER_MASK + UART1_RxHead - UART1_RxTail) % UART_RX_BUFFER_MASK; |
||
590 | } |
||
591 | |||
592 | |||
593 | |||
594 | //-------------------------------------------------------------- |
||
595 | // Function: uart1_flush() |
||
596 | // Purpose: Flush bytes waiting the receive buffer. Acutally ignores them. |
||
597 | // Input: None |
||
598 | // Returns: None |
||
599 | //-------------------------------------------------------------- |
||
600 | void uart1_flush(void) |
||
601 | { |
||
602 | UART1_RxHead = UART1_RxTail; |
||
603 | } |
||
604 | |||
605 | |||
606 | /************************************************************************* |
||
607 | Function: utoa() |
||
608 | Purpose: convert unsigned integer to ascii |
||
609 | Input: string_buffer, string_buffer_size, unsigned integer value |
||
610 | Returns: first ascii character |
||
611 | **************************************************************************/ |
||
612 | char *utoa1(char* buffer, const unsigned int size, unsigned int value) |
||
613 | { |
||
614 | char *p; |
||
615 | |||
616 | // p points to last char |
||
617 | p = buffer+size-1; |
||
618 | |||
619 | // Set terminating Zero |
||
620 | *p='\0'; |
||
621 | |||
622 | do |
||
623 | { |
||
624 | *--p = value%10 + '0'; |
||
625 | value = value/10; |
||
626 | } while (value!=0 && p>buffer); |
||
627 | |||
628 | return p; |
||
629 | }/* utoa */ |
||
630 | |||
631 | |||
632 | |||
633 | |||
634 | |||
635 | |||
636 | #endif |
||
637 | //#endif |
||
638 |