MarlinSerial.cpp 7.2 KB

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  1. /*
  2. HardwareSerial.cpp - Hardware serial library for Wiring
  3. Copyright (c) 2006 Nicholas Zambetti. All right reserved.
  4. This library is free software; you can redistribute it and/or
  5. modify it under the terms of the GNU Lesser General Public
  6. License as published by the Free Software Foundation; either
  7. version 2.1 of the License, or (at your option) any later version.
  8. This library is distributed in the hope that it will be useful,
  9. but WITHOUT ANY WARRANTY; without even the implied warranty of
  10. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11. Lesser General Public License for more details.
  12. You should have received a copy of the GNU Lesser General Public
  13. License along with this library; if not, write to the Free Software
  14. Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  15. Modified 23 November 2006 by David A. Mellis
  16. Modified 28 September 2010 by Mark Sproul
  17. */
  18. #include "Marlin.h"
  19. #include "MarlinSerial.h"
  20. #if MOTHERBOARD != 8 // !teensylu
  21. // this next line disables the entire HardwareSerial.cpp,
  22. // this is so I can support Attiny series and any other chip without a uart
  23. #if defined(UBRRH) || defined(UBRR0H) || defined(UBRR1H) || defined(UBRR2H) || defined(UBRR3H)
  24. #if defined(UBRRH) || defined(UBRR0H)
  25. ring_buffer rx_buffer = { { 0 }, 0, 0 };
  26. #endif
  27. FORCE_INLINE void store_char(unsigned char c)
  28. {
  29. int i = (unsigned int)(rx_buffer.head + 1) % RX_BUFFER_SIZE;
  30. // if we should be storing the received character into the location
  31. // just before the tail (meaning that the head would advance to the
  32. // current location of the tail), we're about to overflow the buffer
  33. // and so we don't write the character or advance the head.
  34. if (i != rx_buffer.tail) {
  35. rx_buffer.buffer[rx_buffer.head] = c;
  36. rx_buffer.head = i;
  37. }
  38. }
  39. //#elif defined(SIG_USART_RECV)
  40. #if defined(USART0_RX_vect)
  41. // fixed by Mark Sproul this is on the 644/644p
  42. //SIGNAL(SIG_USART_RECV)
  43. SIGNAL(USART0_RX_vect)
  44. {
  45. #if defined(UDR0)
  46. unsigned char c = UDR0;
  47. #elif defined(UDR)
  48. unsigned char c = UDR; // atmega8, atmega32
  49. #else
  50. #error UDR not defined
  51. #endif
  52. store_char(c);
  53. }
  54. #endif
  55. // Constructors ////////////////////////////////////////////////////////////////
  56. MarlinSerial::MarlinSerial()
  57. {
  58. }
  59. // Public Methods //////////////////////////////////////////////////////////////
  60. void MarlinSerial::begin(long baud)
  61. {
  62. uint16_t baud_setting;
  63. bool useU2X0 = true;
  64. #if F_CPU == 16000000UL
  65. // hardcoded exception for compatibility with the bootloader shipped
  66. // with the Duemilanove and previous boards and the firmware on the 8U2
  67. // on the Uno and Mega 2560.
  68. if (baud == 57600) {
  69. useU2X0 = false;
  70. }
  71. #endif
  72. if (useU2X0) {
  73. UCSR0A = 1 << U2X0;
  74. baud_setting = (F_CPU / 4 / baud - 1) / 2;
  75. } else {
  76. UCSR0A = 0;
  77. baud_setting = (F_CPU / 8 / baud - 1) / 2;
  78. }
  79. // assign the baud_setting, a.k.a. ubbr (USART Baud Rate Register)
  80. UBRR0H = baud_setting >> 8;
  81. UBRR0L = baud_setting;
  82. sbi(UCSR0B, RXEN0);
  83. sbi(UCSR0B, TXEN0);
  84. sbi(UCSR0B, RXCIE0);
  85. }
  86. void MarlinSerial::end()
  87. {
  88. cbi(UCSR0B, RXEN0);
  89. cbi(UCSR0B, TXEN0);
  90. cbi(UCSR0B, RXCIE0);
  91. }
  92. int MarlinSerial::peek(void)
  93. {
  94. if (rx_buffer.head == rx_buffer.tail) {
  95. return -1;
  96. } else {
  97. return rx_buffer.buffer[rx_buffer.tail];
  98. }
  99. }
  100. int MarlinSerial::read(void)
  101. {
  102. // if the head isn't ahead of the tail, we don't have any characters
  103. if (rx_buffer.head == rx_buffer.tail) {
  104. return -1;
  105. } else {
  106. unsigned char c = rx_buffer.buffer[rx_buffer.tail];
  107. rx_buffer.tail = (unsigned int)(rx_buffer.tail + 1) % RX_BUFFER_SIZE;
  108. return c;
  109. }
  110. }
  111. void MarlinSerial::flush()
  112. {
  113. // don't reverse this or there may be problems if the RX interrupt
  114. // occurs after reading the value of rx_buffer_head but before writing
  115. // the value to rx_buffer_tail; the previous value of rx_buffer_head
  116. // may be written to rx_buffer_tail, making it appear as if the buffer
  117. // don't reverse this or there may be problems if the RX interrupt
  118. // occurs after reading the value of rx_buffer_head but before writing
  119. // the value to rx_buffer_tail; the previous value of rx_buffer_head
  120. // may be written to rx_buffer_tail, making it appear as if the buffer
  121. // were full, not empty.
  122. rx_buffer.head = rx_buffer.tail;
  123. }
  124. /// imports from print.h
  125. void MarlinSerial::print(char c, int base)
  126. {
  127. print((long) c, base);
  128. }
  129. void MarlinSerial::print(unsigned char b, int base)
  130. {
  131. print((unsigned long) b, base);
  132. }
  133. void MarlinSerial::print(int n, int base)
  134. {
  135. print((long) n, base);
  136. }
  137. void MarlinSerial::print(unsigned int n, int base)
  138. {
  139. print((unsigned long) n, base);
  140. }
  141. void MarlinSerial::print(long n, int base)
  142. {
  143. if (base == 0) {
  144. write(n);
  145. } else if (base == 10) {
  146. if (n < 0) {
  147. print('-');
  148. n = -n;
  149. }
  150. printNumber(n, 10);
  151. } else {
  152. printNumber(n, base);
  153. }
  154. }
  155. void MarlinSerial::print(unsigned long n, int base)
  156. {
  157. if (base == 0) write(n);
  158. else printNumber(n, base);
  159. }
  160. void MarlinSerial::print(double n, int digits)
  161. {
  162. printFloat(n, digits);
  163. }
  164. void MarlinSerial::println(void)
  165. {
  166. print('\r');
  167. print('\n');
  168. }
  169. void MarlinSerial::println(const String &s)
  170. {
  171. print(s);
  172. println();
  173. }
  174. void MarlinSerial::println(const char c[])
  175. {
  176. print(c);
  177. println();
  178. }
  179. void MarlinSerial::println(char c, int base)
  180. {
  181. print(c, base);
  182. println();
  183. }
  184. void MarlinSerial::println(unsigned char b, int base)
  185. {
  186. print(b, base);
  187. println();
  188. }
  189. void MarlinSerial::println(int n, int base)
  190. {
  191. print(n, base);
  192. println();
  193. }
  194. void MarlinSerial::println(unsigned int n, int base)
  195. {
  196. print(n, base);
  197. println();
  198. }
  199. void MarlinSerial::println(long n, int base)
  200. {
  201. print(n, base);
  202. println();
  203. }
  204. void MarlinSerial::println(unsigned long n, int base)
  205. {
  206. print(n, base);
  207. println();
  208. }
  209. void MarlinSerial::println(double n, int digits)
  210. {
  211. print(n, digits);
  212. println();
  213. }
  214. // Private Methods /////////////////////////////////////////////////////////////
  215. void MarlinSerial::printNumber(unsigned long n, uint8_t base)
  216. {
  217. unsigned char buf[8 * sizeof(long)]; // Assumes 8-bit chars.
  218. unsigned long i = 0;
  219. if (n == 0) {
  220. print('0');
  221. return;
  222. }
  223. while (n > 0) {
  224. buf[i++] = n % base;
  225. n /= base;
  226. }
  227. for (; i > 0; i--)
  228. print((char) (buf[i - 1] < 10 ?
  229. '0' + buf[i - 1] :
  230. 'A' + buf[i - 1] - 10));
  231. }
  232. void MarlinSerial::printFloat(double number, uint8_t digits)
  233. {
  234. // Handle negative numbers
  235. if (number < 0.0)
  236. {
  237. print('-');
  238. number = -number;
  239. }
  240. // Round correctly so that print(1.999, 2) prints as "2.00"
  241. double rounding = 0.5;
  242. for (uint8_t i=0; i<digits; ++i)
  243. rounding /= 10.0;
  244. number += rounding;
  245. // Extract the integer part of the number and print it
  246. unsigned long int_part = (unsigned long)number;
  247. double remainder = number - (double)int_part;
  248. print(int_part);
  249. // Print the decimal point, but only if there are digits beyond
  250. if (digits > 0)
  251. print(".");
  252. // Extract digits from the remainder one at a time
  253. while (digits-- > 0)
  254. {
  255. remainder *= 10.0;
  256. int toPrint = int(remainder);
  257. print(toPrint);
  258. remainder -= toPrint;
  259. }
  260. }
  261. // Preinstantiate Objects //////////////////////////////////////////////////////
  262. MarlinSerial MSerial;
  263. #endif // whole file
  264. #endif //teensylu