Linux串口傳輸文件

需要從FPGAm上傳輸文件到PC機上，下面是串口傳輸文件的小程序，可以測試下串口buffer的大小，我電腦上大概4K多，也可以測試串口寄存器大小讀入讀出大小，我這裡是32bytes。

write.c

1. #include <stdlib.h>
2. #include <stdio.h>
3. #include <unistd.h>
4. #include <string.h>
5. #include <sys/types.h>
6. #include <sys/stat.h>
7. #include <fcntl.h>
8. #include <termios.h>
9. #include <errno.h>
10. #include <sys/time.h>
11. #include <time.h>
13. #define BUFFER_SIZE 16
14. #define FALSE -1
15. #define TRUE 1
17. int speed_arr[] = { B38400, B19200, B9600, B4800, B2400, B1200, B300,
18. B38400, B19200, B9600, B4800, B2400, B1200, B300, };
19. int name_arr[] = {38400, 19200, 9600, 4800, 2400, 1200, 300,
20. 38400, 19200, 9600, 4800, 2400, 1200, 300, };
22. void set_speed(int fd, int speed);
23. int set_Parity(int fd,int databits,int stopbits,int parity);
25. int main(int argc,char *argv[])
26. {
27. char *interface = NULL,*filename = NULL;
29. if (argc < 2)
30. {
31. interface = "/dev/ttyUSB0";
32. filename = "hello.txt" ;
33. }
34. else
35. {
36. interface = argv[1];
37. filename = argv[2];
38. }
40. int fd=open(interface,O_RDWR|O_NOCTTY|O_NDELAY);
41. if(fd == -1)
42. {
43. printf("%s Open Error!\n",interface);
44. return -1;
45. }
46. printf("open %s successfully !",interface);
48. set_speed(fd,19200);
49. if (set_Parity(fd,8,1,'N')== FALSE)
50. {
51. printf("Set Parity Error\n");
52. exit(1);
53. }
56. int fp = open(filename,O_RDWR);
57. if ( fp == -1 )
58. {
59. printf("open %s failured\n",filename);
60. return -1;
61. }
62. int nread = 1;
63. char buffer[BUFFER_SIZE] = {'\0'};
64. int sum = 0;
66. while(nread > 0)
67. {
68. int nwrite = 0;
69. int tmp = 0,pos=0;
70. nread = read(fp,buffer,BUFFER_SIZE); //一次要寫進去的字節數
71. printf("讀取字節數 : %d bytes \n",nread);
72. int size_write = nread; //size_write是要本次要寫入的總字節數
73. while (size_write > 0)
74. {
75. // int pos = 0>=nwrite?0:nwrite ; //偏移
76. // printf("pos = %d\n",pos);
77. tmp = (nwrite > tmp)? nwrite : tmp; //
78. pos = tmp ;
79. //printf("tmp = %d,pos %d \n",tmp,pos);
80. nwrite = write(fd,buffer + pos,size_write); //nwrite一次寫進去的字節數
81. if (nwrite == -1)
82. {
83. sleep (2);
84. continue;
85. }
86. sum = sum + nwrite; //nwrite 8
87. printf("寫入字節數 : %d,剩余字節數 : %d \n",sum,size_write);
88. size_write = size_write-nwrite; //剩下要寫進去的字節數
89. }
90. }
91. printf("sussfully write %s\n",filename);
92. close(fp);
93. close(fd);
94. return 0;
95. }
97. void set_speed(int fd, int speed)
98. {
99. int i;
100. int status;
101. struct termios Opt;
102. tcgetattr(fd, &Opt);
103. for ( i= 0; i < sizeof(speed_arr) / sizeof(int); i++)
104. {
105. if (speed == name_arr[i])
106. {
107. tcflush(fd, TCIOFLUSH);
108. cfsetispeed(&Opt, speed_arr[i]);
109. cfsetospeed(&Opt, speed_arr[i]);
110. status = tcsetattr(fd, TCSANOW, &Opt);
111. if (status != 0)
112. {
113. perror("tcsetattr fd1");
114. return;
115. }
116. }
117. tcflush(fd,TCIOFLUSH);
118. }
119. }
121. int set_Parity(int fd,int databits,int stopbits,int parity)
122. {
123. struct termios options;
124. if (tcgetattr( fd,&options) != 0)
125. {
126. perror("SetupSerial 1");
127. return(FALSE);
128. }
129. options.c_cflag &= ~CSIZE;
130. switch (databits) /*設置數據位數*/
131. {
132. case 7:
133. options.c_cflag |= CS7;
134. break;
135. case 8:
136. options.c_cflag |= CS8;
137. break;
138. default:
139. fprintf(stderr,"Unsupported data size\n");
140. return (FALSE);
141. }
142. switch (parity)
143. {
144. case 'n':
145. case 'N':
146. options.c_cflag &= ~PARENB; /* Clear parity enable */
147. options.c_iflag &= ~INPCK; /* Enable parity checking */
148. break;
149. case 'o':
150. case 'O':
151. options.c_cflag |= (PARODD | PARENB); /* 設置為奇效驗*/
152. options.c_iflag |= INPCK; /* Disnable parity checking */
153. break;
154. case 'e':
155. case 'E':
156. options.c_cflag |= PARENB; /* Enable parity */
157. options.c_cflag &= ~PARODD; /* 轉換為偶效驗*/
158. options.c_iflag |= INPCK; /* Disnable parity checking */
159. break;
160. case 'S':
161. case 's': /*as no parity*/
162. options.c_cflag &= ~PARENB;
163. options.c_cflag &= ~CSTOPB;
164. break;
165. default:
166. fprintf(stderr,"Unsupported parity\n");
167. return (FALSE);
168. }
169. /* 設置停止位*/
170. switch (stopbits)
171. {
172. case 1:
173. options.c_cflag &= ~CSTOPB;
174. break;
175. case 2:
176. options.c_cflag |= CSTOPB;
177. break;
178. default:
179. fprintf(stderr,"Unsupported stop bits\n");
180. return (FALSE);
181. }
182. /* Set input parity option */
183. if (parity != 'n')
184. options.c_iflag |= INPCK;
185. options.c_cc[VTIME] = 150; // 15 seconds
186. options.c_cc[VMIN] = 0;
188. tcflush(fd,TCIFLUSH); /* Update the options and do it NOW */
189. if (tcsetattr(fd,TCSANOW,&options) != 0)
190. {
191. perror("SetupSerial 3");
192. return (FALSE);
193. }
194. return (TRUE);
195. }