c语言uart串口通信编程s3c2410为例

 嵌入式linux系统串口通信示例代码

1. /*
2. author:sun
3. date: summer 2012
4. */
6. #include <stdio.h>
7. #include <stdlib.h>
8. #include <unistd.h>
10. #include <fcntl.h>
11. #include <termios.h>
13. //#include "gpio.h"
15. //#define LED1 0x31
16. //#define LED2 0x32
17. //#define LED3 0x33
18. //#define LEDOFF 0x34
19. //#define LEDON 0x35
21. struct termios options, oldoptions;
23. int uart_init(void)
24. {
25. int fd;
27. fd = open("/dev/s3c2410_serial0", O_RDWR);
28. tcgetattr(fd, &oldoptions);
29. tcgetattr(fd, &options);
31. cfsetispeed(&options, B115200);
32. cfsetospeed(&options, B115200);
34. options.c_cflag &= ~PARENB;
35. options.c_cflag &= ~CSIZE;
36. options.c_cflag |= CS8;
38. options.c_lflag &= (~ICANON);
40. tcsetattr(fd,TCSANOW,&options);
43. return fd;
45. }
47. int main(int argc, char *argv[])
48. {
49. int fd;
50. char buf;
51. fd=uart_init();
52. while(read(fd,&buf,2)>0);
53. printf("%s",buf);
54. tcsetattr(fd,TCSANOW,&oldoptions);
55. return 0;
56. }

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1. /*
2. author:sun
3. date: summer 2012
4. */
5. #include <stdio.h>
6. #include <stdlib.h>
7. #include <unistd.h>
8. #include <fcntl.h>
9. #include <termios.h>
10. #include "s5pv210-gpio.h"
12. struct termios options, oldoptions;
14. int uart_init(void)
15. {
16. int fd;
17. char test[50];
18. fd = open("/dev/s3c2410_serial0", O_RDWR);
19. tcgetattr(fd, &oldoptions);
20. tcgetattr(fd, &options);
22. cfsetispeed(&options, B115200);
23. cfsetospeed(&options, B115200);
25. options.c_cflag &= ~PARENB;
26. options.c_cflag |= CSTOPB;
27. options.c_cflag &= ~CSIZE;
28. options.c_cflag |= CS8;
30. options.c_lflag &= (~ICANON);
32. tcsetattr(fd,TCSANOW,&options);
34. return fd;
35. }
36. int ledd()
37. {
38. int fb;
39. fb= open("/dev/gpH0",O_WRONLY);
40. if(fb<0)
41. {
42. perror("open error");
43. }
44. ioctl(fb,GPIO_SET_PIN_OUT,0x1);
45. ioctl(fb,GPIO_SET_PIN_OUT,0x2);
46. ioctl(fb,GPIO_SET_PIN_OUT,0x3);
48. }
49. int main(int argc, char *argv[])
50. {
51. int fa;
52. char buf;
53. int led;
54. fa=uart_init();
55. led=ledd();
56. char led=0x01;
57. char down=0x00;
58. while(read(fa,&buf,1)>0);
59. { printf("%d",buf);
61. switch(buf)
63. case 1:
64. {
65. led=0x02;
66. write(fb,&led,sizeof(led));
67. sleep(1);
68. write(fb,&down,sizeof(led));
69. }
71. case 2:
72. {
73. led=0x04;
74. write(fb,&led,sizeof(led));
75. sleep(1);
76. write(fb,&down,sizeof(led));
77. }
78. case 3:
79. {
80. led=0x08;
81. write(fb,&led,sizeof(led));
82. sleep(1);
83. write(fb,&down,sizeof(led));
84. }
85. case 4:
86. {
87. led=0x02;
88. while(1)
89. {
90. sleep(1);
91. write(fb,&led,sizeof(led));
92. led=led<<1;
93. if(led==0x2<<3)
94. {
95. led=0x02;
96. }
97. }
98. }
99. }
101. tcsetattr(fa,TCSANOW,&oldoptions);
102. return 0;
103. }

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1. /*
2. author:sun
3. date: summer 2012
4. */
5. #include <stdio.h>
6. #include <stdlib.h>
7. #include <unistd.h>
9. #include <fcntl.h>
10. #include <termios.h>
12. #include "gpio.h"
14. #define LED1 0x31
15. #define LED2 0x32
16. #define LED3 0x33
17. #define LEDOFF 0x34
18. #define LEDON 0x35
20. struct termios options, oldoptions;
22. int uart_init(void)
23. {
24. int fd;
25. fd = open("/dev/s3c2410_serial0", O_RDWR);
26. tcgetattr(fd, &oldoptions);
27. tcgetattr(fd, &options);
29. cfsetispeed(&options, B115200);
30. cfsetospeed(&options, B115200);
32. options.c_cflag &= ~PARENB; //无奇偶校验位
33. options.c_cflag |= CSTOPB; //停止位为1位
34. options.c_cflag &= ~CSIZE;
35. options.c_cflag |= CS8; //数据位为8位
37. options.c_lflag &= (~ICANON); //非标准模式(RAW模式), 无缓冲区,当接收时,输入的字符在它们被收到后立即被传送
38. //options.c_lflag &= (~ECHO); //关回显
39. //此处回显关不关是不影响本实验的,在手机实验的时候会有影响，因为手机
40. //用的串口1的终端是没有打开的,若是不关的话，会把所以的输入全部读到，所以
41. //要将回显关掉
42. tcsetattr(fd,TCSANOW,&options);
43. return fd;
44. }
46. int main(int argc, char *argv[])
47. {
49. tcsetattr(fd,TCSANOW,&oldoptions);
50. return 0;
51. }

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1. #ifndef __USR_GPIO_H__
2. #define __USR_GPIO_H__
4. #define GPIO_SET_PIN 0
5. //#define GPIO_SET_MULTI_PIN 1
7. #define GPIO_SET_ALL_PIN 2
9. #define GPIO_CLR_PIN 3
10. //#define GPIO_CLR_MULTI_PIN 4 //等同GPIO_CLR_PIN
12. #define GPIO_CLR_ALL_PIN 5
14. /******************************
15. * the configration of gpio mode
16. ******************************/
17. #define GPIO_CFG_PIN_OUT 6
18. //#define GPIO_CFG_MULTI_PIN_OUT 10 //等同GPIO_CFG_PIN_OUT
20. #define GPIO_CFG_PIN_IN 7
21. //#define GPIO_CFG_MULTI_PIN_IN 11 //等同GPIO_CFG_PIN_IN
23. #define GPIO_CFG_PIN_UP_ON 8
24. //#define GPIO_CFG_MULTI_PIN_UP_ON 12 //等同GPIO_CFG_PIN_UP_ON
26. #define GPIO_CFG_PIN_UP_OFF 9
27. //#define GPIO_CFG_MULTI_PIN_UP_OFF 13 //等同GPIO_CFG_PIN_UP_OFF
30. #define GPIO_PIN_AREA(startbit,endbit) ((startbit)|((endbit)<<4))
31. #define GPIO_PIN_BIT(bit) GPIO_PIN_AREA(bit,bit)
33. #endif

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