友善之臂 mini2440 SPI 驱动移植.docx
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友善之臂 mini2440 SPI 驱动移植.docx
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友善之臂mini2440SPI驱动移植
Linux2.6.32下SPI驱动的移植如下图所示:
下面需要修改部分内核代码,具体操作如下:
1. 修改arch/arm/mach-s3c2440/mach-mini2440.c文件
在include头文件代码行之后增加如下代码
//spi add by shiguang
#include
#include
static struct spi_board_info s3c2410_spi0_board[] = {
[0] = {
.modalias = "spidev",
.bus_num = 0,
.chip_select = 0,
.irq = IRQ_EINT9,
.max_speed_hz = 500*1000,
},
};
static struct s3c2410_spi_info s3c2410_spi0_platdata = {
.pin_cs = S3C2410_GPG
(2),
.num_cs = 1,
.bus_num = 0,
};
//end add spi
然后在函数__initmini2440_machine_init的开头增加下列代码
//spiaddbyshiguang
s3c_device_spi0.dev.platform_data=&s3c2410_spi0_platdata;
spi_register_board_info(s3c2410_spi0_board,ARRAY_SIZE(s3c2410_spi0_board));
//endspi
在mini2440_devices数组的最后中添加
&s3c_device_spi0,//addbyshiguang
2.修改drivers/spi/spi_s3c24xx.c文件
在文件开头增加下列代码
//addbyshiguang
#include
在s3c24xx_spi_initialsetup函数结尾增加下列代码
//addbyshiguang
s3c2410_gpio_cfgpin(hw->pdata->pin_cs,S3C2410_GPIO_OUTPUT);
s3c2410_gpio_cfgpin(0x8B,S3C2410_GPIO_SFN2);
s3c2410_gpio_cfgpin(0x8C,S3C2410_GPIO_SFN2);
s3c2410_gpio_cfgpin(0x8D,S3C2410_GPIO_SFN2);
//endadd
3.最后重新编译内核
重启mini2440,查看/dev下的设备文件
[root@ShiGuang/]#ls/dev/spidev0.0-l
crw-rw---- 1root root 153, 0Jan 108:
00/dev/spidev0.0
[root@ShiGuang/]#
4.应用程序测试
测设程序取至Linux源码包下的/home/youshan/linux-2.6.32.2/Documentation/spi/spidev_test.c,这里我再把它贴一遍。
viewplaincopytoclipboardprint?
1./*
2. * SPI testing utility (using spidev driver)
3. *
4. * Copyright (c) 2007 MontaVista Software, Inc.
5. * Copyright (c) 2007 Anton Vorontsov
6. *
7. * This program is free software; you can redistribute it and/or modify
8. * it under the terms of the GNU General Public License as published by
9. * the Free Software Foundation; either version 2 of the License.
10. *
11. * Cross-compile with cross-gcc -I/path/to/cross-kernel/include
12. */
13.
14.#include
15.#include
16.#include
17.#include
18.#include
19.#include
20.#include
21.#include
22.#include
23.
24.#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
25.
26.static void pabort(const char *s)
27.{
28. perror(s);
29. abort();
30.}
31.
32.static const char *device = "/dev/spidev1.1";
33.static uint8_t mode;
34.static uint8_t bits = 8;
35.static uint32_t speed = 500000;
36.static uint16_t delay;
37.
38.static void transfer(int fd)
39.{
40. int ret;
41. uint8_t tx[] = {
42. 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
43. 0x40, 0x00, 0x00, 0x00, 0x00, 0x95,
44. 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
45. 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
46. 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
47. 0xDE, 0xAD, 0xBE, 0xEF, 0xBA, 0xAD,
48. 0xF0, 0x0D,
49. };
50. uint8_t rx[ARRAY_SIZE(tx)] = {0, };
51. struct spi_ioc_transfer tr = {
52. .tx_buf = (unsigned long)tx,
53. .rx_buf = (unsigned long)rx,
54. .len = ARRAY_SIZE(tx),
55. .delay_usecs = delay,
56. .speed_hz = speed,
57. .bits_per_word = bits,
58. };
59.
60. ret = ioctl(fd, SPI_IOC_MESSAGE
(1), &tr);
61. if (ret == 1)
62. pabort("can't send spi message");
63.
64. for (ret = 0; ret < ARRAY_SIZE(tx); ret++) {
65. if (!
(ret % 6))
66. puts("");
67. printf("%.2X ", rx[ret]);
68. }
69. puts("");
70.}
71.
72.static void print_usage(const char *prog)
73.{
74. printf("Usage:
%s [-DsbdlHOLC3]\n", prog);
75. puts(" -D --device device to use (default /dev/spidev1.1)\n"
76. " -s --speed max speed (Hz)\n"
77. " -d --delay delay (usec)\n"
78. " -b --bpw bits per word \n"
79. " -l --loop loopback\n"
80. " -H --cpha clock phase\n"
81. " -O --cpol clock polarity\n"
82. " -L --lsb least significant bit first\n"
83. " -C --cs-high chip select active high\n"
84. " -3 --3wire SI/SO signals shared\n");
85. exit
(1);
86.}
87.
88.static void parse_opts(int argc, char *argv[])
89.{
90. while
(1) {
91. static const struct option lopts[] = {
92. { "device", 1, 0, 'D' },
93. { "speed", 1, 0, 's' },
94. { "delay", 1, 0, 'd' },
95. { "bpw", 1, 0, 'b' },
96. { "loop", 0, 0, 'l' },
97. { "cpha", 0, 0, 'H' },
98. { "cpol", 0, 0, 'O' },
99. { "lsb", 0, 0, 'L' },
100. { "cs-high", 0, 0, 'C' },
101. { "3wire", 0, 0, '3' },
102. { "no-cs", 0, 0, 'N' },
103. { "ready", 0, 0, 'R' },
104. { NULL, 0, 0, 0 },
105. };
106. int c;
107.
108. c = getopt_long(argc, argv, "D:
s:
d:
b:
lHOLC3NR", lopts, NULL);
109.
110. if (c == -1)
111. break;
112.
113. switch (c) {
114. case 'D':
115. device = optarg;
116. break;
117. case 's':
118. speed = atoi(optarg);
119. break;
120. case 'd':
121. delay = atoi(optarg);
122. break;
123. case 'b':
124. bits = atoi(optarg);
125. break;
126. case 'l':
127. mode |= SPI_LOOP;
128. break;
129. case 'H':
130. mode |= SPI_CPHA;
131. break;
132. case 'O':
133. mode |= SPI_CPOL;
134. break;
135. case 'L':
136. mode |= SPI_LSB_FIRST;
137. break;
138. case 'C':
139. mode |= SPI_CS_HIGH;
140. break;
141. case '3':
142. mode |= SPI_3WIRE;
143. break;
144. case 'N':
145. mode |= SPI_NO_CS;
146. break;
147. case 'R':
148. mode |= SPI_READY;
149. break;
150. default:
151. print_usage(argv[0]);
152. break;
153. }
154. }
155.}
156.
157.int main(int argc, char *argv[])
158.{
159. int ret = 0;
160. int fd;
161.
162. parse_opts(argc, argv);
163.
164. fd = open(device, O_RDWR);
165. if (fd < 0)
166. pabort("can't open device");
167.
168. /*
169. * spi mode
170. */
171. ret = ioctl(fd, SPI_IOC_WR_MODE, &mode);
172. if (ret == -1)
173. pabort("can't set spi mode");
174.
175. ret = ioctl(fd, SPI_IOC_RD_MODE, &mode);
176. if (ret == -1)
177. pabort("can't get spi mode");
178.
179. /*
180. * bits per word
181. */
182. ret = ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &bits);
183. if (ret == -1)
184. pabort("can't set bits per word");
185.
186. ret = ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &bits);
187. if (ret == -1)
188. pabort("can't get bits per word");
189.
190. /*
191. * max speed hz
192. */
193. ret = ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed);
194. if (ret == -1)
195. pabort("can't set max speed hz");
196.
197. ret = ioctl(fd, SPI_IOC_RD_MAX_SPEED_HZ, &speed);
198. if (ret == -1)
199. pabort("can't get max speed hz");
200.
201. printf("spi mode:
%d\n", mode);
202. printf("bits per word:
%d\n", bits);
203. printf("max speed:
%d Hz (%d KHz)\n", speed, speed/1000);
204.
205. transfer(fd);
206.
207. close(fd);
208.
209. return ret;
210.}
只需将mini2440的SPIrx和tx短接就可以收到数据。
结果如下图所示:
测试完毕!
OVER!
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