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comparison lcdtest/readops.c @ 14:5a602e512b12

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lcdtest: read ops split into command issuance and FTDI read
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 07 Apr 2018 01:19:14 +0000
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13:238a77db4134 14:5a602e512b12
1 #include <sys/types.h>
2 #include <stdio.h>
3 #include <stdlib.h>
4 #include <unistd.h>
5 #include <ftdi.h>
6
7 extern struct ftdi_context ftdi;
8
9 read_command(rs)
10 {
11 u_char cmd[8];
12
13 /* set RS */
14 cmd[0] = 0x82;
15 cmd[1] = rs ? 0x03 : 0x02;
16 cmd[2] = 0x03;
17 /* read upper byte */
18 cmd[3] = 0x90;
19 cmd[4] = 0; /* dummy addr */
20 /* read lower byte */
21 cmd[5] = 0x90;
22 cmd[6] = 0; /* dummy addr */
23 /* send immediate */
24 cmd[7] = 0x87;
25 do_ftdi_write(cmd, 8);
26 }
27
28 cmd_ri()
29 {
30 read_command(0);
31 return(0);
32 }
33
34 cmd_rd()
35 {
36 read_command(1);
37 return(0);
38 }
39
40 cmd_fr(argc, argv)
41 char **argv;
42 {
43 unsigned reqlen = strtoul(argv[1], 0, 0);
44 u_char rdbuf[256];
45 int rc, i;
46
47 if (reqlen < 1 || reqlen > sizeof rdbuf) {
48 printf("error: bad read request length\n");
49 return(-1);
50 }
51 rc = ftdi_read_data(&ftdi, rdbuf, reqlen);
52 printf("FTDI read returned %d\n", rc);
53 for (i = 0; i < rc; i++)
54 printf("read byte: %02X\n", rdbuf[i]);
55 return(0);
56 }