FreeCalypso > hg > freecalypso-hwlab

annotate lcdtest/busops.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
parents 238a77db4134
children 4b7cac119fb5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
12
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1 #include <sys/types.h>
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2 #include <stdio.h>
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3 #include <stdlib.h>
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4 #include <unistd.h>
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5 #include <ftdi.h>
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6
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7 extern struct ftdi_context ftdi;
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8
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9 do_ftdi_write(cmd, cmdlen)
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10 u_char *cmd;
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11 {
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12 if (ftdi_write_data(&ftdi, cmd, cmdlen) != cmdlen) {
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13 fprintf(stderr, "FTDI write error: %s\n", ftdi.error_str);
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14 exit(1);
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15 }
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16 }
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17
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18 set_gpio_pins(rs, reset)
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19 {
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20 u_char cmd[3];
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21
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22 cmd[0] = 0x82;
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23 cmd[1] = (rs ? 1 : 0) | (reset ? 2 : 0);
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24 cmd[2] = 0x03;
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25 do_ftdi_write(cmd, 3);
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26 }
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27
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28 reset_pulse()
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29 {
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30 set_gpio_pins(0, 0);
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31 usleep(50000);
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32 set_gpio_pins(0, 1);
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33 return(0);
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34 }
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35
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36 write_ir(val16)
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37 unsigned val16;
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38 {
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39 u_char cmd[9];
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40
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41 /* set RS low */
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42 cmd[0] = 0x82;
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43 cmd[1] = 0x02;
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44 cmd[2] = 0x03;
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45 /* write upper byte */
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46 cmd[3] = 0x92;
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47 cmd[4] = 0; /* dummy addr */
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48 cmd[5] = val16 >> 8;
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49 /* write lower byte */
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50 cmd[6] = 0x92;
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51 cmd[7] = 0; /* dummy addr */
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52 cmd[8] = val16;
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53 do_ftdi_write(cmd, 9);
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54 }
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55
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56 write_dr(val16)
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57 unsigned val16;
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58 {
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59 u_char cmd[9];
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60
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61 /* set RS high */
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62 cmd[0] = 0x82;
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63 cmd[1] = 0x03;
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64 cmd[2] = 0x03;
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65 /* write upper byte */
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66 cmd[3] = 0x92;
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67 cmd[4] = 0; /* dummy addr */
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68 cmd[5] = val16 >> 8;
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69 /* write lower byte */
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70 cmd[6] = 0x92;
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71 cmd[7] = 0; /* dummy addr */
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72 cmd[8] = val16;
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73 do_ftdi_write(cmd, 9);
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74 }