FreeCalypso > hg > freecalypso-hwlab

annotate lcdtest/busops.c @ 71:bac08ce19c08

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DUART28C USB ID assigned
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 30 Jul 2020 04:53:27 +0000
parents 4b7cac119fb5
children
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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 #include "exitcodes.h"
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7
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8 extern struct ftdi_context ftdi;
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9
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10 do_ftdi_write(cmd, cmdlen)
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11 u_char *cmd;
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12 {
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13 if (ftdi_write_data(&ftdi, cmd, cmdlen) != cmdlen) {
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14 fprintf(stderr, "FTDI write error: %s\n", ftdi.error_str);
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15 exit(ERROR_FTDI);
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16 }
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17 }
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18
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19 set_gpio_pins(rs, reset)
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20 {
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21 u_char cmd[3];
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22
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23 cmd[0] = 0x82;
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24 cmd[1] = (rs ? 1 : 0) | (reset ? 2 : 0);
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25 cmd[2] = 0x03;
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26 do_ftdi_write(cmd, 3);
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27 }
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28
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29 reset_pulse()
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30 {
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31 set_gpio_pins(0, 0);
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32 usleep(50000);
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33 set_gpio_pins(0, 1);
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34 return(0);
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35 }
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36
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37 write_ir(val16)
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38 unsigned val16;
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39 {
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40 u_char cmd[9];
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41
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42 /* set RS low */
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43 cmd[0] = 0x82;
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44 cmd[1] = 0x02;
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45 cmd[2] = 0x03;
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46 /* write upper byte */
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47 cmd[3] = 0x92;
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48 cmd[4] = 0; /* dummy addr */
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49 cmd[5] = val16 >> 8;
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50 /* write lower byte */
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51 cmd[6] = 0x92;
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52 cmd[7] = 0; /* dummy addr */
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53 cmd[8] = val16;
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54 do_ftdi_write(cmd, 9);
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55 }
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56
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57 write_dr(val16)
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58 unsigned val16;
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59 {
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60 u_char cmd[9];
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61
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62 /* set RS high */
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63 cmd[0] = 0x82;
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64 cmd[1] = 0x03;
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65 cmd[2] = 0x03;
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66 /* write upper byte */
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67 cmd[3] = 0x92;
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68 cmd[4] = 0; /* dummy addr */
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69 cmd[5] = val16 >> 8;
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70 /* write lower byte */
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71 cmd[6] = 0x92;
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72 cmd[7] = 0; /* dummy addr */
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73 cmd[8] = val16;
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74 do_ftdi_write(cmd, 9);
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75 }