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comparison 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
comparison
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13:238a77db4134 14:5a602e512b12
70 cmd[6] = 0x92; 70 cmd[6] = 0x92;
71 cmd[7] = 0; /* dummy addr */ 71 cmd[7] = 0; /* dummy addr */
72 cmd[8] = val16; 72 cmd[8] = val16;
73 do_ftdi_write(cmd, 9); 73 do_ftdi_write(cmd, 9);
74 } 74 }
75
76 bus_read(rs)
77 {
78 u_char cmd[8], resp[2];
79
80 /* set RS */
81 cmd[0] = 0x82;
82 cmd[1] = rs ? 0x03 : 0x02;
83 cmd[2] = 0x03;
84 /* read upper byte */
85 cmd[3] = 0x90;
86 cmd[4] = 0; /* dummy addr */
87 /* read lower byte */
88 cmd[5] = 0x90;
89 cmd[6] = 0; /* dummy addr */
90 /* send immediate */
91 cmd[7] = 0x87;
92 do_ftdi_write(cmd, 8);
93 if (ftdi_read_data(&ftdi, resp, 2) != 2) {
94 fprintf(stderr, "FTDI read error: %s\n", ftdi.error_str);
95 exit(1);
96 }
97 return (resp[0] << 8) | resp[1];
98 }