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annotate serial/spenh.c @ 53:fbedb67d234f

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serial: fix parity for inverse coding convention Important note: it is my (Mother Mychaela's) understanding that SIM cards with inverse coding convention are extremely rare, and I have never seen such a card. Therefore, our support for the inverse coding convention will likely remain forever untested.
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 21 Mar 2021 20:46:09 +0000
parents 6cc3eea720cb
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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6cc3eea720cb serial: speed enhancement implemented
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1 /*
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2 * This module implements speed enhancement logic for our serial
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3 * SIM interface back end.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9
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10 extern u_char atr_buf[];
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11 extern unsigned baud_spenh, spenh_host_max;
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fbedb67d234f serial: fix parity for inverse coding convention
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12 extern int inverse_coding;
42
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13
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14 void
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15 spenh_logic()
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16 {
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17 unsigned spenh_sim_max, use_spenh;
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18 u_char pts_req[4], pts_resp[4];
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19 int rc;
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20
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21 if (!(atr_buf[1] & 0x10)) {
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22 no_spenh: printf("X SIM does not support speed enhancement\n");
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23 return;
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24 }
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25 switch (atr_buf[2]) {
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26 case 0x94:
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27 spenh_sim_max = 1;
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28 break;
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29 case 0x95:
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30 spenh_sim_max = 2;
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31 break;
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32 case 0x96:
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33 spenh_sim_max = 4;
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34 break;
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35 case 0x97:
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36 spenh_sim_max = 8;
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37 break;
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38 default:
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39 goto no_spenh;
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40 }
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41 use_spenh = spenh_sim_max;
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42 if (use_spenh > spenh_host_max)
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43 use_spenh = spenh_host_max;
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44 pts_req[0] = 0xFF;
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45 pts_req[1] = 0x10;
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46 switch (use_spenh) {
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47 case 1:
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48 pts_req[2] = 0x94;
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49 break;
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50 case 2:
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51 pts_req[2] = 0x95;
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52 break;
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53 case 4:
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54 pts_req[2] = 0x96;
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55 break;
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56 case 8:
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57 pts_req[2] = 0x97;
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58 break;
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59 }
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60 pts_req[3] = pts_req[0] ^ pts_req[1] ^ pts_req[2];
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61 rc = send_bytes_to_sim(pts_req, 4);
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62 if (rc < 0)
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63 exit(1);
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64 rc = collect_bytes_from_sim(pts_resp, 4);
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65 if (rc < 0)
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66 exit(1);
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67 if (bcmp(pts_req, pts_resp, 4)) {
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68 fprintf(stderr, "error: PTS response does not match request\n");
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69 exit(1);
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70 }
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71 set_serial_params(baud_spenh * use_spenh, inverse_coding);
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72 printf("X Using F=512 D=%u speed enhancement\n", use_spenh * 8);
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73 }