FreeCalypso > hg > fc-sim-tools
view serial/spenh.c @ 47:b0cf75d0bb2d
doc/Serial-SIM-readers article written
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 21 Mar 2021 04:32:18 +0000 |
parents | 6cc3eea720cb |
children | fbedb67d234f |
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/* * This module implements speed enhancement logic for our serial * SIM interface back end. */ #include <sys/types.h> #include <stdio.h> #include <stdlib.h> extern u_char atr_buf[]; extern unsigned baud_spenh, spenh_host_max; void spenh_logic() { unsigned spenh_sim_max, use_spenh; u_char pts_req[4], pts_resp[4]; int rc; if (!(atr_buf[1] & 0x10)) { no_spenh: printf("X SIM does not support speed enhancement\n"); return; } switch (atr_buf[2]) { case 0x94: spenh_sim_max = 1; break; case 0x95: spenh_sim_max = 2; break; case 0x96: spenh_sim_max = 4; break; case 0x97: spenh_sim_max = 8; break; default: goto no_spenh; } use_spenh = spenh_sim_max; if (use_spenh > spenh_host_max) use_spenh = spenh_host_max; pts_req[0] = 0xFF; pts_req[1] = 0x10; switch (use_spenh) { case 1: pts_req[2] = 0x94; break; case 2: pts_req[2] = 0x95; break; case 4: pts_req[2] = 0x96; break; case 8: pts_req[2] = 0x97; break; } pts_req[3] = pts_req[0] ^ pts_req[1] ^ pts_req[2]; rc = send_bytes_to_sim(pts_req, 4); if (rc < 0) exit(1); rc = collect_bytes_from_sim(pts_resp, 4); if (rc < 0) exit(1); if (bcmp(pts_req, pts_resp, 4)) { fprintf(stderr, "error: PTS response does not match request\n"); exit(1); } set_serial_params(baud_spenh * use_spenh); printf("X Using F=512 D=%u speed enhancement\n", use_spenh * 8); }