+static int write_bkm_frame(FILE *f, const uint8_t *data)
+{
+ /* ?0SA 00DU, ?1CB RLDU */
+ static const char ref[] = "UDLRABCSXYZM";
+ static const char bits[] = { 0,1,2,3, 12,4,5,13, 16,16,16,16 };
+ uint32_t idata[2];
+ int p, i;
+
+ if (f == NULL) {
+ fprintf(stderr, "%s called without outfile\n", __func__);
+ goto out;
+ }
+
+ idata[0] = 0x10000 | (data[0] << 8) | data[1];
+ idata[1] = ~0;
+
+ fprintf(f, "|.|");
+ for (p = 0; p < 2; p++) {
+ for (i = 0; i < 12; i++)
+ fprintf(f, "%c", (idata[p] & (1 << bits[i])) ? '.' : ref[i]);
+ fprintf(f, "|");
+ }
+ fprintf(f, "|\n");
+
+out:
+ return 2;
+}
+
+static int tas_data_to_teensy(uint8_t b, uint8_t *data)
+{
+ /* SCBA RLDU */
+ /* v */
+ /* ?0SA 00DU, ?1CB RLDU */
+ data[0] = (b & 0x13) | ((b >> 2) & 0x20);
+ data[1] = (b & 0x0f) | ((b >> 1) & 0x30);
+ return 2;
+}
+