altos: custom hex printer for telemetry packets

Using printf is way too slow with pdclib; just hand-write hex byte output.

Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/src/core/ao_monitor.c b/src/core/ao_monitor.c
index 4ca641b74d7ed59307b4590b8d2d5394fefa3c6b..51d614254ab5e19db14a0cd6c89fb7ae887f30de 100644 (file)
--- a/src/core/ao_monitor.c
+++ b/src/core/ao_monitor.c
@@ -103,6 +103,13 @@ ao_monitor_blink(void)
 
 #if HAS_MONITOR_PUT
 
+static const char xdigit[16] = {
+       '0', '1', '2', '3', '4', '5', '6', '7',
+       '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
+};
+
+#define hex(c) do { putchar(xdigit[(c) >> 4]); putchar(xdigit[(c)&0xf]); } while (0)
+
 void
 ao_monitor_put(void)
 {
@@ -210,14 +217,27 @@ ao_monitor_put(void)
                        break;
 #endif /* LEGACY_MONITOR */
                default:
-                       printf ("TELEM %02x", ao_monitoring + 2);
+#if AO_PROFILE
+               {
+                       extern uint32_t ao_rx_start_tick, ao_rx_packet_tick, ao_rx_done_tick, ao_rx_last_done_tick;
+                       extern uint32_t ao_fec_decode_start, ao_fec_decode_end;
+
+                       printf ("between packet: %d\n", ao_rx_start_tick - ao_rx_last_done_tick);
+                       printf ("receive start delay: %d\n", ao_rx_packet_tick - ao_rx_start_tick);
+                       printf ("decode time: %d\n", ao_fec_decode_end - ao_fec_decode_start);
+                       printf ("rx cleanup: %d\n", ao_rx_done_tick - ao_fec_decode_end);
+               }
+#endif
+                       printf("TELEM ");
+                       hex((uint8_t) (ao_monitoring + 2));
                        sum = 0x5a;
                        for (state = 0; state < ao_monitoring + 2; state++) {
                                byte = recv_raw.packet[state];
                                sum += byte;
-                               printf("%02x", byte);
+                               hex(byte);
                        }
-                       printf("%02x\n", sum);
+                       hex(sum);
+                       putchar ('\n');
 #if HAS_RSSI
                        if (recv_raw.packet[ao_monitoring + 1] & PKT_APPEND_STATUS_1_CRC_OK) {
                                rssi = ((int16_t) recv_raw.packet[ao_monitoring] >> 1) - 74;