mjb/altos/src/drivers/ao_cc1200.c, branch tmarble-trng

altos: Replace ao_alarm/ao_clear_alarm with ao_sleep_for

2015-02-14T07:51:10+00:00

Having arbitrary alarms firing in the middle of complicated device logic makes no sense at all. Therefore only correct use of ao_alarm and ao_clear_alarm was around a specific ao_sleep call, with correct recovery in case the alarm fires. This patch replaces all uses of ao_alarm/ao_sleep/ao_clear_alarm with ao_sleep_for, a new function which takes the alarm timeout directly. A few cases which weren't simply calling ao_sleep have been reworked to pass the timeout value down to the place where sleep *is* being called, and having that code deal with the return correctly. Signed-off-by: Keith Packard

altos/cc1200: With PQT wide open, we can't use PQT_REACHED for start

2014-11-24T02:56:40+00:00

Because we're allowing even signals only weakly correlated with the preamble through to sync detection, we can't use the PQT_REACHED symbol to tell when a packet header has been seen. Instead, just look for SYNC_FOUND. Signed-off-by: Keith Packard

altos/cc1200: Wait for packet to be placed in FIFO during receive

2014-11-24T02:31:15+00:00

This changes the receive code to use MCU_STATUS, waiting for MARC_STATUS1 to indicate that the packet is in the fifo before reading it out. It also fixes the receive timeout code to keep receiving if the preamble or sync have been seen when the timeout fires. This makes TeleLCO able to use short timeouts during scanning while still successfully receiving packets. Signed-off-by: Keith Packard

altos: Reset interrupt flags before TX in CC1200 driver

2014-11-07T04:04:47+00:00

Failing to reset the flags set during interrupt leads to short-circuiting transmission and not a lot of packets going out. Signed-off-by: Keith Packard

altos: Use AO_SPO_SPEED_FAST for CC1200

2014-11-07T00:01:24+00:00

This asks for the fastest available SPI speed, instead of fixing it to 8MHz, which may not be supported on every architecture. Signed-off-by: Keith Packard

altos: Increase CC1200 SPI data rate to 8MHz

2014-10-26T04:14:25+00:00

This got set to 125kHz to make debugging with a logic analyzer easier and never changed back to a reasonable speed. Signed-off-by: Keith Packard

altos: Perform cc1200 calibration less often. Tweak radio params

2014-10-26T00:44:48+00:00

This performs calibration after every 4 operations, or when the frequency changes. This reduces the time it takes to get to receive mode. This also makes the sync and preamble qualifiers more strict to reject bad packets. Signed-off-by: Keith Packard

altos: Complete cc1200 driver

2014-10-25T04:24:53+00:00

Deal with differences between cc1120 and cc1200, including built-in packet support and various register changes. This now works to send and receive telemetry, as well as send APRS and RDF. Signed-off-by: Keith Packard

altos: Copy cc1120 driver to cc1200 driver and hack a bit

2014-10-05T07:03:28+00:00

The cc1200 is similar to the cc1120, although many registers have changed. This driver can send a bare carrier and an RDF tone, but does not yet receive or transmit telemetry data. Signed-off-by: Keith Packard