as we do not build the periph drivers selectable currently,
the guard is triggered even for boards that do not have any
PWM defined and don't want to use it...
First start calculating the CRC in hardware when receiving a frame.
Then, other than the at86rf2xx transceivers the cc2420 don't consider the
CRC_OK flag when reporting a successful packet reception. This change
introduces a check for this bit and drops the packet else by flushing
the RX FIFO.
When redoing the SPI driver for the msp430 platforms an assert
statement was introduced to prohibit SPI access without any
buffers. Since in the existing code the FIFO pointer is incremented
through a dummy read this results in triggering aforementioned
assert.
It was pointed out that after a state change to RX_AACK_ON reading back
the state to confirm the transition can fail due to an imidiate change
into BUSY_RX_AACK between the successful change on the transceiver and
querying the state.
For this we exclude the readback of the state for transitions to
RX_AACK_ON.
The rational behind this change is the following:
If the transceiver is in any *_BUSY state when `at86rf2xx_set_state()`
gets called this would bypass the `(state == old_state)` check and
unneeded state transitions could be triggered.
without this patch, tx_power is directly set on the device but not in
gnrc_netdev_t. Thus, calling ifconfig in shell shows tx_power always
at 0dBm, never showing the correct, current value. Additionally, it
verifies that given tx_power to be set is in valid range.
`len` and `count` are both values that should never go `< 0`, so instead of
having to test this (in theory) every time the function is called (regardless
of by assert or if its unnecessary code), I propose to change it to `size_t`.
As a bonus I made the type of recv's buf parameter generic - no reason for it to
be a char and it might lead to unnecessary static casting requirements
This patch adds two new options to netopt. NETOPT_CCA_MODE to set
the CCA mode corresponding to the respective PHY standard and
NETOPT_RF_TESTMODE to set the test mode for the radio.
