CPU_HAS_SRAM_BITBAND can be used to check whether bit-banding is supported for
all of SRAM. With partially supported bit-banding, this feature is more of a
foot gun that a valuable tool.
This commit fixes the CCA threshold range for set_cca_threshold.
Without this commit the threshold overflows when using values below
the receiver sensitivity.
This commit turns off the transceiver immediately after sending an ACK
frame in order to avoid unwanted emissions (see ERRATA ID 204).
When the radio stays in TX_ON without an explicit transition, the radio
keeps sending a spurious signal for some milliseconds.
This commit sets the correct value to the MCU_CTRL bit for the
cc2538_rf. This variable is used to detect when the radio is doing
transmission with CCA. Since this was not set to 1 when sending without
CCA, the `confirm_transmit` function returned -EAGAIN after the TX_DONE
event (which violates the HAL API).
This error was discovered using some Radio HAL riotctrl scripts by @LarsKowoll.
`gnrc_netif_hdr_build()` calls internally `gnrc_netif_hdr_init()`, which does
initialize `gnrc_netif_hdr_t::rssi` and `gnrc_netif_hdr_t::lqi`. So no need to
do this twice.
Errate 2.17.4 says:
> Upon enabling the RTC tamper detection feature, a false tamper
> detection *can* be reported by the RTC.
It turns out that this spurious event is not always generated.
If RTC alarm is used and the CPU was previously woken from hibernate
by RTC, it *can* happen that the false tamper event is *not* generated.
In this case, we will block indefinitely on the mutex.
To solve this, add a timeout to the event.
Also poll the event instead of using a mutex, as we have already set
`PM->SLEEPCFG.bit.SLEEPMODE` at this point.
Split atmega_common code into avr8_common folder. This moves common
avr8 code to be used for all avr8 variants: tiny, mega and xmega.
Signed-off-by: Gerson Fernando Budke <nandojve@gmail.com>
Split cpu.c file into cpu.c and atmega_cpu.c files. This extract mega
specific code from common code.
Signed-off-by: Gerson Fernando Budke <nandojve@gmail.com>
