The mv instruction (which is usually implemented as `add rd, x0, r1`) is
changed to `add rd, x0, %input`. This can either be used as a load
immediate or as an move.
The code size grows by two bytes. This because GCC does not compress the
li instruction to the compressed version (even though this is possible).
Add ENABLE_DEBUG_VERBOSE flag, so that the noise during debugging can be
reduced. This is super helpful when testing under load, as otherwise there is
just too much noise in the output.
An earlier version of periph_eth used to always pack the first chunk of the
outgoing frame to the first DMA descriptor by telling the DMA to jump back
to the first descriptor within the last descriptor. This worked fine unless
the frame was send in one chunk (as e.g. lwip does), which resulted due to a
hardware bug in a frame being send out twice. For that reason, the behavior was
changed to cycle throw the linked DMA descriptor list in round-robin fashion.
However, the error checking was not updated accordingly. Hence, the error
check might run over (parts of) unrelated frames and fail to detect errors
correctly.
This commit fixes the issue and also provides proper return codes for errors.
Additionally, an DMA reset is performed on detected errors during RX/TX. I'm
not sure if/when this is needed, as error conditions are neigh impossible to
produce. But better be safe than sorry.
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>
The module cpu_atmega_common_cxx seems to be non-existing and not used. It is
unclear whether this slipped in by accident or if this was actually useful at
some point in time. In any case, the module is not present (anymore) and cannot
be used, so let's clean up the Makefile.
This initial I2C support allows to use the I2C bus in controller mode to
interact with multiple peripherals in blocking mode. The CPU will
perform a busy wait when transferring data over I2C.
Split out Gunar Schorcht's clever approach to provide thread safe malloc for
AVR into a system module and make AVR depend on this. This allows other
platforms to also use this.
If the same callback function is used for multiple interfaces
(`NETDEV_INDEX_ANY`), it is necessary to also provide the index of
the interface to hand out and address.
The DAC can have some start-up delay.
If we try to write to it before it's ready, it will get stuck.
This happens now that `tests/driver_dac_dds` immediately sets a DAC
value after init.
The samd2x class of MCUs doesn't have this bit, but a quick test on
samd10 shows that it might not be nececary there - the DAC does not
get stuck when writing to it immediately after init.
Add periph_uart_nonblocking. Since cc2538 has a transmit FIFO write
to the FIFO first and to a tsrb buffer only when the transmit FIFO
is full.
Rely on the FIFO TXIFLSEL condition to fill up FIFO as space becomes
available.
The bit access functions are not tied to Cortex-M CPUs, here they only
provide optimisations via bit-banding.
But the functions are generally useful - so move them to an arch independent
location.
This patch implements the real time clock module for the QN908X cpus.
This module is very straightforward with only the one notable drawback
that it doesn't have a match register like the CTIMER block to implement
the alarm function. Instead, this driver can only use the interrupt
generated ever 1 second to implement the alarm match comparison in
software.
The IRQ for each GPIO port needs to be enabled in the NVIC on top of
enabling the corresponding bit in the GPIO port.
This was not caught in tests before because I was testing with a larger
stack of commits (including UART and timers) which also had this fix.
Manually poking the GPIOs while using tests/periph_gpio now properly
fires the interrupts.
The QN908x CPU has several timer modules: one RTC (Real-Time Clock) that
can count from the 32kHz internal clock or 32.768 kHz external clock,
four CTIMER that use the APB clock and have four channels each and one
SCT timer with up to 10 channels running on the AHB clock.
This patch implements a timer driver for the CTIMER blocks only, which
is enough to make the xtimer module work. Future patches should improve
on this module to support using the RTC CNT2 32-bit free-running
counter unit and/or the SCT timer.
