Also adapt the defines to the documentation
- CPUs define up to 4 power modes (from zero, the lowest power mode,
to PM_NUM_MODES-1, the highest)
- >> there is an implicit extra idle mode (which has the number PM_NUM_MODES) <<
Previously on saml21 this would always generate pm_set(3) which is an illegal state.
Now pm_layered will correctly generate pm_set(2) for IDLE modes.
Idle power consumption dropped from 750µA to 368µA and wake-up from standby is also
possible. (Before it would just enter STANDBY again as the mode register was never
written with the illegal value.)
This moves the following modules to a architecture-specific Makefile.dep
file:
- cortexm_common
- cortexm_common_periph
- newlib
- newlib_nano
- periph
Add a fucntion to switch between LDO and Buck concerter to provide the
internal CPU voltage.
The Buck Converter is not compatible with internal fast oscillators (DFLL, DPLL)
and requires an inductivity to be present on the board.
The ROM size is encoded in the part number of the Atmel SAM chips.
RAM size is not encoded directly, so get it by parsing the chip's vendor file.
The file remains in the page cache for the compiler to use, so the overhead
should be minimal:
on master:
Benchmark #1: make BOARD=samr21-xpro -j
Time (mean ± σ): 527.9 ms ± 4.9 ms [User: 503.1 ms, System: 69.6 ms]
Range (min … max): 519.7 ms … 537.2 ms 10 runs
with this patch:
Benchmark #1: make BOARD=samr21-xpro -j
Time (mean ± σ): 535.6 ms ± 4.0 ms [User: 507.6 ms, System: 75.1 ms]
Range (min … max): 530.6 ms … 542.0 ms 10 runs
All the more recent vendor files have them, so include them for samr30 too.
It is expected for this to become obsolete with the next vendor file update.
For consistency, use named GCLKs.
- `SAM0_GCLK_32KHZ` will always be 2 for samd21
- `SAM0_GCLK_MAIN` will always be 0
So no change in functionality, just makes the code easier to understand.
Creating an `exti_config` array for a new MCU manually is tedious and error prone.
Luckiely all information is already availiable in the vendor files.
Credit for this discovery & method goes to @Sizurka
The file was generated with
```C
int main(void) {
puts("static const int8_t exti_config[PORT_GROUPS][32] = {");
for (unsigned port = 1; port < 5; ++port) {
printf("#if PORT_GROUPS >= %d\n{\n", port);
for (unsigned pin = 0; pin < 32; ++pin) {
printf("#ifdef PIN_P%c%02uA_EIC_EXTINT_NUM\n", '@' + port, pin);
printf(" PIN_P%c%02uA_EIC_EXTINT_NUM,\n", '@' + port, pin);
printf("#else\n -1,\n#endif\n");
}
printf("},\n#endif\n\n");
}
puts("};");
return 0;
}
```
No changes in generated code are expected, but this makes adding new members
of the sam0 CPU families much easier.
samr30 is the only MCU of this family where the vendor files do not
define the PIN_($pin)_EIC_EXTINT_NUM macro yet.
This macro is needed to create a generic EXTI configuration for all
sam0 MCUs.
The defines were generated with
sed -Ei '/define PIN_(.*)_EIC_EXTINT([0-9]*)/
{h; x;
s/define PIN_(.*)A_EIC_EXTINT([0-9]*)(.*)/
define PIN_\1A_EIC_EXTINT_NUM _L_\(\2\)
\/**< \brief EIC signal: PIN_\1 External Interrupt Line *\/
/g; G}' samr30g18a.h samr30e18a.h
bitarithm.h is not needed for the interface of shed but may cause conflicts
due to different definitions of SETBIT and CLRBIT
common implementations are: (value, offset) xor (value, mask) bitarithm
implements the later
frac.c and nrf52/usbdev.c use bitarithm.h but where missing the include
sam0/rtt.c defined a bit using mask from bitarithm,
changed that to the soulution used in sam0/rtc.c
Instead of hard-coding the peripheral clocks to CLOCK_CORECLOCK
introduce helper functions to return the frequency of the individual
GCLKs and use those for baud-rate calculations.
This requires the GCLK to be part of the peripheral's config struct.
While this is already the case for most peripherals, this also adds
it for those where it wasn't used before.
As it defaults to 0 (CLOCK_CORECLOCK) no change is to be expected.
To simplify board definitions and for unification between samd2x and
newer models, don't use the GCLK bitmask in board definitions.
Instead use the GCLK index and generate the bitmask when needed.
The common ADC API dictates that a sample call must return -1 on an
incorrect resolution. The sam0 ADC implementation instead threw an
assertion failure.
