1
0
mirror of https://github.com/RIOT-OS/RIOT.git synced 2024-12-29 04:50:03 +01:00
Commit Graph

5 Commits

Author SHA1 Message Date
Marian Buschsieweke
36e8526046
drivers/periph_gpio_ll: change API to access GPIO ports
The API was based on the assumption that GPIO ports are mapped in memory
sanely, so that a `GPIO_PORT(num)` macro would work allow for constant
folding when `num` is known and still be efficient when it is not.

Some MCUs, however, will need a look up tables to efficiently translate
GPIO port numbers to the port's base address. This will prevent the use
of such a `GPIO_PORT(num)` macro in constant initializers.

As a result, we rather provide `GPIO_PORT_0`, `GPIO_PORT_1`, etc. macros
for each GPIO port present (regardless of MCU naming scheme), as well as
`GPIO_PORT_A`, `GPIO_PORT_B`, etc. macros if (and only if) the MCU port
naming scheme uses letters rather than numbers.

These can be defined as macros to the peripheral base address even when
those are randomly mapped into the address space. In addition, a C
function `gpio_port()` replaces the role of the `GPIO_PORT()` and
`gpio_port_num()` the `GPIO_PORT_NUM()` macro. Those functions will
still be implemented as efficient as possible and will allow constant
folding where it was formerly possible. Hence, there is no downside for
MCUs with sane peripheral memory mapping, but it is highly beneficial
for the crazy ones.

There are also two benefits for the non-crazy MCUs:
1. We can now test for valid port numbers with `#ifdef GPIO_PORT_<NUM>`
    - This directly benefits the test in `tests/periph/gpio_ll`, which
      can now provide a valid GPIO port for each and every board
    - Writing to invalid memory mapped I/O addresses was treated as
      triggering undefined behavior by the compiler and used as a
      optimization opportunity
2. We can now detect at compile time if the naming scheme of the MCU
   uses letters or numbers, and produce more user friendly output.
    - This is directly applied in the test app
2024-08-02 09:55:24 +02:00
Marian Buschsieweke
922276296e
drivers/periph/gpio_ll: pass gpio_conf_t by value
Now that `gpio_conf_t` is on all implemented platforms no larger than
a register, we can more efficiently pass it by value rather than via
pointer.
2024-01-21 09:19:08 +01:00
Marian Buschsieweke
2a00ec13e5
drivers/periph/gpio_ll: shrink gpio_conf_t
This commit optimizes the `gpio_conf_t` type in the following
regards:

- The "base" `gpio_conf_t` is stripped from members that only some
  platforms support, e.g. drive strength, slew rate, and disabling of
  the Schmitt Trigger are no longer universally available but
  platform-specific extensions
- The `gpio_conf_t` is now crammed into a bit-field that is 8 bit or
  16 bit wide. This allows for storing lots of them e.g. in
  `driver_foo_params_t` or `uart_conf_t` etc.
- A `union` of the `struct` with bit-field members and a `bits` is used
  to allow accessing all bits in a simple C statement and to ensure
  alignment for efficient handling of the type

Co-authored-by: Gunar Schorcht <gunar@schorcht.net>
2024-01-21 08:38:40 +01:00
Hugues Larrive
3c465836f2 examples and tests: add atmega8 to relevent Makefile.ci
using dist/tools/insufficient_memory/add_insufficient_memory_board.sh
2023-07-11 21:22:02 +02:00
bdd4705733
tests: move bench_ applications to bench/ subdirectory 2023-05-10 09:49:56 +02:00