gh-raspberrypi/pico-sdk

Watch

Flag functions constexpr #2807

New issue

Open

opened 2026-01-26 15:18:47 -06:00 by michalelektryk · 0 comments

michalelektryk commented

2026-01-26 15:18:47 -06:00

(Migrated from github.com)

There are many pure functions in the SDK that could be marked as constexpr to provide more compile time computation and verification. It'd also allow for compile time allocation of internal resources. One example being pwm_gpio_to_channel and pwm_gpio_to_slice_num. If they'd be marked constexpr then following code would be valid:

constexpr int pwm_gpio = xxx;
static_assert(pwm_gpio_to_channel(pwm_gpio) == 0); // because we DMA 2B only we need it to be lower half of the register

There are many pure functions in the SDK that could be marked as constexpr to provide more compile time computation and verification. It'd also allow for compile time allocation of internal resources. One example being `pwm_gpio_to_channel` and `pwm_gpio_to_slice_num`. If they'd be marked constexpr then following code would be valid: ``` constexpr int pwm_gpio = xxx; static_assert(pwm_gpio_to_channel(pwm_gpio) == 0); // because we DMA 2B only we need it to be lower half of the register ```

Sign in to join this conversation.

No labels

can't reproduce

code cleanliness

compiler version issues

hardware_clocks

hardware_exception

hardware_watchdog

needs reporter detail

newlib-multicore

pico_async_context

pico_binary_info

wifi integration

No milestone

No assignees

1 participant

Notifications

Due date

The due date is invalid or out of range. Please use the format "yyyy-mm-dd".

No due date set.

Dependencies

No dependencies set

Reference

gh-raspberrypi/pico-sdk#2807

No description provided.