f654df0e78
- Fully open toolchain: arm-none-eabi-gcc inside Podman/Docker container - Platform-agnostic build via justfile (auto-detects podman vs docker) - CMake + Ninja build system with arm-none-eabi toolchain file - nRF52840 linker script and startup with full 64-entry vector table - Register access via typed bitfield unions (include/regs.h) - FHSS channel sequencer: AES-128-ECB PRNG over 40 channels (2402-2480 MHz) - Low-power sleep via SYSTEM_ON WFI + GPIOTE wakeup on button press - Vendor deps as shallow git submodules: nrfx, CMSIS_5, tiny-AES-c
38 lines
781 B
C
38 lines
781 B
C
#include "power.h"
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#include "regs.h"
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#include <nrf52840.h>
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#include <cmsis_gcc.h>
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/* P0.02 on XIAO BLE — adjust to match your schematic */
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#define BUTTON_PIN 2u
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void power_init(void)
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{
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/* DC/DC converter has lower quiescent current than the LDO */
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NRF_POWER->DCDCEN = 1u;
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NRF_GPIOTE->CONFIG[0] = (gpiote_config_t){
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.bit = {
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.MODE = GPIOTE_MODE_EVENT,
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.PSEL = BUTTON_PIN,
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.PORT = 0u,
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.POLARITY = GPIOTE_POL_LOTOHI,
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}
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}.reg;
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NRF_GPIOTE->INTENSET = (gpiote_inten_t){ .bit.IN0 = 1u }.reg;
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NVIC_EnableIRQ(GPIOTE_IRQn);
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}
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void power_sleep_until_button(void)
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{
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NRF_POWER->TASKS_LOWPWR = 1u;
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__WFI();
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}
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void GPIOTE_IRQHandler(void)
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{
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NRF_GPIOTE->EVENTS_IN[0] = 0u;
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}
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