c9320eb9db
radio_tx_burst(): captures current slot, calls fhss_next_channel() to advance the sequence, sets channel, transmits ptt_frame_t, then holds the dwell window via TIMER0 so the receiver has the full 2 ms to listen. radio_rx_burst(): advances to the same channel, enables RX, waits for EVENTS_END or TIMER0 COMPARE0 expiry. On a valid CRC the ptt_frame_t is returned; caller syncs FHSS with fhss_set_slot(frame.slot + 1). TIMER0: configured once in radio_init() (MODE=Timer, BITMODE=16-bit, PRESCALER=4 -> 1 MHz tick, CC[0]=2000 -> 2 ms, COMPARE0_STOP shortcut). fhss.c: replace zero key with a non-trivial 128-bit value; add fhss_set_slot() and fhss_get_slot() for RX synchronisation. power.c: add BUTTON_ACTIVE_LOW flag (default 1 = pull-up + GND button); configure PIN_CNF accordingly; implement power_button_pressed() via NRF_P0->IN. regs.h: add gpio_pin_cnf_t with GPIO_PULL_* constants. main.c: tight PTT loop -- radio_tx_burst() while button held, otherwise radio_rx_burst() with slot sync on reception. No WFI in RX mode.
24 lines
650 B
C
24 lines
650 B
C
/**
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* @file power.h
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* @brief Power management: DC/DC regulator, GPIOTE wakeup, WFI sleep.
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*/
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#pragma once
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#include <stdbool.h>
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/** @brief Enable the DC/DC converter, configure GPIO input and GPIOTE wakeup on the PTT button. */
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void power_init(void);
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/**
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* @brief Enter SYSTEM_ON low-power sleep and return on the next GPIOTE event.
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*
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* Sets TASKS_LOWPWR then executes WFI. The CPU wakes when the GPIOTE
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* interrupt fires (button press) and resumes from here.
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*/
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void power_sleep_until_button(void);
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/**
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* @brief Return the current state of the PTT button.
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* @return true when the button is pressed.
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*/
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bool power_button_pressed(void);
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