unleashed-firmware/firmware/targets/furi-hal-include/furi-hal-irda.h

#pragma once
#include <stdint.h>
#include <stdbool.h>
#include <stddef.h>

#ifdef __cplusplus
extern "C" {
#endif

#define IRDA_MAX_FREQUENCY      56000
#define IRDA_MIN_FREQUENCY      10000

typedef enum {
    FuriHalIrdaTxGetDataStateOk,         /* New data obtained */
    FuriHalIrdaTxGetDataStateDone,       /* New data obtained, and this is end of package */
    FuriHalIrdaTxGetDataStateLastDone,   /* New data obtained, and this is end of package and no more data available */
} FuriHalIrdaTxGetDataState;

/* Callback type for providing data to IRDA DMA TX system. It is called every tim */
typedef FuriHalIrdaTxGetDataState (*FuriHalIrdaTxGetDataISRCallback) (void* context, uint32_t* duration, bool* level);

/* Callback type called every time signal is sent by DMA to Timer.
 * Actually, it means there are 2 timings left to send for this signal, which is almost end.
 * Don't use this callback to stop transmission, as far as there are next signal is
 * charged for transmission by DMA.
 */
typedef void (*FuriHalIrdaTxSignalSentISRCallback) (void* context);

/**
 * Signature of callback function for receiving continuous IRDA rx signal.
 *
 * @param   ctx[in] - context to pass to callback
 * @param   level[in] - level of input IRDA rx signal
 * @param   duration[in] - duration of continuous rx signal level in us
 */
typedef void (*FuriHalIrdaRxCaptureCallback)(void* ctx, bool level, uint32_t duration);

/**
 * Signature of callback function for reaching silence timeout on IRDA port.
 *
 * @param   ctx[in] - context to pass to callback
 */
typedef void (*FuriHalIrdaRxTimeoutCallback)(void* ctx);

/**
 * Initialize IRDA RX timer to receive interrupts.
 * It provides interrupts for every RX-signal edge changing
 * with its duration.
 */
void furi_hal_irda_async_rx_start(void);

/**
 * Deinitialize IRDA RX interrupt.
 */
void furi_hal_irda_async_rx_stop(void);

/** Setup hal for receiving silence timeout.
 * Should be used with 'furi_hal_irda_timeout_irq_set_callback()'.
 *
 * @param[in]   timeout_us - time to wait for silence on IRDA port
 *                           before generating IRQ.
 */
void furi_hal_irda_async_rx_set_timeout(uint32_t timeout_us);

/** Setup callback for previously initialized IRDA RX interrupt.
 *
 * @param[in]   callback - callback to call when RX signal edge changing occurs
 * @param[in]   ctx - context for callback
 */
void furi_hal_irda_async_rx_set_capture_isr_callback(FuriHalIrdaRxCaptureCallback callback, void *ctx);

/**
 * Setup callback for reaching silence timeout on IRDA port.
 * Should setup hal with 'furi_hal_irda_setup_rx_timeout_irq()' first.
 *
 * @param[in]   callback - callback for silence timeout
 * @param[in]   ctx - context to pass to callback
 */
void furi_hal_irda_async_rx_set_timeout_isr_callback(FuriHalIrdaRxTimeoutCallback callback, void *ctx);

/**
 * Check if IRDA is in use now.
 * @return  true - IRDA is busy, false otherwise.
 */
bool furi_hal_irda_is_busy(void);

/**
 * Set callback providing new data. This function has to be called
 * before furi_hal_irda_async_tx_start().
 *
 * @param[in]   callback - function to provide new data
 * @param[in]   context - context for callback
 */
void furi_hal_irda_async_tx_set_data_isr_callback(FuriHalIrdaTxGetDataISRCallback callback, void* context);

/**
 * Start IR asynchronous transmission. It can be stopped by 2 reasons:
 * 1) implicit call for furi_hal_irda_async_tx_stop()
 * 2) callback can provide FuriHalIrdaTxGetDataStateLastDone response
 *      which means no more data available for transmission.
 *
 * Any func (furi_hal_irda_async_tx_stop() or
 * furi_hal_irda_async_tx_wait_termination()) has to be called to wait
 * end of transmission and free resources.
 *
 * @param[in]   freq - frequency for PWM
 * @param[in]   duty_cycle - duty cycle for PWM
 */
void furi_hal_irda_async_tx_start(uint32_t freq, float duty_cycle);

/**
 * Stop IR asynchronous transmission and free resources.
 * Transmission will stop as soon as transmission reaches end of
 * package (FuriHalIrdaTxGetDataStateDone or FuriHalIrdaTxGetDataStateLastDone).
 */
void furi_hal_irda_async_tx_stop(void);

/**
 * Wait for end of IR asynchronous transmission and free resources.
 * Transmission will stop as soon as transmission reaches end of
 * transmission (FuriHalIrdaTxGetDataStateLastDone).
 */
void furi_hal_irda_async_tx_wait_termination(void);

/**
 * Set callback for end of signal transmission
 *
 * @param[in]   callback - function to call when signal is sent
 * @param[in]   context - context for callback
 */
void furi_hal_irda_async_tx_set_signal_sent_isr_callback(FuriHalIrdaTxSignalSentISRCallback callback, void* context);

#ifdef __cplusplus
}
#endif