uart.h

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/*
 * Copyright (c) 2022 Trackunit Corporation
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#include <zephyr/kernel.h>
#include <zephyr/types.h>
#include <zephyr/device.h>
#include <zephyr/drivers/uart.h>
#include <zephyr/sys/ring_buffer.h>
#include <zephyr/sys/atomic.h>
 
#include <zephyr/modem/pipe.h>
 
#ifndef ZEPHYR_MODEM_BACKEND_UART_
#define ZEPHYR_MODEM_BACKEND_UART_
 
#ifdef __cplusplus
extern "C" {
#endif
 
struct modem_backend_uart_isr {
        struct ring_buf receive_rdb[2];
        struct ring_buf transmit_rb;
        atomic_t transmit_buf_len;
        uint8_t receive_rdb_used;
        uint32_t transmit_buf_put_limit;
};
 
struct modem_backend_uart_async {
        uint8_t *receive_bufs[2];
        uint32_t receive_buf_size;
        struct ring_buf receive_rb;
        struct k_spinlock receive_rb_lock;
        uint8_t *transmit_buf;
        uint32_t transmit_buf_size;
        struct k_work rx_disabled_work;
        atomic_t state;
};
 
struct modem_backend_uart {
        const struct device *uart;
        struct modem_pipe pipe;
        struct k_work receive_ready_work;
        struct k_work transmit_idle_work;
 
        union {
                struct modem_backend_uart_isr isr;
                struct modem_backend_uart_async async;
        };
};
 
struct modem_backend_uart_config {
        const struct device *uart;
        uint8_t *receive_buf;
        uint32_t receive_buf_size;
        uint8_t *transmit_buf;
        uint32_t transmit_buf_size;
};
 
struct modem_pipe *modem_backend_uart_init(struct modem_backend_uart *backend,
                                           const struct modem_backend_uart_config *config);
 
#ifdef __cplusplus
}
#endif
 
#endif /* ZEPHYR_MODEM_BACKEND_UART_ */