u_blox_spi.h

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/*
 * Copyright (c) 2024 Embeint Holdings Pty Ltd
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/drivers/i2c.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/sys/ring_buffer.h>
 
#include <zephyr/modem/pipe.h>
 
#ifndef INFUSE_MODEM_BACKEND_U_BLOX_SPI_
#define INFUSE_MODEM_BACKEND_U_BLOX_SPI_
 
#ifdef __cplusplus
extern "C" {
#endif
 
struct modem_backend_ublox_spi {
        /* Pointer to SPI configuration */
        const struct spi_dt_spec *spi;
        /* Pointer to data ready pin configuration */
        const struct gpio_dt_spec *data_ready;
        /* Communication pipe */
        struct modem_pipe pipe;
        /* Ring buffer for holding pipe data stream */
        struct ring_buf pipe_ring_buf;
        /* Worker that reads the FIFO */
        struct k_work_delayable fifo_read;
        /* Signal to notify when FIFO read completes */
        struct k_poll_signal read_result;
        /* Callback for data ready GPIO */
        struct gpio_callback data_ready_cb;
        /* Bus contention semaphore */
        struct k_sem bus_sem;
        /* Duration between polls */
        k_timeout_t poll_period;
        /* Number of bytes pending on FIFO */
        uint16_t bytes_pending;
        /* Internal state flags */
        uint8_t flags;
        /* Backing memory for pipe data stream */
        uint8_t pipe_memory[CONFIG_GNSS_U_BLOX_PIPE_SIZE];
        /* Temporary RX buffer */
        uint8_t spi_rx[70];
};
 
struct modem_backend_ublox_spi_config {
        /* Bus to use */
        const struct spi_dt_spec *spi;
        /* GPIO that will transition to active when data is ready after @ref
         * modem_backend_ublox_spi_use_data_ready_gpio
         */
        const struct gpio_dt_spec *data_ready;
        /* Period to poll for data before @ref modem_backend_ublox_spi_use_data_ready_gpio */
        k_timeout_t poll_period;
};
 
struct modem_pipe *
modem_backend_ublox_spi_init(struct modem_backend_ublox_spi *backend,
                             const struct modem_backend_ublox_spi_config *config);
 
void modem_backend_ublox_spi_use_data_ready_gpio(struct modem_backend_ublox_spi *backend);
 
#ifdef __cplusplus
}
#endif
 
#endif /* INFUSE_MODEM_BACKEND_U_BLOX_SPI_ */