1 /* 2 * Copyright (c) 2022 Trackunit Corporation 3 * 4 * SPDX-License-Identifier: Apache-2.0 5 */ 6 7 #include <zephyr/kernel.h> 8 #include <zephyr/types.h> 9 #include <zephyr/device.h> 10 #include <zephyr/drivers/uart.h> 11 #include <zephyr/sys/ring_buffer.h> 12 #include <zephyr/sys/atomic.h> 13 14 #include <zephyr/modem/pipe.h> 15 16 #ifndef ZEPHYR_MODEM_BACKEND_UART_ 17 #define ZEPHYR_MODEM_BACKEND_UART_ 18 19 #ifdef __cplusplus 20 extern "C" { 21 #endif 22 23 struct modem_backend_uart_isr { 24 struct ring_buf receive_rdb[2]; 25 struct ring_buf transmit_rb; 26 atomic_t transmit_buf_len; 27 uint8_t receive_rdb_used; 28 uint32_t transmit_buf_put_limit; 29 }; 30 31 struct modem_backend_uart_async { 32 uint8_t *receive_bufs[2]; 33 uint32_t receive_buf_size; 34 struct ring_buf receive_rb; 35 struct k_spinlock receive_rb_lock; 36 uint8_t *transmit_buf; 37 uint32_t transmit_buf_size; 38 struct k_work rx_disabled_work; 39 atomic_t state; 40 }; 41 42 struct modem_backend_uart { 43 const struct device *uart; 44 struct modem_pipe pipe; 45 struct k_work receive_ready_work; 46 struct k_work transmit_idle_work; 47 48 union { 49 struct modem_backend_uart_isr isr; 50 struct modem_backend_uart_async async; 51 }; 52 }; 53 54 struct modem_backend_uart_config { 55 const struct device *uart; 56 uint8_t *receive_buf; 57 uint32_t receive_buf_size; 58 uint8_t *transmit_buf; 59 uint32_t transmit_buf_size; 60 }; 61 62 struct modem_pipe *modem_backend_uart_init(struct modem_backend_uart *backend, 63 const struct modem_backend_uart_config *config); 64 65 #ifdef __cplusplus 66 } 67 #endif 68 69 #endif /* ZEPHYR_MODEM_BACKEND_UART_ */ 70
