102 lines
2.3 KiB
C
102 lines
2.3 KiB
C
/*
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* Copyright Runtime.io 2018. All rights reserved.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/** @file
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* @brief UART transport for the mcumgr SMP protocol.
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*/
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#include <string.h>
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#include <zephyr.h>
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#include <init.h>
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#include "net/buf.h"
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#include <drivers/console/uart_mcumgr.h>
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#include "mgmt/mgmt.h"
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#include <mgmt/mcumgr/serial.h>
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#include "mgmt/mcumgr/buf.h"
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#include "mgmt/mcumgr/smp.h"
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struct device;
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static void smp_uart_process_rx_queue(struct k_work *work);
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K_FIFO_DEFINE(smp_uart_rx_fifo);
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K_WORK_DEFINE(smp_uart_work, smp_uart_process_rx_queue);
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static struct mcumgr_serial_rx_ctxt smp_uart_rx_ctxt;
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static struct zephyr_smp_transport smp_uart_transport;
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/**
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* Processes a single line (fragment) coming from the mcumgr UART driver.
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*/
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static void smp_uart_process_frag(struct uart_mcumgr_rx_buf *rx_buf)
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{
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struct net_buf *nb;
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/* Decode the fragment and write the result to the global receive
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* context.
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*/
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nb = mcumgr_serial_process_frag(&smp_uart_rx_ctxt,
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rx_buf->data, rx_buf->length);
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/* Release the encoded fragment. */
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uart_mcumgr_free_rx_buf(rx_buf);
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/* If a complete packet has been received, pass it to SMP for
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* processing.
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*/
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if (nb != NULL) {
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zephyr_smp_rx_req(&smp_uart_transport, nb);
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}
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}
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static void smp_uart_process_rx_queue(struct k_work *work)
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{
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struct uart_mcumgr_rx_buf *rx_buf;
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while ((rx_buf = k_fifo_get(&smp_uart_rx_fifo, K_NO_WAIT)) != NULL) {
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smp_uart_process_frag(rx_buf);
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}
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}
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/**
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* Enqueues a received SMP fragment for later processing. This function
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* executes in the interrupt context.
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*/
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static void smp_uart_rx_frag(struct uart_mcumgr_rx_buf *rx_buf)
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{
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k_fifo_put(&smp_uart_rx_fifo, rx_buf);
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k_work_submit(&smp_uart_work);
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}
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static uint16_t smp_uart_get_mtu(const struct net_buf *nb)
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{
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return CONFIG_MCUMGR_SMP_UART_MTU;
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}
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static int smp_uart_tx_pkt(struct zephyr_smp_transport *zst,
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struct net_buf *nb)
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{
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int rc;
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rc = uart_mcumgr_send(nb->data, nb->len);
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mcumgr_buf_free(nb);
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return rc;
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}
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static int smp_uart_init(const struct device *dev)
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{
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ARG_UNUSED(dev);
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zephyr_smp_transport_init(&smp_uart_transport, smp_uart_tx_pkt,
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smp_uart_get_mtu, NULL, NULL);
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uart_mcumgr_register(smp_uart_rx_frag);
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return 0;
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}
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SYS_INIT(smp_uart_init, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY);
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