109 lines
2.0 KiB
C
109 lines
2.0 KiB
C
/** @file
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* @brief Pipe UART driver
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*
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* A pipe UART driver allowing application to handle all aspects of received
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* protocol data.
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*/
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/*
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* Copyright (c) 2015 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <logging/log.h>
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LOG_MODULE_REGISTER(uart_pipe, CONFIG_UART_CONSOLE_LOG_LEVEL);
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#include <kernel.h>
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#include <drivers/uart.h>
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#include <drivers/console/uart_pipe.h>
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#include <sys/printk.h>
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static const struct device *uart_pipe_dev;
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static uint8_t *recv_buf;
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static size_t recv_buf_len;
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static uart_pipe_recv_cb app_cb;
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static size_t recv_off;
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static void uart_pipe_rx(const struct device *dev)
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{
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/* As per the API, the interrupt may be an edge so keep
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* reading from the FIFO until it's empty.
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*/
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for (;;) {
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int avail = recv_buf_len - recv_off;
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int got;
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got = uart_fifo_read(uart_pipe_dev, recv_buf + recv_off, avail);
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if (got <= 0) {
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break;
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}
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LOG_HEXDUMP_DBG(recv_buf + recv_off, got, "RX");
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/*
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* Call application callback with received data. Application
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* may provide new buffer or alter data offset.
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*/
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recv_off += got;
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recv_buf = app_cb(recv_buf, &recv_off);
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}
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}
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static void uart_pipe_isr(const struct device *dev, void *user_data)
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{
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ARG_UNUSED(user_data);
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uart_irq_update(dev);
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if (uart_irq_is_pending(dev)) {
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if (uart_irq_rx_ready(dev)) {
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uart_pipe_rx(dev);
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}
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}
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}
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int uart_pipe_send(const uint8_t *data, int len)
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{
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LOG_HEXDUMP_DBG(data, len, "TX");
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while (len--) {
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uart_poll_out(uart_pipe_dev, *data++);
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}
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return 0;
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}
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static void uart_pipe_setup(const struct device *uart)
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{
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uint8_t c;
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uart_irq_rx_disable(uart);
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uart_irq_tx_disable(uart);
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/* Drain the fifo */
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while (uart_fifo_read(uart, &c, 1)) {
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continue;
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}
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uart_irq_callback_set(uart, uart_pipe_isr);
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uart_irq_rx_enable(uart);
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}
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void uart_pipe_register(uint8_t *buf, size_t len, uart_pipe_recv_cb cb)
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{
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recv_buf = buf;
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recv_buf_len = len;
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app_cb = cb;
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uart_pipe_dev = device_get_binding(CONFIG_UART_PIPE_ON_DEV_NAME);
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if (uart_pipe_dev != NULL) {
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uart_pipe_setup(uart_pipe_dev);
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}
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}
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