104 lines
2.2 KiB
C
104 lines
2.2 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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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <nanokernel.h>
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#include <board.h>
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#include <uart.h>
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#include <console/uart_pipe.h>
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#include <misc/printk.h>
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static 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_isr(struct device *unused)
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{
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ARG_UNUSED(unused);
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while (uart_irq_update(uart_pipe_dev)
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&& uart_irq_is_pending(uart_pipe_dev)) {
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int rx;
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if (!uart_irq_rx_ready(uart_pipe_dev)) {
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continue;
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}
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rx = uart_fifo_read(uart_pipe_dev, recv_buf + recv_off,
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recv_buf_len - recv_off);
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if (!rx) {
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continue;
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}
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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 += rx;
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recv_buf = app_cb(recv_buf, &recv_off);
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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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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(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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