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/** @file
* @brief Pipe UART driver
*
* A pipe UART driver allowing application to handle all aspects of received
* protocol data.
*/
/*
* Copyright (c) 2015 Intel Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <nanokernel.h>
#include <board.h>
#include <uart.h>
#include <console/uart_pipe.h>
#include <misc/printk.h>
static struct device *uart_pipe_dev;
static uint8_t *recv_buf;
static size_t recv_buf_len;
static uart_pipe_recv_cb app_cb;
static size_t recv_off;
void uart_pipe_isr(void *unused)
{
ARG_UNUSED(unused);
while (uart_irq_update(uart_pipe_dev)
&& uart_irq_is_pending(uart_pipe_dev)) {
int rx;
if (!uart_irq_rx_ready(uart_pipe_dev)) {
continue;
}
rx = uart_fifo_read(uart_pipe_dev, recv_buf + recv_off,
recv_buf_len - recv_off);
if (!rx) {
continue;
}
/*
* Call application callback with received data. Application
* may provide new buffer or alter data offset.
*/
recv_off += rx;
recv_buf = app_cb(recv_buf, &recv_off);
}
}
int uart_pipe_send(const uint8_t *data, int len)
{
if (uart_pipe_dev != NULL) {
return uart_fifo_fill(uart_pipe_dev, data, len);
} else {
return 0;
}
}
IRQ_CONNECT_STATIC(uart_pipe, CONFIG_UART_PIPE_IRQ,
CONFIG_UART_PIPE_IRQ_PRI, uart_pipe_isr, 0,
UART_IRQ_FLAGS);
static void uart_pipe_setup(struct device *uart)
{
uart_irq_rx_disable(uart);
uart_irq_tx_disable(uart);
IRQ_CONFIG(uart_pipe, uart_irq_get(uart));
irq_enable(uart_irq_get(uart));
/* Drain the fifo */
while (uart_irq_rx_ready(uart)) {
unsigned char c;
uart_fifo_read(uart, &c, 1);
}
uart_irq_rx_enable(uart);
}
void uart_pipe_register(uint8_t *buf, size_t len, uart_pipe_recv_cb cb)
{
recv_buf = buf;
recv_buf_len = len;
app_cb = cb;
uart_pipe_dev = device_get_binding(CONFIG_UART_PIPE_ON_DEV_NAME);
if (uart_pipe_dev != NULL) {
uart_pipe_setup(uart_pipe_dev);
}
}
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