mirror of
https://github.com/zephyrproject-rtos/zephyr
synced 2025-08-26 01:46:26 +00:00
6d27b0a33c
This driver is a very simple UART driver that can be used to implement a protocol in application. It has no protocol logic and just allow application to receive and send data over UART in platform independent manner. API is designed to minimize number of required memory copies. Application is able to provide new buffer every time it decides to consume received data. It is also able to just alter offset and reuse current buffer eg if data was corrupted or otherwise invalid. Change-Id: I8d3827fe2e242196e986d0419bc5487357481558 Signed-off-by: Szymon Janc <szymon.janc@tieto.com>
116 lines
3.2 KiB
C
116 lines
3.2 KiB
C
/*! @file
|
|
* @brief Simple UART driver
|
|
*
|
|
* A simple UART driver allowing application to handle all aspects of received
|
|
* protocol data.
|
|
*/
|
|
|
|
/*
|
|
* Copyright (c) 2015 Intel Corporation
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1) Redistributions of source code must retain the above copyright notice,
|
|
* this list of conditions and the following disclaimer.
|
|
*
|
|
* 2) Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* 3) Neither the name of Intel Corporation nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software without
|
|
* specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <nanokernel.h>
|
|
#include <arch/cpu.h>
|
|
|
|
#include <board.h>
|
|
#include <drivers/uart.h>
|
|
|
|
#include <simple/uart.h>
|
|
#include <misc/printk.h>
|
|
|
|
#define UART CONFIG_UART_SIMPLE_INDEX
|
|
|
|
static uint8_t *recv_buf;
|
|
static size_t recv_buf_len;
|
|
static uart_simple_recv_cb app_cb;
|
|
static size_t recv_off;
|
|
|
|
void uart_simple_isr(void *unused)
|
|
{
|
|
ARG_UNUSED(unused);
|
|
|
|
while (uart_irq_update(UART) && uart_irq_is_pending(UART)) {
|
|
int rx;
|
|
|
|
if (!uart_irq_rx_ready(UART)) {
|
|
continue;
|
|
}
|
|
|
|
rx = uart_fifo_read(UART, 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_simple_send(const uint8_t *data, int len)
|
|
{
|
|
return uart_fifo_fill(UART, data, len);
|
|
}
|
|
|
|
static void uart_simple_setup(int uart, struct uart_init_info *info)
|
|
{
|
|
uart_init(uart, info);
|
|
|
|
uart_irq_rx_disable(uart);
|
|
uart_irq_tx_disable(uart);
|
|
uart_int_connect(uart, uart_simple_isr, NULL, NULL);
|
|
|
|
/* 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_simple_register(uint8_t *buf, size_t len, uart_simple_recv_cb cb)
|
|
{
|
|
struct uart_init_info info = {
|
|
.options = 0,
|
|
.sys_clk_freq = CONFIG_UART_SIMPLE_FREQ,
|
|
.baud_rate = CONFIG_UART_SIMPLE_BAUDRATE,
|
|
.int_pri = CONFIG_UART_SIMPLE_INT_PRI,
|
|
};
|
|
|
|
recv_buf = buf;
|
|
recv_buf_len = len;
|
|
app_cb = cb;
|
|
|
|
uart_simple_setup(UART, &info);
|
|
}
|