120 lines
3.3 KiB
C
120 lines
3.3 KiB
C
/*! @file
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* @brief Simple UART driver
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*
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* A simple 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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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2) Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3) Neither the name of Intel Corporation nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <nanokernel.h>
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#include <arch/cpu.h>
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#include <board.h>
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#include <drivers/uart.h>
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#include <simple/uart.h>
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#include <misc/printk.h>
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#define UART CONFIG_UART_SIMPLE_INDEX
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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_simple_recv_cb app_cb;
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static size_t recv_off;
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void uart_simple_isr(void *unused)
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{
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ARG_UNUSED(unused);
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while (uart_irq_update(UART) && uart_irq_is_pending(UART)) {
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int rx;
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if (!uart_irq_rx_ready(UART)) {
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continue;
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}
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rx = uart_fifo_read(UART, 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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/* 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_simple_send(const uint8_t *data, int len)
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{
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return uart_fifo_fill(UART, data, len);
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}
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IRQ_CONNECT_STATIC(uart_simple, CONFIG_UART_SIMPLE_IRQ,
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CONFIG_UART_SIMPLE_INT_PRI, uart_simple_isr, 0);
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static void uart_simple_setup(int uart, struct uart_init_info *info)
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{
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uart_init(uart, info);
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uart_irq_rx_disable(uart);
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uart_irq_tx_disable(uart);
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IRQ_CONFIG(uart_simple, uart_irq_get(uart));
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irq_enable(uart_irq_get(uart));
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/* Drain the fifo */
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while (uart_irq_rx_ready(uart)) {
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unsigned char c;
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uart_fifo_read(uart, &c, 1);
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}
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uart_irq_rx_enable(uart);
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}
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void uart_simple_register(uint8_t *buf, size_t len, uart_simple_recv_cb cb)
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{
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struct uart_init_info info = {
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.options = 0,
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.sys_clk_freq = CONFIG_UART_SIMPLE_FREQ,
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.baud_rate = CONFIG_UART_SIMPLE_BAUDRATE,
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.int_pri = CONFIG_UART_SIMPLE_INT_PRI,
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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_simple_setup(UART, &info);
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}
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