eeec6088aa
This patch extends the uart sample so the same functionality (write buffer, read char then write buffer again) is implemented using irq-based APIs. Change-Id: Iefb14dae2b253f90da64ccef8c123619ed494aca Signed-off-by: Andre Guedes <andre.guedes@intel.com>
122 lines
2.7 KiB
C
122 lines
2.7 KiB
C
/*
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* Copyright (c) 2016 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 <string.h>
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#include <device.h>
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#include <uart.h>
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#include <zephyr.h>
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static const char *banner1 = "Send any character to the UART device\n";
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static const char *banner2 = "Character read:\n";
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#ifdef CONFIG_BOARD_QUARK_SE_DEVBOARD
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#define UART_DEVICE "UART_1"
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#elif CONFIG_BOARD_QUARK_D2000_CRB
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#define UART_DEVICE "UART_0"
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#else
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/* For any other board not specified above, we use UART_0 by default. */
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#define UART_DEVICE "UART_0"
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#endif
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static volatile bool data_transmitted;
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static volatile bool data_arrived;
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static char new_data;
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static void write_string(struct device *dev, const char *str, int len)
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{
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for (int i = 0; i < len; i++)
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uart_poll_out(dev, str[i]);
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}
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static void test_by_polling(struct device *dev)
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{
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unsigned char data;
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write_string(dev, banner1, strlen(banner1));
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/* Poll in the character */
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while (uart_poll_in(dev, &data) == -1)
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;
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write_string(dev, banner2, strlen(banner2));
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write_string(dev, &data, 1);
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write_string(dev, "\n", 1);
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}
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static void interrupt_handler(struct device *dev)
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{
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uart_irq_update(dev);
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if (uart_irq_tx_ready(dev)) {
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data_transmitted = true;
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}
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if (uart_irq_rx_ready(dev)) {
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uart_fifo_read(dev, &new_data, 1);
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data_arrived = true;
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}
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}
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static void read_char_irq(struct device *dev, char *data)
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{
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uart_irq_rx_enable(dev);
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data_arrived = false;
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while (data_arrived == false)
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;
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*data = new_data;
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uart_irq_rx_disable(dev);
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}
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static void write_buf_irq(struct device *dev, const char *buf, int len)
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{
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int i;
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uart_irq_tx_enable(dev);
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for (i = 0; i < len; i++) {
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data_transmitted = false;
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uart_fifo_fill(dev, &buf[i], 1);
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while (data_transmitted == false)
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;
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}
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uart_irq_tx_disable(dev);
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}
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static void test_by_irq(struct device *dev)
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{
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char data;
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uart_irq_callback_set(dev, interrupt_handler);
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write_buf_irq(dev, banner1, strlen(banner1));
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read_char_irq(dev, &data);
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write_buf_irq(dev, banner2, strlen(banner2));
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write_buf_irq(dev, &data, sizeof(data));
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write_buf_irq(dev, "\n", 1);
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}
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void main(void)
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{
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struct device *dev = device_get_binding(UART_DEVICE);
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test_by_polling(dev);
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test_by_irq(dev);
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}
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