| /* |
| * Copyright (c) 2016 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 <string.h> |
| |
| #include <device.h> |
| #include <uart.h> |
| #include <zephyr.h> |
| |
| static const char *banner1 = "Send any character to the UART device\n"; |
| static const char *banner2 = "Character read:\n"; |
| |
| #ifdef CONFIG_BOARD_QUARK_SE_DEVBOARD |
| #define UART_DEVICE "UART_1" |
| #elif CONFIG_BOARD_QUARK_D2000_CRB |
| #define UART_DEVICE "UART_0" |
| #else |
| /* For any other board not specified above, we use UART_0 by default. */ |
| #define UART_DEVICE "UART_0" |
| #endif |
| |
| static volatile bool data_transmitted; |
| static volatile bool data_arrived; |
| static char new_data; |
| |
| static void write_string(struct device *dev, const char *str, int len) |
| { |
| for (int i = 0; i < len; i++) |
| uart_poll_out(dev, str[i]); |
| } |
| |
| static void test_by_polling(struct device *dev) |
| { |
| unsigned char data; |
| |
| write_string(dev, banner1, strlen(banner1)); |
| |
| /* Poll in the character */ |
| while (uart_poll_in(dev, &data) == -1) |
| ; |
| |
| write_string(dev, banner2, strlen(banner2)); |
| write_string(dev, &data, 1); |
| write_string(dev, "\n", 1); |
| } |
| |
| static void interrupt_handler(struct device *dev) |
| { |
| uart_irq_update(dev); |
| |
| if (uart_irq_tx_ready(dev)) { |
| data_transmitted = true; |
| } |
| |
| if (uart_irq_rx_ready(dev)) { |
| uart_fifo_read(dev, &new_data, 1); |
| data_arrived = true; |
| } |
| } |
| |
| static void read_char_irq(struct device *dev, char *data) |
| { |
| uart_irq_rx_enable(dev); |
| |
| data_arrived = false; |
| while (data_arrived == false) |
| ; |
| *data = new_data; |
| |
| uart_irq_rx_disable(dev); |
| } |
| |
| static void write_buf_irq(struct device *dev, const char *buf, int len) |
| { |
| int i; |
| |
| uart_irq_tx_enable(dev); |
| |
| for (i = 0; i < len; i++) { |
| data_transmitted = false; |
| while (uart_fifo_fill(dev, &buf[i], 1) == 0) |
| ; |
| while (data_transmitted == false) |
| ; |
| } |
| |
| uart_irq_tx_disable(dev); |
| } |
| |
| static void test_by_irq(struct device *dev) |
| { |
| char data; |
| |
| uart_irq_callback_set(dev, interrupt_handler); |
| |
| write_buf_irq(dev, banner1, strlen(banner1)); |
| read_char_irq(dev, &data); |
| write_buf_irq(dev, banner2, strlen(banner2)); |
| write_buf_irq(dev, &data, sizeof(data)); |
| write_buf_irq(dev, "\n", 1); |
| } |
| |
| void main(void) |
| { |
| struct device *dev = device_get_binding(UART_DEVICE); |
| |
| test_by_polling(dev); |
| test_by_irq(dev); |
| } |