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* Copyright (c) 2011-2012, 2014-2015 Wind River Systems, Inc.
*
* 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.
*/
/**
* @file
* @brief UART-driven console
*
*
* Serial console driver.
* Hooks into the printk and fputc (for printf) modules. Poll driven.
*/
#include <nanokernel.h>
#include <arch/cpu.h>
#include <stdio.h>
#include <stdint.h>
#include <errno.h>
#include <ctype.h>
#include <device.h>
#include <init.h>
#include <board.h>
#include <uart.h>
#include <console/uart_console.h>
#include <toolchain.h>
#include <sections.h>
#include <atomic.h>
#include <misc/printk.h>
static struct device *uart_console_dev;
#if 0 /* NOTUSED */
/**
*
* @brief Get a character from UART
*
* @return the character or EOF if nothing present
*/
static int console_in(void)
{
unsigned char c;
if (uart_poll_in(uart_console_dev, &c) < 0)
return EOF;
else
return (int)c;
}
#endif
#if defined(CONFIG_PRINTK) || defined(CONFIG_STDOUT_CONSOLE)
/**
*
* @brief Output one character to UART
*
* Outputs both line feed and carriage return in the case of a '\n'.
*
* @param c Character to output
*
* @return The character passed as input.
*/
static int console_out(int c)
{
uart_poll_out(uart_console_dev, (unsigned char)c);
if ('\n' == c) {
uart_poll_out(uart_console_dev, (unsigned char)'\r');
}
return c;
}
#endif
#if defined(CONFIG_STDOUT_CONSOLE)
extern void __stdout_hook_install(int (*hook)(int));
#else
#define __stdout_hook_install(x) \
do {/* nothing */ \
} while ((0))
#endif
#if defined(CONFIG_PRINTK)
extern void __printk_hook_install(int (*fn)(int));
#else
#define __printk_hook_install(x) \
do {/* nothing */ \
} while ((0))
#endif
#if defined(CONFIG_CONSOLE_HANDLER)
static struct nano_fifo *avail_queue;
static struct nano_fifo *lines_queue;
/* Control characters */
#define ESC 0x1b
#define DEL 0x7f
/* ANSI escape sequences */
#define ANSI_ESC '['
#define ANSI_UP 'A'
#define ANSI_DOWN 'B'
#define ANSI_FORWARD 'C'
#define ANSI_BACKWARD 'D'
static int read_uart(struct device *uart, uint8_t *buf, unsigned int size)
{
int rx;
rx = uart_fifo_read(uart, buf, size);
if (rx < 0) {
/* Overrun issue. Stop the UART */
uart_irq_rx_disable(uart);
return -EIO;
}
return rx;
}
static inline void cursor_forward(unsigned int count)
{
printk("\x1b[%uC", count);
}
static inline void cursor_backward(unsigned int count)
{
printk("\x1b[%uD", count);
}
static inline void cursor_save(void)
{
printk("\x1b[s");
}
static inline void cursor_restore(void)
{
printk("\x1b[u");
}
static void insert_char(char *pos, char c, uint8_t end)
{
char tmp;
/* Echo back to console */
uart_poll_out(uart_console_dev, c);
if (end == 0) {
*pos = c;
return;
}
tmp = *pos;
*(pos++) = c;
cursor_save();
while (end-- > 0) {
uart_poll_out(uart_console_dev, tmp);
c = *pos;
*(pos++) = tmp;
tmp = c;
}
/* Move cursor back to right place */
cursor_restore();
}
static void del_char(char *pos, uint8_t end)
{
uart_poll_out(uart_console_dev, '\b');
if (end == 0) {
uart_poll_out(uart_console_dev, ' ');
uart_poll_out(uart_console_dev, '\b');
return;
}
cursor_save();
while (end-- > 0) {
*pos = *(pos + 1);
uart_poll_out(uart_console_dev, *(pos++));
}
uart_poll_out(uart_console_dev, ' ');
/* Move cursor back to right place */
cursor_restore();
}
enum {
ESC_ESC,
ESC_ANSI,
ESC_ANSI_FIRST,
ESC_ANSI_VAL,
ESC_ANSI_VAL_2
};
static atomic_t esc_state;
static unsigned int ansi_val, ansi_val_2;
static uint8_t cur, end;
static void handle_ansi(uint8_t byte)
{
if (atomic_test_and_clear_bit(&esc_state, ESC_ANSI_FIRST)) {
if (!isdigit(byte)) {
ansi_val = 1;
goto ansi_cmd;
}
atomic_set_bit(&esc_state, ESC_ANSI_VAL);
ansi_val = byte - '0';
ansi_val_2 = 0;
return;
}
if (atomic_test_bit(&esc_state, ESC_ANSI_VAL)) {
if (isdigit(byte)) {
if (atomic_test_bit(&esc_state, ESC_ANSI_VAL_2)) {
ansi_val_2 *= 10;
ansi_val_2 += byte - '0';
} else {
ansi_val *= 10;
ansi_val += byte - '0';
}
return;
}
/* Multi value sequence, e.g. Esc[Line;ColumnH */
if (byte == ';' &&
!atomic_test_and_set_bit(&esc_state, ESC_ANSI_VAL_2)) {
return;
}
atomic_clear_bit(&esc_state, ESC_ANSI_VAL);
atomic_clear_bit(&esc_state, ESC_ANSI_VAL_2);
}
ansi_cmd:
switch (byte) {
case ANSI_BACKWARD:
if (ansi_val > cur) {
break;
}
end += ansi_val;
cur -= ansi_val;
cursor_backward(ansi_val);
break;
case ANSI_FORWARD:
if (ansi_val > end) {
break;
}
end -= ansi_val;
cur += ansi_val;
cursor_forward(ansi_val);
break;
default:
break;
}
atomic_clear_bit(&esc_state, ESC_ANSI);
}
void uart_console_isr(struct device *unused)
{
ARG_UNUSED(unused);
while (uart_irq_update(uart_console_dev) &&
uart_irq_is_pending(uart_console_dev)) {
static struct uart_console_input *cmd;
uint8_t byte;
int rx;
if (!uart_irq_rx_ready(uart_console_dev)) {
continue;
}
/* Character(s) have been received */
rx = read_uart(uart_console_dev, &byte, 1);
if (rx < 0) {
return;
}
if (uart_irq_input_hook(uart_console_dev, byte) != 0) {
/*
* The input hook indicates that no further processing
* should be done by this handler.
*/
return;
}
if (!cmd) {
cmd = nano_isr_fifo_get(avail_queue, TICKS_NONE);
if (!cmd)
return;
}
/* Handle ANSI escape mode */
if (atomic_test_bit(&esc_state, ESC_ANSI)) {
handle_ansi(byte);
continue;
}
/* Handle escape mode */
if (atomic_test_and_clear_bit(&esc_state, ESC_ESC)) {
switch (byte) {
case ANSI_ESC:
atomic_set_bit(&esc_state, ESC_ANSI);
atomic_set_bit(&esc_state, ESC_ANSI_FIRST);
break;
default:
break;
}
continue;
}
/* Handle special control characters */
if (!isprint(byte)) {
switch (byte) {
case DEL:
if (cur > 0) {
del_char(&cmd->line[--cur], end);
}
break;
case ESC:
atomic_set_bit(&esc_state, ESC_ESC);
break;
case '\r':
cmd->line[cur + end] = '\0';
uart_poll_out(uart_console_dev, '\r');
uart_poll_out(uart_console_dev, '\n');
cur = 0;
end = 0;
nano_isr_fifo_put(lines_queue, cmd);
cmd = NULL;
break;
default:
break;
}
continue;
}
/* Ignore characters if there's no more buffer space */
if (cur + end < sizeof(cmd->line) - 1) {
insert_char(&cmd->line[cur++], byte, end);
}
}
}
static void console_input_init(void)
{
uint8_t c;
uart_irq_rx_disable(uart_console_dev);
uart_irq_tx_disable(uart_console_dev);
uart_irq_callback_set(uart_console_dev, uart_console_isr);
/* Drain the fifo */
while (uart_irq_rx_ready(uart_console_dev)) {
uart_fifo_read(uart_console_dev, &c, 1);
}
uart_irq_rx_enable(uart_console_dev);
}
void uart_register_input(struct nano_fifo *avail, struct nano_fifo *lines)
{
avail_queue = avail;
lines_queue = lines;
console_input_init();
}
#else
#define console_input_init(x) \
do {/* nothing */ \
} while ((0))
#define uart_register_input(x) \
do {/* nothing */ \
} while ((0))
#endif
/**
*
* @brief Install printk/stdout hook for UART console output
*
* @return N/A
*/
void uart_console_hook_install(void)
{
__stdout_hook_install(console_out);
__printk_hook_install(console_out);
}
/**
*
* @brief Initialize one UART as the console/debug port
*
* @return 0 if successful, otherwise failed.
*/
static int uart_console_init(struct device *arg)
{
ARG_UNUSED(arg);
uart_console_dev = device_get_binding(CONFIG_UART_CONSOLE_ON_DEV_NAME);
uart_console_hook_install();
return 0;
}
/* UART consloe initializes after the UART device itself */
SYS_INIT(uart_console_init,
#if defined(CONFIG_EARLY_CONSOLE)
PRIMARY,
#else
SECONDARY,
#endif
CONFIG_UART_CONSOLE_INIT_PRIORITY);
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