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/*
* Copyright (c) 2016 Linaro
*
* 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 <zephyr/kernel.h>
#include <zephyr/drivers/uart.h>
#include <zephyr/drivers/console/uart_console.h>
#include <zephyr/sys/printk.h>
#include "zephyr_getchar.h"
extern int mp_interrupt_char;
void mp_sched_keyboard_interrupt(void);
void mp_hal_signal_event(void);
#define UART_BUFSIZE (512)
static uint8_t uart_ringbuf[UART_BUFSIZE];
static uint16_t i_get, i_put;
static int console_irq_input_hook(uint8_t ch) {
int i_next = (i_put + 1) & (UART_BUFSIZE - 1);
if (i_next == i_get) {
printk("UART buffer overflow - char dropped\n");
return 1;
}
if (ch == mp_interrupt_char) {
mp_hal_signal_event();
mp_sched_keyboard_interrupt();
return 1;
} else {
uart_ringbuf[i_put] = ch;
i_put = i_next;
}
return 1;
}
// Returns true if a char is available for reading.
int zephyr_getchar_check(void) {
return i_get != i_put;
}
int zephyr_getchar(void) {
if (i_get != i_put) {
unsigned int key = irq_lock();
int c = (int)uart_ringbuf[i_get++];
i_get &= UART_BUFSIZE - 1;
irq_unlock(key);
return c;
}
return -1;
}
void zephyr_getchar_init(void) {
uart_console_in_debug_hook_install(console_irq_input_hook);
// All NULLs because we're interested only in the callback above
uart_register_input(NULL, NULL, NULL);
}
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