kopia lustrzana https://github.com/micropython/micropython
66 wiersze
1.8 KiB
C
66 wiersze
1.8 KiB
C
/*
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* Copyright (c) 2016 Linaro
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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 <zephyr.h>
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#include <drivers/uart.h>
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#include <drivers/console/uart_console.h>
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#include <sys/printk.h>
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#include "zephyr_getchar.h"
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extern int mp_interrupt_char;
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void mp_sched_keyboard_interrupt(void);
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static struct k_sem uart_sem;
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#define UART_BUFSIZE 256
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static uint8_t uart_ringbuf[UART_BUFSIZE];
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static uint8_t i_get, i_put;
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static int console_irq_input_hook(uint8_t ch)
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{
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int i_next = (i_put + 1) & (UART_BUFSIZE - 1);
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if (i_next == i_get) {
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printk("UART buffer overflow - char dropped\n");
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return 1;
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}
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if (ch == mp_interrupt_char) {
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mp_sched_keyboard_interrupt();
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return 1;
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} else {
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uart_ringbuf[i_put] = ch;
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i_put = i_next;
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}
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//printk("%x\n", ch);
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k_sem_give(&uart_sem);
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k_yield();
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return 1;
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}
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uint8_t zephyr_getchar(void) {
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k_sem_take(&uart_sem, K_FOREVER);
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unsigned int key = irq_lock();
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uint8_t c = uart_ringbuf[i_get++];
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i_get &= UART_BUFSIZE - 1;
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irq_unlock(key);
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return c;
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}
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void zephyr_getchar_init(void) {
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k_sem_init(&uart_sem, 0, UINT_MAX);
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uart_console_in_debug_hook_install(console_irq_input_hook);
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// All NULLs because we're interested only in the callback above
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uart_register_input(NULL, NULL, NULL);
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}
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