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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2015 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "us_ticker_api.h"
#include "wait_api.h"
#include "MicroBitSystemTimer.h"
#include "MicroBitSerial.h"
extern "C" {
#include "py/runtime.h"
#include "py/mphal.h"
#include "lib/utils/interrupt_char.h"
#include "microbit/modmicrobit.h"
#define UART_RX_BUF_SIZE (64) // it's large so we can paste example code
static uint8_t uart_rx_buf[UART_RX_BUF_SIZE];
static volatile uint16_t uart_rx_buf_head, uart_rx_buf_tail;
MicroBitSerial ubit_serial(USBTX, USBRX);
void uart_rx_irq(void) {
if (!ubit_serial.readable()) {
return;
}
int c = ubit_serial.getc();
if (c == mp_interrupt_char) {
mp_keyboard_interrupt();
} else {
uint16_t next_head = (uart_rx_buf_head + 1) % UART_RX_BUF_SIZE;
if (next_head != uart_rx_buf_tail) {
// only store data if room in buf
uart_rx_buf[uart_rx_buf_head] = c;
uart_rx_buf_head = next_head;
}
}
}
void mp_hal_init(void) {
uart_rx_buf_head = 0;
uart_rx_buf_tail = 0;
ubit_serial.attach(uart_rx_irq);
}
int mp_hal_stdin_rx_any(void) {
return uart_rx_buf_tail != uart_rx_buf_head;
}
int mp_hal_stdin_rx_chr(void) {
while (uart_rx_buf_tail == uart_rx_buf_head) {
__WFI();
}
int c = uart_rx_buf[uart_rx_buf_tail];
uart_rx_buf_tail = (uart_rx_buf_tail + 1) % UART_RX_BUF_SIZE;
return c;
}
void mp_hal_stdout_tx_str(const char *str) {
mp_hal_stdout_tx_strn(str, strlen(str));
}
void mp_hal_stdout_tx_strn(const char *str, size_t len) {
for (; len > 0; --len) {
ubit_serial.putc(*str++);
}
}
void mp_hal_stdout_tx_strn_cooked(const char *str, size_t len) {
for (; len > 0; --len) {
if (*str == '\n') {
ubit_serial.putc('\r');
}
ubit_serial.putc(*str++);
}
}
STATIC void mp_hal_print_many(const char chrs[8], unsigned int total) {
while (total > 0) {
unsigned int n = total;
if (n > 8) {
n = 8;
}
total -= n;
mp_hal_stdout_tx_strn(chrs, n);
}
}
void mp_hal_move_cursor_back(unsigned int pos) {
mp_hal_print_many("\b\b\b\b\b\b\b\b", pos);
}
void mp_hal_erase_line_from_cursor(unsigned int n_chars) {
mp_hal_print_many(" ", n_chars);
mp_hal_move_cursor_back(n_chars);
}
void mp_hal_display_string(const char *str) {
microbit_display_scroll(µbit_display_obj, str);
}
void mp_hal_delay_us(mp_uint_t us) {
wait_us(us);
}
void mp_hal_delay_ms(mp_uint_t ms) {
if (ms <= 0) {
return;
}
// Wraparound of tick is taken care of by 2's complement arithmetic
uint64_t start = system_timer_current_time();
while (system_timer_current_time() - start < (uint64_t)ms) {
// Check for any pending events, like a KeyboardInterrupt
mp_handle_pending();
// Enter sleep mode, waiting for (at least) the SysTick interrupt
__WFI();
}
}
mp_uint_t mp_hal_ticks_us(void) {
return us_ticker_read();
}
mp_uint_t mp_hal_ticks_ms(void) {
return system_timer_current_time();
}
}
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