micropython/ports/alif/mphalport.c

/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2023 Damien P. George
 * Copyright (c) 2024 OpenMV LLC.
 *
 * 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 "py/mphal.h"
#include "py/ringbuf.h"
#include "py/runtime.h"
#include "py/stream.h"
#include "extmod/misc.h"
#include "shared/runtime/interrupt_char.h"
#include "shared/runtime/softtimer.h"
#include "shared/timeutils/timeutils.h"
#include "shared/tinyusb/mp_usbd.h"
#include "shared/tinyusb/mp_usbd_cdc.h"
#include "tusb.h"
#include "mpuart.h"
#include "pendsv.h"
#include "system_tick.h"

#ifndef MICROPY_HW_STDIN_BUFFER_LEN
#define MICROPY_HW_STDIN_BUFFER_LEN 512
#endif

static uint8_t stdin_ringbuf_array[MICROPY_HW_STDIN_BUFFER_LEN];
ringbuf_t stdin_ringbuf = { stdin_ringbuf_array, sizeof(stdin_ringbuf_array) };

uintptr_t mp_hal_stdio_poll(uintptr_t poll_flags) {
    uintptr_t ret = 0;
    #if MICROPY_HW_USB_CDC
    ret |= mp_usbd_cdc_poll_interfaces(poll_flags);
    #endif
    #if MICROPY_HW_ENABLE_UART_REPL
    if (poll_flags & MP_STREAM_POLL_WR) {
        ret |= MP_STREAM_POLL_WR;
    }
    #endif
    #if MICROPY_PY_OS_DUPTERM
    ret |= mp_os_dupterm_poll(poll_flags);
    #endif
    return ret;
}

// Receive single character
int mp_hal_stdin_rx_chr(void) {
    for (;;) {
        #if MICROPY_HW_USB_CDC
        mp_usbd_cdc_poll_interfaces(0);
        #endif
        int c = ringbuf_get(&stdin_ringbuf);
        if (c != -1) {
            return c;
        }
        #if MICROPY_PY_OS_DUPTERM
        int dupterm_c = mp_os_dupterm_rx_chr();
        if (dupterm_c >= 0) {
            return dupterm_c;
        }
        #endif
        mp_event_wait_indefinite();
    }
}

// Send string of given length
mp_uint_t mp_hal_stdout_tx_strn(const char *str, size_t len) {
    #if MICROPY_HW_ENABLE_UART_REPL || MICROPY_HW_USB_CDC || MICROPY_PY_OS_DUPTERM
    mp_uint_t ret = len;
    bool did_write = false;
    #endif

    #if MICROPY_HW_ENABLE_UART_REPL
    mp_uart_write_strn(str, len);
    did_write = true;
    #endif

    #if MICROPY_HW_USB_CDC
    mp_uint_t cdc_res = mp_usbd_cdc_tx_strn(str, len);
    if (cdc_res > 0) {
        did_write = true;
        ret = MIN(cdc_res, ret);
    }
    #endif

    #if MICROPY_PY_OS_DUPTERM
    int dupterm_res = mp_os_dupterm_tx_strn(str, len);
    if (dupterm_res >= 0) {
        did_write = true;
        ret = MIN((mp_uint_t)dupterm_res, ret);
    }
    #endif

    return did_write ? ret : 0;
}

mp_uint_t mp_hal_ticks_cpu(void) {
    return system_tick_get_u32();
}

mp_uint_t mp_hal_ticks_us(void) {
    // Convert system tick to microsecond counter.
    return system_tick_get_u64() / system_core_clock_mhz;
}

mp_uint_t mp_hal_ticks_ms(void) {
    // Convert system tick to millisecond counter.
    return system_tick_get_u64() / (SystemCoreClock / 1000);
}

void mp_hal_delay_us(mp_uint_t us) {
    uint64_t ticks_delay = (uint64_t)us * system_core_clock_mhz;
    uint64_t start = system_tick_get_u64();
    while (system_tick_get_u64() - start < ticks_delay) {
    }
}

void mp_hal_delay_ms(mp_uint_t ms) {
    uint32_t t0 = mp_hal_ticks_ms();
    mp_event_handle_nowait();
    for (;;) {
        uint32_t t1 = mp_hal_ticks_ms();
        if (t1 - t0 >= ms) {
            break;
        }
        mp_event_wait_ms(ms - (t1 - t0));
    }
}

uint64_t mp_hal_time_ns(void) {
    return 0;
}

void system_tick_schedule_callback(void) {
    pendsv_schedule_dispatch(PENDSV_DISPATCH_SOFT_TIMER, soft_timer_handler);
}

uint32_t soft_timer_get_ms(void) {
    return mp_hal_ticks_ms();
}

void soft_timer_schedule_at_ms(uint32_t ticks_ms) {
    int32_t ms = soft_timer_ticks_diff(ticks_ms, mp_hal_ticks_ms());
    ms = MAX(0, ms);
    ms = MIN(ms, 4000000); // ensure ms * 1000 doesn't overflow
    system_tick_schedule_after_us(ms * 1000);
}