285 lines
9.1 KiB
C
285 lines
9.1 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2020-2021 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "py/runtime.h"
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#include "py/stream.h"
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#include "py/mphal.h"
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#include "extmod/misc.h"
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#include "shared/runtime/interrupt_char.h"
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#include "shared/runtime/softtimer.h"
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#include "shared/timeutils/timeutils.h"
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#include "shared/tinyusb/mp_usbd.h"
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#include "pendsv.h"
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#include "tusb.h"
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#include "uart.h"
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#include "hardware/rtc.h"
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#include "pico/unique_id.h"
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#if MICROPY_PY_NETWORK_CYW43
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#include "lib/cyw43-driver/src/cyw43.h"
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#endif
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// This needs to be added to the result of time_us_64() to get the number of
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// microseconds since the Epoch.
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STATIC uint64_t time_us_64_offset_from_epoch;
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static alarm_id_t soft_timer_alarm_id = 0;
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#if MICROPY_HW_ENABLE_UART_REPL || MICROPY_HW_USB_CDC
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#ifndef MICROPY_HW_STDIN_BUFFER_LEN
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#define MICROPY_HW_STDIN_BUFFER_LEN 512
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#endif
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STATIC uint8_t stdin_ringbuf_array[MICROPY_HW_STDIN_BUFFER_LEN];
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ringbuf_t stdin_ringbuf = { stdin_ringbuf_array, sizeof(stdin_ringbuf_array) };
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#endif
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#if MICROPY_HW_USB_CDC
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// Explicitly run the USB stack in case the scheduler is locked (eg we are in an
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// interrupt handler) and there is in/out data pending on the USB CDC interface.
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#define MICROPY_EVENT_POLL_HOOK_WITH_USB \
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do { \
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MICROPY_EVENT_POLL_HOOK; \
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mp_usbd_task(); \
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} while (0)
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#else
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#define MICROPY_EVENT_POLL_HOOK_WITH_USB MICROPY_EVENT_POLL_HOOK
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#endif
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#if MICROPY_HW_USB_CDC
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uint8_t cdc_itf_pending; // keep track of cdc interfaces which need attention to poll
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void poll_cdc_interfaces(void) {
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// any CDC interfaces left to poll?
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if (cdc_itf_pending && ringbuf_free(&stdin_ringbuf)) {
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for (uint8_t itf = 0; itf < 8; ++itf) {
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if (cdc_itf_pending & (1 << itf)) {
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tud_cdc_rx_cb(itf);
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if (!cdc_itf_pending) {
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break;
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}
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}
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}
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}
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}
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void tud_cdc_rx_cb(uint8_t itf) {
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// consume pending USB data immediately to free usb buffer and keep the endpoint from stalling.
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// in case the ringbuffer is full, mark the CDC interface that need attention later on for polling
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cdc_itf_pending &= ~(1 << itf);
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for (uint32_t bytes_avail = tud_cdc_n_available(itf); bytes_avail > 0; --bytes_avail) {
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if (ringbuf_free(&stdin_ringbuf)) {
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int data_char = tud_cdc_read_char();
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if (data_char == mp_interrupt_char) {
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mp_sched_keyboard_interrupt();
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} else {
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ringbuf_put(&stdin_ringbuf, data_char);
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}
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} else {
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cdc_itf_pending |= (1 << itf);
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return;
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}
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}
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}
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#endif
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uintptr_t mp_hal_stdio_poll(uintptr_t poll_flags) {
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uintptr_t ret = 0;
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#if MICROPY_HW_USB_CDC
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poll_cdc_interfaces();
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#endif
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#if MICROPY_HW_ENABLE_UART_REPL || MICROPY_HW_USB_CDC
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if ((poll_flags & MP_STREAM_POLL_RD) && ringbuf_peek(&stdin_ringbuf) != -1) {
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ret |= MP_STREAM_POLL_RD;
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}
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if (poll_flags & MP_STREAM_POLL_WR) {
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#if MICROPY_HW_ENABLE_UART_REPL
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ret |= MP_STREAM_POLL_WR;
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#else
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if (tud_cdc_connected() && tud_cdc_write_available() > 0) {
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ret |= MP_STREAM_POLL_WR;
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}
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#endif
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}
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#endif
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#if MICROPY_PY_OS_DUPTERM
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ret |= mp_os_dupterm_poll(poll_flags);
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#endif
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return ret;
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}
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// Receive single character
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int mp_hal_stdin_rx_chr(void) {
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for (;;) {
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#if MICROPY_HW_USB_CDC
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poll_cdc_interfaces();
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#endif
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int c = ringbuf_get(&stdin_ringbuf);
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if (c != -1) {
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return c;
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}
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#if MICROPY_PY_OS_DUPTERM
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int dupterm_c = mp_os_dupterm_rx_chr();
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if (dupterm_c >= 0) {
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return dupterm_c;
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}
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#endif
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MICROPY_EVENT_POLL_HOOK_WITH_USB;
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}
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}
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// Send string of given length
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void mp_hal_stdout_tx_strn(const char *str, mp_uint_t len) {
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#if MICROPY_HW_ENABLE_UART_REPL
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mp_uart_write_strn(str, len);
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#endif
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#if MICROPY_HW_USB_CDC
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if (tud_cdc_connected()) {
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for (size_t i = 0; i < len;) {
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uint32_t n = len - i;
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if (n > CFG_TUD_CDC_EP_BUFSIZE) {
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n = CFG_TUD_CDC_EP_BUFSIZE;
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}
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int timeout = 0;
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// Wait with a max of USC_CDC_TIMEOUT ms
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while (n > tud_cdc_write_available() && timeout++ < MICROPY_HW_USB_CDC_TX_TIMEOUT) {
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MICROPY_EVENT_POLL_HOOK_WITH_USB;
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}
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if (timeout >= MICROPY_HW_USB_CDC_TX_TIMEOUT) {
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break;
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}
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uint32_t n2 = tud_cdc_write(str + i, n);
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tud_cdc_write_flush();
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i += n2;
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}
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}
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#endif
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#if MICROPY_PY_OS_DUPTERM
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mp_os_dupterm_tx_strn(str, len);
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#endif
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}
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void mp_hal_delay_ms(mp_uint_t ms) {
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absolute_time_t t = make_timeout_time_ms(ms);
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do {
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MICROPY_EVENT_POLL_HOOK_FAST;
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} while (!best_effort_wfe_or_timeout(t));
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}
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void mp_hal_time_ns_set_from_rtc(void) {
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// Delay at least one RTC clock cycle so it's registers have updated with the most
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// recent time settings.
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sleep_us(23);
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// Sample RTC and time_us_64() as close together as possible, so the offset
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// calculated for the latter can be as accurate as possible.
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datetime_t t;
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rtc_get_datetime(&t);
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uint64_t us = time_us_64();
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// Calculate the difference between the RTC Epoch seconds and time_us_64().
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uint64_t s = timeutils_seconds_since_epoch(t.year, t.month, t.day, t.hour, t.min, t.sec);
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time_us_64_offset_from_epoch = (uint64_t)s * 1000000ULL - us;
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}
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uint64_t mp_hal_time_ns(void) {
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// The RTC only has seconds resolution, so instead use time_us_64() to get a more
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// precise measure of Epoch time. Both these "clocks" are clocked from the same
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// source so they remain synchronised, and only differ by a fixed offset (calculated
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// in mp_hal_time_ns_set_from_rtc).
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return (time_us_64_offset_from_epoch + time_us_64()) * 1000ULL;
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}
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// Generate a random locally administered MAC address (LAA)
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void mp_hal_generate_laa_mac(int idx, uint8_t buf[6]) {
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#ifndef NDEBUG
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printf("Warning: No MAC in OTP, generating MAC from board id\n");
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#endif
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pico_unique_board_id_t pid;
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pico_get_unique_board_id(&pid);
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buf[0] = 0x02; // LAA range
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buf[1] = (pid.id[7] << 4) | (pid.id[6] & 0xf);
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buf[2] = (pid.id[5] << 4) | (pid.id[4] & 0xf);
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buf[3] = (pid.id[3] << 4) | (pid.id[2] & 0xf);
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buf[4] = pid.id[1];
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buf[5] = (pid.id[0] << 2) | idx;
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}
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// A board can override this if needed
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MP_WEAK void mp_hal_get_mac(int idx, uint8_t buf[6]) {
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#if MICROPY_PY_NETWORK_CYW43
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// The mac should come from cyw43 otp when CYW43_USE_OTP_MAC is defined
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// This is loaded into the state after the driver is initialised
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// cyw43_hal_generate_laa_mac is only called by the driver to generate a mac if otp is not set
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if (idx == MP_HAL_MAC_WLAN0) {
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memcpy(buf, cyw43_state.mac, 6);
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return;
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}
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#endif
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mp_hal_generate_laa_mac(idx, buf);
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}
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void mp_hal_get_mac_ascii(int idx, size_t chr_off, size_t chr_len, char *dest) {
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static const char hexchr[16] = "0123456789ABCDEF";
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uint8_t mac[6];
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mp_hal_get_mac(idx, mac);
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for (; chr_len; ++chr_off, --chr_len) {
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*dest++ = hexchr[mac[chr_off >> 1] >> (4 * (1 - (chr_off & 1))) & 0xf];
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}
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}
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// Shouldn't be used, needed by cyw43-driver in debug build.
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uint32_t storage_read_blocks(uint8_t *dest, uint32_t block_num, uint32_t num_blocks) {
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panic_unsupported();
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}
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static int64_t soft_timer_callback(alarm_id_t id, void *user_data) {
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soft_timer_alarm_id = 0;
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pendsv_schedule_dispatch(PENDSV_DISPATCH_SOFT_TIMER, soft_timer_handler);
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return 0; // don't reschedule this alarm
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}
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uint32_t soft_timer_get_ms(void) {
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return mp_hal_ticks_ms();
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}
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void soft_timer_schedule_at_ms(uint32_t ticks_ms) {
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if (soft_timer_alarm_id != 0) {
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cancel_alarm(soft_timer_alarm_id);
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}
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int32_t ms = soft_timer_ticks_diff(ticks_ms, mp_hal_ticks_ms());
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ms = MAX(0, ms);
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soft_timer_alarm_id = add_alarm_in_ms(ms, soft_timer_callback, NULL, true);
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}
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