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mphalport.c
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mphalport.c
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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2020-2021 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 "py/runtime.h"
#include "py/stream.h"
#include "py/mphal.h"
#include "extmod/misc.h"
#include "shared/runtime/interrupt_char.h"
#include "shared/timeutils/timeutils.h"
#include "tusb.h"
#include "uart.h"
#include "hardware/rtc.h"
#include "pico/unique_id.h"
#if MICROPY_PY_NETWORK_CYW43
#include "lib/cyw43-driver/src/cyw43.h"
#endif
// This needs to be added to the result of time_us_64() to get the number of
// microseconds since the Epoch.
STATIC uint64_t time_us_64_offset_from_epoch;
#if MICROPY_HW_ENABLE_UART_REPL || MICROPY_HW_USB_CDC
#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) };
#endif
#if MICROPY_HW_USB_CDC
uint8_t cdc_itf_pending; // keep track of cdc interfaces which need attention to poll
void poll_cdc_interfaces(void) {
// any CDC interfaces left to poll?
if (cdc_itf_pending && ringbuf_free(&stdin_ringbuf)) {
for (uint8_t itf = 0; itf < 8; ++itf) {
if (cdc_itf_pending & (1 << itf)) {
tud_cdc_rx_cb(itf);
if (!cdc_itf_pending) {
break;
}
}
}
}
}
void tud_cdc_rx_cb(uint8_t itf) {
// consume pending USB data immediately to free usb buffer and keep the endpoint from stalling.
// in case the ringbuffer is full, mark the CDC interface that need attention later on for polling
cdc_itf_pending &= ~(1 << itf);
for (uint32_t bytes_avail = tud_cdc_n_available(itf); bytes_avail > 0; --bytes_avail) {
if (ringbuf_free(&stdin_ringbuf)) {
int data_char = tud_cdc_read_char();
if (data_char == mp_interrupt_char) {
mp_sched_keyboard_interrupt();
} else {
ringbuf_put(&stdin_ringbuf, data_char);
}
} else {
cdc_itf_pending |= (1 << itf);
return;
}
}
}
#endif
uintptr_t mp_hal_stdio_poll(uintptr_t poll_flags) {
uintptr_t ret = 0;
#if MICROPY_HW_USB_CDC
poll_cdc_interfaces();
#endif
#if MICROPY_HW_ENABLE_UART_REPL || MICROPY_HW_USB_CDC
if ((poll_flags & MP_STREAM_POLL_RD) && ringbuf_peek(&stdin_ringbuf) != -1) {
ret |= MP_STREAM_POLL_RD;
}
if (poll_flags & MP_STREAM_POLL_WR) {
#if MICROPY_HW_ENABLE_UART_REPL
ret |= MP_STREAM_POLL_WR;
#else
if (tud_cdc_connected() && tud_cdc_write_available() > 0) {
ret |= MP_STREAM_POLL_WR;
}
#endif
}
#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
poll_cdc_interfaces();
#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
MICROPY_EVENT_POLL_HOOK
}
}
// Send string of given length
void mp_hal_stdout_tx_strn(const char *str, mp_uint_t len) {
#if MICROPY_HW_ENABLE_UART_REPL
mp_uart_write_strn(str, len);
#endif
#if MICROPY_HW_USB_CDC
if (tud_cdc_connected()) {
for (size_t i = 0; i < len;) {
uint32_t n = len - i;
if (n > CFG_TUD_CDC_EP_BUFSIZE) {
n = CFG_TUD_CDC_EP_BUFSIZE;
}
int timeout = 0;
// Wait with a max of USC_CDC_TIMEOUT ms
while (n > tud_cdc_write_available() && timeout++ < MICROPY_HW_USB_CDC_TX_TIMEOUT) {
MICROPY_EVENT_POLL_HOOK
}
if (timeout >= MICROPY_HW_USB_CDC_TX_TIMEOUT) {
break;
}
uint32_t n2 = tud_cdc_write(str + i, n);
tud_cdc_write_flush();
i += n2;
}
}
#endif
#if MICROPY_PY_OS_DUPTERM
mp_os_dupterm_tx_strn(str, len);
#endif
}
void mp_hal_delay_ms(mp_uint_t ms) {
absolute_time_t t = make_timeout_time_ms(ms);
while (!time_reached(t)) {
MICROPY_EVENT_POLL_HOOK_FAST;
best_effort_wfe_or_timeout(t);
}
}
void mp_hal_time_ns_set_from_rtc(void) {
// Delay at least one RTC clock cycle so it's registers have updated with the most
// recent time settings.
sleep_us(23);
// Sample RTC and time_us_64() as close together as possible, so the offset
// calculated for the latter can be as accurate as possible.
datetime_t t;
rtc_get_datetime(&t);
uint64_t us = time_us_64();
// Calculate the difference between the RTC Epoch seconds and time_us_64().
uint64_t s = timeutils_seconds_since_epoch(t.year, t.month, t.day, t.hour, t.min, t.sec);
time_us_64_offset_from_epoch = (uint64_t)s * 1000000ULL - us;
}
uint64_t mp_hal_time_ns(void) {
// The RTC only has seconds resolution, so instead use time_us_64() to get a more
// precise measure of Epoch time. Both these "clocks" are clocked from the same
// source so they remain synchronised, and only differ by a fixed offset (calculated
// in mp_hal_time_ns_set_from_rtc).
return (time_us_64_offset_from_epoch + time_us_64()) * 1000ULL;
}
// Generate a random locally administered MAC address (LAA)
void mp_hal_generate_laa_mac(int idx, uint8_t buf[6]) {
#ifndef NDEBUG
printf("Warning: No MAC in OTP, generating MAC from board id\n");
#endif
pico_unique_board_id_t pid;
pico_get_unique_board_id(&pid);
buf[0] = 0x02; // LAA range
buf[1] = (pid.id[7] << 4) | (pid.id[6] & 0xf);
buf[2] = (pid.id[5] << 4) | (pid.id[4] & 0xf);
buf[3] = (pid.id[3] << 4) | (pid.id[2] & 0xf);
buf[4] = pid.id[1];
buf[5] = (pid.id[0] << 2) | idx;
}
// A board can override this if needed
MP_WEAK void mp_hal_get_mac(int idx, uint8_t buf[6]) {
#if MICROPY_PY_NETWORK_CYW43
// The mac should come from cyw43 otp when CYW43_USE_OTP_MAC is defined
// This is loaded into the state after the driver is initialised
// cyw43_hal_generate_laa_mac is only called by the driver to generate a mac if otp is not set
if (idx == MP_HAL_MAC_WLAN0) {
memcpy(buf, cyw43_state.mac, 6);
return;
}
#endif
mp_hal_generate_laa_mac(idx, buf);
}
void mp_hal_get_mac_ascii(int idx, size_t chr_off, size_t chr_len, char *dest) {
static const char hexchr[16] = "0123456789ABCDEF";
uint8_t mac[6];
mp_hal_get_mac(idx, mac);
for (; chr_len; ++chr_off, --chr_len) {
*dest++ = hexchr[mac[chr_off >> 1] >> (4 * (1 - (chr_off & 1))) & 0xf];
}
}
// Shouldn't be used, needed by cyw43-driver in debug build.
uint32_t storage_read_blocks(uint8_t *dest, uint32_t block_num, uint32_t num_blocks) {
panic_unsupported();
}