circuitpython/ports/mimxrt/mphalport.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2019 Damien P. George
* Copyright (c) 2020 Jim Mussared
*
* 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 "shared/timeutils/timeutils.h"
#include "shared/runtime/interrupt_char.h"
#include "extmod/misc.h"
#include "ticks.h"
#include "tusb.h"
#include "fsl_snvs_lp.h"
#ifndef MICROPY_HW_STDIN_BUFFER_LEN
#define MICROPY_HW_STDIN_BUFFER_LEN 512
#endif
#include CPU_HEADER_H
STATIC uint8_t stdin_ringbuf_array[MICROPY_HW_STDIN_BUFFER_LEN];
ringbuf_t stdin_ringbuf = {stdin_ringbuf_array, sizeof(stdin_ringbuf_array), 0, 0};
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;
}
}
}
uintptr_t mp_hal_stdio_poll(uintptr_t poll_flags) {
uintptr_t ret = 0;
poll_cdc_interfaces();
if ((poll_flags & MP_STREAM_POLL_RD) && ringbuf_peek(&stdin_ringbuf) != -1) {
ret |= MP_STREAM_POLL_RD;
}
if ((poll_flags & MP_STREAM_POLL_WR) && tud_cdc_connected() && tud_cdc_write_available() > 0) {
ret |= MP_STREAM_POLL_WR;
}
#if MICROPY_PY_OS_DUPTERM
ret |= mp_os_dupterm_poll(poll_flags);
#endif
return ret;
}
int mp_hal_stdin_rx_chr(void) {
for (;;) {
poll_cdc_interfaces();
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
}
}
void mp_hal_stdout_tx_strn(const char *str, mp_uint_t len) {
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;
}
uint64_t timeout = ticks_us64() + (uint64_t)(MICROPY_HW_USB_CDC_TX_TIMEOUT * 1000);
// Wait with a max of USC_CDC_TIMEOUT ms
while (n > tud_cdc_write_available() && ticks_us64() < timeout) {
MICROPY_EVENT_POLL_HOOK
}
if (ticks_us64() >= timeout) {
break;
}
uint32_t n2 = tud_cdc_write(str + i, n);
tud_cdc_write_flush();
i += n2;
}
}
#if MICROPY_PY_OS_DUPTERM
mp_os_dupterm_tx_strn(str, len);
#endif
}
uint64_t mp_hal_time_ns(void) {
snvs_lp_srtc_datetime_t t;
SNVS_LP_SRTC_GetDatetime(SNVS, &t);
uint64_t s = timeutils_seconds_since_epoch(t.year, t.month, t.day, t.hour, t.minute, t.second);
return s * 1000000000ULL;
}
/*******************************************************************************/
// MAC address
void mp_hal_get_unique_id(uint8_t id[]) {
#if defined CPU_MIMXRT1176_cm7
*(uint32_t *)id = OCOTP->FUSEN[0x10].FUSE;
*(uint32_t *)(id + 4) = OCOTP->FUSEN[0x11].FUSE;
#else
*(uint32_t *)id = OCOTP->CFG0;
*(uint32_t *)(id + 4) = OCOTP->CFG1;
#endif
}
// Generate a random locally administered MAC address (LAA)
void mp_hal_generate_laa_mac(int idx, uint8_t buf[6]) {
// Take the MAC addr from the OTP's Configuration and Manufacturing Info
unsigned char id[8];
mp_hal_get_unique_id(id);
uint32_t *pt1 = (uint32_t *)id;
uint32_t *pt2 = (uint32_t *)(id + 4);
buf[0] = 0x02; // Locally Administered MAC
*(uint32_t *)&buf[1] = *pt1 ^ (*pt1 >> 8);
*(uint16_t *)&buf[4] = (uint16_t)(*pt2 ^ *pt2 >> 16);
buf[5] ^= (uint8_t)idx;
}
// A board can override this if needed
MP_WEAK void mp_hal_get_mac(int idx, uint8_t buf[6]) {
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];
}
}