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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) 2019 Damien P. George
* Copyright (c) 2022 Robert Hammelrath
*
* 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/mphal.h"
#include "py/stream.h"
#include "shared/runtime/interrupt_char.h"
#include "shared/tinyusb/mp_usbd.h"
#include "shared/tinyusb/mp_usbd_cdc.h"
AD02
#include "extmod/misc.h"
#include "samd_soc.h"
#include "tusb.h"
#ifndef MICROPY_HW_STDIN_BUFFER_LEN
#define MICROPY_HW_STDIN_BUFFER_LEN 128
#endif
extern volatile uint32_t ticks_us64_upper;
static uint8_t stdin_ringbuf_array[MICROPY_HW_STDIN_BUFFER_LEN];
ringbuf_t stdin_ringbuf = { stdin_ringbuf_array, sizeof(stdin_ringbuf_array), 0, 0 };
// Explicitly run the USB stack in case the scheduler is locked (eg we are in an
// interrupt handler) and there is in/out data pending on the USB CDC interface.
#define MICROPY_EVENT_POLL_HOOK_WITH_USB \
do { \
MICROPY_EVENT_POLL_HOOK; \
mp_usbd_task(); \
} while (0)
void mp_hal_set_pin_mux(mp_hal_pin_obj_t pin, uint8_t mux) {
int pin_grp = pin / 32;
int port_grp = (pin % 32) / 2;
PORT->Group[pin_grp].PINCFG[pin % 32].bit.PMUXEN = 1; // Enable Mux
if (pin & 1) {
PORT->Group[pin_grp].PMUX[port_grp].bit.PMUXO = mux;
} else {
PORT->Group[pin_grp].PMUX[port_grp].bit.PMUXE = mux;
}
}
void mp_hal_clr_pin_mux(mp_hal_pin_obj_t pin) {
int pin_grp = pin / 32;
PORT->Group[pin_grp].PINCFG[pin % 32].bit.PMUXEN = 0; // Disable Mux
}
void mp_hal_delay_ms(mp_uint_t ms) {
uint32_t t0 = systick_ms;
while (systick_ms - t0 < ms) {
MICROPY_EVENT_POLL_HOOK
}
}
void mp_hal_delay_us(mp_uint_t us) {
if (us > 0) {
#if defined(MCU_SAMD21)
uint32_t start = mp_hal_ticks_us();
while ((mp_hal_ticks_us() - start) < us) {
}
#else
uint64_t stop = mp_hal_ticks_us_64() + us;
while (mp_hal_ticks_us_64() < stop) {
}
#endif
}
}
uint64_t mp_hal_ticks_us_64(void) {
uint32_t us64_lower;
uint8_t intflag;
__disable_irq();
uint32_t us64_upper = ticks_us64_upper;
#if defined(MCU_SAMD21)
us64_lower = REG_TC4_COUNT32_COUNT;
intflag = TC4->COUNT32.INTFLAG.reg;
#elif defined(MCU_SAMD51)
TC0->COUNT32.CTRLBSET.reg = TC_CTRLBSET_CMD_READSYNC;
while (TC0->COUNT32.CTRLBSET.reg != 0) {
}
us64_lower = REG_TC0_COUNT32_COUNT;
intflag = TC0->COUNT32.INTFLAG.reg;
#endif
__enable_irq();
if ((intflag & TC_INTFLAG_OVF) && us64_lower < 0x10000000) {
// The timer counter overflowed before reading it but the IRQ handler
// has not yet been called, so perform the IRQ arithmetic now.
us64_upper++;
}
#if defined(MCU_SAMD21)
return ((uint64_t)us64_upper << 31) | (us64_lower >> 1);
#elif defined(MCU_SAMD51)
return ((uint64_t)us64_upper << 28) | (us64_lower >> 4);
#endif
}
uintptr_t mp_hal_stdio_poll(uintptr_t poll_flags) {
uintptr_t ret = 0;
ret |= mp_usbd_cdc_poll_interfaces(poll_flags);
#if MICROPY_PY_OS_DUPTERM
ret |= mp_os_dupterm_poll(poll_flags);
#endif
return ret;
}
int mp_hal_stdin_rx_chr(void) {
for (;;) {
mp_usbd_cdc_poll_interfaces(0);
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_WITH_USB;
}
}
mp_uint_t mp_hal_stdout_tx_strn(const char *str, mp_uint_t len) {
mp_uint_t ret = len;
bool did_write = false;
mp_uint_t cdc_res = mp_usbd_cdc_tx_strn(str, len);
if (cdc_res > 0) {
did_write = true;
ret = MIN(cdc_res, ret);
}
#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;
}