micropython/ports/samd/samd_soc.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* This file initialises the USB (tinyUSB) and USART (SERCOM). Board USART settings
* are set in 'boards/<board>/mpconfigboard.h.
*
* IMPORTANT: Please refer to "I/O Multiplexing and Considerations" chapters
* in device datasheets for I/O Pin functions and assignments.
*
* 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 "modmachine.h"
#include "samd_soc.h"
#include "sam.h"
#include "tusb.h"
#include "mphalport.h"
#if MICROPY_PY_MACHINE_RTC
extern void machine_rtc_start(bool force);
#endif
static void usb_init(void) {
// Init USB clock
#if defined(MCU_SAMD21)
GCLK->CLKCTRL.reg = GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK5 | GCLK_CLKCTRL_ID_USB;
PM->AHBMASK.bit.USB_ = 1;
PM->APBBMASK.bit.USB_ = 1;
uint8_t alt = 6; // alt G, USB
#elif defined(MCU_SAMD51)
GCLK->PCHCTRL[USB_GCLK_ID].reg = GCLK_PCHCTRL_CHEN | GCLK_PCHCTRL_GEN_GCLK5;
while (GCLK->PCHCTRL[USB_GCLK_ID].bit.CHEN == 0) {
}
MCLK->AHBMASK.bit.USB_ = 1;
MCLK->APBBMASK.bit.USB_ = 1;
uint8_t alt = 7; // alt H, USB
#endif
// Init USB pins
PORT->Group[0].DIRSET.reg = 1 << 25 | 1 << 24;
PORT->Group[0].OUTCLR.reg = 1 << 25 | 1 << 24;
PORT->Group[0].PMUX[12].reg = alt << 4 | alt;
PORT->Group[0].PINCFG[24].reg = PORT_PINCFG_PMUXEN;
PORT->Group[0].PINCFG[25].reg = PORT_PINCFG_PMUXEN;
tusb_init();
}
// Initialize the µs counter on TC 0/1 or TC4/5
void init_us_counter(void) {
#if defined(MCU_SAMD21)
PM->APBCMASK.bit.TC3_ = 1; // Enable TC3 clock
PM->APBCMASK.bit.TC4_ = 1; // Enable TC4 clock
// Select multiplexer generic clock source and enable.
GCLK->CLKCTRL.reg = GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK3 | GCLK_CLKCTRL_ID_TC4_TC5;
// Wait while it updates synchronously.
while (GCLK->STATUS.bit.SYNCBUSY) {
}
// configure the timer
TC4->COUNT32.CTRLA.bit.MODE = TC_CTRLA_MODE_COUNT32_Val;
TC4->COUNT32.CTRLA.bit.RUNSTDBY = 1;
TC4->COUNT32.CTRLA.bit.ENABLE = 1;
while (TC4->COUNT32.STATUS.bit.SYNCBUSY) {
}
TC4->COUNT32.READREQ.reg = TC_READREQ_RREQ | TC_READREQ_RCONT | 0x10;
while (TC4->COUNT32.STATUS.bit.SYNCBUSY) {
}
// Enable the IRQ
TC4->COUNT32.INTENSET.reg = TC_INTENSET_OVF;
NVIC_EnableIRQ(TC4_IRQn);
#elif defined(MCU_SAMD51)
MCLK->APBAMASK.bit.TC0_ = 1; // Enable TC0 clock
MCLK->APBAMASK.bit.TC1_ = 1; // Enable TC1 clock
// Peripheral channel 9 is driven by GCLK3, 8 MHz.
GCLK->PCHCTRL[TC0_GCLK_ID].reg = GCLK_PCHCTRL_GEN_GCLK3 | GCLK_PCHCTRL_CHEN;
while (GCLK->PCHCTRL[TC0_GCLK_ID].bit.CHEN == 0) {
}
// configure the timer
TC0->COUNT32.CTRLA.bit.PRESCALER = 0;
TC0->COUNT32.CTRLA.bit.MODE = TC_CTRLA_MODE_COUNT32_Val;
TC0->COUNT32.CTRLA.bit.RUNSTDBY = 1;
TC0->COUNT32.CTRLA.bit.ENABLE = 1;
while (TC0->COUNT32.SYNCBUSY.bit.ENABLE) {
}
// Enable the IRQ
TC0->COUNT32.INTENSET.reg = TC_INTENSET_OVF;
NVIC_EnableIRQ(TC0_IRQn);
#endif
}
void samd_init(void) {
init_clocks(get_cpu_freq());
init_us_counter();
usb_init();
check_usb_recovery_mode();
#if defined(MCU_SAMD51)
mp_hal_ticks_cpu_enable();
#endif
#if MICROPY_PY_MACHINE_RTC
machine_rtc_start(false);
#endif
}
#if MICROPY_PY_MACHINE_I2C || MICROPY_PY_MACHINE_SPI || MICROPY_PY_MACHINE_UART
Sercom *sercom_instance[] = SERCOM_INSTS;
MP_REGISTER_ROOT_POINTER(void *sercom_table[SERCOM_INST_NUM]);
// Common Sercom functions used by all Serial devices
void sercom_enable(Sercom *uart, int state) {
uart->USART.CTRLA.bit.ENABLE = state; // Set the state on/off
// Wait for the Registers to update.
while (uart->USART.SYNCBUSY.bit.ENABLE) {
}
}
void sercom_deinit_all(void) {
for (int i = 0; i < SERCOM_INST_NUM; i++) {
Sercom *uart = sercom_instance[i];
uart->USART.INTENCLR.reg = 0xff;
sercom_register_irq(i, NULL);
sercom_enable(uart, 0);
MP_STATE_PORT(sercom_table[i]) = NULL;
}
}
#endif
void samd_get_unique_id(samd_unique_id_t *id) {
// Atmel SAM D21E / SAM D21G / SAM D21J
// SMART ARM-Based Microcontroller
// DATASHEET
// 9.6 (SAMD51) or 9.3.3 (or 10.3.3 depending on which manual)(SAMD21) Serial Number
//
// EXAMPLE (SAMD21)
// ----------------
// OpenOCD:
// Word0:
// > at91samd21g18.cpu mdw 0x0080A00C 1
// 0x0080a00c: 6e27f15f
// Words 1-3:
// > at91samd21g18.cpu mdw 0x0080A040 3
// 0x0080a040: 50534b54 332e3120 ff091645
//
// MicroPython (this code and same order as shown in Arduino IDE)
// >>> binascii.hexlify(machine.unique_id())
// b'6e27f15f50534b54332e3120ff091645'
#if defined(MCU_SAMD21)
uint32_t *id_addresses[4] = {(uint32_t *)0x0080A00C, (uint32_t *)0x0080A040,
(uint32_t *)0x0080A044, (uint32_t *)0x0080A048};
#elif defined(MCU_SAMD51)
uint32_t *id_addresses[4] = {(uint32_t *)0x008061FC, (uint32_t *)0x00806010,
(uint32_t *)0x00806014, (uint32_t *)0x00806018};
#endif
for (int i = 0; i < 4; i++) {
for (int k = 0; k < 4; k++) {
// 'Reverse' the read bytes into a 32 bit word (Consistent with Arduino)
id->bytes[4 * i + k] = (*(id_addresses[i]) >> (24 - k * 8)) & 0xff;
}
}
}