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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" | |
extern void machine_rtc_start(bool force); | |
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; | |
} | |
// 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(); | |
#if defined(MCU_SAMD51) | |
mp_hal_ticks_cpu_enable(); | |
#endif | |
machine_rtc_start(false); | |
} | |
#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; | |
} | |
} | |
} |