114 lines
4.0 KiB
C
114 lines
4.0 KiB
C
/*
|
|
* 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"
|
|
|
|
static void usb_init(void) {
|
|
// Init USB clock
|
|
#if defined(MCU_SAMD21)
|
|
GCLK->CLKCTRL.reg = GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK0 | 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_GCLK2;
|
|
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 microsecond counter on TC 0/1
|
|
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) {
|
|
}
|
|
|
|
#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) {
|
|
}
|
|
|
|
#endif
|
|
}
|
|
|
|
void samd_init(void) {
|
|
init_clocks(get_cpu_freq());
|
|
SysTick_Config(get_cpu_freq() / 1000);
|
|
init_us_counter();
|
|
usb_init();
|
|
}
|