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circuitpython/ports/samd/mcu/samd21/clock_config.c

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samd/clock_config: Split clock_config.c to separate SAMD21/SAMD51 files. And put the file into the mcu directory. The file got a little bit long and hard to read.
2022-06-15 12:49:24 -04:00
/*
* This file is part of the MicroPython project, http://micropython.org/
*
* This file provides functions for configuring the clocks.
*
* The MIT License (MIT)
*
* 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 <stdint.h>
#include "py/runtime.h"
samd/clock_config: Add HW_DFLL_USB_SYNC and HW_MCU_OSC32KULP extensions. Two new compile flags are: MICROPY_HW_DFLL_USB_SYNC: Effective only if DFLL48 does not run from the crystal. It will synchronize the DFLL48M clock with the USB's SOF pulse. If no USB is connected, it will fall back to open loop mode. The DFLL48M clock is then pretty precise, but with a higher clock jitter at SAMD51 devices. MICROPY_HW_MCU_OSC32KULP: Effective only if the devics uses a crystal as clock source. Run the MCU clock from the ULP 32kHz oszillator instead of the crystal. This flag was added to cater for a interference problem of the crystal and Neopixel/Debug pins at Adafruit FEATHER Mx boards, which causes the board to crash. Drawback: ticks_ms() and time.time() vs. than ticks_us() and the peripherals like PWM run at not synchronous clocks.
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#include "py/mphal.h"
samd/clock_config: Split clock_config.c to separate SAMD21/SAMD51 files. And put the file into the mcu directory. The file got a little bit long and hard to read.
2022-06-15 12:49:24 -04:00
#include "samd_soc.h"
static uint32_t cpu_freq = CPU_FREQ;
static uint32_t apb_freq = APB_FREQ;
samd/clock_config: Add HW_DFLL_USB_SYNC and HW_MCU_OSC32KULP extensions. Two new compile flags are: MICROPY_HW_DFLL_USB_SYNC: Effective only if DFLL48 does not run from the crystal. It will synchronize the DFLL48M clock with the USB's SOF pulse. If no USB is connected, it will fall back to open loop mode. The DFLL48M clock is then pretty precise, but with a higher clock jitter at SAMD51 devices. MICROPY_HW_MCU_OSC32KULP: Effective only if the devics uses a crystal as clock source. Run the MCU clock from the ULP 32kHz oszillator instead of the crystal. This flag was added to cater for a interference problem of the crystal and Neopixel/Debug pins at Adafruit FEATHER Mx boards, which causes the board to crash. Drawback: ticks_ms() and time.time() vs. than ticks_us() and the peripherals like PWM run at not synchronous clocks.
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static uint32_t dfll48m_calibration;
samd/clock_config: Split clock_config.c to separate SAMD21/SAMD51 files. And put the file into the mcu directory. The file got a little bit long and hard to read.
2022-06-15 12:49:24 -04:00
int sercom_gclk_id[] = {
GCLK_CLKCTRL_ID_SERCOM0_CORE, GCLK_CLKCTRL_ID_SERCOM1_CORE,
GCLK_CLKCTRL_ID_SERCOM2_CORE, GCLK_CLKCTRL_ID_SERCOM3_CORE,
GCLK_CLKCTRL_ID_SERCOM4_CORE, GCLK_CLKCTRL_ID_SERCOM5_CORE
};
uint32_t get_cpu_freq(void) {
return cpu_freq;
}
uint32_t get_apb_freq(void) {
return apb_freq;
}
void set_cpu_freq(uint32_t cpu_freq_arg) {
cpu_freq = cpu_freq_arg;
}
samd/clock_config: Add HW_DFLL_USB_SYNC and HW_MCU_OSC32KULP extensions. Two new compile flags are: MICROPY_HW_DFLL_USB_SYNC: Effective only if DFLL48 does not run from the crystal. It will synchronize the DFLL48M clock with the USB's SOF pulse. If no USB is connected, it will fall back to open loop mode. The DFLL48M clock is then pretty precise, but with a higher clock jitter at SAMD51 devices. MICROPY_HW_MCU_OSC32KULP: Effective only if the devics uses a crystal as clock source. Run the MCU clock from the ULP 32kHz oszillator instead of the crystal. This flag was added to cater for a interference problem of the crystal and Neopixel/Debug pins at Adafruit FEATHER Mx boards, which causes the board to crash. Drawback: ticks_ms() and time.time() vs. than ticks_us() and the peripherals like PWM run at not synchronous clocks.
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void check_usb_recovery_mode(void) {
#if !MICROPY_HW_XOSC32K
mp_hal_delay_ms(500);
// Check USB status. If not connected, switch DFLL48M back to open loop
if (USB->DEVICE.DeviceEndpoint[0].EPCFG.reg == 0) {
// Set/keep the open loop mode of the device.
SYSCTRL->DFLLVAL.reg = dfll48m_calibration;
SYSCTRL->DFLLCTRL.reg = SYSCTRL_DFLLCTRL_CCDIS | SYSCTRL_DFLLCTRL_ENABLE;
}
#endif // MICROPY_HW_XOSC32K
}
samd/clock_config: Split clock_config.c to separate SAMD21/SAMD51 files. And put the file into the mcu directory. The file got a little bit long and hard to read.
2022-06-15 12:49:24 -04:00
void init_clocks(uint32_t cpu_freq) {
samd/clock_config: Add HW_DFLL_USB_SYNC and HW_MCU_OSC32KULP extensions. Two new compile flags are: MICROPY_HW_DFLL_USB_SYNC: Effective only if DFLL48 does not run from the crystal. It will synchronize the DFLL48M clock with the USB's SOF pulse. If no USB is connected, it will fall back to open loop mode. The DFLL48M clock is then pretty precise, but with a higher clock jitter at SAMD51 devices. MICROPY_HW_MCU_OSC32KULP: Effective only if the devics uses a crystal as clock source. Run the MCU clock from the ULP 32kHz oszillator instead of the crystal. This flag was added to cater for a interference problem of the crystal and Neopixel/Debug pins at Adafruit FEATHER Mx boards, which causes the board to crash. Drawback: ticks_ms() and time.time() vs. than ticks_us() and the peripherals like PWM run at not synchronous clocks.
2022-06-15 12:58:02 -04:00
dfll48m_calibration = 0; // please the compiler
samd/clock_config: Split clock_config.c to separate SAMD21/SAMD51 files. And put the file into the mcu directory. The file got a little bit long and hard to read.
2022-06-15 12:49:24 -04:00
// SAMD21 Clock settings
// GCLK0: 48MHz from DFLL open loop mode or closed loop mode from 32k Crystal
samd/clock_config: Add HW_DFLL_USB_SYNC and HW_MCU_OSC32KULP extensions. Two new compile flags are: MICROPY_HW_DFLL_USB_SYNC: Effective only if DFLL48 does not run from the crystal. It will synchronize the DFLL48M clock with the USB's SOF pulse. If no USB is connected, it will fall back to open loop mode. The DFLL48M clock is then pretty precise, but with a higher clock jitter at SAMD51 devices. MICROPY_HW_MCU_OSC32KULP: Effective only if the devics uses a crystal as clock source. Run the MCU clock from the ULP 32kHz oszillator instead of the crystal. This flag was added to cater for a interference problem of the crystal and Neopixel/Debug pins at Adafruit FEATHER Mx boards, which causes the board to crash. Drawback: ticks_ms() and time.time() vs. than ticks_us() and the peripherals like PWM run at not synchronous clocks.
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// GCLK1: 32768 Hz from 32K ULP or DFLL48M
samd/clock_config: Split clock_config.c to separate SAMD21/SAMD51 files. And put the file into the mcu directory. The file got a little bit long and hard to read.
2022-06-15 12:49:24 -04:00
// GCLK2: 48MHz from DFLL for Peripherals
// GCLK3: 1Mhz for the us-counter (TC4/TC5)
samd/clock_config: Add HW_DFLL_USB_SYNC and HW_MCU_OSC32KULP extensions. Two new compile flags are: MICROPY_HW_DFLL_USB_SYNC: Effective only if DFLL48 does not run from the crystal. It will synchronize the DFLL48M clock with the USB's SOF pulse. If no USB is connected, it will fall back to open loop mode. The DFLL48M clock is then pretty precise, but with a higher clock jitter at SAMD51 devices. MICROPY_HW_MCU_OSC32KULP: Effective only if the devics uses a crystal as clock source. Run the MCU clock from the ULP 32kHz oszillator instead of the crystal. This flag was added to cater for a interference problem of the crystal and Neopixel/Debug pins at Adafruit FEATHER Mx boards, which causes the board to crash. Drawback: ticks_ms() and time.time() vs. than ticks_us() and the peripherals like PWM run at not synchronous clocks.
2022-06-15 12:58:02 -04:00
// GCLK4: 32kHz from crystal, if present
samd/clock_config: Split clock_config.c to separate SAMD21/SAMD51 files. And put the file into the mcu directory. The file got a little bit long and hard to read.
2022-06-15 12:49:24 -04:00
// GCLK8: 1kHz clock for WDT
NVMCTRL->CTRLB.bit.MANW = 1; // errata "Spurious Writes"
NVMCTRL->CTRLB.bit.RWS = 1; // 1 read wait state for 48MHz
#if MICROPY_HW_XOSC32K
// Set up OSC32K according datasheet 17.6.3
SYSCTRL->XOSC32K.reg = SYSCTRL_XOSC32K_STARTUP(0x3) | SYSCTRL_XOSC32K_EN32K |
SYSCTRL_XOSC32K_XTALEN;
SYSCTRL->XOSC32K.bit.ENABLE = 1;
while (SYSCTRL->PCLKSR.bit.XOSC32KRDY == 0) {
}
// Set up the DFLL48 according to the data sheet 17.6.7.1.2
// Step 1: Set up the reference clock
samd/clock_config: Add HW_DFLL_USB_SYNC and HW_MCU_OSC32KULP extensions. Two new compile flags are: MICROPY_HW_DFLL_USB_SYNC: Effective only if DFLL48 does not run from the crystal. It will synchronize the DFLL48M clock with the USB's SOF pulse. If no USB is connected, it will fall back to open loop mode. The DFLL48M clock is then pretty precise, but with a higher clock jitter at SAMD51 devices. MICROPY_HW_MCU_OSC32KULP: Effective only if the devics uses a crystal as clock source. Run the MCU clock from the ULP 32kHz oszillator instead of the crystal. This flag was added to cater for a interference problem of the crystal and Neopixel/Debug pins at Adafruit FEATHER Mx boards, which causes the board to crash. Drawback: ticks_ms() and time.time() vs. than ticks_us() and the peripherals like PWM run at not synchronous clocks.
2022-06-15 12:58:02 -04:00
#if MICROPY_HW_MCU_OSC32KULP
// Connect the GCLK1 to the XOSC32KULP
GCLK->GENDIV.reg = GCLK_GENDIV_ID(1) | GCLK_GENDIV_DIV(1);
GCLK->GENCTRL.reg = GCLK_GENCTRL_GENEN | GCLK_GENCTRL_SRC_OSCULP32K | GCLK_GENCTRL_ID(1);
#else
// Connect the GCLK1 to OSC32K via GCLK1 to the DFLL input and for further use.
samd/clock_config: Split clock_config.c to separate SAMD21/SAMD51 files. And put the file into the mcu directory. The file got a little bit long and hard to read.
2022-06-15 12:49:24 -04:00
GCLK->GENDIV.reg = GCLK_GENDIV_ID(1) | GCLK_GENDIV_DIV(1);
GCLK->GENCTRL.reg = GCLK_GENCTRL_GENEN | GCLK_GENCTRL_SRC_XOSC32K | GCLK_GENCTRL_ID(1);
samd/clock_config: Add HW_DFLL_USB_SYNC and HW_MCU_OSC32KULP extensions. Two new compile flags are: MICROPY_HW_DFLL_USB_SYNC: Effective only if DFLL48 does not run from the crystal. It will synchronize the DFLL48M clock with the USB's SOF pulse. If no USB is connected, it will fall back to open loop mode. The DFLL48M clock is then pretty precise, but with a higher clock jitter at SAMD51 devices. MICROPY_HW_MCU_OSC32KULP: Effective only if the devics uses a crystal as clock source. Run the MCU clock from the ULP 32kHz oszillator instead of the crystal. This flag was added to cater for a interference problem of the crystal and Neopixel/Debug pins at Adafruit FEATHER Mx boards, which causes the board to crash. Drawback: ticks_ms() and time.time() vs. than ticks_us() and the peripherals like PWM run at not synchronous clocks.
2022-06-15 12:58:02 -04:00
#endif
samd/clock_config: Split clock_config.c to separate SAMD21/SAMD51 files. And put the file into the mcu directory. The file got a little bit long and hard to read.
2022-06-15 12:49:24 -04:00
while (GCLK->STATUS.bit.SYNCBUSY) {
}
samd/clock_config: Add HW_DFLL_USB_SYNC and HW_MCU_OSC32KULP extensions. Two new compile flags are: MICROPY_HW_DFLL_USB_SYNC: Effective only if DFLL48 does not run from the crystal. It will synchronize the DFLL48M clock with the USB's SOF pulse. If no USB is connected, it will fall back to open loop mode. The DFLL48M clock is then pretty precise, but with a higher clock jitter at SAMD51 devices. MICROPY_HW_MCU_OSC32KULP: Effective only if the devics uses a crystal as clock source. Run the MCU clock from the ULP 32kHz oszillator instead of the crystal. This flag was added to cater for a interference problem of the crystal and Neopixel/Debug pins at Adafruit FEATHER Mx boards, which causes the board to crash. Drawback: ticks_ms() and time.time() vs. than ticks_us() and the peripherals like PWM run at not synchronous clocks.
2022-06-15 12:58:02 -04:00
// Connect the GCLK4 to OSC32K via GCLK1 to the DFLL input and for further use.
GCLK->GENDIV.reg = GCLK_GENDIV_ID(4) | GCLK_GENDIV_DIV(1);
GCLK->GENCTRL.reg = GCLK_GENCTRL_GENEN | GCLK_GENCTRL_SRC_XOSC32K | GCLK_GENCTRL_ID(4);
while (GCLK->STATUS.bit.SYNCBUSY) {
}
// Connect GCLK4 to the DFLL input and for further use.
GCLK->CLKCTRL.reg = GCLK_CLKCTRL_ID_DFLL48 | GCLK_CLKCTRL_GEN_GCLK4 | GCLK_CLKCTRL_CLKEN;
samd/clock_config: Split clock_config.c to separate SAMD21/SAMD51 files. And put the file into the mcu directory. The file got a little bit long and hard to read.
2022-06-15 12:49:24 -04:00
// Enable access to the DFLLCTRL reg acc. to Errata 1.2.1
SYSCTRL->DFLLCTRL.reg = SYSCTRL_DFLLCTRL_ENABLE;
while (SYSCTRL->PCLKSR.bit.DFLLRDY == 0) {
}
// Step 2: Set the coarse and fine values.
samd/clock_config: Add HW_DFLL_USB_SYNC and HW_MCU_OSC32KULP extensions. Two new compile flags are: MICROPY_HW_DFLL_USB_SYNC: Effective only if DFLL48 does not run from the crystal. It will synchronize the DFLL48M clock with the USB's SOF pulse. If no USB is connected, it will fall back to open loop mode. The DFLL48M clock is then pretty precise, but with a higher clock jitter at SAMD51 devices. MICROPY_HW_MCU_OSC32KULP: Effective only if the devics uses a crystal as clock source. Run the MCU clock from the ULP 32kHz oszillator instead of the crystal. This flag was added to cater for a interference problem of the crystal and Neopixel/Debug pins at Adafruit FEATHER Mx boards, which causes the board to crash. Drawback: ticks_ms() and time.time() vs. than ticks_us() and the peripherals like PWM run at not synchronous clocks.
2022-06-15 12:58:02 -04:00
// Get the coarse value from the calib data. In case it is not set,
samd/clock_config: Split clock_config.c to separate SAMD21/SAMD51 files. And put the file into the mcu directory. The file got a little bit long and hard to read.
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// set a midrange value.
uint32_t coarse = (*((uint32_t *)FUSES_DFLL48M_COARSE_CAL_ADDR) & FUSES_DFLL48M_COARSE_CAL_Msk)
>> FUSES_DFLL48M_COARSE_CAL_Pos;
if (coarse == 0x3f) {
coarse = 0x1f;
}
SYSCTRL->DFLLVAL.reg = SYSCTRL_DFLLVAL_COARSE(coarse) | SYSCTRL_DFLLVAL_FINE(512);
while (SYSCTRL->PCLKSR.bit.DFLLRDY == 0) {
}
// Step 3: Set the multiplication values. The offset of 16384 to the freq is for rounding.
SYSCTRL->DFLLMUL.reg = SYSCTRL_DFLLMUL_MUL((CPU_FREQ + 16384) / 32768) |
SYSCTRL_DFLLMUL_FSTEP(1) | SYSCTRL_DFLLMUL_CSTEP(1);
while (SYSCTRL->PCLKSR.bit.DFLLRDY == 0) {
}
// Step 4: Start the DFLL and wait for the PLL lock. We just wait for the fine lock, since
// coarse adjusting is bypassed.
samd/clock_config: Add HW_DFLL_USB_SYNC and HW_MCU_OSC32KULP extensions. Two new compile flags are: MICROPY_HW_DFLL_USB_SYNC: Effective only if DFLL48 does not run from the crystal. It will synchronize the DFLL48M clock with the USB's SOF pulse. If no USB is connected, it will fall back to open loop mode. The DFLL48M clock is then pretty precise, but with a higher clock jitter at SAMD51 devices. MICROPY_HW_MCU_OSC32KULP: Effective only if the devics uses a crystal as clock source. Run the MCU clock from the ULP 32kHz oszillator instead of the crystal. This flag was added to cater for a interference problem of the crystal and Neopixel/Debug pins at Adafruit FEATHER Mx boards, which causes the board to crash. Drawback: ticks_ms() and time.time() vs. than ticks_us() and the peripherals like PWM run at not synchronous clocks.
2022-06-15 12:58:02 -04:00
SYSCTRL->DFLLCTRL.reg |= SYSCTRL_DFLLCTRL_MODE | SYSCTRL_DFLLCTRL_WAITLOCK | SYSCTRL_DFLLCTRL_STABLE |
samd/clock_config: Split clock_config.c to separate SAMD21/SAMD51 files. And put the file into the mcu directory. The file got a little bit long and hard to read.
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SYSCTRL_DFLLCTRL_BPLCKC | SYSCTRL_DFLLCTRL_ENABLE;
while (SYSCTRL->PCLKSR.bit.DFLLLCKF == 0) {
}
#else // MICROPY_HW_XOSC32K
// Enable DFLL48M
SYSCTRL->DFLLCTRL.reg = SYSCTRL_DFLLCTRL_ENABLE;
while (!SYSCTRL->PCLKSR.bit.DFLLRDY) {
}
samd/clock_config: Add HW_DFLL_USB_SYNC and HW_MCU_OSC32KULP extensions. Two new compile flags are: MICROPY_HW_DFLL_USB_SYNC: Effective only if DFLL48 does not run from the crystal. It will synchronize the DFLL48M clock with the USB's SOF pulse. If no USB is connected, it will fall back to open loop mode. The DFLL48M clock is then pretty precise, but with a higher clock jitter at SAMD51 devices. MICROPY_HW_MCU_OSC32KULP: Effective only if the devics uses a crystal as clock source. Run the MCU clock from the ULP 32kHz oszillator instead of the crystal. This flag was added to cater for a interference problem of the crystal and Neopixel/Debug pins at Adafruit FEATHER Mx boards, which causes the board to crash. Drawback: ticks_ms() and time.time() vs. than ticks_us() and the peripherals like PWM run at not synchronous clocks.
2022-06-15 12:58:02 -04:00
samd/clock_config: Split clock_config.c to separate SAMD21/SAMD51 files. And put the file into the mcu directory. The file got a little bit long and hard to read.
2022-06-15 12:49:24 -04:00
uint32_t coarse = (*((uint32_t *)FUSES_DFLL48M_COARSE_CAL_ADDR) & FUSES_DFLL48M_COARSE_CAL_Msk)
>> FUSES_DFLL48M_COARSE_CAL_Pos;
if (coarse == 0x3f) {
coarse = 0x1f;
}
samd/clock_config: Add HW_DFLL_USB_SYNC and HW_MCU_OSC32KULP extensions. Two new compile flags are: MICROPY_HW_DFLL_USB_SYNC: Effective only if DFLL48 does not run from the crystal. It will synchronize the DFLL48M clock with the USB's SOF pulse. If no USB is connected, it will fall back to open loop mode. The DFLL48M clock is then pretty precise, but with a higher clock jitter at SAMD51 devices. MICROPY_HW_MCU_OSC32KULP: Effective only if the devics uses a crystal as clock source. Run the MCU clock from the ULP 32kHz oszillator instead of the crystal. This flag was added to cater for a interference problem of the crystal and Neopixel/Debug pins at Adafruit FEATHER Mx boards, which causes the board to crash. Drawback: ticks_ms() and time.time() vs. than ticks_us() and the peripherals like PWM run at not synchronous clocks.
2022-06-15 12:58:02 -04:00
SYSCTRL->DFLLVAL.reg = SYSCTRL_DFLLVAL_COARSE(coarse) | SYSCTRL_DFLLVAL_FINE(511);
#if MICROPY_HW_DFLL_USB_SYNC
// Configure the DFLL48M for USB clock recovery.
// Will have to switch back if no USB
SYSCTRL->DFLLSYNC.bit.READREQ = 1;
dfll48m_calibration = SYSCTRL->DFLLVAL.reg;
// Set the Multiplication factor.
SYSCTRL->DFLLMUL.reg = SYSCTRL_DFLLMUL_CSTEP(1) | SYSCTRL_DFLLMUL_FSTEP(1)
| SYSCTRL_DFLLMUL_MUL(48000);
// Set the mode to closed loop USB Recovery mode
SYSCTRL->DFLLCTRL.reg = SYSCTRL_DFLLCTRL_USBCRM | SYSCTRL_DFLLCTRL_CCDIS
samd/clock_config: Split clock_config.c to separate SAMD21/SAMD51 files. And put the file into the mcu directory. The file got a little bit long and hard to read.
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| SYSCTRL_DFLLCTRL_MODE | SYSCTRL_DFLLCTRL_ENABLE;
samd/clock_config: Add HW_DFLL_USB_SYNC and HW_MCU_OSC32KULP extensions. Two new compile flags are: MICROPY_HW_DFLL_USB_SYNC: Effective only if DFLL48 does not run from the crystal. It will synchronize the DFLL48M clock with the USB's SOF pulse. If no USB is connected, it will fall back to open loop mode. The DFLL48M clock is then pretty precise, but with a higher clock jitter at SAMD51 devices. MICROPY_HW_MCU_OSC32KULP: Effective only if the devics uses a crystal as clock source. Run the MCU clock from the ULP 32kHz oszillator instead of the crystal. This flag was added to cater for a interference problem of the crystal and Neopixel/Debug pins at Adafruit FEATHER Mx boards, which causes the board to crash. Drawback: ticks_ms() and time.time() vs. than ticks_us() and the peripherals like PWM run at not synchronous clocks.
2022-06-15 12:58:02 -04:00
#else
// Set/keep the open loop mode of the device.
SYSCTRL->DFLLCTRL.reg = SYSCTRL_DFLLCTRL_CCDIS | SYSCTRL_DFLLCTRL_ENABLE;
#endif
samd/clock_config: Split clock_config.c to separate SAMD21/SAMD51 files. And put the file into the mcu directory. The file got a little bit long and hard to read.
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while (!SYSCTRL->PCLKSR.bit.DFLLRDY) {
}
samd/clock_config: Add HW_DFLL_USB_SYNC and HW_MCU_OSC32KULP extensions. Two new compile flags are: MICROPY_HW_DFLL_USB_SYNC: Effective only if DFLL48 does not run from the crystal. It will synchronize the DFLL48M clock with the USB's SOF pulse. If no USB is connected, it will fall back to open loop mode. The DFLL48M clock is then pretty precise, but with a higher clock jitter at SAMD51 devices. MICROPY_HW_MCU_OSC32KULP: Effective only if the devics uses a crystal as clock source. Run the MCU clock from the ULP 32kHz oszillator instead of the crystal. This flag was added to cater for a interference problem of the crystal and Neopixel/Debug pins at Adafruit FEATHER Mx boards, which causes the board to crash. Drawback: ticks_ms() and time.time() vs. than ticks_us() and the peripherals like PWM run at not synchronous clocks.
2022-06-15 12:58:02 -04:00
samd/clock_config: Split clock_config.c to separate SAMD21/SAMD51 files. And put the file into the mcu directory. The file got a little bit long and hard to read.
2022-06-15 12:49:24 -04:00
// Enable 32768 Hz on GCLK1 for consistency
GCLK->GENDIV.reg = GCLK_GENDIV_ID(1) | GCLK_GENDIV_DIV(48016384 / 32768);
GCLK->GENCTRL.reg = GCLK_GENCTRL_GENEN | GCLK_GENCTRL_SRC_DFLL48M | GCLK_GENCTRL_ID(1);
while (GCLK->STATUS.bit.SYNCBUSY) {
}
#endif // MICROPY_HW_XOSC32K
// Enable GCLK output: 48M on both CCLK0 and GCLK2
GCLK->GENDIV.reg = GCLK_GENDIV_ID(0) | GCLK_GENDIV_DIV(1);
GCLK->GENCTRL.reg = GCLK_GENCTRL_GENEN | GCLK_GENCTRL_SRC_DFLL48M | GCLK_GENCTRL_ID(0);
while (GCLK->STATUS.bit.SYNCBUSY) {
}
GCLK->GENDIV.reg = GCLK_GENDIV_ID(2) | GCLK_GENDIV_DIV(1);
GCLK->GENCTRL.reg = GCLK_GENCTRL_GENEN | GCLK_GENCTRL_SRC_DFLL48M | GCLK_GENCTRL_ID(2);
while (GCLK->STATUS.bit.SYNCBUSY) {
}
// Enable GCLK output: 1MHz on GCLK3 for TC4
GCLK->GENDIV.reg = GCLK_GENDIV_ID(3) | GCLK_GENDIV_DIV(48);
GCLK->GENCTRL.reg = GCLK_GENCTRL_GENEN | GCLK_GENCTRL_SRC_DFLL48M | GCLK_GENCTRL_ID(3);
while (GCLK->STATUS.bit.SYNCBUSY) {
}
// Set GCLK8 to 1 kHz.
GCLK->GENDIV.reg = GCLK_GENDIV_ID(8) | GCLK_GENDIV_DIV(32);
GCLK->GENCTRL.reg = GCLK_GENCTRL_GENEN | GCLK_GENCTRL_SRC_OSCULP32K | GCLK_GENCTRL_ID(8);
while (GCLK->STATUS.bit.SYNCBUSY) {
}
samd/clock_config: Add HW_DFLL_USB_SYNC and HW_MCU_OSC32KULP extensions. Two new compile flags are: MICROPY_HW_DFLL_USB_SYNC: Effective only if DFLL48 does not run from the crystal. It will synchronize the DFLL48M clock with the USB's SOF pulse. If no USB is connected, it will fall back to open loop mode. The DFLL48M clock is then pretty precise, but with a higher clock jitter at SAMD51 devices. MICROPY_HW_MCU_OSC32KULP: Effective only if the devics uses a crystal as clock source. Run the MCU clock from the ULP 32kHz oszillator instead of the crystal. This flag was added to cater for a interference problem of the crystal and Neopixel/Debug pins at Adafruit FEATHER Mx boards, which causes the board to crash. Drawback: ticks_ms() and time.time() vs. than ticks_us() and the peripherals like PWM run at not synchronous clocks.
2022-06-15 12:58:02 -04:00
samd/clock_config: Split clock_config.c to separate SAMD21/SAMD51 files. And put the file into the mcu directory. The file got a little bit long and hard to read.
2022-06-15 12:49:24 -04:00
}
void enable_sercom_clock(int id) {
// Enable synchronous clock. The bits are nicely arranged
PM->APBCMASK.reg |= 0x04 << id;
// Select multiplexer generic clock source and enable.
GCLK->CLKCTRL.reg = GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK2 | sercom_gclk_id[id];
// Wait while it updates synchronously.
while (GCLK->STATUS.bit.SYNCBUSY) {
}
}
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