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- /**
- * Marlin 3D Printer Firmware
- *
- * Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
- * SAMD51 HAL developed by Giuliano Zaro (AKA GMagician)
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- *
- */
-
- #ifdef __SAMD51__
-
- // --------------------------------------------------------------------------
- // Includes
- // --------------------------------------------------------------------------
- #include "../../inc/MarlinConfig.h"
- #include "HAL_timers_SAMD51.h"
-
- // --------------------------------------------------------------------------
- // Local defines
- // --------------------------------------------------------------------------
-
- #define NUM_HARDWARE_TIMERS 8
-
- // --------------------------------------------------------------------------
- // Private Variables
- // --------------------------------------------------------------------------
-
- const tTimerConfig TimerConfig[NUM_HARDWARE_TIMERS] = {
- { TC0, TC0_IRQn, TC_PRIORITY(0) },
- { TC1, TC1_IRQn, TC_PRIORITY(1) },
- { TC2, TC2_IRQn, TC_PRIORITY(2) },
- { TC3, TC3_IRQn, TC_PRIORITY(3) },
- { TC4, TC4_IRQn, TC_PRIORITY(4) },
- { TC5, TC5_IRQn, TC_PRIORITY(5) },
- { TC6, TC6_IRQn, TC_PRIORITY(6) },
- { TC7, TC7_IRQn, TC_PRIORITY(7) }
- };
-
- // --------------------------------------------------------------------------
- // Private functions
- // --------------------------------------------------------------------------
-
- FORCE_INLINE void Disable_Irq(IRQn_Type irq) {
- NVIC_DisableIRQ(irq);
-
- // We NEED memory barriers to ensure Interrupts are actually disabled!
- // ( https://dzone.com/articles/nvic-disabling-interrupts-on-arm-cortex-m-and-the )
- __DSB();
- __ISB();
- }
-
- // --------------------------------------------------------------------------
- // Public functions
- // --------------------------------------------------------------------------
-
- void HAL_timer_start(const uint8_t timer_num, const uint32_t frequency) {
- Tc * const tc = TimerConfig[timer_num].pTimer;
- IRQn_Type irq = TimerConfig[timer_num].IRQ_Id;
-
- // Disable interrupt, just in case it was already enabled
- Disable_Irq(irq);
-
- // Disable timer interrupt
- tc->COUNT32.INTENCLR.reg = TC_INTENCLR_OVF; // disable overflow interrupt
-
- // TCn clock setup
- const uint8_t clockID = GCLK_CLKCTRL_IDs[TCC_INST_NUM + timer_num];
- GCLK->PCHCTRL[clockID].bit.CHEN = false;
- SYNC(GCLK->PCHCTRL[clockID].bit.CHEN);
- GCLK->PCHCTRL[clockID].reg = GCLK_PCHCTRL_GEN_GCLK0 | GCLK_PCHCTRL_CHEN; // 120MHz startup code programmed
- SYNC(!GCLK->PCHCTRL[clockID].bit.CHEN);
-
- // Stop timer, just in case, to be able to reconfigure it
- tc->COUNT32.CTRLA.bit.ENABLE = false;
- SYNC(tc->COUNT32.SYNCBUSY.bit.ENABLE);
-
- // Reset timer
- tc->COUNT32.CTRLA.bit.SWRST = true;
- SYNC(tc->COUNT32.SYNCBUSY.bit.SWRST);
-
- NVIC_SetPriority(irq, TimerConfig[timer_num].priority);
-
- // Wave mode, reset counter on overflow on 0 (I use count down to prevent double buffer use)
- tc->COUNT32.WAVE.reg = TC_WAVE_WAVEGEN_MFRQ;
- tc->COUNT32.CTRLA.reg = TC_CTRLA_MODE_COUNT32 | TC_CTRLA_PRESCALER_DIV1;
- tc->COUNT32.CTRLBSET.reg = TC_CTRLBCLR_DIR;
- SYNC(tc->COUNT32.SYNCBUSY.bit.CTRLB);
-
- // Set compare value
- tc->COUNT32.COUNT.reg = tc->COUNT32.CC[0].reg = HAL_TIMER_RATE / frequency;
-
- // And start timer
- tc->COUNT32.CTRLA.bit.ENABLE = true;
- SYNC(tc->COUNT32.SYNCBUSY.bit.ENABLE);
-
- // Enable interrupt on RC compare
- tc->COUNT32.INTENSET.reg = TC_INTENCLR_OVF; // enable overflow interrupt
-
- // Finally, enable IRQ
- NVIC_EnableIRQ(irq);
- }
-
- void HAL_timer_enable_interrupt(const uint8_t timer_num) {
- IRQn_Type irq = TimerConfig[timer_num].IRQ_Id;
- NVIC_EnableIRQ(irq);
- }
-
- void HAL_timer_disable_interrupt(const uint8_t timer_num) {
- IRQn_Type irq = TimerConfig[timer_num].IRQ_Id;
- Disable_Irq(irq);
- }
-
- // missing from CMSIS: Check if interrupt is enabled or not
- static bool NVIC_GetEnabledIRQ(IRQn_Type IRQn) {
- return (NVIC->ISER[(uint32_t)(IRQn) >> 5] & (1 << ((uint32_t)(IRQn) & 0x1F))) != 0;
- }
-
- bool HAL_timer_interrupt_enabled(const uint8_t timer_num) {
- IRQn_Type irq = TimerConfig[timer_num].IRQ_Id;
- return NVIC_GetEnabledIRQ(irq);
- }
-
- #endif // __SAMD51__
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