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Diffstat (limited to 'Marlin/src/HAL/DUE/timers.cpp')
| -rw-r--r-- | Marlin/src/HAL/DUE/timers.cpp | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/Marlin/src/HAL/DUE/timers.cpp b/Marlin/src/HAL/DUE/timers.cpp new file mode 100644 index 0000000..65073c5 --- /dev/null +++ b/Marlin/src/HAL/DUE/timers.cpp @@ -0,0 +1,132 @@ +/** + * Marlin 3D Printer Firmware + * + * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin] + * Copyright (c) 2016 Bob Cousins bobcousins42@googlemail.com + * Copyright (c) 2015-2016 Nico Tonnhofer wurstnase.reprap@gmail.com + * + * 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 <https://www.gnu.org/licenses/>. + * + */ + +/** + * HAL Timers for Arduino Due and compatible (SAM3X8E) + */ + +#ifdef ARDUINO_ARCH_SAM + +// ------------------------ +// Includes +// ------------------------ +#include "../../inc/MarlinConfig.h" +#include "HAL.h" + +// ------------------------ +// Local defines +// ------------------------ + +#define NUM_HARDWARE_TIMERS 9 + +// ------------------------ +// Private Variables +// ------------------------ + +const tTimerConfig TimerConfig [NUM_HARDWARE_TIMERS] = { + { TC0, 0, TC0_IRQn, 3}, // 0 - [servo timer5] + { TC0, 1, TC1_IRQn, 0}, // 1 + { TC0, 2, TC2_IRQn, 2}, // 2 - stepper + { TC1, 0, TC3_IRQn, 0}, // 3 - stepper for BOARD_ARCHIM1 + { TC1, 1, TC4_IRQn, 15}, // 4 - temperature + { TC1, 2, TC5_IRQn, 3}, // 5 - [servo timer3] + { TC2, 0, TC6_IRQn, 14}, // 6 - tone + { TC2, 1, TC7_IRQn, 0}, // 7 + { TC2, 2, TC8_IRQn, 0}, // 8 +}; + +// ------------------------ +// Public functions +// ------------------------ + +/* + Timer_clock1: Prescaler 2 -> 42MHz + Timer_clock2: Prescaler 8 -> 10.5MHz + Timer_clock3: Prescaler 32 -> 2.625MHz + Timer_clock4: Prescaler 128 -> 656.25kHz +*/ + +void HAL_timer_start(const uint8_t timer_num, const uint32_t frequency) { + Tc *tc = TimerConfig[timer_num].pTimerRegs; + IRQn_Type irq = TimerConfig[timer_num].IRQ_Id; + uint32_t channel = TimerConfig[timer_num].channel; + + // Disable interrupt, just in case it was already enabled + 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(); + + // Disable timer interrupt + tc->TC_CHANNEL[channel].TC_IDR = TC_IDR_CPCS; + + // Stop timer, just in case, to be able to reconfigure it + TC_Stop(tc, channel); + + pmc_set_writeprotect(false); + pmc_enable_periph_clk((uint32_t)irq); + NVIC_SetPriority(irq, TimerConfig [timer_num].priority); + + // wave mode, reset counter on match with RC, + TC_Configure(tc, channel, TC_CMR_WAVE | TC_CMR_WAVSEL_UP_RC | TC_CMR_TCCLKS_TIMER_CLOCK1); + + // Set compare value + TC_SetRC(tc, channel, VARIANT_MCK / 2 / frequency); + + // And start timer + TC_Start(tc, channel); + + // enable interrupt on RC compare + tc->TC_CHANNEL[channel].TC_IER = TC_IER_CPCS; + + // 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; + 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(); +} + +// missing from CMSIS: Check if interrupt is enabled or not +static bool NVIC_GetEnabledIRQ(IRQn_Type IRQn) { + return TEST(NVIC->ISER[uint32_t(IRQn) >> 5], uint32_t(IRQn) & 0x1F); +} + +bool HAL_timer_interrupt_enabled(const uint8_t timer_num) { + IRQn_Type irq = TimerConfig[timer_num].IRQ_Id; + return NVIC_GetEnabledIRQ(irq); +} + +#endif // ARDUINO_ARCH_SAM |