mirror of
https://github.com/Klipper3d/klipper.git
synced 2025-12-29 10:50:27 -07:00
c7330e07a4
* Copyright in log.c * GPIO check completely removed * generic/timer_irq added * Change in doc section Signed-off-by: Eugene Krashtan <eug.krashtan@gmail.com>
85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
/*
|
|
* Timer and PWM functions for STM32F042 boards.
|
|
* Also replacement for 'generic/armcm_timer.c', which not compatible
|
|
* with Cortex-M0 CPUs
|
|
*
|
|
* Copyright (C) 2019 Eug Krashtan <eug.krashtan@gmail.com>
|
|
* This file may be distributed under the terms of the GNU GPLv3 license.
|
|
*
|
|
* DO NOT USE HAL! (Timer HAL extremely fat)
|
|
*/
|
|
|
|
#include "autoconf.h" // CONFIG_CLOCK_FREQ
|
|
#include "board/internal.h" // SysTick
|
|
#include "board/irq.h" // irq_disable
|
|
#include "stm32f0xx.h"
|
|
#include "log.h"
|
|
#include "sched.h" // DECL_INIT
|
|
#include "command.h" // shutdown
|
|
#include "board/timer_irq.h" // timer_dispatch_many
|
|
|
|
// Set the next irq time
|
|
static void
|
|
timer_set_diff(uint32_t value)
|
|
{
|
|
SysTick->LOAD = value & SysTick_LOAD_RELOAD_Msk;
|
|
SysTick->VAL = 0;
|
|
SysTick->LOAD = 0;
|
|
}
|
|
|
|
// Activate timer dispatch as soon as possible
|
|
void
|
|
timer_kick(void)
|
|
{
|
|
SysTick->LOAD = 0;
|
|
SysTick->VAL = 0;
|
|
SCB->ICSR = SCB_ICSR_PENDSTSET_Msk;
|
|
}
|
|
|
|
/*
|
|
* TIM2 (32bit) used instead of DWT->CYCCNT in original variant
|
|
*/
|
|
void TimerInit(void)
|
|
{
|
|
RCC->APB1ENR |= RCC_APB1ENR_TIM2EN;
|
|
|
|
TIM2->PSC = 0;
|
|
//TIM2->ARR = 0xFFFFFFFF; reset value
|
|
TIM2->DIER = TIM_DIER_UIE;
|
|
TIM2->CR1 = TIM_CR1_CEN;
|
|
|
|
NVIC_EnableIRQ(TIM2_IRQn);
|
|
|
|
// Enable SysTick
|
|
irqstatus_t flag = irq_save();
|
|
NVIC_SetPriority(SysTick_IRQn, 2);
|
|
SysTick->CTRL = (SysTick_CTRL_CLKSOURCE_Msk | SysTick_CTRL_TICKINT_Msk
|
|
| SysTick_CTRL_ENABLE_Msk);
|
|
timer_kick();
|
|
irq_restore(flag);
|
|
|
|
}
|
|
DECL_INIT(TimerInit);
|
|
|
|
uint32_t
|
|
timer_read_time(void)
|
|
{
|
|
return TIM2->CNT;
|
|
}
|
|
|
|
// IRQ handler
|
|
void __visible __aligned(16) // aligning helps stabilize perf benchmarks
|
|
SysTick_Handler(void)
|
|
{
|
|
irq_disable();
|
|
uint32_t next = timer_dispatch_many();
|
|
timer_set_diff(next-timer_read_time());
|
|
irq_enable();
|
|
}
|
|
|
|
void TIM2_IRQHandler(void)
|
|
{
|
|
if(TIM2->SR & TIM_SR_UIF) {
|
|
TIM2->SR &= ~TIM_SR_UIF; // clear UIF flag
|
|
}
|
|
}
|