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a253e73116
Implemented canboot timer interface. Simplified chipid.c to use common flash interface. Signed-off-by: Alex Malishev <malishev@gmail.com>
57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
// rp2040 timer support
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//
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// Copyright (C) 2021 Kevin O'Connor <kevin@koconnor.net>
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//
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// This file may be distributed under the terms of the GNU GPLv3 license.
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#include "autoconf.h" // CONFIG_CLOCK_FREQ
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#include "board/armcm_boot.h" // armcm_enable_irq
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#include "board/irq.h" // irq_disable
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#include "board/misc.h" // timer_read_time
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#include "hardware/structs/resets.h" // RESETS_RESET_UART0_BITS
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#include "hardware/structs/timer.h" // RESETS_RESET_UART0_BITS
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#include "internal.h" // enable_pclock
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#include "sched.h" // DECL_INIT
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/****************************************************************
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* Low level timer code
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****************************************************************/
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// Return the number of clock ticks for a given number of microseconds
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uint32_t
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timer_from_us(uint32_t us)
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{
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return us * (CONFIG_CLOCK_FREQ / 1000000);
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}
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// Return true if time1 is before time2. Always use this function to
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// compare times as regular C comparisons can fail if the counter
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// rolls over.
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uint8_t
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timer_is_before(uint32_t time1, uint32_t time2)
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{
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return (int32_t)(time1 - time2) < 0;
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}
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// Return the current time (in absolute clock ticks).
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uint32_t
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timer_read_time(void)
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{
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return timer_hw->timerawl;
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}
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/****************************************************************
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* Setup and irqs
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****************************************************************/
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void
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timer_setup(void)
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{
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irq_disable();
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enable_pclock(RESETS_RESET_TIMER_BITS);
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timer_hw->timelw = 0;
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timer_hw->timehw = 0;
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irq_enable();
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}
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