mirror of
https://github.com/halleysfifthinc/AVCLAN-Mockingboard.git
synced 2026-08-11 08:22:52 +00:00
Allen Hill
67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
// Copyright (C) 2015 Allen Hill <allenofthehills@gmail.com>
|
|
// SPDX-License-Identifier: GPL-3.0-or-later
|
|
|
|
#pragma once
|
|
|
|
// AVR ATtiny3216 timing parameters. Derives F_CPU (needed by avr-libc, e.g.
|
|
// util/delay.h) and the bus-timer (TCB) tick period from the CMake-provided
|
|
// FREQSEL / CLK_PRESCALE / TCB_CLKSEL, then hands the generic timing.h a
|
|
// TICK_US (microseconds per TCB tick) so the physical bit-phase durations
|
|
// resolve to TCB-tick counts. TICK_US == TCB_TICK / 1000, so every derived
|
|
// constant is numerically identical to the previous F_CPU/TCB_CLKSEL
|
|
// formulation.
|
|
|
|
#define __CLKCTRL_PDIV_2X_gc 2
|
|
#define __CLKCTRL_PDIV_4X_gc 4
|
|
#define __CLKCTRL_PDIV_8X_gc 8
|
|
#define __CLKCTRL_PDIV_16X_gc 16
|
|
#define __CLKCTRL_PDIV_32X_gc 32
|
|
#define __CLKCTRL_PDIV_64X_gc 64
|
|
#define __CLKCTRL_PDIV_6X_gc 6
|
|
#define __CLKCTRL_PDIV_10X_gc 10
|
|
#define __CLKCTRL_PDIV_12X_gc 12
|
|
#define __CLKCTRL_PDIV_24X_gc 24
|
|
#define __CLKCTRL_PDIV_48X_gc 48
|
|
|
|
#if CLK_PRESCALE == 0x01
|
|
#define F_CPU (FREQSEL / __CLK_PRESCALE_DIV)
|
|
#define CYCLE_MUL __CLK_PRESCALE_DIV
|
|
#else
|
|
#define F_CPU (FREQSEL)
|
|
#define CYCLE_MUL 1
|
|
#endif
|
|
|
|
// CPU_CYCLE / TCB_TICK are in nanoseconds.
|
|
#if FREQSEL == 20000000L
|
|
#define CPU_CYCLE (50 * CYCLE_MUL)
|
|
#elif FREQSEL == 16000000L
|
|
#define CPU_CYCLE (62.5 * CYCLE_MUL)
|
|
#else
|
|
#error "Not implemented"
|
|
#endif
|
|
|
|
#ifndef TCB_CLKSEL_CLKDIV1_gc
|
|
#define TCB_CLKSEL_CLKDIV1_gc (0x00 << 1)
|
|
#endif
|
|
|
|
#ifndef TCB_CLKSEL_CLKDIV2_gc
|
|
#define TCB_CLKSEL_CLKDIV2_gc (0x01 << 1)
|
|
#endif
|
|
|
|
#ifndef TCB_CLKSEL_CLKTCA_gc
|
|
#define TCB_CLKSEL_CLKTCA_gc (0x02 << 1)
|
|
#endif
|
|
|
|
#if TCB_CLKSEL == TCB_CLKSEL_CLKDIV1_gc
|
|
#define TCB_TICK (CPU_CYCLE)
|
|
#elif TCB_CLKSEL == TCB_CLKSEL_CLKDIV2_gc
|
|
#define TCB_TICK (CPU_CYCLE * 2)
|
|
#elif TCB_CLKSEL == TCB_CLKSEL_CLKTCA_gc
|
|
#error "Not implemented"
|
|
#endif
|
|
|
|
// TCB_TICK is nanoseconds/tick; the generic timing.h wants microseconds/tick.
|
|
#define TICK_US (TCB_TICK / 1000.0)
|
|
|
|
#include "timing.h"
|