mirror of
https://github.com/halleysfifthinc/AVCLAN-Mockingboard.git
synced 2026-08-11 16:32:52 +00:00
Allen Hill
67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
#ifndef _TIMING_HPP_
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#define _TIMING_HPP_
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#define __CLKCTRL_PDIV_2X_gc 2
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#define __CLKCTRL_PDIV_4X_gc 4
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#define __CLKCTRL_PDIV_8X_gc 8
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#define __CLKCTRL_PDIV_16X_gc 16
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#define __CLKCTRL_PDIV_32X_gc 32
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#define __CLKCTRL_PDIV_64X_gc 64
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#define __CLKCTRL_PDIV_6X_gc 6
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#define __CLKCTRL_PDIV_10X_gc 10
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#define __CLKCTRL_PDIV_12X_gc 12
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#define __CLKCTRL_PDIV_24X_gc 24
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#define __CLKCTRL_PDIV_48X_gc 48
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#if CLK_PRESCALE == 0x01
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#define F_CPU (FREQSEL / __CLK_PRESCALE_DIV)
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#define CYCLE_MUL __CLK_PRESCALE_DIV
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#else
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#define F_CPU (FREQSEL)
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#define CYCLE_MUL 1
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#endif
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#if FREQSEL == 20000000L
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#define CPU_CYCLE (50 * CYCLE_MUL)
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#elif FREQSEL == 16000000L
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#define CPU_CYCLE (62.5 * CYCLE_MUL)
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#else
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#error "Not implemented"
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#endif
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#ifndef TCB_CLKSEL_CLKDIV1_gc
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#define TCB_CLKSEL_CLKDIV1_gc (0x00 << 1)
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#endif
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#ifndef TCB_CLKSEL_CLKDIV2_gc
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#define TCB_CLKSEL_CLKDIV2_gc (0x01 << 1)
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#endif
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#ifndef TCB_CLKSEL_CLKTCA_gc
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#define TCB_CLKSEL_CLKTCA_gc (0x02 << 1)
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#endif
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#if TCB_CLKSEL == TCB_CLKSEL_CLKDIV1_gc
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#define TCB_TICK (CPU_CYCLE)
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#elif TCB_CLKSEL == TCB_CLKSEL_CLKDIV2_gc
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#define TCB_TICK (CPU_CYCLE * 2)
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#elif TCB_CLKSEL == TCB_CLKSEL_CLKTCA_gc
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#error "Not implemented"
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#endif
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// Measured at ±0.02 μs @ F_CPU=20MHz, TCB_CLKSEL=TCB_CLKSEL_CLKDIV1_gc
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#define AVCLAN_STARTBIT_LOGIC_0 (169e3 / TCB_TICK)
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#define AVCLAN_STARTBIT_LOGIC_1 (20.6e3 / TCB_TICK)
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#define AVCLAN_BIT1_LOGIC_0 (19.7e3 / TCB_TICK)
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#define AVCLAN_BIT1_LOGIC_1 (18.1e3 / TCB_TICK)
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#define AVCLAN_BIT0_LOGIC_0 (32.85e3 / TCB_TICK)
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#define AVCLAN_BIT0_LOGIC_1 (6.2e3 / TCB_TICK)
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#define AVCLAN_READBIT_THRESHOLD (26e3 / TCB_TICK)
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#define AVCLAN_BIT_LENGTH_MAX (39.1e3 / TCB_TICK)
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#endif
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