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1a88f0bad6
Add ATxmega common files and cpu definitions. This works was originally developed by @Josar. The 2018 version were port to 2021 mainline. This version changes original port to have only the atxmega CPU definition. With that, all family can be accomodated. Signed-off-by: Gerson Fernando Budke <nandojve@gmail.com>
76 lines
2.0 KiB
C
76 lines
2.0 KiB
C
/*
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* Copyright (C) 2021 Gerson Fernando Budke <nandojve@gmail.com>
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup cpu_atxmega
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* @brief Common implementations and headers for ATxmega family based micro-controllers
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* @{
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*
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* @file
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* @brief Basic definitions for the ATxmega common clock module
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*
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* When ever you want to do something hardware related, that is accessing MCUs registers directly,
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* just include this file. It will then make sure that the MCU specific headers are included.
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*
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* @author Gerson Fernando Budke <nandojve@gmail.com>
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*
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*/
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#ifndef CPU_CLOCK_H
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#define CPU_CLOCK_H
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief ATxmega system clock prescaler settings
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*
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* Some CPUs may not support the highest prescaler settings
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*/
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enum {
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CPU_ATXMEGA_CLK_SCALE_DIV1 = 0,
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CPU_ATXMEGA_CLK_SCALE_DIV2 = 1,
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CPU_ATXMEGA_CLK_SCALE_DIV4 = 3,
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CPU_ATXMEGA_CLK_SCALE_DIV8 = 5,
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CPU_ATXMEGA_CLK_SCALE_DIV16 = 7,
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CPU_ATXMEGA_CLK_SCALE_DIV32 = 9,
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CPU_ATXMEGA_CLK_SCALE_DIV64 = 11,
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CPU_ATXMEGA_CLK_SCALE_DIV128 = 13,
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CPU_ATXMEGA_CLK_SCALE_DIV256 = 15,
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CPU_ATXMEGA_CLK_SCALE_DIV512 = 17,
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};
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enum {
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CPU_ATXMEGA_BUS_SCALE_DIV1_1 = 0,
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CPU_ATXMEGA_BUS_SCALE_DIV1_2 = 1,
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CPU_ATXMEGA_BUS_SCALE_DIV4_1 = 2,
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CPU_ATXMEGA_BUS_SCALE_DIV2_2 = 3,
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};
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/**
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* @brief Initializes system clock prescaler
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*/
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static inline void atxmega_set_prescaler(uint8_t clk_scale, uint8_t bus_scale)
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{
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/* Disable CCP for Protected IO register and set new value
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* Set system clock prescalers to zero. PSCTRL contains A Prescaler
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* Value and one value for and B and C Prescaler
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*/
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_PROTECTED_WRITE(CLK.PSCTRL, clk_scale | bus_scale);
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* CPU_CLOCK_H */
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/** @} */
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