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104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
/*
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* Copyright (C) 2015 HAW Hamburg
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* 2016 Freie Universität Berlin
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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_atmega2560
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* @{
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*
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* @file
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* @brief CPU specific definitions for internal peripheral handling
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*
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* @author René Herthel <rene-herthel@outlook.de>
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* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
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*/
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#ifndef PERIPH_CPU_H_
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#define PERIPH_CPU_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 Define a CPU specific GPIO pin generator macro
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*/
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#define GPIO_PIN(x, y) ((x << 4) | y)
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/**
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* @brief Available ports on the ATmega2560 family
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*/
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enum {
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PORT_A = 0, /**< port A */
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PORT_B = 1, /**< port B */
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PORT_C = 2, /**< port C */
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PORT_D = 3, /**< port D */
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PORT_E = 4, /**< port E */
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PORT_F = 5, /**< port F */
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PORT_G = 6, /**< port G */
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PORT_H = 7, /**< port H */
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PORT_J = 8, /**< port J */
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PORT_K = 9, /**< port K */
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PORT_L = 10 /**< port L */
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};
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/**
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* @brief SPI mode select macro
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*
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* The polarity is determined by bit 3 in the configuration register, the phase
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* by bit 2.
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*/
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#define SPI_MODE_SEL(pol, pha) ((pol << 3) | (pha << 2))
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/**
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* @brief Override the SPI mode values
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*
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* As the mode is set in bit 3 and 2 of the configuration register, we put the
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* correct configuration there
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* @{
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*/
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#define HAVE_SPI_CONF_T
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typedef enum {
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SPI_CONF_FIRST_RISING = SPI_MODE_SEL(0, 0), /**< mode 0 */
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SPI_CONF_SECOND_RISING = SPI_MODE_SEL(0, 1), /**< mode 1 */
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SPI_CONF_FIRST_FALLING = SPI_MODE_SEL(1, 0), /**< mode 2 */
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SPI_CONF_SECOND_FALLING = SPI_MODE_SEL(1, 1) /**< mode 3 */
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} spi_conf_t;
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/** @} */
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/**
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* @brief SPI speed selection macro
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*
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* We encode the speed in bits 2, 1, and 0, where bit0 and bit1 hold the SPCR
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* prescaler bits, while bit2 holds the SPI2X bit.
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*/
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#define SPI_SPEED_SEL(s2x, pr1, pr0) ((s2x << 2) | (pr1 << 1) | pr0)
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/**
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* @brief Override SPI speed values
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*
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* We assume a master clock speed of 16MHz here.
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* @{
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*/
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#define HAVE_SPI_SPEED_T
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typedef enum {
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SPI_SPEED_100KHZ = SPI_SPEED_SEL(0, 1, 1), /**< 16/128 -> 125KHz */
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SPI_SPEED_400KHZ = SPI_SPEED_SEL(1, 1, 0), /**< 16/32 -> 500KHz */
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SPI_SPEED_1MHZ = SPI_SPEED_SEL(0, 0, 1), /**< 16/16 -> 1MHz */
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SPI_SPEED_5MHZ = SPI_SPEED_SEL(0, 0, 0), /**< 16/4 -> 4MHz */
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SPI_SPEED_10MHZ = SPI_SPEED_SEL(1, 0, 0) /**< 16/2 -> 8MHz */
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} spi_speed_t;
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/** @} */
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#ifdef __cplusplus
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}
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#endif
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#endif /* PERIPH_CPU_H_ */
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/** @} */
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