periph_cpu_common.h
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/*
* Copyright (C) 2015 HAW Hamburg
* 2016 Freie Universität Berlin
* 2016 INRIA
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup cpu_atmega_common
* @{
*
* @file
* @brief CPU specific definitions for internal peripheral handling
*
* @author René Herthel <rene-herthel@outlook.de>
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
* @author Francisco Acosta <francisco.acosta@inria.fr>
*/
#ifndef PERIPH_CPU_COMMON_H_
#define PERIPH_CPU_COMMON_H_
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Define a CPU specific GPIO pin generator macro
*/
#define GPIO_PIN(x, y) ((x << 4) | y)
/**
* @brief SPI mode select macro
*
* The polarity is determined by bit 3 in the configuration register, the phase
* by bit 2.
*/
#define SPI_MODE_SEL(pol, pha) ((pol << 3) | (pha << 2))
/**
* @brief Override the SPI mode values
*
* As the mode is set in bit 3 and 2 of the configuration register, we put the
* correct configuration there
* @{
*/
#define HAVE_SPI_CONF_T
typedef enum {
SPI_CONF_FIRST_RISING = SPI_MODE_SEL(0, 0), /**< mode 0 */
SPI_CONF_SECOND_RISING = SPI_MODE_SEL(0, 1), /**< mode 1 */
SPI_CONF_FIRST_FALLING = SPI_MODE_SEL(1, 0), /**< mode 2 */
SPI_CONF_SECOND_FALLING = SPI_MODE_SEL(1, 1) /**< mode 3 */
} spi_conf_t;
/** @} */
/**
* @brief SPI speed selection macro
*
* We encode the speed in bits 2, 1, and 0, where bit0 and bit1 hold the SPCR
* prescaler bits, while bit2 holds the SPI2X bit.
*/
#define SPI_SPEED_SEL(s2x, pr1, pr0) ((s2x << 2) | (pr1 << 1) | pr0)
/**
* @brief Override SPI speed values
*
* We assume a master clock speed of 16MHz here.
* @{
*/
#define HAVE_SPI_SPEED_T
typedef enum {
SPI_SPEED_100KHZ = SPI_SPEED_SEL(0, 1, 1), /**< 16/128 -> 125KHz */
SPI_SPEED_400KHZ = SPI_SPEED_SEL(1, 1, 0), /**< 16/32 -> 500KHz */
SPI_SPEED_1MHZ = SPI_SPEED_SEL(0, 0, 1), /**< 16/16 -> 1MHz */
SPI_SPEED_5MHZ = SPI_SPEED_SEL(0, 0, 0), /**< 16/4 -> 4MHz */
SPI_SPEED_10MHZ = SPI_SPEED_SEL(1, 0, 0) /**< 16/2 -> 8MHz */
} spi_speed_t;
/** @} */
#ifdef __cplusplus
}
#endif
#endif /* PERIPH_CPU_COMMON_H_ */
/** @} */