periph_cpu.h
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/*
* Copyright (C) 2015-2017 Freie Universität Berlin
*
* 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_nrf51
* @{
*
* @file
* @brief nRF51 specific definitions for handling peripherals
*
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
*/
#ifndef PERIPH_CPU_H
#define PERIPH_CPU_H
#include "periph_cpu_common.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief System core clock speed, fixed to 16MHz for all NRF51x CPUs
*/
#define CLOCK_CORECLOCK (16000000U)
/**
* @brief Redefine some peripheral names to unify them between nRF51 and 52
* @{
*/
#define UART_IRQN (UART0_IRQn)
#define SPI_SCKSEL (dev(bus)->PSELSCK)
#define SPI_MOSISEL (dev(bus)->PSELMOSI)
#define SPI_MISOSEL (dev(bus)->PSELMISO)
/** @} */
/**
* @brief Override I2C speed settings
* @{
*/
#define HAVE_I2C_SPEED_T
typedef enum {
I2C_SPEED_LOW = 0x01, /**< not supported */
I2C_SPEED_NORMAL = TWI_FREQUENCY_FREQUENCY_K100, /**< 100kbit/s */
I2C_SPEED_FAST = TWI_FREQUENCY_FREQUENCY_K400, /**< 400kbit/s */
I2C_SPEED_FAST_PLUS = 0x02, /**< not supported */
I2C_SPEED_HIGH = 0x03, /**< not supported */
} i2c_speed_t;
/** @} */
/**
* @brief I2C (TWI) configuration options
*/
typedef struct {
NRF_TWI_Type *dev; /**< hardware device */
uint8_t pin_scl; /**< SCL pin */
uint8_t pin_sda; /**< SDA pin */
uint8_t ppi; /**< PPI channel to use */
} i2c_conf_t;
#ifdef __cplusplus
}
#endif
#endif /* PERIPH_CPU_H */
/** @} */