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113 lines
2.8 KiB
C
113 lines
2.8 KiB
C
/*
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* Copyright (C) 2015-2016 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_samd21
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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 Hauke Petersen <hauke.petersen@fu-berlin.de>
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*/
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#ifndef CPU_PERIPH_H
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#define CPU_PERIPH_H
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#include "periph_cpu_common.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 Available ports on the SAMD21
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*/
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enum {
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PA = 0, /**< port A */
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PB = 1, /**< port B */
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PC = 2, /**< port C */
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};
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/**
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* @brief Generate GPIO mode bitfields
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*
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* We use 3 bit to determine the pin functions:
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* - bit 0: PD(0) or PU(1)
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* - bit 1: input enable
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* - bit 2: pull enable
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*/
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#define GPIO_MODE(pr, ie, pe) (pr | (ie << 1) | (pe << 2))
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#ifndef DOXYGEN
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/**
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* @brief Override GPIO modes
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* @{
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*/
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#define HAVE_GPIO_MODE_T
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typedef enum {
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GPIO_IN = GPIO_MODE(0, 1, 0), /**< IN */
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GPIO_IN_PD = GPIO_MODE(0, 1, 1), /**< IN with pull-down */
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GPIO_IN_PU = GPIO_MODE(1, 1, 1), /**< IN with pull-up */
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GPIO_OUT = GPIO_MODE(0, 0, 0), /**< OUT (push-pull) */
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GPIO_OD = 0xfe, /**< not supported by HW */
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GPIO_OD_PU = 0xff /**< not supported by HW */
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} gpio_mode_t;
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/** @} */
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#endif /* ndef DOXYGEN */
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/**
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* @brief PWM channel configuration data structure
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*/
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typedef struct {
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gpio_t pin; /**< GPIO pin */
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gpio_mux_t mux; /**< pin function multiplex value */
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uint8_t chan; /**< TCC channel to use */
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} pwm_conf_chan_t;
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/**
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* @brief PWM device configuration data structure
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*/
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typedef struct {
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Tcc *dev; /**< TCC device to use */
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pwm_conf_chan_t chan[3]; /**< channel configuration */
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} pwm_conf_t;
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/**
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* @brief UART device configuration
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*/
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typedef struct {
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SercomUsart *dev; /**< pointer to the used UART device */
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gpio_t rx_pin; /**< pin used for RX */
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gpio_t tx_pin; /**< pin used for TX */
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gpio_mux_t mux; /**< alternative function for pins */
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uart_rxpad_t rx_pad; /**< pad selection for RX line */
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uart_txpad_t tx_pad; /**< pad selection for TX line */
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} uart_conf_t;
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/**
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* @brief Return the numeric id of a SERCOM device derived from its address
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*
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* @param[in] sercom SERCOM device
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*
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* @return numeric id of the given SERCOM device
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*/
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static inline int _sercom_id(SercomUsart *sercom)
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{
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return ((((uint32_t)sercom) >> 10) & 0x7) - 2;
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}
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#define PM_NUM_MODES (3)
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#ifdef __cplusplus
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}
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#endif
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#endif /* CPU_PERIPH_H */
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/** @} */
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