68 lines
1.2 KiB
C
68 lines
1.2 KiB
C
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/*
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* Copyright 2022 NXP
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* Common utility functions for SD subsystem
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*/
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#ifndef ZEPHYR_SUBSYS_SD_UTILS_H_
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#define ZEPHYR_SUBSYS_SD_UTILS_H_
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#include <zephyr/zephyr.h>
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#include <zephyr/sd/sd.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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* Custom SD return codes. Used internally to indicate conditions that may
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* not be errors, but are abnormal return conditions
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*/
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enum sd_return_codes {
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SD_RETRY = 1,
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SD_NOT_SDIO = 2,
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SD_RESTART = 3,
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};
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/* Delay function for SD subsystem */
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static inline void sd_delay(unsigned int millis)
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{
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k_msleep(millis);
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}
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/*
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* Helper function to retry sending command to SD card
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* Will retry command if return code equals SD_RETRY
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*/
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static inline int sd_retry(int(*cmd)(struct sd_card *card),
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struct sd_card *card,
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int retries)
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{
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int ret = -ETIMEDOUT;
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while (retries-- >= 0) {
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/* Try cmd */
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ret = cmd(card);
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/**
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* Functions have 3 possible responses:
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* 0: success
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* SD_RETRY: retry command
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* other: does not retry
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*/
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if (ret != SD_RETRY) {
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break;
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}
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}
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return ret == SD_RETRY ? -ETIMEDOUT : ret;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* ZEPHYR_SUBSYS_SD_UTILS_H_ */
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