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EEPROM API 参考

EEPROM

struct wm_drv_eeprom_ops_t

instance api types

Public Members

int (*init)(wm_device_t *device): initialize

int (*deinit)(wm_device_t *device): deinitialize

int (*read)(wm_device_t *device, uint32_t offset, void *buf, uint32_t read_size): read

int (*write)(wm_device_t *device, uint32_t offset, const void *data, uint32_t size): write

int (*get_size)(wm_device_t *device): get eeprom size

int (*set_wp)(wm_device_t *device, bool on): set write protection

wm_device_t *wm_drv_eeprom_init(const char *eeprom_dev_name)

eeprom drvier initialize

参数:

eeprom_dev_name – [in] The eeprom name, defined in device table

返回:

!0 : eeprom device, return previous handle if called twice
NULL: fail

int wm_drv_eeprom_deinit(wm_device_t *eeprom_device)

eeprom drvier deinitialize

参数:

eeprom_device – [in] eeprom device,type of wm_device_t *

返回:

WM_ERR_SUCCESS : deinitialize ok
WM_ERR_INVALID_PARAM: bad param

int wm_drv_eeprom_read(wm_device_t *eeprom_device, uint32_t offset, void *buf, uint32_t len)

read data from eeprom device

参数:

eeprom_device – [in] eeprom device,type of wm_device_t *
offset – [in] read offset
buf – [out] The read buffer
len – [in] The buffer size

返回:

WM_ERR_SUCCESS : read ok
WM_ERR_FAILED : read fail
WM_ERR_INVALID_PARAM: bad param

int wm_drv_eeprom_write(wm_device_t *eeprom_device, uint32_t offset, const void *data, uint32_t len)

write data to eeprom device

参数:

eeprom_device – [in] eeprom device,type of wm_device_t *
offset – [in] write offset
data – [in] The write data
len – [in] The size of write data

返回:

WM_ERR_SUCCESS : read ok
WM_ERR_FAILED : read fail
WM_ERR_INVALID_PARAM: bad param

int wm_drv_eeprom_get_size(wm_device_t *eeprom_device)

Get eeprom size, the size is configured in device table.

参数:

eeprom_device – [in] eeprom device,type of wm_device_t *

返回:

> 0: eeprom size
< 0: WM_ERR_INVALID_PARAM

int wm_drv_eeprom_set_wp(wm_device_t *eeprom_device, bool on)

set write protection

备注

The eeprom WP pin must connect to the gpio pin that configured in device table

备注

If the write protection function is enabled, the wm_drv_eeprom_write function will automatically turn off write protection before writing, and then turn on write protection after writing.

参数:

eeprom_device – [in] eeprom device,type of wm_device_t *
on – [in] 1: write protection, 0: no write protection

返回:

WM_ERR_SUCCESS : deinitialize ok
WM_ERR_INVALID_PARAM: bad param