sdio - sdio

Adapted Air601 Air101/Air103

Note

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Example

-- The function of mounting the tf card to the file system in this sdio library has been replaced by the sdio mode of fatfs.
-- This sdio library only retains functions that directly read and write TF cards.
-- For example using sdio 0 to mount the TF card
fatfs.mount(fatfs.SDIO, "/sd", 0)

-- After the mount is completed, just use the relevant functions of the io library to operate it.
local f = io.open("/sd/abc.txt")

sdio.init(id)

Initialization sdio

Parameters

Incoming Value Type	Explanation
int	The channel ID, which is related to the specific device, usually starts from 0, the default 0

Return Value

return value type	explanation
boolean	Open Results

Examples

None

---

sdio.sd_read(id, offset, len)

direct reading and writing of data on sd card

Parameters

Incoming Value Type	Explanation
int	sdio Bus id
int	Offset, must be a multiple of 512
int	Length, must be a multiple of 512

Return Value

return value type	explanation
string	If the read is successful, return string, otherwise return nil

Examples

-- initialize sdio and read sd card data directly
sdio.init(0)
local t = sdio.sd_read(0, 0, 1024)
if t then
    --- xxx
end

---

sdio.sd_write(id, data, offset)

write sd card directly

Parameters

Incoming Value Type	Explanation
int	sdio Bus id
string	The length of the data to be written must be a multiple of 512.
int	Offset, must be a multiple of 512

Return Value

return value type	explanation
bool	If the read is successful, return true, otherwise return false

Examples

-- initialize sdio and read sd card data directly
sdio.init(0)
local t = sdio.sd_write(0, data, 0)
if t then
    --- xxx
end

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