Function sdio_slave_recv_packet

pub unsafe extern "C" fn sdio_slave_recv_packet(
    handle_ret: *mut sdio_slave_buf_handle_t,
    wait: TickType_t,
) -> esp_err_t

Get buffer of received data if exist with packet information. The driver returns the ownership of the buffer to the app.

When you see return value is ESP_ERR_NOT_FINISHED, you should call this API iteratively until the return value is ESP_OK. All the continuous buffers returned with ESP_ERR_NOT_FINISHED, together with the last buffer returned with ESP_OK, belong to one packet from the host.

You can call simpler sdio_slave_recv instead, if the host never send data longer than the Receiving buffer size, or you don’t care about the packet boundary (e.g. the data is only a byte stream).

@param handle_ret Handle of the buffer holding received data. Use this handle in sdio_slave_recv_load_buf() to receive in the same buffer again. @param wait Time to wait before data received.

@note Call sdio_slave_load_buf with the handle to re-load the buffer onto the link list, and receive with the same buffer again. The address and length of the buffer got here is the same as got from sdio_slave_get_buffer.

@return - ESP_ERR_INVALID_ARG if handle_ret is NULL - ESP_ERR_TIMEOUT if timeout before receiving new data - ESP_ERR_NOT_FINISHED if returned buffer is not the end of a packet from the host, should call this API again until the end of a packet - ESP_OK if success