Low-Level functions
Low-level module consists of callback-only functions, which are called by middleware and must be implemented by final application.
Tip
Check Porting guide for actual implementation
- group LWESP_LL
Low-level communication functions.
Typedefs
-
typedef size_t (*lwesp_ll_send_fn)(const void *data, size_t len)
Function prototype for AT output data.
- Param data
[in] Pointer to data to send. This parameter can be set to
NULL
, indicating to the low-level that (if used) DMA could be started to transmit data to the device- Param len
[in] Number of bytes to send. This parameter can be set to
0
to indicate that internal buffer can be flushed to stream. This is implementation defined and feature might be ignored- Return
Number of bytes sent
-
typedef uint8_t (*lwesp_ll_reset_fn)(uint8_t state)
Function prototype for hardware reset of ESP device.
- Param state
[in] State indicating reset. When set to
1
, reset must be active (usually pin active low), or set to0
when reset is cleared- Return
1
on successful action,0
otherwise
Functions
-
lwespr_t lwesp_ll_init(lwesp_ll_t *ll)
Callback function called from initialization process.
Note
This function may be called multiple times if AT baudrate is changed from application. It is important that every configuration except AT baudrate is configured only once!
Note
This function may be called from different threads in ESP stack when using OS. When LWESP_CFG_INPUT_USE_PROCESS is set to
1
, this function may be called from user UART thread.- Parameters
ll – [inout] Pointer to lwesp_ll_t structure to fill data for communication functions
- Returns
lwespOK on success, member of lwespr_t enumeration otherwise
-
lwespr_t lwesp_ll_deinit(lwesp_ll_t *ll)
Callback function to de-init low-level communication part.
- Parameters
ll – [inout] Pointer to lwesp_ll_t structure to fill data for communication functions
- Returns
lwespOK on success, member of lwespr_t enumeration otherwise
-
struct lwesp_ll_t
- #include <lwesp_types.h>
Low level user specific functions.
Public Members
-
lwesp_ll_send_fn send_fn
Callback function to transmit data
-
lwesp_ll_reset_fn reset_fn
Reset callback function
-
uint32_t baudrate
UART baudrate value
-
struct lwesp_ll_t::[anonymous] uart
UART communication parameters
-
lwesp_ll_send_fn send_fn
-
typedef size_t (*lwesp_ll_send_fn)(const void *data, size_t len)