add files from nrf52832 bootloader project
This commit is contained in:
112
nRF5_SDK_11.0.0_89a8197/components/libraries/slip/slip.c
Normal file
112
nRF5_SDK_11.0.0_89a8197/components/libraries/slip/slip.c
Normal file
@ -0,0 +1,112 @@
|
||||
/* Copyright (c) 2015 Nordic Semiconductor. All Rights Reserved.
|
||||
*
|
||||
* The information contained herein is property of Nordic Semiconductor ASA.
|
||||
* Terms and conditions of usage are described in detail in NORDIC
|
||||
* SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
|
||||
*
|
||||
* Licensees are granted free, non-transferable use of the information. NO
|
||||
* WARRANTY of ANY KIND is provided. This heading must NOT be removed from
|
||||
* the file.
|
||||
*
|
||||
*/
|
||||
|
||||
#include "slip.h"
|
||||
#include "nrf_error.h"
|
||||
|
||||
#define SLIP_END 0300 /* indicates end of packet */
|
||||
#define SLIP_ESC 0333 /* indicates byte stuffing */
|
||||
#define SLIP_ESC_END 0334 /* ESC ESC_END means END data byte */
|
||||
#define SLIP_ESC_ESC 0335 /* ESC ESC_ESC means ESC data byte */
|
||||
|
||||
|
||||
uint32_t slip_encode(uint8_t * p_output, uint8_t * p_input, uint32_t input_length, uint32_t output_buffer_length)
|
||||
{
|
||||
uint32_t input_index;
|
||||
uint32_t output_index;
|
||||
|
||||
for (input_index = 0, output_index = 0; input_index < input_length && output_index < output_buffer_length; input_index++)
|
||||
{
|
||||
switch (p_input[input_index])
|
||||
{
|
||||
case SLIP_END:
|
||||
p_output[output_index++] = SLIP_END;
|
||||
p_output[output_index++] = SLIP_ESC_END;
|
||||
break;
|
||||
|
||||
case SLIP_ESC:
|
||||
p_output[output_index++] = SLIP_ESC;
|
||||
p_output[output_index++] = SLIP_ESC_ESC;
|
||||
break;
|
||||
|
||||
default:
|
||||
p_output[output_index++] = p_input[input_index];
|
||||
}
|
||||
}
|
||||
p_output[output_index++] = (uint8_t)SLIP_END;
|
||||
p_output[output_index++] = (uint8_t)SLIP_END; // clarify that the packet has ended.
|
||||
|
||||
return output_index;
|
||||
}
|
||||
|
||||
|
||||
uint32_t slip_decoding_add_char(uint8_t c, buffer_t * p_buf, slip_state_t * current_state)
|
||||
{
|
||||
switch (*current_state)
|
||||
{
|
||||
case SLIP_DECODING:
|
||||
if (c == SLIP_END)
|
||||
{
|
||||
*current_state = SLIP_END_RECEIVED;
|
||||
}
|
||||
else if (c == SLIP_ESC)
|
||||
{
|
||||
*current_state = SLIP_END_RECEIVED;
|
||||
}
|
||||
else
|
||||
{
|
||||
p_buf->p_buffer[p_buf->current_index++] = c;
|
||||
p_buf->current_length++;
|
||||
}
|
||||
break;
|
||||
|
||||
case SLIP_ESC_RECEIVED:
|
||||
if (c == SLIP_ESC_ESC)
|
||||
{
|
||||
p_buf->p_buffer[p_buf->current_index++] = SLIP_ESC;
|
||||
p_buf->current_length++;
|
||||
*current_state = SLIP_DECODING;
|
||||
}
|
||||
else
|
||||
{
|
||||
// violation of protocol
|
||||
*current_state = SLIP_CLEARING_INVALID_PACKET;
|
||||
return NRF_ERROR_INVALID_DATA;
|
||||
}
|
||||
break;
|
||||
|
||||
case SLIP_END_RECEIVED:
|
||||
if (c == SLIP_ESC_END)
|
||||
{
|
||||
p_buf->p_buffer[p_buf->current_index++] = SLIP_END;
|
||||
p_buf->current_length++;
|
||||
*current_state = SLIP_DECODING;
|
||||
}
|
||||
else
|
||||
{
|
||||
// packet is finished
|
||||
*current_state = SLIP_DECODING;
|
||||
return NRF_SUCCESS;
|
||||
}
|
||||
break;
|
||||
|
||||
case SLIP_CLEARING_INVALID_PACKET:
|
||||
if (c == SLIP_END)
|
||||
{
|
||||
*current_state = SLIP_DECODING;
|
||||
p_buf->current_index = 0;
|
||||
p_buf->current_length = 0;
|
||||
}
|
||||
break;
|
||||
}
|
||||
return NRF_ERROR_BUSY;
|
||||
}
|
66
nRF5_SDK_11.0.0_89a8197/components/libraries/slip/slip.h
Normal file
66
nRF5_SDK_11.0.0_89a8197/components/libraries/slip/slip.h
Normal file
@ -0,0 +1,66 @@
|
||||
/* Copyright (c) 2015 Nordic Semiconductor. All Rights Reserved.
|
||||
*
|
||||
* The information contained herein is property of Nordic Semiconductor ASA.
|
||||
* Terms and conditions of usage are described in detail in NORDIC
|
||||
* SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
|
||||
*
|
||||
* Licensees are granted free, non-transferable use of the information. NO
|
||||
* WARRANTY of ANY KIND is provided. This heading must NOT be removed from
|
||||
* the file.
|
||||
*
|
||||
*/
|
||||
|
||||
#ifndef SLIP_H__
|
||||
#define SLIP_H__
|
||||
|
||||
#include <stdint.h>
|
||||
#include "app_fifo.h"
|
||||
|
||||
/** @file
|
||||
*
|
||||
* @defgroup slip SLIP encoding decoding
|
||||
* @{
|
||||
* @ingroup app_common
|
||||
*
|
||||
* @brief This module encodes and decodes slip packages (RFC1055).
|
||||
*
|
||||
* @details The standard is described in https://tools.ietf.org/html/rfc1055
|
||||
*/
|
||||
|
||||
typedef enum {
|
||||
SLIP_DECODING,
|
||||
SLIP_END_RECEIVED,
|
||||
SLIP_ESC_RECEIVED,
|
||||
SLIP_CLEARING_INVALID_PACKET,
|
||||
} slip_state_t;
|
||||
|
||||
typedef struct {
|
||||
uint8_t * p_buffer;
|
||||
uint32_t current_index;
|
||||
uint32_t current_length;
|
||||
uint32_t len;
|
||||
} buffer_t;
|
||||
|
||||
/**@brief Encodes a slip packet.
|
||||
*
|
||||
* @details Note that the encoded output data will be longer than the input data.
|
||||
*
|
||||
* @retval The length of the encoded packet. If it is smaller than the input length, an error has occurred.
|
||||
*/
|
||||
uint32_t slip_encode(uint8_t * p_output, uint8_t * p_input, uint32_t input_length, uint32_t output_buffer_length);
|
||||
|
||||
/**@brief Decodes a slip packet.
|
||||
*
|
||||
* @details When decoding a slip packet, a state must be preserved. Initial state must be set to SLIP_DECODING.
|
||||
*
|
||||
* @retval NRF_SUCCESS when a packet is parsed. The length of the packet can be read out from p_buf->current_index
|
||||
* @retval NRF_ERROR_BUSY when packet is not finished parsing
|
||||
* @retval NRF_ERROR_INVALID_DATA when packet is encoded wrong.
|
||||
This moves the decoding to SLIP_CLEARING_INVALID_PACKET, and will stay in this state until SLIP_END is encountered.
|
||||
*/
|
||||
uint32_t slip_decoding_add_char(uint8_t c, buffer_t * p_buf, slip_state_t * current_state);
|
||||
|
||||
|
||||
#endif // SLIP_H__
|
||||
|
||||
/** @} */
|
Reference in New Issue
Block a user