simmel-bootloader/nRF5_SDK_11.0.0_89a8197/components/libraries/fifo/app_fifo.c

187 lines
4.4 KiB
C
Raw Normal View History

/* Copyright (c) 2013 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 "app_fifo.h"
#include "sdk_common.h"
#include "nordic_common.h"
static __INLINE uint32_t fifo_length(app_fifo_t * p_fifo)
{
uint32_t tmp = p_fifo->read_pos;
return p_fifo->write_pos - tmp;
}
#define FIFO_LENGTH fifo_length(p_fifo) /**< Macro for calculating the FIFO length. */
/**@brief Put one byte to the FIFO. */
static __INLINE void fifo_put(app_fifo_t * p_fifo, uint8_t byte)
{
p_fifo->p_buf[p_fifo->write_pos & p_fifo->buf_size_mask] = byte;
p_fifo->write_pos++;
}
/**@brief Look at one byte in the FIFO. */
static __INLINE void fifo_peek(app_fifo_t * p_fifo, uint16_t index, uint8_t * p_byte)
{
*p_byte = p_fifo->p_buf[(p_fifo->read_pos + index) & p_fifo->buf_size_mask];
}
/**@brief Get one byte from the FIFO. */
static __INLINE void fifo_get(app_fifo_t * p_fifo, uint8_t * p_byte)
{
fifo_peek(p_fifo, 0, p_byte);
p_fifo->read_pos++;
}
uint32_t app_fifo_init(app_fifo_t * p_fifo, uint8_t * p_buf, uint16_t buf_size)
{
// Check buffer for null pointer.
if (p_buf == NULL)
{
return NRF_ERROR_NULL;
}
// Check that the buffer size is a power of two.
if (!IS_POWER_OF_TWO(buf_size))
{
return NRF_ERROR_INVALID_LENGTH;
}
p_fifo->p_buf = p_buf;
p_fifo->buf_size_mask = buf_size - 1;
p_fifo->read_pos = 0;
p_fifo->write_pos = 0;
return NRF_SUCCESS;
}
uint32_t app_fifo_put(app_fifo_t * p_fifo, uint8_t byte)
{
if (FIFO_LENGTH <= p_fifo->buf_size_mask)
{
fifo_put(p_fifo, byte);
return NRF_SUCCESS;
}
return NRF_ERROR_NO_MEM;
}
uint32_t app_fifo_get(app_fifo_t * p_fifo, uint8_t * p_byte)
{
if (FIFO_LENGTH != 0)
{
fifo_get(p_fifo, p_byte);
return NRF_SUCCESS;
}
return NRF_ERROR_NOT_FOUND;
}
uint32_t app_fifo_peek(app_fifo_t * p_fifo, uint16_t index, uint8_t * p_byte)
{
if (FIFO_LENGTH > index)
{
fifo_peek(p_fifo, index, p_byte);
return NRF_SUCCESS;
}
return NRF_ERROR_NOT_FOUND;
}
uint32_t app_fifo_flush(app_fifo_t * p_fifo)
{
p_fifo->read_pos = p_fifo->write_pos;
return NRF_SUCCESS;
}
uint32_t app_fifo_read(app_fifo_t * p_fifo, uint8_t * p_byte_array, uint32_t * p_size)
{
VERIFY_PARAM_NOT_NULL(p_fifo);
VERIFY_PARAM_NOT_NULL(p_size);
const uint32_t byte_count = fifo_length(p_fifo);
const uint32_t requested_len = (*p_size);
uint32_t index = 0;
uint32_t read_size = MIN(requested_len, byte_count);
(*p_size) = byte_count;
// Check if the FIFO is empty.
if (byte_count == 0)
{
return NRF_ERROR_NOT_FOUND;
}
// Check if application has requested only the size.
if (p_byte_array == NULL)
{
return NRF_SUCCESS;
}
// Fetch bytes from the FIFO.
while (index < read_size)
{
fifo_get(p_fifo, &p_byte_array[index++]);
}
(*p_size) = read_size;
return NRF_SUCCESS;
}
uint32_t app_fifo_write(app_fifo_t * p_fifo, uint8_t const * p_byte_array, uint32_t * p_size)
{
VERIFY_PARAM_NOT_NULL(p_fifo);
VERIFY_PARAM_NOT_NULL(p_size);
const uint32_t available_count = p_fifo->buf_size_mask - fifo_length(p_fifo) + 1;
const uint32_t requested_len = (*p_size);
uint32_t index = 0;
uint32_t write_size = MIN(requested_len, available_count);
(*p_size) = available_count;
// Check if the FIFO is FULL.
if (available_count == 0)
{
return NRF_ERROR_NO_MEM;
}
// Check if application has requested only the size.
if (p_byte_array == NULL)
{
return NRF_SUCCESS;
}
//Fetch bytes from the FIFO.
while (index < write_size)
{
fifo_put(p_fifo, p_byte_array[index++]);
}
(*p_size) = write_size;
return NRF_SUCCESS;
}