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