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/**
*********************************************************************************************************
* Copyright(c) 2017, Realtek Semiconductor Corporation. All rights reserved.
**********************************************************************************************************
* @file ir_encode.c
* @brief This file provides driver of IR protocol encoding.
* @details
* @author elliot_chen
* @date 2017-09-19
* @version v1.0
*********************************************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "ir_encode.h"
/* Internal defines -------------------------------------------------------------------*/
#define IR_ENCODE_BIT_LEN_TO_BYTE_LEN 7
#define IR_ENCODE_BYTE_LEN 8
#define IR_ENCODE_LOGICAL_1 (0x01)
/**
* @brief unit convert.
* @param time: time of waveform.
* @param carrier_cycle: cycle of carrier.
* @retval vaule of data whose unit is cycle of carrier.
*/
IR_DataType ConvertToCarrierCycle(uint32_t time, uint32_t freq, IR_DATA_TYPE data_type)
{
if (data_type == TIME_UNIT)
{
#if HARDWARE_AVOIDANCE
return ((time & IR_PULSE_HIGH) | ((time & IR_DATA_MSK) * freq / 1000 - 1));
#else
return ((time & IR_PULSE_HIGH) | ((time & IR_DATA_MSK) * freq / 1000));
#endif
}
else
{
#if HARDWARE_AVOIDANCE
return ((time & IR_PULSE_HIGH) | ((time & IR_DATA_MSK) - 1));
#else
return time;
#endif
}
}
/**
* @brief check specify bit value of data.
* @param a: data which want to check.
* @param bit_pos: position of bit which want to check
* @retval
*/
static uint8_t CheckBitStatus(uint32_t a, uint32_t bit_pos)
{
return ((a >> bit_pos) & 0x1);
}
/**
* @brief Encode data to packet.
* @param IR_DataStruct: pointer to struct which store IR data code.
* @param IR_Protocol: pointer to specify IR protocol structure.
* @retval None
*/
IR_Return_Type IR_EncodeCode(IR_DataTypeDef *IR_DataStruct, IR_ProtocolTypeDef *IR_Protocol,
uint8_t index, uint8_t bitLen, uint8_t *pBufLen)
{
uint8_t codeWidth = 0;
uint16_t i = 0;
uint16_t bitPos = 0;
IR_DataType Log1[IR_MAX_LOG_WAVFORM_SIZE];
IR_DataType Log0[IR_MAX_LOG_WAVFORM_SIZE];
for (i = 0; i < IR_MAX_LOG_WAVFORM_SIZE; i++)
{
Log1[i] = ConvertToCarrierCycle(IR_Protocol->log1Buf[i], IR_DataStruct->carrierFreq,
IR_Protocol->unit);
Log0[i] = ConvertToCarrierCycle(IR_Protocol->log0Buf[i], IR_DataStruct->carrierFreq,
IR_Protocol->unit);
}
for (; bitLen > 0; index++)
{
if (bitLen > IR_ENCODE_BYTE_LEN)
{
bitLen -= IR_ENCODE_BYTE_LEN;
codeWidth = IR_ENCODE_BYTE_LEN;
}
else
{
codeWidth = bitLen;
bitLen = 0;
}
if (IR_Protocol->coding_order == IR_CODING_LSB_FIRST)
{
for (bitPos = 0; bitPos < codeWidth; bitPos++)
{
if (CheckBitStatus(IR_DataStruct->code[index], bitPos) == IR_ENCODE_LOGICAL_1)
{
IR_DataStruct->irBuf[*pBufLen] = Log1[0];
IR_DataStruct->irBuf[*pBufLen + 1] = Log1[1];
}
else
{
IR_DataStruct->irBuf[*pBufLen] = Log0[0];
IR_DataStruct->irBuf[*pBufLen + 1] = Log0[1];
}
*pBufLen += IR_MAX_LOG_WAVFORM_SIZE;
}
}
else
{
for (bitPos = codeWidth; bitPos > 0; bitPos--)
{
if (CheckBitStatus(IR_DataStruct->code[index], bitPos - 1) == IR_ENCODE_LOGICAL_1)
{
IR_DataStruct->irBuf[*pBufLen] = Log1[0];
IR_DataStruct->irBuf[*pBufLen + 1] = Log1[1];
}
else
{
IR_DataStruct->irBuf[*pBufLen] = Log0[0];
IR_DataStruct->irBuf[*pBufLen + 1] = Log0[1];
}
*pBufLen += IR_MAX_LOG_WAVFORM_SIZE;
}
}
}
return IR_SUCCEED;
}
/**
* @brief Encode data to packet.
* @param IR_DataStruct: pointer to struct which store IR data code.
* @param IR_Protocol: pointer to specify IR protocol structure.
* @param in_order: encoding order
* @retval None
*/
IR_Return_Type IR_Encode(IR_DataTypeDef *IR_DataStruct, IR_ProtocolTypeDef *IR_Protocol,
bool in_order)
{
uint8_t custom_code_len = 0;
uint16_t index = 0;
uint8_t bufLen = IR_Protocol->headerLen;
/* Check parameters */
if (IR_DataStruct->carrierFreq != IR_Protocol->carrierFreq)
{
return IR_FREQENCY_ERROR;
}
/* Encoding header */
for (index = 0; index < IR_Protocol->headerLen; index++)
{
IR_DataStruct->irBuf[index] = ConvertToCarrierCycle(IR_Protocol->headerBuf[index], \
IR_DataStruct->carrierFreq, IR_Protocol->unit);
}
custom_code_len = (IR_DataStruct->custom_bit_len + IR_ENCODE_BIT_LEN_TO_BYTE_LEN) /
IR_ENCODE_BYTE_LEN;
if (in_order == true)
{
IR_EncodeCode(IR_DataStruct, IR_Protocol, 0, IR_DataStruct->custom_bit_len, &bufLen);
IR_EncodeCode(IR_DataStruct, IR_Protocol, custom_code_len, IR_DataStruct->key_bit_len, &bufLen);
}
else
{
IR_EncodeCode(IR_DataStruct, IR_Protocol, custom_code_len, IR_DataStruct->key_bit_len, &bufLen);
IR_EncodeCode(IR_DataStruct, IR_Protocol, 0, IR_DataStruct->custom_bit_len, &bufLen);
}
/* Encode stop code */
if (IR_Protocol->stopBuf != 0)
{
IR_DataStruct->irBuf[bufLen++] = ConvertToCarrierCycle(IR_Protocol->stopBuf, \
IR_DataStruct->carrierFreq, IR_Protocol->unit);
}
#if SOFTWARE_AVOIDANCE
IR_DataStruct->irBuf[bufLen++] = 0;
#endif
IR_DataStruct->bufLen = bufLen;
return IR_SUCCEED;
}
/**
* @brief Encode repeat code to packet.
* @param IR_DataStruct: pointer to struct which store repeat code data.
* @param IR_Protocol: pointer to specify IR protocol structure.
* @retval None
*/
IR_Return_Type IR_RepeatCodeEncode(IR_DataTypeDef *IR_DataStruct, IR_RepeatCodeTypeDef *IR_Protocol)
{
uint16_t index = 0;
/* Error handle */
if (IR_DataStruct->carrierFreq == 0)
{
return IR_FREQENCY_ERROR;
}
/* Encode repeat code */
for (index = 0; index < IR_Protocol->RepeatCodeLen; index++)
{
IR_DataStruct->irBuf[index] = ConvertToCarrierCycle(IR_Protocol->RepeatCodeBuf[index],
IR_DataStruct->carrierFreq, IR_Protocol->unit);
}
IR_DataStruct->bufLen = IR_Protocol->RepeatCodeLen;
#if SOFTWARE_AVOIDANCE
IR_DataStruct->irBuf[index] = 0;
IR_DataStruct->bufLen++;
#endif
return IR_SUCCEED;
}
/******************* (C) COPYRIGHT 2017 Realtek Semiconductor Corporation *****END OF FILE****/
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