AS3955 datasheet(91/111 Pages) AMSCO

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ams Datasheet

Page 91

[v1-01] 2015-Apr-29

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AS3955 − Application Information

{

/* R(NAK) received */

/* 7.5.3.2 Rule E, Note 2 no toggling for NAK*/

txBuffer.data[0] = ISO14443_4_PCB_RACK | isoDepCnt | CURR_CID_BIT;

txBuffer.size = dllHeaderSize;

err = as3955TxNBytes(txBuffer.data, txBuffer.size, 0,

AS3955_TX_FLAG_NONE);

rxBuffer.size = 0;

rxBuffer.state = as3955FrameIdle;

}

else

{

/* R(ACK) received */

/* 7.5.3.2 Rule E, normal toggling*/

isoDepCnt = !isoDepCnt;

if (L4_WAIT_FOR_ACK == state)

{

txBuffer.data[0] = ISO14443_4_PCB_I | isoDepCnt | CURR_CID_BIT;

if ((chainOutBufferSize - chainOutSize +

dllHeaderSize) > l4Config.fsd)

{

//continue with chaining

memcpy(txBuffer.data + dllHeaderSize,

chainOutBuffer + chainOutSize,

l4Config.fsd - dllHeaderSize);

txBuffer.size = l4Config.fsd;

chainOutSize += l4Config.fsd - dllHeader-Size;

txBuffer.data[0] |= ISO14443_4_PCB_I_CHAINING;

}

else

{

//last block of chaining

memcpy(txBuffer.data + dllHeaderSize,

chainOutBuffer + chainOutSize,

chainOutBufferSize - chainOutSize);

txBuffer.size = dllHeaderSize +

(chainOutBufferSize –

chainOutSize);

chainOutSize = 0;

chainOutBufferSize = 0;

state = L4_INITIALIZED;

}

err = as3955TxNBytes(txBuffer.data, txBuffer.size, 0,

AS3955_TX_FLAG_NONE);

}

else

{

//R(ACK)!

txBuffer.data[0] = ISO14443_4_PCB_RACK | isoDepCnt | CURR_CID_BIT;

txBuffer.size = dllHeaderSize;

err = as3955TxNBytes(txBuffer.data, txBuffer.size, 0,

AS3955_TX_FLAG_NONE);

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