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pn53x: add timed versions of transceive_bytes/bits

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This commit is contained in:
Philippe Teuwen 2011-04-04 14:16:36 +00:00
parent b21d3c6728
commit fb398c387f
9 changed files with 299 additions and 9 deletions
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149
libnfc/chips/pn53x.c
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@ -1138,6 +1138,81 @@ pn53x_initiator_transceive_bits (nfc_device_t * pnd, const byte_t * pbtTx, const
return true;
}
bool
pn53x_initiator_transceive_bits_timed (nfc_device_t * pnd, const byte_t * pbtTx, const size_t szTxBits,
const byte_t * pbtTxPar, byte_t * pbtRx, size_t * pszRxBits, byte_t * pbtRxPar, uint16_t * cycles)
{
unsigned int i;
uint8_t sz, parity;
uint16_t prescaler = 0;
uint16_t reloadval = 0xFFFF;
uint8_t counter_hi, counter_lo;
uint16_t counter;
// We can not just send bytes without parity while the PN53X expects we handled them
if (!pnd->bPar)
return false;
// Sorry, no easy framing support
// TODO: to be changed once we'll provide easy framing support from libnfc itself...
if (pnd->bEasyFraming)
return false;
// Sorry, no CRC support
// TODO: to be changed once we'll provide easy CRC support from libnfc itself...
if (pnd->bCrc)
return false;
// Initialize timer
pn53x_write_register (pnd, REG_CIU_TMODE, 0xFF, SYMBOL_TAUTO | ((prescaler >> 8) & SYMBOL_TPRESCALERHI));
pn53x_write_register (pnd, REG_CIU_TPRESCALER, 0xFF, (prescaler & SYMBOL_TPRESCALERLO));
pn53x_write_register (pnd, REG_CIU_TRELOADVALHI, 0xFF, (reloadval >> 8) & 0xFF);
pn53x_write_register (pnd, REG_CIU_TRELOADVALLO, 0xFF, reloadval & 0xFF);
// Once timer is started, we cannot use Tama commands anymore.
// E.g. on SCL3711 timer settings are reset by 0x42 InCommunicateThru command to:
// 631a=82 631b=a5 631c=02 631d=00
// Prepare FIFO
pn53x_write_register (pnd, REG_CIU_COMMAND, 0xFF, SYMBOL_COMMAND & SYMBOL_COMMAND_TRANSCEIVE);
pn53x_write_register (pnd, REG_CIU_FIFOLEVEL, 0xFF, SYMBOL_FLUSH_BUFFER);
for (i=0; i< ((szTxBits / 8) + 1); i++) {
pn53x_write_register (pnd, REG_CIU_FIFODATA, 0xFF, pbtTx[i]);
}
// Send data
pn53x_write_register (pnd, REG_CIU_BIT_FRAMING, 0xFF, SYMBOL_START_SEND | ((szTxBits % 8) & SYMBOL_TX_LAST_BITS));
// Recv data
pn53x_read_register (pnd, REG_CIU_FIFOLEVEL, &sz);
*pszRxBits = (sz & SYMBOL_FIFO_LEVEL) * 8;
for (i=0; i< sz; i++) {
pn53x_read_register (pnd, REG_CIU_FIFODATA, &(pbtRx[i]));
}
// Read timer
pn53x_read_register (pnd, REG_CIU_TCOUNTERVALHI, &counter_hi);
pn53x_read_register (pnd, REG_CIU_TCOUNTERVALLO, &counter_lo);
counter = counter_hi;
counter = (counter << 8) + counter_lo;
if (counter == 0) {
// counter saturated
*cycles = 0xFFFF;
} else {
*cycles = 0xFFFF - counter + 1;
// Correction, depending on last parity bit sent
sz = pbtTx[szTxBits / 8];
parity = (sz >> 7) ^ ((sz >> 6) & 1) ^ ((sz >> 5) & 1) ^ ((sz >> 4) & 1) ^ ((sz >> 3) & 1) ^ ((sz >> 2) & 1) ^ ((sz >> 1) & 1) ^ (sz & 1);
parity = parity ? 0:1;
if (parity) {
*cycles += CHIP_DATA(pnd)->timer_correction_yy;
} else {
*cycles += CHIP_DATA(pnd)->timer_correction_zy;
}
}
return true;
}
bool
pn53x_initiator_transceive_bytes (nfc_device_t * pnd, const byte_t * pbtTx, const size_t szTx, byte_t * pbtRx,
size_t * pszRx)
@ -1182,6 +1257,80 @@ pn53x_initiator_transceive_bytes (nfc_device_t * pnd, const byte_t * pbtTx, cons
return true;
}
bool
pn53x_initiator_transceive_bytes_timed (nfc_device_t * pnd, const byte_t * pbtTx, const size_t szTx, byte_t * pbtRx,
size_t * pszRx, uint16_t * cycles)
{
unsigned int i;
uint8_t sz, parity;
uint16_t prescaler = 0;
uint16_t reloadval = 0xFFFF;
uint8_t counter_hi, counter_lo;
uint16_t counter;
// We can not just send bytes without parity while the PN53X expects we handled them
if (!pnd->bPar)
return false;
// Sorry, no easy framing support
// TODO: to be changed once we'll provide easy framing support from libnfc itself...
if (pnd->bEasyFraming)
return false;
// Sorry, no CRC support
// TODO: to be changed once we'll provide easy CRC support from libnfc itself...
if (pnd->bCrc)
return false;
// Initialize timer
pn53x_write_register (pnd, REG_CIU_TMODE, 0xFF, SYMBOL_TAUTO | ((prescaler >> 8) & SYMBOL_TPRESCALERHI));
pn53x_write_register (pnd, REG_CIU_TPRESCALER, 0xFF, (prescaler & SYMBOL_TPRESCALERLO));
pn53x_write_register (pnd, REG_CIU_TRELOADVALHI, 0xFF, (reloadval >> 8) & 0xFF);
pn53x_write_register (pnd, REG_CIU_TRELOADVALLO, 0xFF, reloadval & 0xFF);
// Once timer is started, we cannot use Tama commands anymore.
// E.g. on SCL3711 timer settings are reset by 0x42 InCommunicateThru command to:
// 631a=82 631b=a5 631c=02 631d=00
// Prepare FIFO
pn53x_write_register (pnd, REG_CIU_COMMAND, 0xFF, SYMBOL_COMMAND & SYMBOL_COMMAND_TRANSCEIVE);
pn53x_write_register (pnd, REG_CIU_FIFOLEVEL, 0xFF, SYMBOL_FLUSH_BUFFER);
for (i=0; i< szTx; i++) {
pn53x_write_register (pnd, REG_CIU_FIFODATA, 0xFF, pbtTx[i]);
}
// Send data
pn53x_write_register (pnd, REG_CIU_BIT_FRAMING, 0xFF, SYMBOL_START_SEND);
// Recv data
pn53x_read_register (pnd, REG_CIU_FIFOLEVEL, &sz);
*pszRx = sz & SYMBOL_FIFO_LEVEL;
for (i=0; i< sz; i++) {
pn53x_read_register (pnd, REG_CIU_FIFODATA, &(pbtRx[i]));
}
// Read timer
pn53x_read_register (pnd, REG_CIU_TCOUNTERVALHI, &counter_hi);
pn53x_read_register (pnd, REG_CIU_TCOUNTERVALLO, &counter_lo);
counter = counter_hi;
counter = (counter << 8) + counter_lo;
if (counter == 0) {
// counter saturated
*cycles = 0xFFFF;
} else {
*cycles = 0xFFFF - counter + 1;
// Correction, depending on last parity bit sent
sz = pbtTx[szTx -1];
parity = (sz >> 7) ^ ((sz >> 6) & 1) ^ ((sz >> 5) & 1) ^ ((sz >> 4) & 1) ^ ((sz >> 3) & 1) ^ ((sz >> 2) & 1) ^ ((sz >> 1) & 1) ^ (sz & 1);
parity = parity ? 0:1;
if (parity) {
*cycles += CHIP_DATA(pnd)->timer_correction_yy;
} else {
*cycles += CHIP_DATA(pnd)->timer_correction_zy;
}
}
return true;
}
#define SAK_ISO14443_4_COMPLIANT 0x20
bool
pn53x_target_init (nfc_device_t * pnd, nfc_target_t * pnt, byte_t * pbtRx, size_t * pszRx)