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Fix potential UART speed problem while autoprobing. Extract communication test from pn532_uart_wakeup().

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This commit is contained in:
Romuald Conty 2010-04-21 10:19:26 +00:00
parent 67fd8ecd0e
commit ce6f7f2c84
1 changed files with 31 additions and 13 deletions
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44
libnfc/drivers/pn532_uart.c
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@ -65,7 +65,8 @@
#define SERIAL_DEFAULT_PORT_SPEED 115200
bool pn532_uart_wakeup(const nfc_device_spec_t nds);
void pn532_uart_wakeup(const nfc_device_spec_t nds);
bool pn532_uart_check_communication(const nfc_device_spec_t nds);
nfc_device_desc_t *
pn532_uart_pick_device (void)
@ -121,11 +122,14 @@ pn532_uart_list_devices(nfc_device_desc_t pnddDevices[], size_t szDevices, size_
if ((sp != INVALID_SERIAL_PORT) && (sp != CLAIMED_SERIAL_PORT))
{
// Serial port claimed: a PN532_UART may be found...
// FIXME try to send a command to PN53x to know if you really have a PN53x connected here
if(!pn532_uart_wakeup((nfc_device_spec_t)sp)) continue;
// Serial port claimed but we need to check if a PN532_UART is connected.
uart_set_speed(sp, SERIAL_DEFAULT_PORT_SPEED);
// PN532 could be powered down, we need to wake it up before line testing.
pn532_uart_wakeup((nfc_device_spec_t)sp);
// Check communication using "Diagnose" command, with "Comunication test" (0x00)
if(!pn532_uart_check_communication((nfc_device_spec_t)sp)) continue;
uart_close(sp);
snprintf(pnddDevices[*pszDeviceFound].acDevice, DEVICE_NAME_LENGTH - 1, "%s (%s)", "PN532", acConnect);
pnddDevices[*pszDeviceFound].acDevice[DEVICE_NAME_LENGTH - 1] = '\0';
pnddDevices[*pszDeviceFound].pcDriver = PN532_UART_DRIVER_NAME;
@ -166,7 +170,10 @@ nfc_device_t* pn532_uart_connect(const nfc_device_desc_t* pndd)
uart_set_speed(sp, pndd->uiSpeed);
}
if(!pn532_uart_wakeup((nfc_device_spec_t)sp)) return NULL;
// PN532 could be powered down, we need to wake it up before line testing.
pn532_uart_wakeup((nfc_device_spec_t)sp);
// Check communication using "Diagnose" command, with "Comunication test" (0x00)
if(!pn532_uart_check_communication((nfc_device_spec_t)sp)) return NULL;
DBG("Successfully connected to: %s",pndd->pcPort);
@ -279,23 +286,34 @@ bool pn532_uart_transceive(const nfc_device_spec_t nds, const byte_t* pbtTx, con
return true;
}
bool
void
pn532_uart_wakeup(const nfc_device_spec_t nds)
{
/** PN532C106 wakeup. */
/** High Speed Unit (HSU) wake up consist to send 0x55 and wait a "long" delay for PN532 being wakeup. */
const byte_t pncmd_pn532c106_wakeup_preamble[] = { 0x55,0x55,0x00,0x00,0x00 };
#ifdef DEBUG
printf(" TX: ");
print_hex(pncmd_pn532c106_wakeup_preamble,sizeof(pncmd_pn532c106_wakeup_preamble));
#endif
uart_send((serial_port)nds, pncmd_pn532c106_wakeup_preamble, sizeof(pncmd_pn532c106_wakeup_preamble));
}
bool
pn532_uart_check_communication(const nfc_device_spec_t nds)
{
byte_t abtRx[BUFFER_LENGTH];
size_t szRxLen;
/** PN532C106 wakeup. */
/** High Speed Unit (HSU) wake up consist to send 0x55 and wait a "long" delay for PN532 being wakeup. */
/** To be sure that PN532 is alive, we have put a "Diagnose" command to execute a "Communication Line Test" */
const byte_t pncmd_pn532c106_wakeup[] = { 0x55,0x55,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0x09,0xf7,0xd4,0x00,0x00,'l','i','b','n','f','c',0xbe,0x00 };
// const byte_t pncmd_pn532c106_wakeup[] = { 0x00,0x00,0xff,0x09,0xf7,0xd4,0x00,0x00,'l','i','b','n','f','c',0xbe,0x00 };
const byte_t pncmd_communication_test[] = { 0x00,0x00,0xff,0x09,0xf7,0xd4,0x00,0x00,'l','i','b','n','f','c',0xbe,0x00 };
#ifdef DEBUG
printf(" TX: ");
print_hex(pncmd_pn532c106_wakeup,sizeof(pncmd_pn532c106_wakeup));
print_hex(pncmd_communication_test,sizeof(pncmd_communication_test));
#endif
uart_send((serial_port)nds, pncmd_pn532c106_wakeup, sizeof(pncmd_pn532c106_wakeup));
uart_send((serial_port)nds, pncmd_communication_test, sizeof(pncmd_communication_test));
if(!uart_receive((serial_port)nds,abtRx,&szRxLen)) {
return false;