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Speed up PN532_UART driver by removing useless delay. Thanks to Zuck for issue reporting.

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This commit is contained in:
Romuald Conty 2009-12-09 10:32:55 +00:00
parent c15fc93494
commit 20df0d785d
1 changed files with 2 additions and 15 deletions
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17
src/lib/drivers/pn532_uart.c
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@ -36,11 +36,9 @@
#ifdef _WIN32
#define SERIAL_STRING "COM"
#define delay_ms( X ) Sleep( X )
#else
// unistd.h is needed for usleep() fct.
#include <unistd.h>
#define delay_ms( X ) usleep( X * 1000 )
#ifdef __APPLE__
// MacOS
@ -64,12 +62,12 @@ pn532_uart_pick_device (void)
size_t szN;
if (!pn532_uart_list_devices (pndd, 1, &szN)) {
ERR("%s", "pn532_uart_list_devices failed");
DBG("%s", "pn532_uart_list_devices failed");
return NULL;
}
if (szN == 0) {
ERR("%s", "No device found");
DBG("%s", "No device found");
return NULL;
}
}
@ -156,7 +154,6 @@ nfc_device_t* pn532_uart_connect(const nfc_device_desc_t* pndd)
const byte_t pncmd_pn532c106_wakeup[] = { 0x55,0x55,0x00,0x00,0x00,0x00,0x00,0xFF,0x03,0xFD,0xD4,0x14,0x01,0x17,0x00 };
uart_send(sp, pncmd_pn532c106_wakeup, sizeof(pncmd_pn532c106_wakeup));
delay_ms(10);
if (!uart_receive(sp,abtRxBuf,&szRxBufLen)) {
ERR("%s", "Unable to receive data. (RX)");
@ -222,16 +219,6 @@ bool pn532_uart_transceive(const nfc_device_spec_t nds, const byte_t* pbtTx, con
return false;
}
/** @note PN532 (at 115200 bauds) need 20ms between sending and receiving frame.
* It seems to be a required delay to able to send from host to device, plus the device computation then device respond transmission
*/
delay_ms(20);
/** @note PN532 (at 115200 bauds) need 30ms more to be stable (report correctly present tag, at each try: 20ms seems to be enought for one shot...)
* PN532 seems to work correctly with 50ms at 115200 bauds.
*/
delay_ms(30);
if (!uart_receive((serial_port)nds,abtRxBuf,&szRxBufLen)) {
ERR("%s", "Unable to receive data. (RX)");
return false;