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Reduce the I2C ready delay wait, which improves reading speed by butloads.

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daid 2016-07-12 12:41:37 +02:00
parent 4a1b48a8af
commit 0afc33e442
1 changed files with 1 additions and 4 deletions
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5
libnfc/drivers/pn532_i2c.c
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@ -68,7 +68,7 @@ struct pn532_i2c_data {
}; };
/* Delay for the loop waiting for READY frame (in ms) */ /* Delay for the loop waiting for READY frame (in ms) */
#define PN532_RDY_LOOP_DELAY 90 #define PN532_RDY_LOOP_DELAY 1
const struct timespec rdyDelay = { const struct timespec rdyDelay = {
.tv_sec = 0, .tv_sec = 0,
@ -389,7 +389,6 @@ pn532_i2c_wait_rdyframe(nfc_device *pnd, uint8_t *pbtData, const size_t szDataLe
struct timeval start_tv, cur_tv; struct timeval start_tv, cur_tv;
long long duration; long long duration;
// Actual I2C response frame includes an additional status byte, // Actual I2C response frame includes an additional status byte,
// so we use a temporary buffer to read the I2C frame // so we use a temporary buffer to read the I2C frame
uint8_t i2cRx[PN53x_EXTENDED_FRAME__DATA_MAX_LEN + 1]; uint8_t i2cRx[PN53x_EXTENDED_FRAME__DATA_MAX_LEN + 1];
@ -402,7 +401,6 @@ pn532_i2c_wait_rdyframe(nfc_device *pnd, uint8_t *pbtData, const size_t szDataLe
do { do {
// Wait a little bit before reading // Wait a little bit before reading
nanosleep(&rdyDelay, (struct timespec *) NULL); nanosleep(&rdyDelay, (struct timespec *) NULL);
int recCount = i2c_read(DRIVER_DATA(pnd)->dev, i2cRx, szDataLen + 1); int recCount = i2c_read(DRIVER_DATA(pnd)->dev, i2cRx, szDataLen + 1);
if (DRIVER_DATA(pnd)->abort_flag) { if (DRIVER_DATA(pnd)->abort_flag) {
@ -445,7 +443,6 @@ pn532_i2c_wait_rdyframe(nfc_device *pnd, uint8_t *pbtData, const size_t szDataLe
} }
} }
} while (!done); } while (!done);
return res; return res;
} }