/**
* \brief Send logical "0" over RF
* \details azero bit be represented by an off-to-on transition
* \ of the RF signal at the middle of a clock period.
* \ Remenber, the Oregon v2.1 protocol add an inverted bit first
*/
inline void OSV2::sendZero(void)
{
SEND_HIGH();
delayMicroseconds(TIME);
SEND_LOW();
delayMicroseconds(TWOTIME);
SEND_HIGH();
delayMicroseconds(TIME);
}
int hw_sendData(
const int REG,
const unsigned char data_) {
unsigned long int_flags;
struct timeval tv1,tv2;
unsigned char data = data_;
Fin();
if (REG<0 || REG>8) {
Ftr();
return -1;
}
Ftr(" echo %d > %d", data, REG);
if (REG == 0) {
// 1110 0111
data &= 0xe7;
// To disable unstable flags, vendor suggests it.
}
do_gettimeofday(&tv1);
spin_lock_irqsave(&my_lock, int_flags);
mHW.reg[REG] = data;
gpio_set_value(mHW.CTRL, 1);
udelay(20); // TDS: data start. typical 10 us
// fill the address.
if (REG&0x08) SEND_HIGH(); else SEND_LOW();
if (REG&0x04) SEND_HIGH(); else SEND_LOW();
if (REG&0x02) SEND_HIGH(); else SEND_LOW();
if (REG&0x01) SEND_HIGH(); else SEND_LOW();
// fill the data.
if (data&0x80) SEND_HIGH(); else SEND_LOW();
if (data&0x40) SEND_HIGH(); else SEND_LOW();
if (data&0x20) SEND_HIGH(); else SEND_LOW();
if (data&0x10) SEND_HIGH(); else SEND_LOW();
if (data&0x08) SEND_HIGH(); else SEND_LOW();
if (data&0x04) SEND_HIGH(); else SEND_LOW();
if (data&0x02) SEND_HIGH(); else SEND_LOW();
if (data&0x01) SEND_HIGH(); else SEND_LOW();
// fill EOD
gpio_set_value(mHW.CTRL,0);
udelay(8); //typical val: 2 us
gpio_set_value(mHW.CTRL,1);
udelay(400); //typical val: 350 us
spin_unlock_irqrestore(&my_lock, int_flags);
do_gettimeofday(&tv2);
Fout("at %d, tv: (%d)us", REG, tv2.tv_usec - tv1.tv_usec);
return 1;
}
