/* This RF programming code is based upon the code found in v2.16.0.0 of the * ZyDAS vendor driver. Unlike other RF's, Ubec publish full technical specs * for this RF on their website, so we're able to understand more than
* usual as to what is going on. Thumbs up for Ubec for doing that. */
/* The 3-wire serial interface provides access to 8 write-only registers.
* The data format is a 4 bit register address followed by a 20 bit value. */ #define UW2453_REGWRITE(reg, val) ((((reg) & 0xf) << 20) | ((val) & 0xfffff))
/* For channel tuning, we have to configure registers 1 (synthesizer), 2 (synth * fractional divide ratio) and 3 (VCO config). * * We configure the RF to produce an interrupt when the PLL is locked onto * the configured frequency. During initialization, we run through a variety * of different VCO configurations on channel 1 until we detect a PLL lock. * When this happens, we remember which VCO configuration produced the lock * and use it later. Actually, we use the configuration *after* the one that * produced the lock, which seems odd, but it works. * * If we do not see a PLL lock on any standard VCO config, we fall back on an * autocal configuration, which has a fixed (as opposed to per-channel) VCO * config and different synth values from the standard set (divide ratio
* is still shared with the standard set). */
/* The per-channel synth values for all standard VCO configurations. These get
* written to register 1. */ staticconst u8 uw2453_std_synth[] = {
RF_CHANNEL( 1) = 0x47,
RF_CHANNEL( 2) = 0x47,
RF_CHANNEL( 3) = 0x67,
RF_CHANNEL( 4) = 0x67,
RF_CHANNEL( 5) = 0x67,
RF_CHANNEL( 6) = 0x67,
RF_CHANNEL( 7) = 0x57,
RF_CHANNEL( 8) = 0x57,
RF_CHANNEL( 9) = 0x57,
RF_CHANNEL(10) = 0x57,
RF_CHANNEL(11) = 0x77,
RF_CHANNEL(12) = 0x77,
RF_CHANNEL(13) = 0x77,
RF_CHANNEL(14) = 0x4f,
};
/* This table stores the synthesizer fractional divide ratio for *all* VCO * configurations (both standard and autocal). These get written to register 2.
*/ staticconst u16 uw2453_synth_divide[] = {
RF_CHANNEL( 1) = 0x999,
RF_CHANNEL( 2) = 0x99b,
RF_CHANNEL( 3) = 0x998,
RF_CHANNEL( 4) = 0x99a,
RF_CHANNEL( 5) = 0x999,
RF_CHANNEL( 6) = 0x99b,
RF_CHANNEL( 7) = 0x998,
RF_CHANNEL( 8) = 0x99a,
RF_CHANNEL( 9) = 0x999,
RF_CHANNEL(10) = 0x99b,
RF_CHANNEL(11) = 0x998,
RF_CHANNEL(12) = 0x99a,
RF_CHANNEL(13) = 0x999,
RF_CHANNEL(14) = 0xccc,
};
staticint uw2453_write_vco_cfg(struct zd_chip *chip, u16 value)
{ /* vendor driver always sets these upper bits even though the specs say
* they are reserved */
u32 val = 0x40000 | value; return zd_rfwrite_locked(chip, UW2453_REGWRITE(3, val), RF_RV_BITS);
}
staticint uw2453_init_mode(struct zd_chip *chip)
{ staticconst u32 rv[] = {
UW2453_REGWRITE(0, 0x25f98), /* enter IDLE mode */
UW2453_REGWRITE(0, 0x25f9a), /* enter CAL_VCO mode */
UW2453_REGWRITE(0, 0x25f94), /* enter RX/TX mode */
UW2453_REGWRITE(0, 0x27fd4), /* power down RSSI circuit */
};
if (int_value >= ARRAY_SIZE(uw2453_txgain)) {
dev_dbg_f(zd_chip_dev(chip), "can't configure TX gain for " "int value %x on channel %d\n", int_value, channel); return 0;
}
staticconst u32 rv[] = {
UW2453_REGWRITE(4, 0x2b), /* configure receiver gain */
UW2453_REGWRITE(5, 0x19e4f), /* configure transmitter gain */
UW2453_REGWRITE(6, 0xf81ad), /* enable RX/TX filter tuning */
UW2453_REGWRITE(7, 0x3fffe), /* disable TX gain in test mode */
/* enter CAL_FIL mode, TX gain set by registers, RX gain set by pins,
* RSSI circuit powered down, reduced RSSI range */
UW2453_REGWRITE(0, 0x25f9c), /* 5d01 cal_fil */
/* disable manual VCO band selection */
UW2453_REGWRITE(3, 0x7602),
/* enable manual VCO band selection, configure current level */
UW2453_REGWRITE(3, 0x46063),
};
r = zd_iowrite16a_locked(chip, ioreqs, ARRAY_SIZE(ioreqs)); if (r) return r;
r = zd_rfwritev_locked(chip, rv, ARRAY_SIZE(rv), RF_RV_BITS); if (r) return r;
r = uw2453_init_mode(chip); if (r) return r;
/* Try all standard VCO configuration settings on channel 1 */ for (i = 0; i < ARRAY_SIZE(uw2453_std_vco_cfg) - 1; i++) { /* Configure synthesizer for channel 1 */
r = uw2453_synth_set_channel(chip, 1, false); if (r) return r;
/* Write VCO config */
r = uw2453_write_vco_cfg(chip, uw2453_std_vco_cfg[i][0]); if (r) return r;
/* ack interrupt event */
r = zd_iowrite16_locked(chip, 0x0f, UW2453_INTR_REG); if (r) return r;
/* check interrupt status */
r = zd_ioread16_locked(chip, &intr_status, UW2453_INTR_REG); if (r) return r;
if (!(intr_status & 0xf)) {
dev_dbg_f(zd_chip_dev(chip), "PLL locked on configuration %d\n", i);
found_config = i; break;
}
}
if (found_config == -1) { /* autocal */
dev_dbg_f(zd_chip_dev(chip), "PLL did not lock, using autocal\n");
r = uw2453_synth_set_channel(chip, 1, true); if (r) return r;
r = uw2453_write_vco_cfg(chip, UW2453_AUTOCAL_VCO_CFG); if (r) return r;
}
/* To match the vendor driver behaviour, we use the configuration after
* the one that produced a lock. */
UW2453_PRIV(rf)->config = found_config + 1;
/* enter IDLE mode */ /* FIXME: shouldn't we go to SLEEP? sent email to zydas */
r = zd_rfwrite_locked(chip, UW2453_REGWRITE(0, 0x25f90), RF_RV_BITS); if (r) return r;
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