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Added write to the si modem DSM_CTRL register, allow even deviation values (potentially could lead to spurs but probs not)

master
Richard Meadows 2015-07-11 12:51:34 +01:00
rodzic f1babfd5a8
commit a518ed92f9
2 zmienionych plików z 20 dodań i 5 usunięć
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5
firmware/inc/si_trx_defs.h
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@ -235,6 +235,11 @@ enum {
SI_MODEM_MOD_GPIO_3 = (0x03 << 5),
SI_MODEM_MOD_DIRECT_MODE_SYNC = (0x00 << 7), /* default */
SI_MODEM_MOD_DIRECT_MODE_ASYNC = (0x01 << 7),
SI_MODEM_MAP_CONTROL = 0x01,
SI_MODEM_DSM_CTRL = 0x02,
SI_MODEM_DSM_CTRL_NOFORCE_DSM_LSB = (0x00 << 2),
SI_MODEM_DSM_CTRL_FORCE_DSM_LSB = (0x01 << 2), /* default */
SI_MODEM_DSM_CTRL_MASH_1_1_1 = (0x03 << 0), /* default */
SI_MODEM_DATA_RATE = 0x03,
SI_MODEM_TX_NCO_MODE = 0x06,
SI_MODEM_TX_NCO_TXOSR_10X = (0x00 << 26),

20
firmware/src/si_trx.c
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@ -243,6 +243,16 @@ static void si_trx_frequency_control_set_band(uint8_t band, uint8_t sy_sel)
SI_MODEM_CLKGEN_BAND,
sy_sel | (band & 0x7));
}
/**
* Set the control word of the modem delta-sigma modulator
*/
static void si_trx_modem_set_dsm_ctrl(uint8_t ctrl_word)
{
_si_trx_set_property_8(SI_PROPERTY_GROUP_MODEM,
SI_MODEM_DSM_CTRL,
ctrl_word);
}
/**
* Sets the modem frequency deviation. This is how much the external
* pin deviates the synthesiser from the centre frequency. In units of
@ -346,9 +356,6 @@ static void si_trx_set_tx_pa_duty_cycle(uint8_t pa_duty_cycle)
}
/**
* Set the synthesiser to the given frequency.
*
@ -402,11 +409,14 @@ static float si_trx_set_frequency(uint32_t frequency, uint16_t deviation)
si_trx_frequency_control_set_band(band, SI_MODEM_CLKGEN_SY_SEL_1);
}
/* Set the frac-n PLL divisior */
si_trx_frequency_control_set_divider(n, m);
/* Set the external pin frequency deviation to the LSB tuning resoultion */
/* Set the modem dsm control word. Allow even deviation values */
si_trx_modem_set_dsm_ctrl(SI_MODEM_DSM_CTRL_NOFORCE_DSM_LSB |
SI_MODEM_DSM_CTRL_MASH_1_1_1);
/* Set the modem frequency deviation (for the external pin)*/
si_trx_modem_set_deviation(deviation);
/* Return the LSB tuning resolution of the frac-n pll synthesiser. */