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Bluetooth: Controller: df: Fix IQ sample data saturation info drop

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Nordic Semiconductor Radio peripheral provides IQ samples as
12 bits signed integer with sign extended to 16 bits.
Where out of range IQ samples (saturated) have value -32768.

Due to conversion of IQ samples to 8 bit signed integer, required by
BT 5.3 Core Vol 4, Part E sections 7.7.65.21 and 7.7.65.22 the
saturation information was lost.

The PR fixes that issue by use of value -128 to mark saturated
IQ samples. Note that BT 5.3 Core does not give any particular
value of IQ sample a special meaning.

This is a vendor specific solution and does not affect other
implementations of lower link layer.

Signed-off-by: Piotr Pryga <piotr.pryga@nordicsemi.no>
This commit is contained in:
Piotr Pryga 2022-02-04 15:11:36 +01:00 • committed by Carles Cufí
commit d04456f4d9
2 changed files with 19 additions and 5 deletions
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8
subsys/bluetooth/controller/hci/hci.c
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@ -2846,8 +2846,8 @@ static void le_df_connectionless_iq_report(struct pdu_data *pdu_rx,
sep->sample_count = 0U;
} else {
for (uint8_t idx = 0U; idx < samples_cnt; ++idx) {
sep->sample[idx].i = IQ_SHIFT_12_TO_8_BIT(iq_report->sample[idx].i);
sep->sample[idx].q = IQ_SHIFT_12_TO_8_BIT(iq_report->sample[idx].q);
sep->sample[idx].i = IQ_CONVERT_12_TO_8_BIT(iq_report->sample[idx].i);
sep->sample[idx].q = IQ_CONVERT_12_TO_8_BIT(iq_report->sample[idx].q);
}
sep->sample_count = samples_cnt;
@ -2969,8 +2969,8 @@ static void le_df_connection_iq_report(struct node_rx_pdu *node_rx, struct net_b
sep->sample_count = 0U;
} else {
for (uint8_t idx = 0U; idx < samples_cnt; ++idx) {
sep->sample[idx].i = IQ_SHIFT_12_TO_8_BIT(iq_report->sample[idx].i);
sep->sample[idx].q = IQ_SHIFT_12_TO_8_BIT(iq_report->sample[idx].q);
sep->sample[idx].i = IQ_CONVERT_12_TO_8_BIT(iq_report->sample[idx].i);
sep->sample[idx].q = IQ_CONVERT_12_TO_8_BIT(iq_report->sample[idx].q);
}
sep->sample_count = samples_cnt;
}