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attenuator: Add convenience functions for setting all stages

This commit is contained in:
Harald Welte 2021-05-06 08:26:46 +02:00
parent 5d2e32e4b8
commit 627ead7b21
2 changed files with 59 additions and 0 deletions
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56
projects/rfdsatt/attenuator.c
View File

@ -120,6 +120,62 @@ int attenuator_stage_get(uint8_t channel, uint8_t stage, enum attenuator_value a
}
}
/* set an overall attenuation value for an entire channel */
int attenuator_chan_set(uint8_t channel, uint8_t val_qdb, bool split_equal)
{
uint8_t val_a, val_b;
if (!g_att_cfg)
return -ENODEV;
if (channel >= g_att_cfg->num_channels)
return -ENODEV;
if (val_qdb/4 > 0x3f)
return -ERANGE;
if (split_equal) {
/* first max out one of the two, then start using the other */
val_a = val_qdb / 2;
} else {
/* first max out one of the two, then start using the other */
if (val_qdb < 31*4)
val_a = val_qdb;
else
val_a = 31*4;
}
val_b = val_qdb - val_a; /* account for odd values */
printf("Setting CH%u to %02u + %02u = %03u dB\r\n", channel, val_a/4, val_b/4, val_qdb/4);
_attenuator_stage_set(channel, 0, val_a);
_attenuator_stage_set(channel, 1, val_b);
return 0;
}
/* get the cumulative attenuation of all stages within one channel */
int attenuator_chan_get(uint8_t channel, enum attenuator_value av)
{
uint8_t stage;
int res;
if (!g_att_cfg)
return -ENODEV;
if (channel >= g_att_cfg->num_channels)
return -ENODEV;
for (stage = 0; stage < g_att_cfg->channels[channel].num_stages; stage++) {
int rc = attenuator_stage_get(channel, stage, av);
if (rc < 0)
return rc;
res += rc;
}
return res;
}
/* initialize the attenuator driver */
void attenuator_init(const struct attenuator_cfg *cfg,
struct attenuator_state **state)

3
projects/rfdsatt/attenuator.h
View File

@ -43,3 +43,6 @@ int attenuator_stage_set(uint8_t channel, uint8_t stage, uint8_t val_qdb);
int attenuator_stage_get(uint8_t channel, uint8_t stage, enum attenuator_value av);
void attenuator_init(const struct attenuator_cfg *cfg,
struct attenuator_state **state);
int attenuator_chan_set(uint8_t channel, uint8_t val_qdb, bool split_equal);
int attenuator_chan_get(uint8_t channel, enum attenuator_value av);