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[layer1] FBSB: abort FB0 acquisition after 30 failing attempts 

This should remove the 'endless FB0 loop' when the DSP detects a FB
where there really is none, and we drive the AFC DAC to its maximum
without ever getting the frequency offset below our threshold.
This commit is contained in:
Harald Welte 2010-06-20 17:26:27 +02:00
parent c1168aaec2
commit 86074fce2e
1 changed files with 13 additions and 4 deletions
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17
src/target/firmware/layer1/prim_fbsb.c
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@ -50,6 +50,7 @@
#include <l1a_l23_interface.h>
#define FB0_RETRY_COUNT 3
#define AFC_RETRY_COUNT 30
extern uint16_t rf_arfcn; // TODO
@ -75,6 +76,7 @@ struct l1a_fb_state {
struct l1ctl_fbsb_req req;
int16_t initial_freq_err;
uint8_t fb_retries;
uint8_t afc_retries;
};
static struct l1a_fb_state fbs;
@ -442,11 +444,18 @@ static int l1s_fbdet_resp(__unused uint8_t p1, uint8_t attempt,
tdma_sched_reset();
/* FIXME: don't only use the last but an average */
if (abs(last_fb->freq_diff) < fbs.req.freq_err_thresh1 &&
last_fb->snr > FB0_SNR_THRESH)
last_fb->snr > FB0_SNR_THRESH) {
/* continue with FB1 task in DSP */
tdma_schedule_set(1, fb_sched_set, 1);
else {
/* FIXME: check timeout */
tdma_schedule_set(1, fb_sched_set, 0);
} else {
if (fbs.afc_retries < AFC_RETRY_COUNT) {
tdma_schedule_set(1, fb_sched_set, 0);
fbs.afc_retries++;
} else {
/* Abort */
last_fb->attempt = 13;
l1s_compl_sched(L1_COMPL_FB);
}
}
} else
l1s_compl_sched(L1_COMPL_FB);