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Code Issues Releases Activity

LP-585 Add comments + typo

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This commit is contained in:
Laurent Lalanne 2018-03-13 23:05:32 +01:00
parent 131a6b0a34
commit be794a0594
1 changed files with 24 additions and 18 deletions
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42
flight/pios/common/pios_rfm22b.c
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@ -339,26 +339,26 @@ static const uint32_t data_rate[] = {
static const uint8_t channel_spacing[] = {
1, /* 9.6kbps */
2, /* 19.2kps */
2, /* 32kps */
2, /* 57.6kps */
2, /* 64kps */
3, /* 100kps */
4, /* 128kps */
4, /* 192kps */
4, /* 256kps */
2, /* 19.2kbps */
2, /* 32kbps */
2, /* 57.6kbps */
2, /* 64kbps */
3, /* 100kbps */
4, /* 128kbps */
4, /* 192kbps */
4, /* 256kbps */
};
static const uint8_t channel_limits[] = {
1, /* 9.6kbps */
1, /* 19.2kps */
1, /* 32kps */
1, /* 57.6kps */
1, /* 64kps */
1, /* 100kps */
2, /* 128kps */
2, /* 192kps */
2, /* 256kps */
1, /* 19.2kbps */
1, /* 32kbps */
1, /* 57.6kbps */
1, /* 64kbps */
1, /* 100kbps */
2, /* 128kbps */
2, /* 192kbps */
2, /* 256kbps */
};
static const uint8_t reg_1C[] = { 0x01, 0x05, 0x06, 0x95, 0x95, 0x81, 0x88, 0x8B, 0x8D }; // rfm22_if_filter_bandwidth
@ -2681,11 +2681,16 @@ static void rfm22_hmac_sha1(const uint8_t *data, size_t len,
static bool rfm22_gen_channels(uint32_t coordid, enum rfm22b_datarate rate, uint8_t min,
uint8_t max, uint8_t channels[MAX_CHANNELS], uint8_t *clen)
{
uint32_t data = 0;
uint8_t cpos = 0;
// Define first and last channel to be used within min/max values
// according to the frequency deviation, without up/down overflow.
uint8_t chan_min_limit = min + channel_limits[rate];
uint8_t chan_max_limit = max - channel_limits[rate];
// Define how many channels we can use according to the spacing.
uint8_t chan_count = ((chan_max_limit - chan_min_limit) / channel_spacing[rate]) + 1;
uint32_t data = 0;
uint8_t cpos = 0;
uint8_t key[SHA1_DIGEST_LENGTH] = { 0 };
uint8_t digest[SHA1_DIGEST_LENGTH];
uint8_t *all_channels;
@ -2694,6 +2699,7 @@ static bool rfm22_gen_channels(uint32_t coordid, enum rfm22b_datarate rate, uint
memcpy(key, &coordid, sizeof(coordid));
// Fill all_channels[] with usable channels
for (int i = 0; i < chan_count; i++) {
all_channels[i] = chan_min_limit + (i * channel_spacing[rate]);
}