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i2s: fix a bug when calculating i2s apll parameters

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Closes https://github.com/espressif/esp-idf/issues/2634
Closes https://github.com/espressif/esp-idf/issues/3380
Fixes https://github.com/espressif/esp-idf/issues/3407
This commit is contained in:
redchenjs 2019-06-18 13:52:36 +08:00 committed by Mahavir Jain
parent cbec031c91
commit a4f2283384
1 changed files with 12 additions and 2 deletions
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14
components/driver/i2s.c
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@ -249,7 +249,7 @@ static esp_err_t i2s_apll_calculate_fi2s(int rate, int bits_per_sample, int *sdm
max_rate = i2s_apll_get_fi2s(bits_per_sample, 255, 255, _sdm2, 0);
min_rate = i2s_apll_get_fi2s(bits_per_sample, 0, 0, _sdm2, 31);
avg = (max_rate + min_rate)/2;
if(abs(avg - rate) < min_diff) {
if (abs(avg - rate) < min_diff) {
min_diff = abs(avg - rate);
*sdm2 = _sdm2;
}
@ -259,11 +259,21 @@ static esp_err_t i2s_apll_calculate_fi2s(int rate, int bits_per_sample, int *sdm
max_rate = i2s_apll_get_fi2s(bits_per_sample, 255, 255, *sdm2, _odir);
min_rate = i2s_apll_get_fi2s(bits_per_sample, 0, 0, *sdm2, _odir);
avg = (max_rate + min_rate)/2;
if(abs(avg - rate) < min_diff) {
if (abs(avg - rate) < min_diff) {
min_diff = abs(avg - rate);
*odir = _odir;
}
}
min_diff = APLL_MAX_FREQ;
for (_sdm2 = 4; _sdm2 < 9; _sdm2 ++) {
max_rate = i2s_apll_get_fi2s(bits_per_sample, 255, 255, _sdm2, *odir);
min_rate = i2s_apll_get_fi2s(bits_per_sample, 0, 0, _sdm2, *odir);
avg = (max_rate + min_rate)/2;
if (abs(avg - rate) < min_diff) {
min_diff = abs(avg - rate);
*sdm2 = _sdm2;
}
}
min_diff = APLL_MAX_FREQ;
for (_sdm1 = 0; _sdm1 < 256; _sdm1 ++) {