From a4f2283384aefba817e08e73c6e129968d492793 Mon Sep 17 00:00:00 2001 From: redchenjs Date: Tue, 18 Jun 2019 13:52:36 +0800 Subject: [PATCH] i2s: fix a bug when calculating i2s apll parameters 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 --- components/driver/i2s.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/components/driver/i2s.c b/components/driver/i2s.c index 480cd98ef..0d33a45b9 100644 --- a/components/driver/i2s.c +++ b/components/driver/i2s.c @@ -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 ++) {