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Fix LEDC resolution calculation on ESP32-C3/S2/S3 (#2794)
Co-authored-by: Oxan van Leeuwen <oxan@oxanvanleeuwen.nl> Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>
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1 changed files with 17 additions and 5 deletions
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@ -16,6 +16,7 @@ namespace ledc {
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static const char *const TAG = "ledc.output";
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#ifdef USE_ESP_IDF
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static const int MAX_RES_BITS = LEDC_TIMER_BIT_MAX - 1;
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#if SOC_LEDC_SUPPORT_HS_MODE
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// Only ESP32 has LEDC_HIGH_SPEED_MODE
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inline ledc_mode_t get_speed_mode(uint8_t channel) { return channel < 8 ? LEDC_HIGH_SPEED_MODE : LEDC_LOW_SPEED_MODE; }
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@ -25,20 +26,27 @@ inline ledc_mode_t get_speed_mode(uint8_t channel) { return channel < 8 ? LEDC_H
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// https://docs.espressif.com/projects/esp-idf/en/latest/esp32c3/api-reference/peripherals/ledc.html#functionality-overview
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inline ledc_mode_t get_speed_mode(uint8_t) { return LEDC_LOW_SPEED_MODE; }
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#endif
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#else
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static const int MAX_RES_BITS = 20;
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#endif
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float ledc_max_frequency_for_bit_depth(uint8_t bit_depth) { return 80e6f / float(1 << bit_depth); }
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float ledc_min_frequency_for_bit_depth(uint8_t bit_depth) {
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const float max_div_num = ((1 << 20) - 1) / 256.0f;
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float ledc_min_frequency_for_bit_depth(uint8_t bit_depth, bool low_frequency) {
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const float max_div_num = ((1 << MAX_RES_BITS) - 1) / (low_frequency ? 32.0f : 256.0f);
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return 80e6f / (max_div_num * float(1 << bit_depth));
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}
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optional<uint8_t> ledc_bit_depth_for_frequency(float frequency) {
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for (int i = 20; i >= 1; i--) {
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const float min_frequency = ledc_min_frequency_for_bit_depth(i);
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ESP_LOGD(TAG, "Calculating resolution bit-depth for frequency %f", frequency);
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for (int i = MAX_RES_BITS; i >= 1; i--) {
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const float min_frequency = ledc_min_frequency_for_bit_depth(i, (frequency < 100));
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const float max_frequency = ledc_max_frequency_for_bit_depth(i);
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if (min_frequency <= frequency && frequency <= max_frequency)
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if (min_frequency <= frequency && frequency <= max_frequency) {
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ESP_LOGD(TAG, "Resolution calculated as %d", i);
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return i;
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}
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}
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return {};
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}
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@ -80,6 +88,10 @@ void LEDCOutput::setup() {
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auto chan_num = static_cast<ledc_channel_t>(channel_ % 8);
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bit_depth_ = *ledc_bit_depth_for_frequency(frequency_);
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if (bit_depth_ < 1) {
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ESP_LOGW(TAG, "Frequency %f can't be achieved with any bit depth", frequency_);
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this->status_set_warning();
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}
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ledc_timer_config_t timer_conf{};
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timer_conf.speed_mode = speed_mode;
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