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仅为三色中性光启用低亮PDM

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吴琪
2026-07-28 12:15:52 +08:00
parent 44ad781943
commit b5495492a7
1 changed files with 38 additions and 0 deletions
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project/example/ble/ble_peripheral/app/src/bridge_pwm.c
+38
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@@ -18,6 +18,7 @@
* The available OFF time is distributed around both direction changes and
* each W/C transition retains at least 25 us protection.
* Normal dual-color output produces one pulse per color per frame (2 kHz).
* Only the low-output neutral section of three-color breathing uses PDM.
*/
#define BRIDGE_PWM_SCALE 1000U
#define BRIDGE_PWM_PERIOD 6U
@@ -26,8 +27,11 @@
#define BRIDGE_DEADTIME_US 25U
#define BRIDGE_DUAL_ACTIVE_US 450U
#define BRIDGE_MIN_DUAL_PULSE_US 1U
#define BRIDGE_NEUTRAL_PDM_PULSE_US 50U
#define BRIDGE_TIMER_TICKS_PER_US 16U
#define BRIDGE_PDM_THRESHOLD (BRIDGE_MIX_SCALE * 4096UL)
#define BRIDGE_NEUTRAL_PDM_THRESHOLD \
(BRIDGE_NEUTRAL_PDM_PULSE_US * BRIDGE_PDM_THRESHOLD)
#define BRIDGE_GPIO_PORT 0U
#define BRIDGE_GPIO_MASK ((1UL << IO_PWM_W) | (1UL << IO_PWM_C))
@@ -383,6 +387,40 @@ __RAM_CODE void Bridge_Service_1ms(void)
goto dual_output_ready;
}
/*
* In the neutral part of three-color breathing, keep each W/C pulse at
* a reliable 50 us and reduce only its frame density below that level.
* Single-color breathing never enters this branch and stays on hardware
* PWM all the way down to zero.
*/
if (deviceStatus != POWEROFF &&
Mode == mode1 && choose_mode_falsg == 5U &&
w_mix != 0U && c_mix != 0U) {
pdm_w_step =
BRIDGE_DUAL_ACTIVE_US * ((uint32_t)w_mix << 12);
pdm_c_step =
BRIDGE_DUAL_ACTIVE_US * ((uint32_t)c_mix << 12);
if (pdm_w_step < BRIDGE_NEUTRAL_PDM_THRESHOLD &&
pdm_c_step < BRIDGE_NEUTRAL_PDM_THRESHOLD) {
next_w_us = BRIDGE_NEUTRAL_PDM_PULSE_US;
next_c_us = BRIDGE_NEUTRAL_PDM_PULSE_US;
total_off_us =
BRIDGE_FRAME_US -
(2U * BRIDGE_NEUTRAL_PDM_PULSE_US);
next_wc_off_us = (uint16_t)(total_off_us / 2U);
next_cw_off_us =
(uint16_t)(total_off_us - next_wc_off_us);
next_pdm_w_step = pdm_w_step;
next_pdm_c_step = pdm_c_step;
next_pdm_threshold = BRIDGE_NEUTRAL_PDM_THRESHOLD;
next_pdm_enabled = 1U;
cached_w_mix = (uint16_t)w_mix;
cached_c_mix = (uint16_t)c_mix;
goto dual_output_ready;
}
}
if (next_pdm_enabled) {
cached_w_mix = 0xFFFFU;
cached_c_mix = 0xFFFFU;