a1012112796/test_rtt_413
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pwm 驱动优化

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实测发现, 改为低电平作为有效电平后，输出脉宽更准确一些，
故作此修改。另外移除了一段无效代码逻辑，降低理解负担。

Signed-off-by: a1012112796 <1012112796@qq.com>
This commit is contained in:
a1012112796
2024-01-24 13:55:07 +08:00
parent 32d8112577
commit 12dbf59150
1 changed files with 2 additions and 9 deletions
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11
libraries/HAL_Drivers/drv_pwm.c
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@@ -264,14 +264,6 @@ static rt_err_t drv_pwm_get(TIM_HandleTypeDef *htim, struct rt_pwm_configuration
rt_uint64_t tim_clock; rt_uint64_t tim_clock;
tim_clock = tim_clock_get(htim); tim_clock = tim_clock_get(htim);
if (__HAL_TIM_GET_CLOCKDIVISION(htim) == TIM_CLOCKDIVISION_DIV2)
{
tim_clock = tim_clock / 2;
}
else if (__HAL_TIM_GET_CLOCKDIVISION(htim) == TIM_CLOCKDIVISION_DIV4)
{
tim_clock = tim_clock / 4;
}
/* Convert nanosecond to frequency and duty cycle. 1s = 1 * 1000 * 1000 * 1000 ns */ /* Convert nanosecond to frequency and duty cycle. 1s = 1 * 1000 * 1000 * 1000 ns */
tim_clock /= 1000000UL; tim_clock /= 1000000UL;
@@ -357,6 +349,7 @@ static rt_err_t drv_pwm_set_pulse(TIM_HandleTypeDef *htim, struct rt_pwm_configu
tim_clock /= 1000000UL; tim_clock /= 1000000UL;
period = (__HAL_TIM_GET_AUTORELOAD(htim) + 1) * (htim->Instance->PSC + 1) * 1000UL / tim_clock; period = (__HAL_TIM_GET_AUTORELOAD(htim) + 1) * (htim->Instance->PSC + 1) * 1000UL / tim_clock;
configuration->pulse = period - configuration->pulse; // 改为低电平有效，故需要计算一下低电平的脉宽
pulse = (rt_uint64_t)configuration->pulse * (__HAL_TIM_GET_AUTORELOAD(htim) + 1) / period; pulse = (rt_uint64_t)configuration->pulse * (__HAL_TIM_GET_AUTORELOAD(htim) + 1) / period;
if (pulse < MIN_PULSE) if (pulse < MIN_PULSE)
@@ -452,7 +445,7 @@ static rt_err_t stm32_hw_pwm_init(struct stm32_pwm *device)
oc_config.OCMode = TIM_OCMODE_PWM1; oc_config.OCMode = TIM_OCMODE_PWM1;
oc_config.Pulse = 0; oc_config.Pulse = 0;
oc_config.OCPolarity = TIM_OCPOLARITY_HIGH; oc_config.OCPolarity = TIM_OCPOLARITY_LOW;
oc_config.OCFastMode = TIM_OCFAST_DISABLE; oc_config.OCFastMode = TIM_OCFAST_DISABLE;
oc_config.OCNIdleState = TIM_OCNIDLESTATE_RESET; oc_config.OCNIdleState = TIM_OCNIDLESTATE_RESET;
oc_config.OCIdleState = TIM_OCIDLESTATE_RESET; oc_config.OCIdleState = TIM_OCIDLESTATE_RESET;