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本例中，PWM模块输入时钟频率为 1000000Hz， PWM周期为256。 因此，PWM的频率为 1000000/256= 3906Hz=3.906K 占空比分别为： [0xFC8040] 0xFC/256=98.4% 0x80/256 = 50% 0x40/256 = 25% 0x3060b0 0x30/256 = 18.75% 0x60/256 = 37.5% 0xb0/256 = 68.75% void PWM_6ch_test(void) { uint32_t color[2] = {0xFC8040, 0x3060b0}; //RGB pin_config_t pin_cfg[] = { {5, {PINMUX_PAD5_TIMER0_IO2_CFG}, PMU_PIN_MODE_PP, PMU_PIN_DRIVER_CURRENT_NORMAL}, //Timer0 {6, {PINMUX_PAD6_TIMER0_IO3_CFG }, PMU_PIN_MODE_PP, PMU_PIN_DRIVER_CURRENT_NORMAL}, //Timer0 // {12, {PINMUX_PAD12_TIMER1_OUT1_CFG}, PMU_PIN_MODE_PP, PMU_PIN_DRIVER_CURRENT_NORMAL}, //Timer1 // {21, {PINMUX_PAD21_TIMER2_OUT2_CFG}, PMU_PIN_MODE_PP, PMU_PIN_DRIVER_CURRENT_NORMAL}, //Timer2 {22, {PINMUX_PAD22_TIMER2_OUT3_CFG}, PMU_PIN_MODE_PP, PMU_PIN_DRIVER_CURRENT_NORMAL}, //Timer2 {11, {PINMUX_PAD11_TIMER2_OUT4_CFG}, PMU_PIN_MODE_PP, PMU_PIN_DRIVER_CURRENT_NORMAL}, //Timer2 }; // drv_pin_init(pin_cfg, sizeof(pin_cfg) / sizeof(pin_cfg[0])); tim_pwm_complementary_output_config_t pwm_config = { .cnt_freq = 1000000, // PWM 模块输入时钟 1Mhz .chan = { {1, {TIM_PWM_POL_ACTIVE_HIGH, 0}}, {1, {TIM_PWM_POL_ACTIVE_HIGH, 0}}, {1, {TIM_PWM_POL_ACTIVE_HIGH, 0}}, {0, {TIM_PWM_POL_ACTIVE_HIGH, 0}} }, .dma_cfg = { 0, TIM_CHAN_ALL, NULL }, }; pwm_config.period_cnt = 256; //频率=cnt_freq/period_cnt=1000000/256=3906 //定时器0 //通道2 pwm_config.chan[TIM_CHAN_2].cfg.complementary_output_enable = false;//互补输出禁用 pwm_config.chan[TIM_CHAN_2].en = 1; pwm_config.chan[TIM_CHAN_2].cfg.oc_val = (color[0] >> 16) & 0xff; //示例，高8位 //通道3 pwm_config.chan[TIM_CHAN_3].cfg.complementary_output_enable = false; pwm_config.chan[TIM_CHAN_3].en = 1; pwm_config.chan[TIM_CHAN_3].cfg.oc_val = (color[0] >> 8) & 0xff; // pwm_config.chan[TIM_CHAN_1].en = 0;//不使用 pwm_config.chan[TIM_CHAN_4].en = 0;//不使用 drv_tim_init(OM_TIM0); drv_tim_pwm_complementary_output_start(OM_TIM0, &pwm_config); //定时器1 //通道1 pwm_config.chan[TIM_CHAN_1].cfg.complementary_output_enable = false; pwm_config.chan[TIM_CHAN_1].en = 1; pwm_config.chan[TIM_CHAN_1].cfg.oc_val = (color[0] >> 0) & 0xff; // pwm_config.chan[TIM_CHAN_2].en = 0;//不使用 pwm_config.chan[TIM_CHAN_3].en = 0;//不使用 pwm_config.chan[TIM_CHAN_4].en = 0;//不使用 drv_tim_init(OM_TIM1); drv_tim_pwm_complementary_output_start(OM_TIM1, &pwm_config); //定时器2 //通道2 pwm_config.chan[TIM_CHAN_2].cfg.complementary_output_enable = false; pwm_config.chan[TIM_CHAN_2].en = 1; pwm_config.chan[TIM_CHAN_2].cfg.oc_val = (color[1] >> 16) & 0xff; //通道3 pwm_config.chan[TIM_CHAN_3].cfg.complementary_output_enable = false; pwm_config.chan[TIM_CHAN_3].en = 1; pwm_config.chan[TIM_CHAN_3].cfg.oc_val = (color[1] >> 8) & 0xff; //通道4 pwm_config.chan[TIM_CHAN_4].cfg.complementary_output_enable = false; pwm_config.chan[TIM_CHAN_4].en = 1; pwm_config.chan[TIM_CHAN_4].cfg.oc_val = (color[1] >> 0) & 0xff; // pwm_config.chan[TIM_CHAN_1].en = 0;//不使用 drv_tim_init(OM_TIM2); drv_tim_pwm_complementary_output_start(OM_TIM2, &pwm_config); while (1); } int main(void) { drv_pmu_pin_io13_reset_mode_enable(1); #if CPU_CLK_Select_64MHz drv_pmu_xtal32m_x2_startup(); #endif ………… // drv_wdt_init(0); board_init(); extern void PWM_6ch_test(void); PWM_6ch_test(); //测试 …………
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