{{stm32f407-ys-explorer - test.zip(uploading…)}}{{stm32f407-ys-explorer - test.zip(uploading…)}}
想请大家看看我配置的PWM哪里出现了问题{{stm32f407-ys-explorer - test.zip(uploading…)}}

include “board.h”

extern void HAL_TIM_MspPostInit(TIM_HandleTypeDef *htim);

TIM_HandleTypeDef htim3;
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct;
RCC_ClkInitTypeDef RCC_ClkInitStruct;

__HAL_RCC_PWR_CLK_ENABLE(); //使能PWR时钟

__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1); //设置调压器输出电压级别1

RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE; // 外部晶振，8MHz
RCC_OscInitStruct.HSEState = RCC_HSE_ON; //打开HSE
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; //打开PLL
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE; //PLL时钟源选择HSE
RCC_OscInitStruct.PLL.PLLM = 8; //8分频MHz
RCC_OscInitStruct.PLL.PLLN = 336; //336倍频
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2; //2分频，得到168MHz主时钟
RCC_OscInitStruct.PLL.PLLQ = 7; //USB/SDIO/随机数产生器等的主PLL分频系数
HAL_RCC_OscConfig(&RCC_OscInitStruct);

RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; // 系统时钟：168MHz
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; // AHB时钟： 168MHz
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4; // APB1时钟：42MHz
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2; // APB2时钟：84MHz
HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5);

HAL_RCC_EnableCSS(); // 使能CSS功能，优先使用外部晶振，内部时钟源为备用

 // HAL_RCC_GetHCLKFreq()/1000    1ms中断一次
// HAL_RCC_GetHCLKFreq()/100000     10us中断一次
// HAL_RCC_GetHCLKFreq()/1000000 1us中断一次

HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000); // 配置并启动系统滴答定时器
/ 系统滴答定时器时钟源 /
HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);

/ 系统滴答定时器中断优先级配置 /
HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
}

void MX_TIM3_Init(void)
{

TIM_ClockConfigTypeDef sClockSourceConfig;

TIM_MasterConfigTypeDef sMasterConfig;
TIM_OC_InitTypeDef sConfigOC;

htim3.Instance = TIM3;
htim3.Init.Prescaler = 0;
htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
htim3.Init.Period = 0;
htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
if (HAL_TIM_PWM_Init(&htim3) != HAL_OK)
{
Error_Handler();
}

sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;

HAL_TIM_ConfigClockSource(&htim3, &sClockSourceConfig);

sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}

sConfigOC.OCMode = TIM_OCMODE_PWM1;
sConfigOC.Pulse = 0;
sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
if (HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)
{
Error_Handler();
}

sConfigOC.Pulse = 0;
if (HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_2) != HAL_OK)
{
Error_Handler();
}

HAL_TIM_MspPostInit(&htim3);

}

#include

include

include

define PWM_DEV_NAME “pwm3” / PWM设备名称 /

define PWM_DEV_CHANNEL 1 / PWM通道 /

struct rt_device_pwm pwm_dev; / PWM设备句柄 */

static int pwm_led_sample(int argc, char *argv[])
{
rt_uint32_t period, pulse;

period = 1000;    /* 周期为0.5ms，单位为纳秒ns */
            /* PWM脉冲宽度值的增减方向 */
pulse = 500;          /* PWM脉冲宽度值，单位为纳秒ns */
/* 查找设备 */
pwm_dev = (struct rt_device_pwm *)rt_device_find(PWM_DEV_NAME);
if (pwm_dev == RT_NULL)
{
    rt_kprintf("pwm sample run failed! can't find %s device!\n", PWM_DEV_NAME);
    return RT_ERROR;
}
/* 设置PWM周期和脉冲宽度默认值 */
rt_pwm_set(pwm_dev, PWM_DEV_CHANNEL, period, pulse);
/* 使能设备 */
rt_pwm_enable(pwm_dev, PWM_DEV_CHANNEL);       
    /* 设置PWM周期和脉冲宽度 */
 rt_pwm_set(pwm_dev, PWM_DEV_CHANNEL, period, pulse);

}

/ 导出到 msh 命令列表中 /
MSH_CMD_EXPORT(pwm_led_sample, pwm sample);