原始代码
[C] 纯文本查看 复制代码 /*
*********************************************************************************************************
* 函 数 名: TIM1_Config
* 功能说明: 配置定时器1，用于触发ADC1，ADC2和ADC3。
* 当外部触发信号被选为ADC规则或注入转换时，只有它的上升沿可以启动转换。
* 形 参: 无
* 返 回 值: 无
*********************************************************************************************************
*/
static void TIM1_Config(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
/* 使能定时器1 */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
/* 先禁能再配置 */
TIM_Cmd(TIM1, DISABLE);
/*
********************************************************************************
system_stm32f4xx.c 文件中 void SetSysClock(void) 函数对时钟的配置如下：
HCLK = SYSCLK / 1 (AHB1Periph)
PCLK2 = HCLK / 2 (APB2Periph)
PCLK1 = HCLK / 4 (APB1Periph)
因为APB1 prescaler != 1, 所以 APB1上的TIMxCLK = PCLK1 x 2 = SystemCoreClock / 2;
因为APB2 prescaler != 1, 所以 APB2上的TIMxCLK = PCLK2 x 2 = SystemCoreClock;
APB1 定时器有 TIM2, TIM3 ,TIM4, TIM5, TIM6, TIM7, TIM12, TIM13, TIM14
APB2 定时器有 TIM1, TIM8 ,TIM9, TIM10, TIM11
TIM1 更新周期是 = TIM1CLK / （TIM_Period + 1）/（TIM_Prescaler + 1）
********************************************************************************
*/
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure); //初始化定时器1的寄存器为复位值
TIM_TimeBaseStructure.TIM_Period = 168000000/g_SampleFreqTable[TimeBaseId][0] - 1; //ARR自动重装载寄存器周期的值(定时时间）到设置频率后产生个更新或者中断(也是说定时时间到)
TIM_TimeBaseStructure.TIM_Prescaler = g_SampleFreqTable[TimeBaseId][1]-1; //PSC时钟预分频数 例如：时钟频率=TIM1CLK/(时钟预分频+1)
TIM_TimeBaseStructure.TIM_ClockDivision = 0x0; //CR1->CKD时间分割值
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //CR1->CMS[1:0]和DIR定时器模式 向上计数
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x0000; /* TIM1 和 TIM8 必须设置 */
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
/**************ADC1的触发***********************************************/
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //CCMR2在向上计数时，一旦TIMx_CNT<TIMx_CCR1时通道1为有效电平，否则为无效电平
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //CCER 输出使能
TIM_OCInitStructure.TIM_Pulse = TIM_TimeBaseStructure.TIM_Period/3;//CCR3同计数器TIMx_CNT的比较，并在OC1端口上产生输出信号
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //CCER输出极性设置
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; /* only for TIM1 and TIM8. 此处和正相引脚不同 */
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High; /* only for TIM1 and TIM8. */
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset; /* only for TIM1 and TIM8. */
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset; /* only for TIM1 and TIM8. */
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
/**************ADC2的触发***********************************************/
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = TIM_TimeBaseStructure.TIM_Period*2/3;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; /* only for TIM1 and TIM8. 此处和正相引脚不同 */
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High; /* only for TIM1 and TIM8. */
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset; /* only for TIM1 and TIM8. */
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset; /* only for TIM1 and TIM8. */
TIM_OC2Init(TIM1, &TIM_OCInitStructure);
/**************ADC3的触发***********************************************/
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = TIM_TimeBaseStructure.TIM_Period-1;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; /* only for TIM1 and TIM8. 此处和正相引脚不同 */
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High; /* only for TIM1 and TIM8. */
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset; /* only for TIM1 and TIM8. */
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset; /* only for TIM1 and TIM8. */
TIM_OC3Init(TIM1, &TIM_OCInitStructure);
//TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable); //CMR2 设置预装载使能 更新事件产生时写入有效
//TIM_ARRPreloadConfig(TIM1, ENABLE); //CR1 设置ARR自动重装 更新事件产生时写入有效
TIM_Cmd(TIM1, ENABLE);
/* 使能PWM输出 */
TIM_CtrlPWMOutputs(TIM1, ENABLE);
}
| 
发表于 2024-1-31 10:08:39
发表于 2024-1-31 10:20:50
楼主
