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新手求助,我想用DMA控制PWM占空比以控制舵机转动,在占空比减少的情况下没有问题,可是在占空比累加的情况下只会输出最后一个数据,增加每两个数据之间的差值情况会有所好转,但是还是会存在一定问题,请问是什么原因?
测试数据: 累加:300,309,319,328,338,348,357,367,376,386,396,405,415,424,434,444,453,463,472,482,492,501,511,520,530,540,549,559,568,578,588,597,607,616,626,636,645,655,664,674,684,693,703,712,722,732,741,751,760,770, 累减:780,770,760,751,741,732,722,712,703,693,684,674,664,655,645,636,626,616,607,597,588,578,568,559,549,540,530,520,511,501,492,482,472,463,453,444,434,424,415,405,396,386,376,367,357,348,338,328,319,309, 程序配置: DMA_Config(uint_16t* action_buf, uint_16t action_size) { RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, input_state); DMA_InitTypeDef DMA_InitStructure; DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)action_buf; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; DMA_InitStructure.DMA_BufferSize = action_size; DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; DMA_InitStructure.DMA_Priority = DMA_Priority_Medium; DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; DMA_InitStructure.DMA_PeripheralBaseAddr = TIM1_BASE + 0x34; DMA_Init(DMA1_Channel3, &DMA_InitStructure); DMA_ITConfig(DMA1_Channel3, DMA_IT_TC, ENABLE); TIM_DMACmd(TIM1, TIM_DMA_CC1, ENABLE); DMA_Cmd(DMA1_Channel3, ENABLE); } |
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14个回答
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配置有问题吧?
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主要在传输数据递减的情况下是正常的,累加的情况下会出现直接传输最后一个数据的情况。我用示波器看了下,占空比在数据累加的情况下也是直接跳转到最后一个数据的占空比。 |
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累加和累减的程序看一下
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肯定程序有问题
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程序不完整,缺少TIM的初始化代码!input_state状态不明
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官方例程,供你参考!
/* Private typedef -----------------------------------------------------------*/ /* Private define ------------------------------------------------------------*/ #define TIM1_CCR3_Address 0x40012C3C /* Private macro -------------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/ TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; TIM_OCInitTypeDef TIM_OCInitStructure; uint16_t SRC_Buffer[3] = {0, 0, 0}; uint16_t TimerPeriod = 0; /* Private function prototypes -----------------------------------------------*/ void RCC_Configuration(void); void GPIO_Configuration(void); void DMA_Configuration(void); /* Private functions ---------------------------------------------------------*/ /** * @brief Main program * @param None * @retval None */ int main(void) { /*!< At this stage the microcontroller clock setting is already configured, this is done through SystemInit() function which is called from startup file (startup_stm32f10x_xx.s) before to branch to application main. To reconfigure the default setting of SystemInit() function, refer to system_stm32f10x.c file */ /* System Clocks Configuration */ RCC_Configuration(); /* GPIO Configuration */ GPIO_Configuration(); /* DMA Configuration */ DMA_Configuration(); /* TIM1 DMA Transfer example ------------------------------------------------- TIM1CLK = SystemCoreClock, Prescaler = 0, TIM1 counter clock = SystemCoreClock SystemCoreClock is set to 72 MHz for Low-density, Medium-density, High-density and Connectivity line devices and to 24 MHz for Low-Density Value line and Medium-Density Value line devices. The objective is to configure TIM1 channel 3 to generate complementary PWM signal with a frequency equal to 17.57 KHz: - TIM1_Period = (SystemCoreClock / 17570) - 1 and a variable duty cycle that is changed by the DMA after a specific number of Update DMA request. The number of this repetitive requests is defined by the TIM1 Repetition counter, each 3 Update Requests, the TIM1 Channel 3 Duty Cycle changes to the next new value defined by the SRC_Buffer . -----------------------------------------------------------------------------*/ /* Compute the value to be set in ARR register to generate signal frequency at 17.57 Khz */ TimerPeriod = (SystemCoreClock / 17570 ) - 1; /* Compute CCR1 value to generate a duty cycle at 50% */ SRC_Buffer[0] = (uint16_t) (((uint32_t) 5 * (TimerPeriod - 1)) / 10); /* Compute CCR1 value to generate a duty cycle at 37.5% */ SRC_Buffer[1] = (uint16_t) (((uint32_t) 375 * (TimerPeriod - 1)) / 1000); /* Compute CCR1 value to generate a duty cycle at 25% */ SRC_Buffer[2] = (uint16_t) (((uint32_t) 25 * (TimerPeriod - 1)) / 100); /* TIM1 Peripheral Configuration --------------------------------------------*/ /* Time Base configuration */ TIM_TimeBaseStructure.TIM_Prescaler = 0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseStructure.TIM_Period = TimerPeriod; TIM_TimeBaseStructure.TIM_ClockDivision = 0; TIM_TimeBaseStructure.TIM_RepetitionCounter = 2; TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); /* Channel 3 Configuration in PWM mode */ TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; TIM_OCInitStructure.TIM_Pulse = SRC_Buffer[0]; TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low; TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set; TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset; TIM_OC3Init(TIM1, &TIM_OCInitStructure); /* TIM1 Update DMA Request enable */ TIM_DMACmd(TIM1, TIM_DMA_Update, ENABLE); /* TIM1 counter enable */ TIM_Cmd(TIM1, ENABLE); /* Main Output Enable */ TIM_CtrlPWMOutputs(TIM1, ENABLE); while (1) {} } /** * @brief Configures the different system clocks. * @param None * @retval None */ void RCC_Configuration(void) { /* TIM1, GPIOA and GPIOB clock enable */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 | RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE); /* DMA clock enable */ RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); } /** * @brief Configure the TIM1 Pins. * @param None * @retval None */ void GPIO_Configuration(void) { GPIO_InitTypeDef GPIO_InitStructure; /* GPIOA Configuration: Channel 3 as alternate function push-pull */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); /* GPIOB Configuration: Channel 3N as alternate function push-pull */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15; GPIO_Init(GPIOB, &GPIO_InitStructure); } /** * @brief Configures the DMA. * @param None * @retval None */ void DMA_Configuration(void) { DMA_InitTypeDef DMA_InitStructure; /* DMA1 Channel5 Config */ DMA_DeInit(DMA1_Channel5); DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)TIM1_CCR3_Address; DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)SRC_Buffer; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; DMA_InitStructure.DMA_BufferSize = 3; DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; DMA_InitStructure.DMA_Priority = DMA_Priority_High; DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; DMA_Init(DMA1_Channel5, &DMA_InitStructure); /* DMA1 Channel5 enable */ DMA_Cmd(DMA1_Channel5, ENABLE); } |
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官方提供了很多外设的使用例程,多看看还是有帮助的
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累加和累减的程序看一下
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这个程序看不出什么问题,问题解决了吗?
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定时器要开启在更新时触发DMA。
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