芯片爲STM32F407ZG,使用的是高級定時器TIM1的PWM互補PWM輸出。
效果:
函數
總體的:(通道0~3分別是CH一、CH1N、CH二、CH2N。)
細節:
測試
CH1和CH1N的死區時間是0.375us(公式算出來應該是公式0.3us左右,跟邏輯分析儀的採樣頻率有關係)
CH1和CH二、CH1N和CH2N是同步的,之前作H橋的話就須要這種吧(對角同時導通),有相位差的後面再研究。
spa
STM32CubeMX配置:
main函數
調試
/* USER CODE BEGIN 2 */ /****普通定時器***/ HAL_TIM_PWM_Start(&htim2,TIM_CHANNEL_1); /****高級定時器互補輸出***/ HAL_TIM_PWM_Start(&htim1,TIM_CHANNEL_1); HAL_TIM_PWM_Start(&htim1,TIM_CHANNEL_2); HAL_TIMEx_PWMN_Start(&htim1,TIM_CHANNEL_1); HAL_TIMEx_PWMN_Start(&htim1,TIM_CHANNEL_2); /****寄存器方法修改比較寄存器的值,ARR的值cube配置爲1000***/ TIM1->CCR1=249; TIM1->CCR2=249; /* USER CODE END 2 */
說明:
代碼中普通定時器只是爲了測試!
高級定時器與普通定時器用法有微笑區別,網上查資料老是誤導,不少教程都提到要用HAL_TIMEx_PWMN_Start(&htim1,TIM_CHANNEL_1)這一句,可是隻有這一句CH1N會有輸出,CH1就沒了,走了很多彎路。
code
細看高級定時器的函數名,一個是PWM、一個是PWMN,而HAL_TIMEx_PWMN_Start與HAL_TIM_PWM_Start相比多了一個Ex,所在的.c文件也不相同。猜測帶Ex的多是擴展功能吧blog
再來看看死區時間計算吧:
cubemx生成的代碼以下:
教程
void MX_TIM1_Init(void) { TIM_ClockConfigTypeDef sClockSourceConfig = {0}; TIM_MasterConfigTypeDef sMasterConfig = {0}; TIM_OC_InitTypeDef sConfigOC = {0}; TIM_BreakDeadTimeConfigTypeDef sBreakDeadTimeConfig = {0}; htim1.Instance = TIM1; htim1.Init.Prescaler = 167; htim1.Init.CounterMode = TIM_COUNTERMODE_UP; htim1.Init.Period = 999; htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1; htim1.Init.RepetitionCounter = 0; htim1.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE; if (HAL_TIM_Base_Init(&htim1) != HAL_OK) { Error_Handler(); } sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL; if (HAL_TIM_ConfigClockSource(&htim1, &sClockSourceConfig) != HAL_OK) { Error_Handler(); } if (HAL_TIM_PWM_Init(&htim1) != HAL_OK) { Error_Handler(); } sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET; sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE; if (HAL_TIMEx_MasterConfigSynchronization(&htim1, &sMasterConfig) != HAL_OK) { Error_Handler(); } sConfigOC.OCMode = TIM_OCMODE_PWM1; sConfigOC.Pulse = 99; sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH; sConfigOC.OCNPolarity = TIM_OCNPOLARITY_HIGH; sConfigOC.OCFastMode = TIM_OCFAST_DISABLE; sConfigOC.OCIdleState = TIM_OCIDLESTATE_RESET; sConfigOC.OCNIdleState = TIM_OCNIDLESTATE_RESET; if (HAL_TIM_PWM_ConfigChannel(&htim1, &sConfigOC, TIM_CHANNEL_1) != HAL_OK) { Error_Handler(); } sConfigOC.Pulse = 199; if (HAL_TIM_PWM_ConfigChannel(&htim1, &sConfigOC, TIM_CHANNEL_2) != HAL_OK) { Error_Handler(); } sBreakDeadTimeConfig.OffStateRunMode = TIM_OSSR_ENABLE; sBreakDeadTimeConfig.OffStateIDLEMode = TIM_OSSI_ENABLE; sBreakDeadTimeConfig.LockLevel = TIM_LOCKLEVEL_OFF; sBreakDeadTimeConfig.DeadTime = 50; sBreakDeadTimeConfig.BreakState = TIM_BREAK_ENABLE; sBreakDeadTimeConfig.BreakPolarity = TIM_BREAKPOLARITY_HIGH; sBreakDeadTimeConfig.AutomaticOutput = TIM_AUTOMATICOUTPUT_ENABLE; if (HAL_TIMEx_ConfigBreakDeadTime(&htim1, &sBreakDeadTimeConfig) != HAL_OK) { Error_Handler(); } HAL_TIM_MspPostInit(&htim1); }
sBreakDeadTimeConfig.DeadTime = 50;這句就是死區時間了,怎麼算,參考STM32F4xx中文參考手冊.pdf
DeadTime 是直接寫入DTG[7:0],顯然,當DeadTime <128時,最高位都是0,按照最上面的那條公式算就行了,DT=50Tdtg,其中,Tdtg=tDTS=1/164Mhz(tim1接在高速時鐘APB2),算出來就是DT=501/164M=0.3048us了
圖片
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