Posted on December 27, 2015 at 08:54
Hello,
Unable to enable PWM on PB.6 using TIM16 (TIM16_CH1N) for STM32F0 STM32F030x
(File also attached)
1. Table DocID024849 Rev 2 (STM32F030x) shows AF2 column TIM16_CH1N functionality;
2. ''Normal'' methods for enabling PWM on TIM16_CH1N do not seem to work. (I'm sure I have some funky error in the code, please help.)
3. I want to enable a 50/50 PWM; I expect to measure 3.3v/2 on PB6.
4. I've tried a bunch of different scenarios to try to enable the pin. Code is below and attahed.
5. Please advise any suggestions to fix.
6. Question: what is good ST document to refer to to better understand the TIM16_CH1N functionality?
7. Is it correct to ASSUME that the N in TIM16_CH1N is NEGATIVE polarity ??? (If not what does N mean?)
Thanks in advance,
-Chris
=====
/****************************************************/<
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>/****************************************************/<
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>void TIM16_RCC_Configuration(void)<
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>{<
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> RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);<
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> RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM16, ENABLE);<
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>}<
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><
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>/****************************************************/<
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>/****************************************************/<
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>void TIM16_GPIO_Configuration(void)<
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>{<
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> GPIO_InitTypeDef GPIO_InitStructure;<
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><
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> // PB.06 TIM16_CH1N<
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> GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;<
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> GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;<
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> GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;<
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> GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;<
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> GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;<
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> GPIO_Init(GPIOB, &GPIO_InitStructure);<
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><
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> GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_2);<
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><
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>}<
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><
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>/****************************************************/<
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>/****************************************************/<
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>void TIM16_Configuration(void)<
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>{<
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> TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;<
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> TIM_OCInitTypeDef TIM_OCInitStructure;<
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> NVIC_InitTypeDef NVIC_InitStructure;<
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><
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> // Set up TIM4_CH4 to be a 1 Hz time base (1PPS)<
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> TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);<
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><
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> TIM_TimeBaseStructure.TIM_Prescaler = 24000 - 1; // 24 MHz / 24000 = 1 KHz<
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> TIM_TimeBaseStructure.TIM_Period = 1000 - 1; // 1 KHz / 1000 = 1 Hz<
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> TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;<
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> TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;<
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> TIM_TimeBaseInit(TIM16, &TIM_TimeBaseStructure);<
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><
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> // Channel 4 configuration = PB.09 TIM4_CH4<
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> TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;<
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> //TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;<
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> //TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;<
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> TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;<
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> TIM_OCInitStructure.TIM_Pulse = (TIM_TimeBaseStructure.TIM_Period + 1) / 2; // 50% Duty<
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> TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;<
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><
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> //TIM_OC4Init(TIM16, &TIM_OCInitStructure);<
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> TIM_OC1Init(TIM16, &TIM_OCInitStructure);<
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> // turning on TIM4 and PWM outputs<
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> TIM_Cmd(TIM16, ENABLE);<
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> TIM_CtrlPWMOutputs(TIM16, ENABLE);<
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><
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> //NVIC_InitStructure.NVIC_IRQChannel = TIM16_IRQn;<
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> //NVIC_InitStructure.NVIC_IRQChannelPriority = 0x01;<
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> //NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;<
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> //NVIC_Init(&NVIC_InitStructure);<
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><
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><
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> //TIM_GenerateEvent(TIM16, TIM_EventSource_Update);<
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>}<
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><
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>/****************************************************/<
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>/****************************************************/<
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>void TIM16_InitializePWMChannel(void)<
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>{<
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> int i,j;<
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><
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> TIM16_RCC_Configuration();<
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><
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> TIM16_GPIO_Configuration();<
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><
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> TIM16_Configuration(); // 1Hz Output<
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><
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>}<
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>
#tim16-tim16_ch1n-pwm-stm32f030x
