F301 ADC injected conversion std peripheral lib commands

Posted on February 17, 2016 at 20:25

I've gotten software start to work now, by setting ADC_ExternalTrigEventEdge_None and calling ADC_StartInjectedConversion(ADC1). However, I'm not able to get timer1 CC4 to trigger the conversion. Timer1 is configured correctly since channels 1-3 are properly driving a motor.

  TIM_OCInitTypeDef  TIM_OCInitStructure;

  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;

  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;

  TIM_OCInitStructure.TIM_Pulse = 0;

  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

  TIM_OC4Init(TIM1, &TIM_OCInitStructure);

  // detect 10% into the PWM cycle

  TIM_SetCompare4(TIM1, (uint32_t)(0.1*TIM1->ARR));

  // GPIO setup for PB0...

  ADC_InjectedChannelSampleTimeConfig(ADC1, ADC_InjectedChannel_11, ADC_SampleTime_7Cycles5);

  ADC_InjectedDiscModeCmd(ADC1, ENABLE);

  ADC_InjectedInitTypeDef initStruct;

  ADC_InjectedStructInit(&initStruct);

  initStruct.ADC_ExternalTrigInjecConvEvent = ADC_ExternalTrigInjecConvEvent_1;

  initStruct.ADC_ExternalTrigInjecEventEdge = ADC_ExternalTrigInjecEventEdge_FallingEdge;

  initStruct.ADC_NbrOfInjecChannel = 1;

  initStruct.ADC_InjecSequence1 = ADC_InjectedChannel_11;

  ADC_InjectedInit(ADC1, &initStruct);

With the code above, ''ADC_GetFlagStatus(ADC1, ADC_FLAG_JEOC)'' never returns ''SET''. Additionally I got the injected conversion event 1 from the reference manual table 33 which says:

''JEXT1 | TIM1_CC4 event | Internal signal from on chip timers''

I'm not sure I am reading/implementing correctly but this was my best guess.

What am I doing wrong? Thanks for any help!

PS. I can't figure out how to format the code above, but hopefully it's small enough that everything is legible.

Posted on February 17, 2016 at 21:57

Format Code Block is ''Paintbrush [< >]''  Icon.

Not using an F301 here, but it does look like TIM1_CH4 should trigger here. You could output via a pin and confirm. CH4 doesn't have the N channel, but does require the TIM_OCIdleState setting. Fill or clear the whole structure.

Posted on February 18, 2016 at 18:31

Thanks clive1 for the answer. I output Tim1 Ch4 on PA11, and checked on a scope. It was outputting a 10% duty cycle wave at 19KHz, so that part seems OK.

I found some new info by reading the comments for

ADC_StartInjectedConversion

in the stm32f30x_adc.c file: ''Enable the selected ADC conversion for injected group on external event and start the selectedADC injected conversion''. So my new ADC-related code is now:

// 1. set JSQR
ADC_InjectedInitTypeDef initStruct;
ADC_InjectedStructInit(&initStruct);
initStruct.ADC_ExternalTrigInjecConvEvent = ADC_ExternalTrigInjecConvEvent_1;
// initStruct.ADC_ExternalTrigInjecEventEdge = ADC_ExternalTrigEventEdge_None;
initStruct.ADC_ExternalTrigInjecEventEdge = ADC_ExternalTrigInjecEventEdge_FallingEdge;
initStruct.ADC_NbrOfInjecChannel = 1;
initStruct.ADC_InjecSequence1 = ADC_InjectedChannel_11;
ADC_InjectedInit(ADC1, &initStruct);
// 3. set sample time
ADC_InjectedChannelSampleTimeConfig(ADC1, ADC_InjectedChannel_11, ADC_SampleTime_7Cycles5);
// 4. set JQM
ADC_SelectQueueOfContextMode(ADC1, DISABLE);
// 5. set JAUTO
ADC_AutoInjectedConvCmd(ADC1, DISABLE);
ADC_InjectedDiscModeCmd(ADC1, ENABLE);
// Hardware-injected conversion is started after the JADSTART bit is set, and at the next active edge of the selected injected hardware trigger.
ADC_StartInjectedConversion(ADC1);

CC4 setup code:

TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC4Init(TIM1, &TIM_OCInitStructure);
// detect 10% into the PWM cycle
TIM_SetCompare4(TIM1, (uint32_t)(0.1*TIM1->ARR));

However the conversion is still not triggered by the timer, and only by explicitly calling ''ADC_StartInjectedConversion''.Do I need to enable/handle any interrupts? I assumed that the conversions would happen triggered by the timer and I could read the converted value usingADC_GetInjectedConversionValue.