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ADC Trigger TIM8

Question asked by waytae on Apr 2, 2013
Latest reply on Apr 3, 2013 by waclawek.jan
Hi,

I create a TIM8 mode up and down  using this Instruction 

TIM_TimeBaseStructure.TIM_Period = 2000;
TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_CenterAligned3;
TIM_TimeBaseInit(TIM8, &TIM_TimeBaseStructure);

image.jpeg

Then I create a PWM signal using TIM8_CH1

TIM8->CCR1 = 1500 ; // PC6   Signal 1

I have another part of my program that read ADC value of 5 signal using DMA.

I want to trigger the reading of ADC 4 time in period (The red circled in figure)

Ie when TIM8 = 0 , TIM8 = 1500 Up,  TIM8 = 1500 Down,  TIM8 = 2000, ...

I use this line in ADC  configuration

ADC_InitStructure.ADC_ScanConvMode = ENABLE;
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_RisingFalling;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T8_CC1;

But i don't know what this 2 line do exactly :-/
And how to verify if The trigger works in the desired Time or no ?

Can someone help me to read ADC in this 4 time

Thanks :)

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