Posted on March 21, 2017 at 04:48Hi,
I am doing a work with stm32f103 adc.The adc is triggered by tim8,and it works,but it cause a triangular wave on input.
what's wrong ?
The input pin is PA1,code is as below:
/* ADC1 init function */
void MX_ADC1_Init(void)
{
ADC_ChannelConfTypeDef sConfig;
/**Common config
*/
hadc1.Instance = ADC1;
hadc1.Init.ScanConvMode = ADC_SCAN_DISABLE;
hadc1.Init.ContinuousConvMode = DISABLE;
hadc1.Init.DiscontinuousConvMode = DISABLE;
hadc1.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T8_TRGO;
hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc1.Init.NbrOfConversion = 1;
HAL_ADC_Init(&hadc1);
/**Enable or disable the remapping of ADC1_ETRGREG:
* ADC1 External Event regular conversion is connected to TIM8 TRG0
*/
__HAL_AFIO_REMAP_ADC1_ETRGREG_ENABLE();
/**Configure Regular Channel
*/
sConfig.Channel = ADC_CHANNEL_1;
sConfig.Rank = 1;
sConfig.SamplingTime = ADC_SAMPLETIME_1CYCLE_5;
HAL_ADC_ConfigChannel(&hadc1, &sConfig);
}
void MX_TIM8_Init(void)
{
TIM_ClockConfigTypeDef sClockSourceConfig;
// TIM_SlaveConfigTypeDef sSlaveConfig;
TIM_MasterConfigTypeDef sMasterConfig;
htim8.Instance = TIM8;
htim8.Init.Prescaler = 20;
htim8.Init.CounterMode = TIM_COUNTERMODE_UP;
htim8.Init.Period = 140;
htim8.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim8.Init.RepetitionCounter = 0;
HAL_TIM_Base_Init(&htim8);
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
HAL_TIM_ConfigClockSource(&htim8, &sClockSourceConfig);
/*
sSlaveConfig.SlaveMode = TIM_SLAVEMODE_DISABLE;
sSlaveConfig.InputTrigger = TIM_TS_ITR0;
HAL_TIM_SlaveConfigSynchronization(&htim8, &sSlaveConfig);
*/
sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_ENABLE;
HAL_TIMEx_MasterConfigSynchronization(&htim8, &sMasterConfig);
}
main()
{
.......
MX_ADC1_Init();
MX_TIM8_Init();
HAL_ADC_Start_IT(&hadc1);
HAL_TIM_Base_Start(&htim8);
......
}
