Posted on November 22, 2011 at 16:17hello, I'm trying to trigger the ADC1 with the TRGO signal of TIM1, here is the code that I,m using to configure the timer:
TIM1_DeInit();
TIM1_TimeBaseInit(128, TIM1_CounterMode_Up, 62500, 0);
TIM1_SelectOutputTrigger(TIM1_TRGOSource_Update);
TIM1_Cmd(ENABLE);
while for configuring the ADC1 and getting the conversion result I'm using (adapted from STM8L-discovery firmware):
u16 ADC_CH3_TRIG(void)
{
uint8_t i;
uint16_t res;
/* Enable ADC clock */
CLK_PeripheralClockConfig(CLK_Peripheral_ADC1, ENABLE);
/* de-initialize ADC */
ADC_DeInit(ADC1);
/*ADC configuration
ADC configured as follow:
- Channel 3
- Mode = Single ConversionMode(ContinuousConvMode disabled)
- Resolution = 12Bit
- Prescaler = /1
- sampling time 9 */
ADC_Cmd(ADC1, ENABLE);
ADC_Init(ADC1, ADC_ConversionMode_Single,
ADC_Resolution_12Bit, ADC_Prescaler_1);
ADC_SamplingTimeConfig(ADC1, ADC_Group_FastChannels, ADC_SamplingTime_9Cycles);
ADC_ExternalTrigConfig(ADC1,
ADC_ExtEventSelection_Trigger2,
ADC_ExtTRGSensitivity_Rising);
ADC_ChannelCmd(ADC1, ADC_Channel_3, ENABLE);
delay_10us(3);
/* initialize result */
res = 0;
for(i=8; i>0; i--)
{
/* start ADC convertion by software */
//ADC_SoftwareStartConv(ADC1);
/* wait until end-of-covertion */
while( ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == 0 );
/* read ADC convertion result */
res += ADC_GetConversionValue(ADC1);
}
/* de-initialize ADC */
//ADC_VrefintCmd(DISABLE);
ADC_DeInit(ADC1);
/* disable SchmittTrigger for ADC_Channel_24, to save power */
//ADC_SchmittTriggerConfig(ADC1, ADC_Channel_24, DISABLE);
CLK_PeripheralClockConfig(CLK_Peripheral_ADC1, DISABLE);
ADC_ChannelCmd(ADC1, ADC_Channel_3, DISABLE);
return (res>>3);
}
The program seems to hang up at the while loop waiting for EOC signal... what am I doing wrong? Is there an application note that I can use for ADC triggering with a timer?
#adc-stm8
