Hi Everybody
I`m writing code for TM4C123GH6PM microcontroller
I`m using ADC0 sequence 2 to send values from channel 2 to digital comparator and sequence 3 to workout values from channel 1.
My problem is that somehow sequqnce 3 triggers digital comparator interrupt.
Part of code:
/*=================================================================================================*/
void ADC0_init(void)
{
/*-------------------------------------------------------------------------------------------------*/
SYSCTL_RCGC0_R |= SYSCTL_RCGC0_ADC0 | SYSCTL_RCGC0_ADC0SPD_1M;
SYSCTL_RCGC2_R |= SYSCTL_RCGC2_GPIOE;
/*-------------------------------------------------------------------------------------------------*/
GPIO_PORTE_DIR_R &=~(ADC0_CH1 | ADC0_CH2); //
GPIO_PORTE_AFSEL_R |= ADC0_CH1 | ADC0_CH2 ; //
GPIO_PORTE_DEN_R &=~(ADC0_CH1 | ADC0_CH2); //
GPIO_PORTE_AMSEL_R |= ADC0_CH1 | ADC0_CH2; //
/*-------------------------------------------------------------------------------------------------*/
ADC0_PC_R &=~ADC_PC_SR_M; // clear max sample rate field
ADC0_PC_R |= ADC_PC_SR_1M; // configure for 1M samples/sec
/*-------------------------------------------------------------------------------------------------*/
ADC0_SSPRI_R = 0x1320; // sequencer 3 is 2nd-highest priority, sequencer 2 is lowest priority
/*-------------------------------------------------------------------------------------------------*/
ADC0_ACTSS_R &=~(ADC_ACTSS_ASEN2 | ADC_ACTSS_ASEN3); // disable sample sequencer 2 & 3
/*-------------------------------------------------------------------------------------------------*/
ADC0_EMUX_R |= ADC_EMUX_EM2_ALWAYS | ADC_EMUX_EM3_TIMER; // SS2 is always trig; SS3 is timer trig
/*Sequence_2---------------------------------------------------------------------------------------*/
ADC0_SSOP2_R |= ADC_SSOP2_S0DCOP; // 1st sample of SS2 is sent to the
ADC0_SSDC2_R &=~ADC_SSDC2_S0DCSEL_M; // digital comparator unit 0
ADC0_SSMUX2_R |= 2 << ADC_SSMUX2_MUX0_S; // set 2nd channel for 1st sample of SS2
ADC0_SSCTL2_R |= ADC_SSCTL2_END1; // end of SS2 on 1st sample
/*DCU_0--------------------------------------------------------------------------------------------*/
ADC0_DCCTL0_R |= ADC_DCCTL0_CIC_HIGH | ADC_DCCTL0_CIM_HONCE; // Hysteresis Once mode in High Band
DCU0_setHighLevel(495); // set Comp1 level
/*Sequence_3---------------------------------------------------------------------------------------*/
ADC0_SSMUX3_R = 1 << ADC_SSMUX3_MUX0_S; // set 1st channel for 1st sample of SS3
ADC0_SSCTL3_R |= ADC_SSCTL3_IE0 + ADC_SSCTL3_END0; // interrupt and end of SS3 on first sample
/*-------------------------------------------------------------------------------------------------*/
ADC0_IM_R |= ADC_IM_DCONSS2 | ADC_IM_MASK3; // enable SS3 int and DComp int at SS2
/*-------------------------------------------------------------------------------------------------*/
ADC0_ACTSS_R |= ADC_ACTSS_ASEN2 | ADC_ACTSS_ASEN3; // enable sample sequencer 2 & 3
/*NVIC---------------------------------------------------------------------------------------------*/
NVIC_PEND0_R |= (1 << 17) + (1 << 16); // confgure NVIC for ADC seq2(int#16) and seq3(int#17)
NVIC_EN0_R |= (1 << 17) + (1 << 16); //
/*-------------------------------------------------------------------------------------------------*/
}
/*=================================================================================================*/
/*================================================================================================*/
void DCU0_setHighLevel(word pi_level)
{
ADC0_DCCMP0_R = (pi_level << 16) & 0xFFF0000; //
}
/*=================================================================================================*/
void DCU0_toggleStatus(void)
{
ADC0_DCCTL0_R ^= ADC_DCCTL0_CIE;
}
/*=================================================================================================*/
void DCU0_reset(void)
{
ADC0_DCRIC_R |= ADC_DCRIC_DCINT0;
}
/*=================================================================================================*/
/*=================================================================================================*/
void ADC0s3_IntHandler(void)
{
if (ADC0_RIS_R & ADC_RIS_INR3)
{
ADC0_ISC_R |= ADC_ISC_IN3;
SS3_handler(ADC0_SSFIFO3_R);
}
}
/*=================================================================================================*/
void ADC0s2_IntHandler(void)
{
if (ADC0_RIS_R & ADC_RIS_INRDC)
{
ADC0_DCISC_R |= ADC_DCISC_DCINT0;
DComp_handler();
}
}
/*=================================================================================================*/
Any qualified advise or help will be appreciated.
