Part Number:MSP432P401R
Hello folks,
I am looking for a sanity check on my settings of the ADC for the MSP432. If someone could please confirm everything below looks correct (without any blatant bugs that could cause jumpy ADC readings) I would be very grateful. I call initialize_adcs() function at the beginning of the program once, prioritize ADC14_IRQHandler() ISR as shown below.
MAP_Interrupt_setPriority(FAULT_SYSTICK, 0x10);
MAP_Interrupt_setPriority(INT_PORT1, 0x20);
MAP_Interrupt_setPriority(INT_ADC14, 0x20);I then call the following once, prior to the main while() loop:
ADC14->CTL0 |= ADC14_CTL0_ENC | /*!< ADC14 enable conversion - same as MAP_ADC14_toggleConversionTrigger(); */ ADC14_CTL0_SC; /*!< ADC14 start conversion */
I am reading ADC 0-13 and pull the internal temperature sensor info which required some unclear modification... (which is mostly why I am concerned regarding the settings below)
void initialize_adcs(void)
{
// Initialize the shared reference module. By default, REFMSTR=1 => REFCTL is used to configure the internal reference
while(REF_A->CTL0 & REF_A_CTL0_GENBUSY);// If ref generator busy, WAIT
REF_A->CTL0 |= REF_A_CTL0_VSEL_0 | // Enable internal 1.2V reference
REF_A_CTL0_ON; // Turn reference on
REF_A->CTL0 |= REF_A_CTL0_ON; // Turn reference on
REF_A->CTL0 &= ~REF_A_CTL0_TCOFF; // Enable temperature sensor
// Turn on ADC14, extend sampling time to avoid overflow of results
ADC14->CTL0 = ADC14_CTL0_ON | /*!< ADC14 on */
ADC14_CTL0_MSC | /*!< ADC14 multiple sample and conversion */
ADC14_CTL0_SHT0__192 | /*!< 192 */
ADC14_CTL0_SHP | /*!< ADC14 sample-and-hold pulse-mode select */
ADC14_CTL0_CONSEQ_3; /*!< Repeat-sequence-of-channels */
ADC14->CTL1 |= ADC14_CTL1_TCMAP; // Enable internal temperature sensor
ADC14->MCTL[0] = ADC14_MCTLN_INCH_0; // ref+=AVcc, channel = A0
ADC14->MCTL[1] = ADC14_MCTLN_INCH_1; // ref+=AVcc, channel = A1
ADC14->MCTL[2] = ADC14_MCTLN_INCH_2; // ref+=AVcc, channel = A2
ADC14->MCTL[3] = ADC14_MCTLN_INCH_3; // ref+=AVcc, channel = A3
ADC14->MCTL[4] = ADC14_MCTLN_INCH_4; // ref+=AVcc, channel = A4
ADC14->MCTL[5] = ADC14_MCTLN_VRSEL_1 | ADC14_MCTLN_INCH_22; // ADC input ch A22 => temp sense
// ADC14->MCTL[5] = ADC14_MCTLN_INCH_5; // original code without temperature sensor
ADC14->MCTL[6] = ADC14_MCTLN_INCH_6; // ref+=AVcc, channel = A6
ADC14->MCTL[7] = ADC14_MCTLN_INCH_7; // ref+=AVcc, channel = A7
ADC14->MCTL[8] = ADC14_MCTLN_INCH_8; // ref+=AVcc, channel = A8
ADC14->MCTL[9] = ADC14_MCTLN_INCH_9; // ref+=AVcc, channel = A9
ADC14->MCTL[10] = ADC14_MCTLN_INCH_10; // ref+=AVcc, channel = A10
ADC14->MCTL[11] = ADC14_MCTLN_INCH_11; // ref+=AVcc, channel = A11
ADC14->MCTL[12] = ADC14_MCTLN_INCH_12; // ref+=AVcc, channel = A12
ADC14->MCTL[13] = ADC14_MCTLN_INCH_13| // ref+=AVcc, channel = A13
ADC14_MCTLN_EOS;
ADC14->IER0 = ADC14_IER0_IE13; // Enable ADC14IFG.7
while(!(REF_A->CTL0 & REF_A_CTL0_GENRDY)); // Wait for reference generator to settle
__enable_interrupt();
NVIC->ISER[0] = 1 << ((ADC14_IRQn) & 31); // Enable ADC interrupt in NVIC module
}
/* ADC14 interrupt service routine */
void ADC14_IRQHandler(void) {
if (ADC14->IFGR0 & ADC14_IFGR0_IFG13)
{
A0results[0] = ADC14->MEM[0];
y1_sim = A0results[0];
A0results[1] = ADC14->MEM[1];
A0results[2] = ADC14->MEM[2];
A0results[3] = ADC14->MEM[3];
y2_sim = A0results[3];
A0results[4] = ADC14->MEM[4];
A0results[5] = ADC14->MEM[5];
temp = A0results[5];
lift_off1[0] = ADC14->MEM[6];
lift_off1[1] = ADC14->MEM[7];
lift_off1[2] = ADC14->MEM[8];
lift_off2[0] = ADC14->MEM[9];
lift_off2[1] = ADC14->MEM[10];
lift_off2[2] = ADC14->MEM[11];
A0results[12] = ADC14->MEM[12];
A0results[13] = ADC14->MEM[13];
}
}
I am most concerned about ADC values jumping for no reason which could trigger unwanted effects in our system.
Thank you,
Bob
