ADC Module¶

The analog to digital converter (ADC) API provides a set of functions for programming the digital circuits of the converter, referred to as the ADC wrapper. Functions are provided to configure the conversions, read the data conversion result registers, configure the post-processing blocks (PPB), and set up and handle interrupts and events.

group adc_api

Defines

ADC_NUM_INTERRUPTS 4U¶

ADC_SOCxCTL_OFFSET_BASE ADC_O_SOC0CTL¶

ADC_RESULTx_OFFSET_BASE ADC_O_RESULT0¶

ADC_INTSELxNy_OFFSET_BASE ADC_O_INTSEL1N2¶

ADC_PPBxRESULT_OFFSET_BASE ADC_O_PPB1RESULT¶

ADC_PPBxCONFIG_STEP (ADC_O_PPB2CONFIG - ADC_O_PPB1CONFIG)¶

ADC_PPBxTRIPHI_STEP (ADC_O_PPB2TRIPHI - ADC_O_PPB1TRIPHI)¶

ADC_PPBxTRIPLO_STEP (ADC_O_PPB2TRIPLO - ADC_O_PPB1TRIPLO)¶

ADC_PPBxSTAMP_STEP (ADC_O_PPB2STAMP - ADC_O_PPB1STAMP)¶

ADC_PPBxOFFCAL_STEP (ADC_O_PPB2OFFCAL - ADC_O_PPB1OFFCAL)¶

ADC_PPBxOFFREF_STEP (ADC_O_PPB2OFFREF - ADC_O_PPB1OFFREF)¶

ADC_PPBTRIP_MASK ((uint32_t)ADC_PPB1TRIPHI_LIMITHI_M | \ (uint32_t) ADC_PPB1TRIPHI_HSIGN)¶

ADC_getTempSlope() (*(int16_t (*)(void))0x7036E)()¶

ADC_getTempOffset() (*(int16_t (*)(void))0x70372)()¶

ADC_EVT_TRIPHI 0x0001U¶: Trip High Event.

ADC_EVT_TRIPLO 0x0002U¶: Trip Low Event.

ADC_EVT_ZERO 0x0004U¶: Zero Crossing Event.

ADC_FORCE_SOC0 0x0001U¶: SW trigger ADC SOC 0.

ADC_FORCE_SOC1 0x0002U¶: SW trigger ADC SOC 1.

ADC_FORCE_SOC2 0x0004U¶: SW trigger ADC SOC 2.

ADC_FORCE_SOC3 0x0008U¶: SW trigger ADC SOC 3.

ADC_FORCE_SOC4 0x0010U¶: SW trigger ADC SOC 4.

ADC_FORCE_SOC5 0x0020U¶: SW trigger ADC SOC 5.

ADC_FORCE_SOC6 0x0040U¶: SW trigger ADC SOC 6.

ADC_FORCE_SOC7 0x0080U¶: SW trigger ADC SOC 7.

ADC_FORCE_SOC8 0x0100U¶: SW trigger ADC SOC 8.

ADC_FORCE_SOC9 0x0200U¶: SW trigger ADC SOC 9.

ADC_FORCE_SOC10 0x0400U¶: SW trigger ADC SOC 10.

ADC_FORCE_SOC11 0x0800U¶: SW trigger ADC SOC 11.

ADC_FORCE_SOC12 0x1000U¶: SW trigger ADC SOC 12.

ADC_FORCE_SOC13 0x2000U¶: SW trigger ADC SOC 13.

ADC_FORCE_SOC14 0x4000U¶: SW trigger ADC SOC 14.

ADC_FORCE_SOC15 0x8000U¶: SW trigger ADC SOC 15.

Enums

enum ADC_ClkPrescale¶

Values that can be passed to ADC_setPrescaler() as the clkPrescale parameter.

Values:

enumerator ADC_CLK_DIV_1_0 = 0¶: ADCCLK = (input clock) / 1.0.

enumerator ADC_CLK_DIV_2_0 = 2¶: ADCCLK = (input clock) / 2.0.

enumerator ADC_CLK_DIV_2_5 = 3¶: ADCCLK = (input clock) / 2.5.

enumerator ADC_CLK_DIV_3_0 = 4¶: ADCCLK = (input clock) / 3.0.

enumerator ADC_CLK_DIV_3_5 = 5¶: ADCCLK = (input clock) / 3.5.

enumerator ADC_CLK_DIV_4_0 = 6¶: ADCCLK = (input clock) / 4.0.

enumerator ADC_CLK_DIV_4_5 = 7¶: ADCCLK = (input clock) / 4.5.

enumerator ADC_CLK_DIV_5_0 = 8¶: ADCCLK = (input clock) / 5.0.

enumerator ADC_CLK_DIV_5_5 = 9¶: ADCCLK = (input clock) / 5.5.

enumerator ADC_CLK_DIV_6_0 = 10¶: ADCCLK = (input clock) / 6.0.

enumerator ADC_CLK_DIV_6_5 = 11¶: ADCCLK = (input clock) / 6.5.

enumerator ADC_CLK_DIV_7_0 = 12¶: ADCCLK = (input clock) / 7.0.

enumerator ADC_CLK_DIV_7_5 = 13¶: ADCCLK = (input clock) / 7.5.

enumerator ADC_CLK_DIV_8_0 = 14¶: ADCCLK = (input clock) / 8.0.

enumerator ADC_CLK_DIV_8_5 = 15¶: ADCCLK = (input clock) / 8.5.

enum ADC_Resolution¶

Values that can be passed to ADC_setMode() as the resolution parameter.

Values:

enumerator ADC_RESOLUTION_12BIT = 0x00¶: 12-bit conversion resolution

enumerator ADC_RESOLUTION_16BIT = 0x40¶: 16-bit conversion resolution

enum ADC_SignalMode¶

Values that can be passed to ADC_setMode() as the signalMode parameter.

Values:

enumerator ADC_MODE_SINGLE_ENDED = 0x00¶: Sample on single pin with VREFLO.

enumerator ADC_MODE_DIFFERENTIAL = 0x80¶: Sample on pair of pins.

enum ADC_Trigger¶

Values that can be passed to ADC_setupSOC() as the trigger parameter to specify the event that will trigger a conversion to start. It is also used with ADC_setBurstModeConfig().

Values:

enumerator ADC_TRIGGER_SW_ONLY = 0¶: Software only.

enumerator ADC_TRIGGER_CPU1_TINT0 = 1¶: CPU1 Timer 0, TINT0.

enumerator ADC_TRIGGER_CPU1_TINT1 = 2¶: CPU1 Timer 1, TINT1.

enumerator ADC_TRIGGER_CPU1_TINT2 = 3¶: CPU1 Timer 2, TINT2.

enumerator ADC_TRIGGER_GPIO = 4¶: GPIO, ADCEXTSOC.

enumerator ADC_TRIGGER_EPWM1_SOCA = 5¶: ePWM1, ADCSOCA

enumerator ADC_TRIGGER_EPWM1_SOCB = 6¶: ePWM1, ADCSOCB

enumerator ADC_TRIGGER_EPWM2_SOCA = 7¶: ePWM2, ADCSOCA

enumerator ADC_TRIGGER_EPWM2_SOCB = 8¶: ePWM2, ADCSOCB

enumerator ADC_TRIGGER_EPWM3_SOCA = 9¶: ePWM3, ADCSOCA

enumerator ADC_TRIGGER_EPWM3_SOCB = 10¶: ePWM3, ADCSOCB

enumerator ADC_TRIGGER_EPWM4_SOCA = 11¶: ePWM4, ADCSOCA

enumerator ADC_TRIGGER_EPWM4_SOCB = 12¶: ePWM4, ADCSOCB

enumerator ADC_TRIGGER_EPWM5_SOCA = 13¶: ePWM5, ADCSOCA

enumerator ADC_TRIGGER_EPWM5_SOCB = 14¶: ePWM5, ADCSOCB

enumerator ADC_TRIGGER_EPWM6_SOCA = 15¶: ePWM6, ADCSOCA

enumerator ADC_TRIGGER_EPWM6_SOCB = 16¶: ePWM6, ADCSOCB

enumerator ADC_TRIGGER_EPWM7_SOCA = 17¶: ePWM7, ADCSOCA

enumerator ADC_TRIGGER_EPWM7_SOCB = 18¶: ePWM7, ADCSOCB

enumerator ADC_TRIGGER_EPWM8_SOCA = 19¶: ePWM8, ADCSOCA

enumerator ADC_TRIGGER_EPWM8_SOCB = 20¶: ePWM8, ADCSOCB

enumerator ADC_TRIGGER_EPWM9_SOCA = 21¶: ePWM9, ADCSOCA

enumerator ADC_TRIGGER_EPWM9_SOCB = 22¶: ePWM9, ADCSOCB

enumerator ADC_TRIGGER_EPWM10_SOCA = 23¶: ePWM10, ADCSOCA

enumerator ADC_TRIGGER_EPWM10_SOCB = 24¶: ePWM10, ADCSOCB

enumerator ADC_TRIGGER_EPWM11_SOCA = 25¶: ePWM11, ADCSOCA

enumerator ADC_TRIGGER_EPWM11_SOCB = 26¶: ePWM11, ADCSOCB

enumerator ADC_TRIGGER_EPWM12_SOCA = 27¶: ePWM12, ADCSOCA

enumerator ADC_TRIGGER_EPWM12_SOCB = 28¶: ePWM12, ADCSOCB

enum ADC_Channel¶

Values that can be passed to ADC_setupSOC() as the channel parameter. This is the input pin on which the signal to be converted is located.

Values:

enumerator ADC_CH_ADCIN0 = 0¶: single-ended, ADCIN0

enumerator ADC_CH_ADCIN1 = 1¶: single-ended, ADCIN1

enumerator ADC_CH_ADCIN2 = 2¶: single-ended, ADCIN2

enumerator ADC_CH_ADCIN3 = 3¶: single-ended, ADCIN3

enumerator ADC_CH_ADCIN4 = 4¶: single-ended, ADCIN4

enumerator ADC_CH_ADCIN5 = 5¶: single-ended, ADCIN5

enumerator ADC_CH_ADCIN6 = 6¶: single-ended, ADCIN6

enumerator ADC_CH_ADCIN7 = 7¶: single-ended, ADCIN7

enumerator ADC_CH_ADCIN8 = 8¶: single-ended, ADCIN8

enumerator ADC_CH_ADCIN9 = 9¶: single-ended, ADCIN9

enumerator ADC_CH_ADCIN10 = 10¶: single-ended, ADCIN10

enumerator ADC_CH_ADCIN11 = 11¶: single-ended, ADCIN11

enumerator ADC_CH_ADCIN12 = 12¶: single-ended, ADCIN12

enumerator ADC_CH_ADCIN13 = 13¶: single-ended, ADCIN13

enumerator ADC_CH_ADCIN14 = 14¶: single-ended, ADCIN14

enumerator ADC_CH_ADCIN15 = 15¶: single-ended, ADCIN15

enumerator ADC_CH_ADCIN0_ADCIN1 = 0¶: differential, ADCIN0 and ADCIN1

enumerator ADC_CH_ADCIN2_ADCIN3 = 2¶: differential, ADCIN2 and ADCIN3

enumerator ADC_CH_ADCIN4_ADCIN5 = 4¶: differential, ADCIN4 and ADCIN5

enumerator ADC_CH_ADCIN6_ADCIN7 = 6¶: differential, ADCIN6 and ADCIN7

enumerator ADC_CH_ADCIN8_ADCIN9 = 8¶: differential, ADCIN8 and ADCIN9

enumerator ADC_CH_ADCIN10_ADCIN11 = 10¶: differential, ADCIN10 and ADCIN11

enumerator ADC_CH_ADCIN12_ADCIN13 = 12¶: differential, ADCIN12 and ADCIN13

enumerator ADC_CH_ADCIN14_ADCIN15 = 14¶: differential, ADCIN14 and ADCIN15

enum ADC_PulseMode¶

Values that can be passed to ADC_setInterruptPulseMode() as the pulseMode parameter.

Values:

enumerator ADC_PULSE_END_OF_ACQ_WIN = 0x00¶: Occurs at the end of the acquisition window.

enumerator ADC_PULSE_END_OF_CONV = 0x04¶: Occurs at the end of the conversion.

enum ADC_IntNumber¶

Values that can be passed to ADC_enableInterrupt(), ADC_disableInterrupt(), and ADC_getInterruptStatus() as the adcIntNum parameter.

Values:

enumerator ADC_INT_NUMBER1¶: ADCINT1 Interrupt.

enumerator ADC_INT_NUMBER2¶: ADCINT2 Interrupt.

enumerator ADC_INT_NUMBER3¶: ADCINT3 Interrupt.

enumerator ADC_INT_NUMBER4¶: ADCINT4 Interrupt.

enum ADC_PPBNumber¶

Values that can be passed in as the ppbNumber parameter for several functions.

Values:

enumerator ADC_PPB_NUMBER1¶: Post-processing block 1.

enumerator ADC_PPB_NUMBER2¶: Post-processing block 2.

enumerator ADC_PPB_NUMBER3¶: Post-processing block 3.

enumerator ADC_PPB_NUMBER4¶: Post-processing block 4.

enum ADC_SOCNumber¶

Values that can be passed in as the socNumber parameter for several functions. This value identifies the start-of-conversion (SOC) that a function is configuring or accessing. Note that in some cases (for example, ADC_setInterruptSource()) socNumber is used to refer to the corresponding end-of-conversion (EOC).

Values:

enumerator ADC_SOC_NUMBER0¶: SOC/EOC number 0.

enumerator ADC_SOC_NUMBER1¶: SOC/EOC number 1.

enumerator ADC_SOC_NUMBER2¶: SOC/EOC number 2.

enumerator ADC_SOC_NUMBER3¶: SOC/EOC number 3.

enumerator ADC_SOC_NUMBER4¶: SOC/EOC number 4.

enumerator ADC_SOC_NUMBER5¶: SOC/EOC number 5.

enumerator ADC_SOC_NUMBER6¶: SOC/EOC number 6.

enumerator ADC_SOC_NUMBER7¶: SOC/EOC number 7.

enumerator ADC_SOC_NUMBER8¶: SOC/EOC number 8.

enumerator ADC_SOC_NUMBER9¶: SOC/EOC number 9.

enumerator ADC_SOC_NUMBER10¶: SOC/EOC number 10.

enumerator ADC_SOC_NUMBER11¶: SOC/EOC number 11.

enumerator ADC_SOC_NUMBER12¶: SOC/EOC number 12.

enumerator ADC_SOC_NUMBER13¶: SOC/EOC number 13.

enumerator ADC_SOC_NUMBER14¶: SOC/EOC number 14.

enumerator ADC_SOC_NUMBER15¶: SOC/EOC number 15.

enum ADC_IntSOCTrigger¶

Values that can be passed in as the trigger parameter for the ADC_setInterruptSOCTrigger() function.

Values:

enumerator ADC_INT_SOC_TRIGGER_NONE¶: No ADCINT will trigger the SOC.

enumerator ADC_INT_SOC_TRIGGER_ADCINT1¶: ADCINT1 will trigger the SOC.

enumerator ADC_INT_SOC_TRIGGER_ADCINT2¶: ADCINT2 will trigger the SOC.

enum ADC_PriorityMode¶

Values that can be passed to ADC_setSOCPriority() as the priMode parameter.

Values:

enumerator ADC_PRI_ALL_ROUND_ROBIN¶: Round robin mode is used for all.

enumerator ADC_PRI_SOC0_HIPRI¶: SOC 0 hi pri, others in round robin.

enumerator ADC_PRI_THRU_SOC1_HIPRI¶: SOC 0-1 hi pri, others in round robin.

enumerator ADC_PRI_THRU_SOC2_HIPRI¶: SOC 0-2 hi pri, others in round robin.

enumerator ADC_PRI_THRU_SOC3_HIPRI¶: SOC 0-3 hi pri, others in round robin.

enumerator ADC_PRI_THRU_SOC4_HIPRI¶: SOC 0-4 hi pri, others in round robin.

enumerator ADC_PRI_THRU_SOC5_HIPRI¶: SOC 0-5 hi pri, others in round robin.

enumerator ADC_PRI_THRU_SOC6_HIPRI¶: SOC 0-6 hi pri, others in round robin.

enumerator ADC_PRI_THRU_SOC7_HIPRI¶: SOC 0-7 hi pri, others in round robin.

enumerator ADC_PRI_THRU_SOC8_HIPRI¶: SOC 0-8 hi pri, others in round robin.

enumerator ADC_PRI_THRU_SOC9_HIPRI¶: SOC 0-9 hi pri, others in round robin.

enumerator ADC_PRI_THRU_SOC10_HIPRI¶: SOC 0-10 hi pri, others in round robin.

enumerator ADC_PRI_THRU_SOC11_HIPRI¶: SOC 0-11 hi pri, others in round robin.

enumerator ADC_PRI_THRU_SOC12_HIPRI¶: SOC 0-12 hi pri, others in round robin.

enumerator ADC_PRI_THRU_SOC13_HIPRI¶: SOC 0-13 hi pri, others in round robin.

enumerator ADC_PRI_THRU_SOC14_HIPRI¶: SOC 0-14 hi pri, SOC15 in round robin.

enumerator ADC_PRI_ALL_HIPRI¶: All priorities based on SOC number.

enum ADC_OSDetectMode¶

Values that can be passed to ADC_configOSDetectMode() as the modeVal parameter.

Values:

enumerator ADC_OSDETECT_MODE_DISABLED = 0x0¶: Open/Shorts detection cir- cuit(O/S DC) is disabled

enumerator ADC_OSDETECT_MODE_VSSA = 0x1¶: O/S DC is enabled at zero scale

enumerator ADC_OSDETECT_MODE_VDDA = 0x2¶: O/S DC is enabled at full scale

enumerator ADC_OSDETECT_MODE_5BY12_VDDA = 0x3¶: O/S DC is enabled at 5/12 scale

enumerator ADC_OSDETECT_MODE_7BY12_VDDA = 0x4¶: O/S DC is enabled at 7/12 scale

enumerator ADC_OSDETECT_MODE_5K_PULLDOWN_TO_VSSA = 0x5¶: O/S DC is enabled at 5K pulldown to VSSA

enumerator ADC_OSDETECT_MODE_5K_PULLUP_TO_VDDA = 0x6¶: O/S DC is enabled at 5K pullup to VDDA

enumerator ADC_OSDETECT_MODE_7K_PULLDOWN_TO_VSSA = 0x7¶: O/S DC is enabled at 7K pulldown to VSSA

Functions

void ADC_setPrescaler(uint32_t base, ADC_ClkPrescale clkPrescale)¶

Configures the analog-to-digital converter module prescaler.

This function configures the ADC module’s ADCCLK.

Parameters

base: is the base address of the ADC module.
clkPrescale: is the ADC clock prescaler.

The clkPrescale parameter specifies the value by which the input clock is divided to make the ADCCLK. The clkPrescale value can be specified with any of the following enum values: ADC_CLK_DIV_1_0, ADC_CLK_DIV_2_0, ADC_CLK_DIV_2_5, …, ADC_CLK_DIV_7_5, ADC_CLK_DIV_8_0, or ADC_CLK_DIV_8_5.

Return: None.

void ADC_setupSOC(uint32_t base, ADC_SOCNumber socNumber, ADC_Trigger trigger, ADC_Channel channel, uint32_t sampleWindow)¶

Configures a start-of-conversion (SOC) in the ADC.

This function configures the a start-of-conversion (SOC) in the ADC module.

Parameters

base: is the base address of the ADC module.
socNumber: is the number of the start-of-conversion.
trigger: the source that will cause the SOC.
channel: is the number associated with the input signal.
sampleWindow: is the acquisition window duration.

The socNumber number is a value ADC_SOC_NUMBERX where X is a number from 0 to 15 specifying which SOC is to be configured on the ADC module specified by base.

The trigger specifies the event that causes the SOC such as software, a timer interrupt, an ePWM event, or an ADC interrupt. It should be a value in the format of ADC_TRIGGER_XXXX where XXXX is the event such as ADC_TRIGGER_SW_ONLY, ADC_TRIGGER_CPU1_TINT0, ADC_TRIGGER_GPIO, ADC_TRIGGER_EPWM1_SOCA, and so on.

The channel parameter specifies the channel to be converted. In single-ended mode this is a single pin given by ADC_CH_ADCINx where x is the number identifying the pin between 0 and 15 inclusive. In differential mode, two pins are used as inputs and are passed in the channel parameter as ADC_CH_ADCIN0_ADCIN1, ADC_CH_ADCIN2_ADCIN3, …, or ADC_CH_ADCIN14_ADCIN15.

The sampleWindow parameter is the acquisition window duration in SYSCLK cycles. It should be a value between 1 and 512 cycles inclusive. The selected duration must be at least as long as one ADCCLK cycle. Also, the datasheet will specify a minimum window duration requirement in nanoseconds.

Return: None.

void ADC_setInterruptSOCTrigger(uint32_t base, ADC_SOCNumber socNumber, ADC_IntSOCTrigger trigger)¶

Configures the interrupt SOC trigger of an SOC.

This function configures the interrupt start-of-conversion trigger in the ADC module.

Parameters

base: is the base address of the ADC module.
socNumber: is the number of the start-of-conversion.
trigger: the interrupt source that will cause the SOC.

The socNumber number is a value ADC_SOC_NUMBERX where X is a number from 0 to 15 specifying which SOC is to be configured on the ADC module specified by base.

The trigger specifies the interrupt that causes a start of conversion or none. It should be one of the following values.

ADC_INT_SOC_TRIGGER_NONE
ADC_INT_SOC_TRIGGER_ADCINT1
ADC_INT_SOC_TRIGGER_ADCINT2

This functionality is useful for creating continuous conversions.

Return: None.

void ADC_setInterruptPulseMode(uint32_t base, ADC_PulseMode pulseMode)¶

Sets the timing of the end-of-conversion pulse

This function configures the end-of-conversion (EOC) pulse generated by ADC. This pulse will be generated either at the end of the acquisition window (pass

ADC_PULSE_END_OF_ACQ_WIN into pulseMode) or at the end of the voltage conversion, one cycle prior to the ADC result latching into it’s result register (pass ADC_PULSE_END_OF_CONV into pulseMode).

Parameters

base: is the base address of the ADC module.
pulseMode: is the generation mode of the EOC pulse.

Return: None.

void ADC_enableConverter(uint32_t base)¶

Powers up the analog-to-digital converter core.

This function powers up the analog circuitry inside the analog core.

Parameters

base: is the base address of the ADC module.

Note: Allow at least a 500us delay before sampling after calling this API. If you enable multiple ADCs, you can delay after they all have begun powering up.
Return: None.

void ADC_disableConverter(uint32_t base)¶

Powers down the analog-to-digital converter module.

This function powers down the analog circuitry inside the analog core.

Parameters

base: is the base address of the ADC module.

Return: None.

void ADC_forceSOC(uint32_t base, ADC_SOCNumber socNumber)¶

Forces a SOC flag to a 1 in the analog-to-digital converter.

This function forces the SOC flag associated with the SOC specified by

socNumber. This initiates a conversion once that SOC is given priority. This software trigger can be used whether or not the SOC has been configured to accept some other specific trigger.

Parameters

base: is the base address of the ADC module.
socNumber: is the number of the start-of-conversion.

Return: None.

void ADC_forceMultipleSOC(uint32_t base, uint16_t socMask)¶

Forces multiple SOC flags to 1 in the analog-to-digital converter.

This function forces the SOCFRC1 flags associated with the SOCs specified by

socMask. This initiates a conversion once the desired SOCs are given priority. This software trigger can be used whether or not the SOC has been configured to accept some other specific trigger. Valid values for socMask parameter can be any of the individual ADC_FORCE_SOCx values or any of their OR’d combination to trigger multiple SOCs.

Parameters

base: is the base address of the ADC module.
socMask: is the SOCs to be forced through software

Note: To trigger SOC0, SOC1 and SOC2, value (ADC_FORCE_SOC0 | ADC_FORCE_SOC1 | ADC_FORCE_SOC2) should be passed as socMask.
Return: None.

bool ADC_getInterruptStatus(uint32_t base, ADC_IntNumber adcIntNum)¶

Gets the current ADC interrupt status.

This function returns the interrupt status for the analog-to-digital converter.

Parameters

base: is the base address of the ADC module.
adcIntNum: is interrupt number within the ADC wrapper.

adcIntNum takes a one of the values ADC_INT_NUMBER1, ADC_INT_NUMBER2, ADC_INT_NUMBER3, or ADC_INT_NUMBER4 to express which of the four interrupts of the ADC module should be cleared.

Return: true if the interrupt flag for the specified interrupt number is set and false if it is not.

void ADC_clearInterruptStatus(uint32_t base, ADC_IntNumber adcIntNum)¶

Clears ADC interrupt sources.

This function clears the specified ADC interrupt sources so that they no longer assert. If not in continuous mode, this function must be called before any further interrupt pulses may occur.

Parameters

base: is the base address of the ADC module.
adcIntNum: is interrupt number within the ADC wrapper.

adcIntNum takes a one of the values ADC_INT_NUMBER1, ADC_INT_NUMBER2, ADC_INT_NUMBER3, or ADC_INT_NUMBER4 to express which of the four interrupts of the ADC module should be cleared.

Return: None.

bool ADC_getInterruptOverflowStatus(uint32_t base, ADC_IntNumber adcIntNum)¶

Gets the current ADC interrupt overflow status.

This function returns the interrupt overflow status for the analog-to-digital converter. An overflow condition is generated irrespective of the continuous mode.

Parameters

base: is the base address of the ADC module.
adcIntNum: is interrupt number within the ADC wrapper.

adcIntNum takes a one of the values ADC_INT_NUMBER1, ADC_INT_NUMBER2, ADC_INT_NUMBER3, or ADC_INT_NUMBER4 to express which of the four interrupts of the ADC module should be cleared.

Return: true if the interrupt overflow flag for the specified interrupt number is set and false if it is not.

void ADC_clearInterruptOverflowStatus(uint32_t base, ADC_IntNumber adcIntNum)¶

Clears ADC interrupt overflow sources.

This function clears the specified ADC interrupt overflow sources so that they no longer assert. If software tries to clear the overflow in the same cycle that hardware tries to set the overflow, then hardware has priority.

Parameters

base: is the base address of the ADC module.
adcIntNum: is interrupt number within the ADC wrapper.

adcIntNum takes a one of the values ADC_INT_NUMBER1, ADC_INT_NUMBER2, ADC_INT_NUMBER3, or ADC_INT_NUMBER4 to express which of the four interrupts of the ADC module should be cleared.

Return: None.

uint16_t ADC_readResult(uint32_t resultBase, ADC_SOCNumber socNumber)¶

Reads the conversion result.

This function returns the conversion result that corresponds to the base address passed into

resultBase and the SOC passed into socNumber.

Parameters

resultBase: is the base address of the ADC results.
socNumber: is the number of the start-of-conversion.

The socNumber number is a value ADC_SOC_NUMBERX where X is a number from 0 to 15 specifying which SOC’s result is to be read.

Note: Take care that you are using a base address for the result registers (ADCxRESULT_BASE) and not a base address for the control registers.
Return: Returns the conversion result.

bool ADC_isBusy(uint32_t base)¶

Determines whether the ADC is busy or not.

This function allows the caller to determine whether or not the ADC is busy and can sample another channel.

Parameters

base: is the base address of the ADC.

Return: Returns true if the ADC is sampling or false if all samples are complete.

void ADC_setBurstModeConfig(uint32_t base, ADC_Trigger trigger, uint16_t burstSize)¶

Set SOC burst mode.

This function configures the burst trigger and burstSize of an ADC module. Burst mode allows a single trigger to walk through the round-robin SOCs one or more at a time. When burst mode is enabled, the trigger selected by the

ADC_setupSOC() API will no longer have an effect on the SOCs in round-robin mode. Instead, the source specified through the trigger parameter will cause a burst of burstSize conversions to occur.

Parameters

base: is the base address of the ADC.
trigger: the source that will cause the burst conversion sequence.
burstSize: is the number of SOCs converted during a burst sequence.

The trigger parameter takes the same values as the ADC_setupSOC() API The burstSize parameter should be a value between 1 and 16 inclusive.

Return: None.

void ADC_enableBurstMode(uint32_t base)¶

Enables SOC burst mode.

This function enables SOC burst mode operation of the ADC. Burst mode allows a single trigger to walk through the round-robin SOCs one or more at a time. When burst mode is enabled, the trigger selected by the

ADC_setupSOC() API will no longer have an effect on the SOCs in round-robin mode. Use ADC_setBurstMode() to configure the burst trigger and size.

Parameters

base: is the base address of the ADC.

Return: None.

void ADC_disableBurstMode(uint32_t base)¶

Disables SOC burst mode.

This function disables SOC burst mode operation of the ADC. SOCs in round-robin mode will be triggered by the trigger configured using the

ADC_setupSOC() API.

Parameters

base: is the base address of the ADC.

Return: None.

void ADC_setSOCPriority(uint32_t base, ADC_PriorityMode priMode)¶

Sets the priority mode of the SOCs.

This function sets the priority mode of the SOCs. There are three main modes that can be passed in the

priMode parameter

Parameters

base: is the base address of the ADC.
priMode: is the priority mode of the SOCs.

All SOCs are in round-robin mode. This means no SOC has an inherent higher priority over another. This is selected by passing in the value ADC_PRI_ALL_ROUND_ROBIN.
All priorities are in high priority mode. This means that the priority of the SOC is determined by its SOC number. This option is selected by passing in the value ADC_PRI_ALL_HIPRI.
A range of SOCs are assigned high priority, with all others in round robin mode. High priority mode means that an SOC with high priority will interrupt the round robin wheel and insert itself as the next conversion. Passing in the value ADC_PRI_SOC0_HIPRI will make SOC0 highest priority, ADC_PRI_THRU_SOC1_HIPRI will put SOC0 and SOC 1 in high priority, and so on up to ADC_PRI_THRU_SOC14_HIPRI where SOCs 0 through 14 are in high priority.

Return: None.

void ADC_configOSDetectMode(uint32_t base, ADC_OSDetectMode modeVal)¶

Configures Open/Shorts Detection Circuit Mode.

This function configures the open/shorts detection circuit mode of the ADC.

Parameters

base: is the base address of the ADC.
modeVal: is the desired open/shorts detection circuit mode.

Return: None.

void ADC_setupPPB(uint32_t base, ADC_PPBNumber ppbNumber, ADC_SOCNumber socNumber)¶

Configures a post-processing block (PPB) in the ADC.

This function associates a post-processing block with a SOC.

Parameters

base: is the base address of the ADC module.
ppbNumber: is the number of the post-processing block.
socNumber: is the number of the start-of-conversion.

The ppbNumber is a value ADC_PPB_NUMBERX where X is a value from 1 to 4 inclusive that identifies a PPB to be configured. The socNumber number is a value ADC_SOC_NUMBERX where X is a number from 0 to 15 specifying which SOC is to be configured on the ADC module specified by base.

Note: You can have more that one PPB associated with the same SOC, but a PPB can only be configured to correspond to one SOC at a time. Also note that when you have multiple PPBs for the same SOC, the calibration offset that actually gets applied will be that of the PPB with the highest number. Since SOC0 is the default for all PPBs, look out for unintentional overwriting of a lower numbered PPB’s offset.
Return: None.

void ADC_enablePPBEvent(uint32_t base, ADC_PPBNumber ppbNumber, uint16_t evtFlags)¶

Enables individual ADC PPB event sources.

This function enables the indicated ADC PPB event sources. This will allow the specified events to propagate through the X-BAR to a pin or to an ePWM module. The

evtFlags parameter can be any of the ADC_EVT_TRIPHI, ADC_EVT_TRIPLO, or ADC_EVT_ZERO values.

Parameters

base: is the base address of the ADC module.
ppbNumber: is the number of the post-processing block.
evtFlags: is a bit mask of the event sources to be enabled.

Return: None.

void ADC_disablePPBEvent(uint32_t base, ADC_PPBNumber ppbNumber, uint16_t evtFlags)¶

Disables individual ADC PPB event sources.

This function disables the indicated ADC PPB event sources. This will stop the specified events from propagating through the X-BAR to other modules. The

evtFlags parameter can be any of the ADC_EVT_TRIPHI, ADC_EVT_TRIPLO, or ADC_EVT_ZERO values.

Parameters

base: is the base address of the ADC module.
ppbNumber: is the number of the post-processing block.
evtFlags: is a bit mask of the event sources to be enabled.

Return: None.

void ADC_enablePPBEventInterrupt(uint32_t base, ADC_PPBNumber ppbNumber, uint16_t intFlags)¶

Enables individual ADC PPB event interrupt sources.

This function enables the indicated ADC PPB interrupt sources. Only the sources that are enabled can be reflected to the processor interrupt. Disabled sources have no effect on the processor. The

intFlags parameter can be any of the ADC_EVT_TRIPHI, ADC_EVT_TRIPLO, or ADC_EVT_ZERO values.

Parameters

base: is the base address of the ADC module.
ppbNumber: is the number of the post-processing block.
intFlags: is a bit mask of the interrupt sources to be enabled.

Return: None.

void ADC_disablePPBEventInterrupt(uint32_t base, ADC_PPBNumber ppbNumber, uint16_t intFlags)¶

Disables individual ADC PPB event interrupt sources.

This function disables the indicated ADC PPB interrupt sources. Only the sources that are enabled can be reflected to the processor interrupt. Disabled sources have no effect on the processor. The

intFlags parameter can be any of the ADC_EVT_TRIPHI, ADC_EVT_TRIPLO, or ADC_EVT_ZERO values.

Parameters

base: is the base address of the ADC module.
ppbNumber: is the number of the post-processing block.
intFlags: is a bit mask of the interrupt source to be disabled.

Return: None.

uint16_t ADC_getPPBEventStatus(uint32_t base, ADC_PPBNumber ppbNumber)¶

Gets the current ADC event status.

This function returns the event status for the analog-to-digital converter.

Parameters

base: is the base address of the ADC module.
ppbNumber: is the number of the post-processing block.

Return: Returns the current event status, enumerated as a bit field of ADC_EVT_TRIPHI, ADC_EVT_TRIPLO, and ADC_EVT_ZERO.

void ADC_clearPPBEventStatus(uint32_t base, ADC_PPBNumber ppbNumber, uint16_t evtFlags)¶

Clears ADC event flags.

This function clears the indicated ADC PPB event flags. After an event occurs this function must be called to allow additional events to be produced. The

evtFlags parameter can be any of the ADC_EVT_TRIPHI, ADC_EVT_TRIPLO, or ADC_EVT_ZERO values.

Parameters

base: is the base address of the ADC module.
ppbNumber: is the number of the post-processing block.
evtFlags: is a bit mask of the event source to be cleared.

Return: None.

int32_t ADC_readPPBResult(uint32_t resultBase, ADC_PPBNumber ppbNumber)¶

Reads the processed conversion result from the PPB.

This function returns the processed conversion result that corresponds to the base address passed into

resultBase and the PPB passed into ppbNumber.

Parameters

resultBase: is the base address of the ADC results.
ppbNumber: is the number of the post-processing block.

Note: Take care that you are using a base address for the result registers (ADCxRESULT_BASE) and not a base address for the control registers.
Return: Returns the signed 32-bit conversion result.

uint16_t ADC_getPPBDelayTimeStamp(uint32_t base, ADC_PPBNumber ppbNumber)¶

Reads sample delay time stamp from a PPB.

This function returns the sample delay time stamp. This delay is the number of system clock cycles between the SOC being triggered and when it began converting.

Parameters

base: is the base address of the ADC module.
ppbNumber: is the number of the post-processing block.

Return: Returns the delay time stamp.

void ADC_setPPBCalibrationOffset(uint32_t base, ADC_PPBNumber ppbNumber, int16_t offset)¶

Sets the post processing block offset correction.

This function sets the PPB offset correction value. This value can be used to digitally remove any system-level offset inherent in the ADCIN circuit before it is stored in the appropriate result register. The

offset parameter is subtracted from the ADC output and is a signed value from -512 to 511 inclusive. For example, when offset = 1, ADCRESULT = ADC output - 1. When offset = -512, ADCRESULT = ADC output - (-512) or ADC output + 512.

Parameters

base: is the base address of the ADC module.
ppbNumber: is the number of the post-processing block.
offset: is the 10-bit signed value subtracted from ADC the output.

Passing a zero in to the offset parameter will effectively disable the calculation, allowing the raw ADC result to be passed unchanged into the result register.

Note: If multiple PPBs are applied to the same SOC, the offset that will be applied will be that of the PPB with the highest number.
Return: None

void ADC_setPPBReferenceOffset(uint32_t base, ADC_PPBNumber ppbNumber, uint16_t offset)¶

Sets the post processing block reference offset.

This function sets the PPB reference offset value. This can be used to either calculate the feedback error or convert a unipolar signal to bipolar by subtracting a reference value. The result will be stored in the appropriate PPB result register which can be read using

ADC_readPPBResult().

Parameters

base: is the base address of the ADC module.
ppbNumber: is the number of the post-processing block.
offset: is the 16-bit unsigned value subtracted from ADC the output.

Passing a zero in to the offset parameter will effectively disable the calculation and will pass the ADC result to the PPB result register unchanged.

Note: If in 12-bit mode, you may only pass a 12-bit value into the offset parameter.
Return: None

void ADC_enablePPBTwosComplement(uint32_t base, ADC_PPBNumber ppbNumber)¶

Enables two’s complement capability in the PPB.

This function enables two’s complement in the post-processing block specified by the

ppbNumber parameter. When enabled, a two’s complement will be performed on the output of the offset subtraction before it is stored in the appropriate PPB result register. In other words, the PPB result will be the reference offset value minus the the ADC result value (ADCPPBxRESULT = ADCSOCxOFFREF - ADCRESULTx).

Parameters

base: is the base address of the ADC module.
ppbNumber: is the number of the post-processing block.

Return: None

void ADC_disablePPBTwosComplement(uint32_t base, ADC_PPBNumber ppbNumber)¶

Disables two’s complement capability in the PPB.

This function disables two’s complement in the post-processing block specified by the

ppbNumber parameter. When disabled, a two’s complement will NOT be performed on the output of the offset subtraction before it is stored in the appropriate PPB result register. In other words, the PPB result will be the ADC result value minus the reference offset value (ADCPPBxRESULT = ADCRESULTx - ADCSOCxOFFREF).

Parameters

base: is the base address of the ADC module.
ppbNumber: is the number of the post-processing block.

Return: None

void ADC_enableInterrupt(uint32_t base, ADC_IntNumber adcIntNum)¶

Enables an ADC interrupt source.

This function enables the indicated ADC interrupt source. Only the sources that are enabled can be reflected to the processor interrupt. Disabled sources have no effect on the processor.

Parameters

base: is the base address of the ADC module.
adcIntNum: is interrupt number within the ADC wrapper.

adcIntNum can take the value ADC_INT_NUMBER1, ADC_INT_NUMBER2, ADC_INT_NUMBER3, or ADC_INT_NUMBER4 to express which of the four interrupts of the ADC module should be enabled.

Return: None.

void ADC_disableInterrupt(uint32_t base, ADC_IntNumber adcIntNum)¶

Disables an ADC interrupt source.

This function disables the indicated ADC interrupt source. Only the sources that are enabled can be reflected to the processor interrupt. Disabled sources have no effect on the processor.

Parameters

base: is the base address of the ADC module.
adcIntNum: is interrupt number within the ADC wrapper.

adcIntNum can take the value ADC_INT_NUMBER1, ADC_INT_NUMBER2, ADC_INT_NUMBER3, or ADC_INT_NUMBER4 to express which of the four interrupts of the ADC module should be disabled.

Return: None.

void ADC_setInterruptSource(uint32_t base, ADC_IntNumber adcIntNum, ADC_SOCNumber socNumber)¶

Sets the source EOC for an analog-to-digital converter interrupt.

This function sets which conversion is the source of an ADC interrupt.

Parameters

base: is the base address of the ADC module.
adcIntNum: is interrupt number within the ADC wrapper.
socNumber: is the number of the start-of-conversion.

The socNumber number is a value ADC_SOC_NUMBERX where X is a number from 0 to 15 specifying which EOC is to be configured on the ADC module specified by base.

adcIntNum can take the value ADC_INT_NUMBER1, ADC_INT_NUMBER2, ADC_INT_NUMBER3, or ADC_INT_NUMBER4 to express which of the four interrupts of the ADC module is being configured.

Return: None.

void ADC_enableContinuousMode(uint32_t base, ADC_IntNumber adcIntNum)¶

Enables continuous mode for an ADC interrupt.

This function enables continuous mode for the ADC interrupt passed into

adcIntNum. This means that pulses will be generated for the specified ADC interrupt whenever an EOC pulse is generated irrespective of whether or not the flag bit is set.

Parameters

base: is the base address of the ADC.
adcIntNum: is interrupt number within the ADC wrapper.

adcIntNum can take the value ADC_INT_NUMBER1, ADC_INT_NUMBER2, ADC_INT_NUMBER3, or ADC_INT_NUMBER4 to express which of the four interrupts of the ADC module is being configured.

Return: None.

void ADC_disableContinuousMode(uint32_t base, ADC_IntNumber adcIntNum)¶

Disables continuous mode for an ADC interrupt.

This function disables continuous mode for the ADC interrupt passed into

adcIntNum. This means that pulses will not be generated for the specified ADC interrupt until the corresponding interrupt flag for the previous interrupt occurrence has been cleared using ADC_clearInterruptStatus().

Parameters

base: is the base address of the ADC.
adcIntNum: is interrupt number within the ADC wrapper.

adcIntNum can take the value ADC_INT_NUMBER1, ADC_INT_NUMBER2, ADC_INT_NUMBER3, or ADC_INT_NUMBER4 to express which of the four interrupts of the ADC module is being configured.

Return: None.

int16_t ADC_getTemperatureC(uint16_t tempResult, float32_t vref)¶

Converts temperature from sensor reading to degrees C

This function converts temperature from temp sensor reading to degrees C. Temp sensor values in production test are derived with 2.5V reference. The

vref argument in the function is used to scale the temp sensor reading accordingly if temp sensor value is read at a different VREF setting.

Parameters

tempResult: is the raw ADC A conversion result from the temp sensor.
vref: is the reference voltage being used (for example 3.3 for 3.3V).

Return: Returns the temperature sensor reading converted to degrees C.

int16_t ADC_getTemperatureK(uint16_t tempResult, float32_t vref)¶

Converts temperature from sensor reading to degrees K

This function converts temperature from temp sensor reading to degrees K. Temp sensor values in production test are derived with 2.5V reference. The

vref argument in the function is used to scale the temp sensor reading accordingly if temp sensor value is read at a different VREF setting.

Parameters

tempResult: is the raw ADC A conversion result from the temp sensor.
vref: is the reference voltage being used (for example 3.3 for 3.3V).

Return: Returns the temperature sensor reading converted to degrees K.

void ADC_setMode(uint32_t base, ADC_Resolution resolution, ADC_SignalMode signalMode)¶

Configures the analog-to-digital converter resolution and signal mode.

This function configures the ADC module’s conversion resolution and input signal mode and ensures that the corresponding trims are loaded.

Parameters

base: is the base address of the ADC module.
resolution: is the resolution of the converter (12 or 16 bits).
signalMode: is the input signal mode of the converter.

The resolution parameter specifies the resolution of the conversion. It can be 12-bit or 16-bit specified by ADC_RESOLUTION_12BIT or ADC_RESOLUTION_16BIT.

The signalMode parameter specifies the signal mode. In single-ended mode, which is indicated by ADC_MODE_SINGLE_ENDED, the input voltage is sampled on a single pin referenced to VREFLO. In differential mode, which is indicated by ADC_MODE_DIFFERENTIAL, the input voltage to the converter is sampled on a pair of input pins, a positive and a negative.

Note: In this device, single-ended signal conversions are supported only in 12-bit resolution mode and differential signal conversions are supported only in 16-bit resolution mode.

Return: None.

void ADC_setPPBTripLimits(uint32_t base, ADC_PPBNumber ppbNumber, int32_t tripHiLimit, int32_t tripLoLimit)¶

Sets the windowed trip limits for a PPB.

This function sets the windowed trip limits for a PPB. These values set the digital comparator so that when one of the values is exceeded, either a high or low trip event will occur.

Parameters

base: is the base address of the ADC module.
ppbNumber: is the number of the post-processing block.
tripHiLimit: is the value is the digital comparator trip high limit.
tripLoLimit: is the value is the digital comparator trip low limit.

The ppbNumber is a value ADC_PPB_NUMBERX where X is a value from 1 to 4 inclusive that identifies a PPB to be configured.

If using 16-bit mode, you may pass a 17-bit number into the tripHiLimit and tripLoLimit parameters where the 17th bit is the sign bit (that is a value from -65536 and 65535). In 12-bit mode, only bits 12:0 will be compared against bits 12:0 of the PPB result.

Note: On some devices, signed trip values do not work properly. See the silicon errata for details.
Return: None.

The code for this module is contained in driverlib/adc.c, with driverlib/adc.h containing the API declarations for use by applications.