LPCOpen Platform
LPCOpen Platform for NXP LPC Microcontrollers
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ADC example

Functions

static void App_print_ADC_value (uint16_t data)
 
static void App_DMA_Test (void)
 
static void App_Interrupt_Test (void)
 
static void App_Polling_Test (void)
 
void ADC0_IRQHandler (void)
 ADC0 interrupt handler sub-routine.
 
void ADC1_IRQHandler (void)
 ADC1 interrupt handler sub-routine.
 
void DMA_IRQHandler (void)
 DMA interrupt handler sub-routine.
 
int main (void)
 Main routine for ADC example.
 

Variables

static char WelcomeMenu []
 
static char SelectMenu []
 
static uint8_t mode
 
static ADC_Clock_Setup_Type ADCSetup
 
static volatile uint8_t Burst_Mode_Flag = 0
 
static volatile uint8_t Interrupt_Continue_Flag
 
static volatile uint8_t ADC_Interrupt_Done_Flag
 
static volatile uint8_t channelTC
 
static volatile uint8_t dmaChannelNum
 
uint32_t DMAbuffer
 

Detailed Description

This example describes how to use ADC conversion POLLING mode, INTERRUPT mode or DMA mode.

The ADC conversion rate is 400KHz. A full conversion requires 11 of these clocks. So ADC clock = 400KHz * (number of clocks for 1 measure = 11 clocks). Note that maximum ADC clock input is 4.5MHz.

The ADC value can be read in POLLING mode, INTERRUPT mode or DMA mode. Converted ADC values displayed periodically via the UART when Timer 1 ticks. Turn potentiometer to change ADC signal input.

Setting up the demo requires connecting a UART cable between the board and a host PC. The terminal program on the host PC should be setup for 115K8N1. Press the appropriate key via the menu to change the ADC conversion mode.

Build procedure: LPCOpen 18xx/43xx build instructions

Supported boards and board setup:

Submit bug reports for LPCOpen code here.

Function Documentation

void ADC0_IRQHandler ( void  )

ADC0 interrupt handler sub-routine.

Returns
Nothing

Definition at line 233 of file adc.c.

void ADC1_IRQHandler ( void  )

ADC1 interrupt handler sub-routine.

Returns
Nothing

Definition at line 261 of file adc.c.

static void App_DMA_Test ( void  )
static

Definition at line 115 of file adc.c.

static void App_Interrupt_Test ( void  )
static

Definition at line 166 of file adc.c.

static void App_Polling_Test ( void  )
static

Definition at line 193 of file adc.c.

static void App_print_ADC_value ( uint16_t  data)
static

Definition at line 105 of file adc.c.

void DMA_IRQHandler ( void  )

DMA interrupt handler sub-routine.

Returns
Nothing

Definition at line 289 of file adc.c.

int main ( void  )

Main routine for ADC example.

Returns
Nothing

Definition at line 303 of file adc.c.

Variable Documentation

volatile uint8_t ADC_Interrupt_Done_Flag
static

Definition at line 94 of file adc.c.

ADC_Clock_Setup_Type ADCSetup
static

Definition at line 92 of file adc.c.

volatile uint8_t Burst_Mode_Flag = 0
static

Definition at line 93 of file adc.c.

volatile uint8_t channelTC
static

Definition at line 94 of file adc.c.

uint32_t DMAbuffer

Definition at line 95 of file adc.c.

volatile uint8_t dmaChannelNum
static

Definition at line 94 of file adc.c.

volatile uint8_t Interrupt_Continue_Flag
static

Definition at line 93 of file adc.c.

uint8_t mode
static

Definition at line 91 of file adc.c.

char SelectMenu[]
static
Initial value:
= "\r\nPress number 1-3 to choose ADC running mode:\r\n"
"\t1: Polling Mode \r\n"
"\t2: Interrupt Mode \r\n"
"\t3: DMA Mode \r\n"

Definition at line 87 of file adc.c.

char WelcomeMenu[]
static
Initial value:
= "\r\nHello NXP Semiconductors \r\n"
"ADC DEMO \r\n"
"Sample rate : 400kHz \r\n"
"Bit accuracy : 10 bits \r\n"
"Press \'c\' to continue or \'x\' to quit\r\n"
"Press \'o\' or \'p\' to set Sample rate "
"(valid only when Burst mode is enabled)\r\n"
"Press \'k\' or \'l\' to set Bit accuracy\r\n"
"Press \'b\' to ENABLE or DISABLE Burst Mode\r\n"

Definition at line 78 of file adc.c.