LPC18xx/43xx DAC example

Detailed Description

Example description
This example shows how to use DAC peripheral with 3 modes: POLLING mode, INTERRUPT mode or DMA mode.

DAC will be initialized with maximum current is 700uA. This allows a maximum update rate of 1Mhz DAC updated values have range from 0 to 0x3FF. So AOUT output voltage will change from: Vss to VDD. This example configures pin P4_4 as analog function for DAC output through ENAIO2 register. Run and observe AOUT signal by oscilloscope.

Use UART to monitor this demo.

Special connection requirements

• Hitex LPC1850EVA-A4-2 and LPC4350EVA-A4-2 boards (AOUT: X16.4 (X16 connector - pin LCDVD1))
  

Build procedures:
LPC18xx/43xx example quickstart for Keil uVision4
LPC18xx/43xx example quickstart for IAR EWARM
LPC18xx/43xx example quickstart for Code Red Xpresso

Supported boards and board setup:
Hitex 1850 evaluation boards
Hitex 4350 evaluation boards
Keil 1857 evaluation boards
Keil 4357 evaluation boards

Submitting LPCOpen issues:
Community support for LPCOpen

Macros
#define	DATA_SIZE   0x400

Functions
static void	App_DMA_Test (void)
static void	App_Interrupt_Test (void)
static void	App_Polling_Test (void)
void	DAC_IRQHandler (void)
	DAC interrupt handler sub-routine.
void	DMA_IRQHandler (void)
	DMA interrupt handler sub-routine.
int	main (void)
	Main routine for DAC example.

Variables
static char	WelcomeMenu []
static char	SelectMenu []
static volatile uint8_t	channelTC
static volatile uint8_t	dmaChannelNum
static volatile uint8_t	DAC_Interrupt_Done_Flag
static volatile uint8_t	Interrupt_Continue_Flag
uint32_t	DMAbuffer

Macro Definition Documentation

#define DATA_SIZE   0x400

Definition at line 71 of file dac.c.

Function Documentation

static void App_DMA_Test ( void  )

static

Definition at line 91 of file dac.c.

static void App_Interrupt_Test ( void  )

static

Definition at line 132 of file dac.c.

static void App_Polling_Test ( void  )

static

Definition at line 160 of file dac.c.

void DAC_IRQHandler

(

void

)

DAC interrupt handler sub-routine.

Returns

Nothing

Definition at line 186 of file dac.c.

void DMA_IRQHandler

(

void

)

DMA interrupt handler sub-routine.

Returns

Nothing

Definition at line 199 of file dac.c.

int main

(

void

)

Main routine for DAC example.

Main program body.

Returns

Nothing

Definition at line 213 of file dac.c.

Variable Documentation

volatile uint8_t channelTC

static

Definition at line 79 of file dac.c.

volatile uint8_t DAC_Interrupt_Done_Flag

static

Definition at line 80 of file dac.c.

uint32_t DMAbuffer

Definition at line 81 of file dac.c.

volatile uint8_t dmaChannelNum

static

Definition at line 79 of file dac.c.

volatile uint8_t Interrupt_Continue_Flag

static

Definition at line 80 of file dac.c.

char SelectMenu[]

static

Initial value:

= "\r\nPress number 1-3 to choose DAC running mode:\r\n"
         "\t1: Polling Mode \r\n"
         "\t2: Interrupt Mode \r\n"
         "\t3: DMA Mode \r\n"

Definition at line 75 of file dac.c.

char WelcomeMenu[]

static

Initial value:

= "\r\nHello NXP Semiconductors \r\n"
       "DAC DEMO \r\n"
       "Press \'c\' to continue or \'x\' to quit\r\n"

Definition at line 72 of file dac.c.