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Code Example

MCP4921.h

#include <msp430.h>

#include "delay.h"

#define SW_SPI_DIR P2DIR

#define SW_SPI_OUT P2OUT

#define SW_SPI_IN P2IN

#define SCK_pin BIT0

#define CS_pin BIT1

#define SDI_pin BIT2

#define LDAC_pin BIT3

#define SCK_DIR_OUT() do{SW_SPI_DIR |= SCK_pin;}while(0)

#define SCK_DIR_IN() do{SW_SPI_DIR &= ~SCK_pin;}while(0)

#define CS_DIR_OUT() do{SW_SPI_DIR |= CS_pin;}while(0)

#define CS_DIR_IN() do{SW_SPI_DIR &= ~CS_pin;}while(0)

#define SDI_DIR_OUT() do{SW_SPI_DIR |= SDI_pin;}while(0)

#define SDI_DIR_IN() do{SW_SPI_DIR &= ~SDI_pin;}while(0)

#define LDAC_DIR_OUT() do{SW_SPI_DIR |= LDAC_pin;}while(0)

#define LDAC_DIR_IN() do{SW_SPI_DIR &= ~LDAC_pin;}while(0)

#define SCK_HIGH() do{SW_SPI_OUT |= SCK_pin;}while(0)

#define SCK_LOW() do{SW_SPI_OUT &= ~SCK_pin;}while(0)

#define CS_HIGH() do{SW_SPI_OUT |= CS_pin;}while(0)

#define CS_LOW() do{SW_SPI_OUT &= ~CS_pin;}while(0)

#define SDI_HIGH() do{SW_SPI_OUT |= SDI_pin;}while(0)

#define SDI_LOW() do{SW_SPI_OUT &= ~SDI_pin;}while(0)

#define LDAC_HIGH() do{SW_SPI_OUT |= LDAC_pin;}while(0)

#define LDAC_LOW() do{SW_SPI_OUT &= ~LDAC_pin;}while(0)

#define ignore_cmd 0x80

#define DAC_write_cmd 0x00

#define Buffer_on 0x40

#define Buffer_off 0x00

#define Gain_1X 0x20

#define Gain_2X 0x00

#define Run_cmd 0x10

#define Shutdown 0x00

void MCP4921_init(void);

void MCP4921_write(unsigned char cmd, unsigned int dac_value);

MCP4921.c

#include "MCP4921.h"

void MCP4921_init(void)

{

CS_DIR_OUT();

SCK_DIR_OUT();

Brand	Texas Instruments
Model	MSP430
Category	Microcontrollers
Language	English

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