Texas Instruments MSP430

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Code Example

SPI.h

#include <msp430.h>

unsigned char SPI_transfer(unsigned char data_out);

SPI.c

#include "SPI.h"

unsigned char SPI_transfer(unsigned char data_out)

{

unsigned char data_in = 0;

USISRL = data_out; // Load shift register with data byte to be TXed

USICNT = 8; // Load bit-counter to send/receive data byte

while (!(USIIFG & USICTL1)); // Loop until data byte transmitted

data_in = USISRL; // Read out the received data

return data_in;

}

MAX72xx.h

#include <MSP430.h>

#include "delay.h"

#include "SPI.h"

#define HW_SPI_DIR P1DIR

#define HW_SPI_OUT P1OUT

#define HW_SPI_IN P1IN

#define CS_pin BIT4

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

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

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

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

#define NOP 0x00

#define DIG0 0x01

#define DIG1 0x02

#define DIG2 0x03

#define DIG3 0x04

#define DIG4 0x05

#define DIG5 0x06

#define DIG6 0x07

#define DIG7 0x08

#define decode_mode_reg 0x09

#define intensity_reg 0x0A

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