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Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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     *
     * Create two new files:
     *     src/spi.c
     *     include/spi.h
     *
     * In "spi.c" declare and implement a function spi_init() that will initialise SPI0 in
     * unbuffered mode, such that data can be written to the shift register that controls
     * the 7-segment display, and which enables the SPI interrupt via the IE bit in INTCTRL.
     * You might also like to enable DISP EN as an output and drive it high so the display
     * is enabled.
     *
     * Next, declare and implement a function spi_write(uint8_t b) which will write the
     * byte b out via the SPI interface.
     *
     * Finally, declare and implement an ISR that will handle the SPI interrupt enabled
     * above, and which will drive a rising edge onto the DISP LATCH net. You might need
     * to add some code to spi_init() if you didn't already enable all the required pins
     * as outputs.
     *

This is my spi.c
#include <avr/io.h>
#include <avr/interrupt.h>
#include "spi.h"

#define DISP_EN_PIN PIN0_bm
#define DISP_LATCH_PIN PIN2_bm

void spi_init(void) {
    PORTA.DIRSET = DISP_EN_PIN | DISP_LATCH_PIN; // Enable DISP_EN and DISP_LATCH as output
    PORTA.OUTSET = DISP_EN_PIN; // Drive DISP_EN high to enable display

    // SPI master mode, unbuffered, MSB first, CPOL=0, CPHA=0, 8-bit data, interrupt enabled
    SPI0.CTRLA = SPI_MASTER_bm | SPI_DORD_bm | SPI_MODE_0_gc | SPI_ENABLE_bm | CPUINT_LVL1VEC_gm;
    SPI0.CTRLB = SPI_BUFEN_bm;
    SPI0.INTCTRL = CPUINT_LVL1VEC_gm;
}

void spi_write(uint8_t b) {
    SPI0.DATA = b;
}

ISR(SPI0_RXC_vect) {
    // Rising edge on DISP LATCH
    PORTC.OUTCLR = PIN0_bm;
    PORTC.OUTSET = PIN0_bm;
}

This is spi.h
#ifndef SPI_H
#define SPI_H

void spi_init(void);
void spi_write(uint8_t b);

#endif

Is anything wrong
usechatgpt init success
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