Started following some tutorial on att85 usi. Downloaded example code from make avr book.
This commit is contained in:
Dan
105
Make AVR Examples/Chapter16_SPI/spiEEPROMDemo/25LC256.c
Normal file
105
Make AVR Examples/Chapter16_SPI/spiEEPROMDemo/25LC256.c
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#include "25LC256.h"
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void initSPI(void) {
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SPI_SS_DDR |= (1 << SPI_SS); /* set SS output */
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SPI_SS_PORT |= (1 << SPI_SS); /* start off not selected (high) */
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SPI_MOSI_DDR |= (1 << SPI_MOSI); /* output on MOSI */
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SPI_MISO_PORT |= (1 << SPI_MISO); /* pullup on MISO */
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SPI_SCK_DDR |= (1 << SPI_SCK); /* output on SCK */
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/* Don't have to set phase, polarity b/c
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* default works with 25LCxxx chips */
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SPCR |= (1 << SPR1); /* div 16, safer for breadboards */
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SPCR |= (1 << MSTR); /* clockmaster */
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SPCR |= (1 << SPE); /* enable */
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}
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void SPI_tradeByte(uint8_t byte) {
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SPDR = byte; /* SPI starts sending immediately */
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loop_until_bit_is_set(SPSR, SPIF); /* wait until done */
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/* SPDR now contains the received byte */
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}
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void EEPROM_send16BitAddress(uint16_t address) {
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SPI_tradeByte((uint8_t) (address >> 8)); /* most significant byte */
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SPI_tradeByte((uint8_t) address); /* least significant byte */
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}
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uint8_t EEPROM_readStatus(void) {
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SLAVE_SELECT;
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SPI_tradeByte(EEPROM_RDSR);
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SPI_tradeByte(0); /* clock out eight bits */
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SLAVE_DESELECT;
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return (SPDR); /* return the result */
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}
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void EEPROM_writeEnable(void) {
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SLAVE_SELECT;
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SPI_tradeByte(EEPROM_WREN);
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SLAVE_DESELECT;
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}
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uint8_t EEPROM_readByte(uint16_t address) {
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SLAVE_SELECT;
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SPI_tradeByte(EEPROM_READ);
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EEPROM_send16BitAddress(address);
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SPI_tradeByte(0);
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SLAVE_DESELECT;
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return (SPDR);
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}
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uint16_t EEPROM_readWord(uint16_t address) {
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uint16_t eepromWord;
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SLAVE_SELECT;
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SPI_tradeByte(EEPROM_READ);
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EEPROM_send16BitAddress(address);
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SPI_tradeByte(0);
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eepromWord = SPDR;
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eepromWord = (eepromWord << 8); /* most-sig bit */
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SPI_tradeByte(0);
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eepromWord += SPDR; /* least-sig bit */
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SLAVE_DESELECT;
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return (eepromWord);
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}
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void EEPROM_writeByte(uint16_t address, uint8_t byte) {
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EEPROM_writeEnable();
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SLAVE_SELECT;
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SPI_tradeByte(EEPROM_WRITE);
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EEPROM_send16BitAddress(address);
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SPI_tradeByte(byte);
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SLAVE_DESELECT;
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while (EEPROM_readStatus() & _BV(EEPROM_WRITE_IN_PROGRESS)) {;
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}
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}
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void EEPROM_writeWord(uint16_t address, uint16_t word) {
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EEPROM_writeEnable();
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SLAVE_SELECT;
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SPI_tradeByte(EEPROM_WRITE);
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EEPROM_send16BitAddress(address);
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SPI_tradeByte((uint8_t) (word >> 8));
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SPI_tradeByte((uint8_t) word);
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SLAVE_DESELECT;
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while (EEPROM_readStatus() & _BV(EEPROM_WRITE_IN_PROGRESS)) {;
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}
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}
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void EEPROM_clearAll(void) {
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uint8_t i;
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uint16_t pageAddress = 0;
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while (pageAddress < EEPROM_BYTES_MAX) {
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EEPROM_writeEnable();
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SLAVE_SELECT;
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SPI_tradeByte(EEPROM_WRITE);
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EEPROM_send16BitAddress(pageAddress);
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for (i = 0; i < EEPROM_BYTES_PER_PAGE; i++) {
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SPI_tradeByte(0);
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}
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SLAVE_DESELECT;
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pageAddress += EEPROM_BYTES_PER_PAGE;
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while (EEPROM_readStatus() & _BV(EEPROM_WRITE_IN_PROGRESS)) {;
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}
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}
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}
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60
Make AVR Examples/Chapter16_SPI/spiEEPROMDemo/25LC256.h
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60
Make AVR Examples/Chapter16_SPI/spiEEPROMDemo/25LC256.h
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/* SPI EEPROM 25LC256 Library */
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#include <avr/io.h>
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#include "pinDefines.h"
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/* Which pin selects EEPROM as slave? */
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#define SLAVE_SELECT SPI_SS_PORT &= ~(1 << SPI_SS)
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#define SLAVE_DESELECT SPI_SS_PORT |= (1 << SPI_SS)
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// Instruction Set -- from data sheet
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#define EEPROM_READ 0b00000011 /* read memory */
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#define EEPROM_WRITE 0b00000010 /* write to memory */
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#define EEPROM_WRDI 0b00000100 /* write disable */
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#define EEPROM_WREN 0b00000110 /* write enable */
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#define EEPROM_RDSR 0b00000101 /* read status register */
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#define EEPROM_WRSR 0b00000001 /* write status register */
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// EEPROM Status Register Bits -- from data sheet
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// Use these to parse status register
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#define EEPROM_WRITE_IN_PROGRESS 0
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#define EEPROM_WRITE_ENABLE_LATCH 1
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#define EEPROM_BLOCK_PROTECT_0 2
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#define EEPROM_BLOCK_PROTECT_1 3
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#define EEPROM_BYTES_PER_PAGE 64
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#define EEPROM_BYTES_MAX 0x7FFF
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// Functions
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/* Init SPI to run EEPROM with phase, polarity = 0,0 */
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void initSPI(void);
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/* Generic. Just loads up HW SPI register and waits */
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void SPI_tradeByte(uint8_t byte);
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/* splits 16-bit address into 2 bytes, sends both */
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void EEPROM_send16BitAddress(uint16_t address);
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/* reads the EEPROM status register */
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uint8_t EEPROM_readStatus(void);
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/* helper: sets EEPROM write enable */
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void EEPROM_writeEnable(void);
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/* gets a byte from a given memory location */
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uint8_t EEPROM_readByte(uint16_t address);
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/* gets two bytes from a given memory location */
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uint16_t EEPROM_readWord(uint16_t address);
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/* writes a byte to a given memory location */
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void EEPROM_writeByte(uint16_t address, uint8_t byte);
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/* gets two bytes to a given memory location */
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void EEPROM_writeWord(uint16_t address, uint16_t word);
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/* sets every byte in memory to zero */
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void EEPROM_clearAll(void);
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196
Make AVR Examples/Chapter16_SPI/spiEEPROMDemo/Makefile
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196
Make AVR Examples/Chapter16_SPI/spiEEPROMDemo/Makefile
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@@ -0,0 +1,196 @@
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##########------------------------------------------------------##########
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########## Project-specific Details ##########
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########## Check these every time you start a new project ##########
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##########------------------------------------------------------##########
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MCU = atmega168p
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F_CPU = 1000000UL
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BAUD = 9600UL
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## Also try BAUD = 19200 or 38400 if you're feeling lucky.
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## A directory for common include files and the simple USART library.
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## If you move either the current folder or the Library folder, you'll
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## need to change this path to match.
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LIBDIR = ../../AVR-Programming-Library
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##########------------------------------------------------------##########
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########## Programmer Defaults ##########
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########## Set up once, then forget about it ##########
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########## (Can override. See bottom of file.) ##########
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##########------------------------------------------------------##########
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PROGRAMMER_TYPE = usbtiny
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# extra arguments to avrdude: baud rate, chip type, -F flag, etc.
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PROGRAMMER_ARGS =
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##########------------------------------------------------------##########
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########## Program Locations ##########
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########## Won't need to change if they're in your PATH ##########
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##########------------------------------------------------------##########
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CC = avr-gcc
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OBJCOPY = avr-objcopy
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OBJDUMP = avr-objdump
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AVRSIZE = avr-size
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AVRDUDE = avrdude
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##########------------------------------------------------------##########
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########## Makefile Magic! ##########
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########## Summary: ##########
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########## We want a .hex file ##########
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########## Compile source files into .elf ##########
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########## Convert .elf file into .hex ##########
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########## You shouldn't need to edit below. ##########
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##########------------------------------------------------------##########
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## The name of your project (without the .c)
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# TARGET = blinkLED
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## Or name it automatically after the enclosing directory
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TARGET = $(lastword $(subst /, ,$(CURDIR)))
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# Object files: will find all .c/.h files in current directory
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# and in LIBDIR. If you have any other (sub-)directories with code,
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# you can add them in to SOURCES below in the wildcard statement.
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SOURCES=$(wildcard *.c $(LIBDIR)/*.c)
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OBJECTS=$(SOURCES:.c=.o)
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HEADERS=$(SOURCES:.c=.h)
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## Compilation options, type man avr-gcc if you're curious.
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CPPFLAGS = -DF_CPU=$(F_CPU) -DBAUD=$(BAUD) -I. -I$(LIBDIR)
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CFLAGS = -Os -g -std=gnu99 -Wall
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## Use short (8-bit) data types
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CFLAGS += -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums
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## Splits up object files per function
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CFLAGS += -ffunction-sections -fdata-sections
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LDFLAGS = -Wl,-Map,$(TARGET).map
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## Optional, but often ends up with smaller code
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LDFLAGS += -Wl,--gc-sections
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## Relax shrinks code even more, but makes disassembly messy
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## LDFLAGS += -Wl,--relax
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## LDFLAGS += -Wl,-u,vfprintf -lprintf_flt -lm ## for floating-point printf
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## LDFLAGS += -Wl,-u,vfprintf -lprintf_min ## for smaller printf
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TARGET_ARCH = -mmcu=$(MCU)
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## Explicit pattern rules:
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## To make .o files from .c files
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%.o: %.c $(HEADERS) Makefile
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$(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c -o $@ $<;
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$(TARGET).elf: $(OBJECTS)
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$(CC) $(LDFLAGS) $(TARGET_ARCH) $^ $(LDLIBS) -o $@
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%.hex: %.elf
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$(OBJCOPY) -j .text -j .data -O ihex $< $@
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%.eeprom: %.elf
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$(OBJCOPY) -j .eeprom --change-section-lma .eeprom=0 -O ihex $< $@
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%.lst: %.elf
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$(OBJDUMP) -S $< > $@
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## These targets don't have files named after them
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.PHONY: all disassemble disasm eeprom size clean squeaky_clean flash fuses
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all: $(TARGET).hex
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debug:
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@echo
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@echo "Source files:" $(SOURCES)
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@echo "MCU, F_CPU, BAUD:" $(MCU), $(F_CPU), $(BAUD)
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@echo
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# Optionally create listing file from .elf
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# This creates approximate assembly-language equivalent of your code.
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# Useful for debugging time-sensitive bits,
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# or making sure the compiler does what you want.
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disassemble: $(TARGET).lst
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disasm: disassemble
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# Optionally show how big the resulting program is
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size: $(TARGET).elf
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$(AVRSIZE) -C --mcu=$(MCU) $(TARGET).elf
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clean:
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rm -f $(TARGET).elf $(TARGET).hex $(TARGET).obj \
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$(TARGET).o $(TARGET).d $(TARGET).eep $(TARGET).lst \
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$(TARGET).lss $(TARGET).sym $(TARGET).map $(TARGET)~ \
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$(TARGET).eeprom
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squeaky_clean:
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rm -f *.elf *.hex *.obj *.o *.d *.eep *.lst *.lss *.sym *.map *~ *.eeprom
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##########------------------------------------------------------##########
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########## Programmer-specific details ##########
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########## Flashing code to AVR using avrdude ##########
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##########------------------------------------------------------##########
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flash: $(TARGET).hex
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$(AVRDUDE) -c $(PROGRAMMER_TYPE) -p $(MCU) $(PROGRAMMER_ARGS) -U flash:w:$<
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## An alias
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program: flash
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flash_eeprom: $(TARGET).eeprom
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$(AVRDUDE) -c $(PROGRAMMER_TYPE) -p $(MCU) $(PROGRAMMER_ARGS) -U eeprom:w:$<
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avrdude_terminal:
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$(AVRDUDE) -c $(PROGRAMMER_TYPE) -p $(MCU) $(PROGRAMMER_ARGS) -nt
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## If you've got multiple programmers that you use,
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## you can define them here so that it's easy to switch.
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## To invoke, use something like `make flash_arduinoISP`
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flash_usbtiny: PROGRAMMER_TYPE = usbtiny
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flash_usbtiny: PROGRAMMER_ARGS = # USBTiny works with no further arguments
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flash_usbtiny: flash
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flash_usbasp: PROGRAMMER_TYPE = usbasp
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flash_usbasp: PROGRAMMER_ARGS = # USBasp works with no further arguments
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flash_usbasp: flash
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flash_arduinoISP: PROGRAMMER_TYPE = avrisp
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flash_arduinoISP: PROGRAMMER_ARGS = -b 19200 -P /dev/ttyACM0
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## (for windows) flash_arduinoISP: PROGRAMMER_ARGS = -b 19200 -P com5
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flash_arduinoISP: flash
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flash_109: PROGRAMMER_TYPE = avr109
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flash_109: PROGRAMMER_ARGS = -b 9600 -P /dev/ttyUSB0
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flash_109: flash
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##########------------------------------------------------------##########
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########## Fuse settings and suitable defaults ##########
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##########------------------------------------------------------##########
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## Mega 48, 88, 168, 328 default values
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LFUSE = 0x62
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HFUSE = 0xdf
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EFUSE = 0x00
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## Generic
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FUSE_STRING = -U lfuse:w:$(LFUSE):m -U hfuse:w:$(HFUSE):m -U efuse:w:$(EFUSE):m
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fuses:
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$(AVRDUDE) -c $(PROGRAMMER_TYPE) -p $(MCU) \
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$(PROGRAMMER_ARGS) $(FUSE_STRING)
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show_fuses:
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$(AVRDUDE) -c $(PROGRAMMER_TYPE) -p $(MCU) $(PROGRAMMER_ARGS) -nv
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## Called with no extra definitions, sets to defaults
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set_default_fuses: FUSE_STRING = -U lfuse:w:$(LFUSE):m -U hfuse:w:$(HFUSE):m -U efuse:w:$(EFUSE):m
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set_default_fuses: fuses
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## Set the fuse byte for full-speed mode
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## Note: can also be set in firmware for modern chips
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set_fast_fuse: LFUSE = 0xE2
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set_fast_fuse: FUSE_STRING = -U lfuse:w:$(LFUSE):m
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set_fast_fuse: fuses
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## Set the EESAVE fuse byte to preserve EEPROM across flashes
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set_eeprom_save_fuse: HFUSE = 0xD7
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set_eeprom_save_fuse: FUSE_STRING = -U hfuse:w:$(HFUSE):m
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set_eeprom_save_fuse: fuses
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## Clear the EESAVE fuse byte
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clear_eeprom_save_fuse: FUSE_STRING = -U hfuse:w:$(HFUSE):m
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clear_eeprom_save_fuse: fuses
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@@ -0,0 +1,55 @@
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/* SPI EEPROM 25LC256 Demo */
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// ------- Preamble -------- //
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#include <avr/io.h>
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#include <util/delay.h>
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#include "pinDefines.h"
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#include "USART.h"
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#include "25LC256.h"
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int main(void) {
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uint8_t i;
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uint8_t address;
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// -------- Inits --------- //
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initSPI();
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initUSART();
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// ------ Event loop ------ //
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while (1) {
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printString("\r\n==== EEPROM Memory Playground ====\r\n");
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printString("Address Value\r\n");
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for (i = 0; i < 10; i++) { /* print out first ten bytes of memory */
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printString(" ");
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printByte(i);
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printString(" ");
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printByte(EEPROM_readByte(i));
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printString("\r\n");
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}
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printString(" [e] to erase all memory\r\n");
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printString(" [w] to write byte to memory\r\n\r\n");
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switch (receiveByte()) { /* take input */
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case 'e':
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printString("Clearing EEPROM, this could take a few seconds.\r\n");
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EEPROM_clearAll();
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break;
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case 'w':
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printString("Which memory slot would you like to write to?\r\n");
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address = getNumber();
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printString("\r\nWhat number would you like to store there?\r\n");
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i = getNumber();
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EEPROM_writeByte(address, i);
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printString("\r\n");
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break;
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default:
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printString("What??\r\n");
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}
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} /* End event loop */
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return 0; /* This line is never reached */
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}
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