26df161 EEPROM SPI
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Чт, 02/07/2015 - 17:41
Пытаюсь подключить EEPROM память по SPI к Arduino но ничего неполучатся
Подключал по следующей схемо:
Как подключать и обращатся брат отсюда :https://www.arduino.cc/en/Tutorial/SPIEEPROM
Код использовал следующий:
byte read_eeprom(int EEPROM_address) { //READ EEPROM int data; digitalWrite(SLAVESELECT,LOW); spi_transfer(READ); //transmit read opcode spi_transfer((char)(EEPROM_address>>8)); //send MSByte address first spi_transfer((char)(EEPROM_address)); //send LSByte address data = spi_transfer(0xFF); //get data byte digitalWrite(SLAVESELECT,HIGH); //release chip, signal end transfer return data; } For easy copy and pasting the full program text of this tutorial is below: #define DATAOUT 11//MOSI #define DATAIN 12//MISO #define SPICLOCK 13//sck #define SLAVESELECT 10//ss //opcodes #define WREN 6 #define WRDI 4 #define RDSR 5 #define WRSR 1 #define READ 3 #define WRITE 2 byte eeprom_output_data; byte eeprom_input_data=0; byte clr; int address=0; //data buffer char buffer [128]; void fill_buffer() { for (int I=0;I<128;I++) { buffer[I]=I; } } char spi_transfer(volatile char data) { SPDR = data; // Start the transmission while (!(SPSR & (1<<SPIF))) // Wait the end of the transmission { }; return SPDR; // return the received byte } void setup() { Serial.begin(9600); pinMode(DATAOUT, OUTPUT); pinMode(DATAIN, INPUT); pinMode(SPICLOCK,OUTPUT); pinMode(SLAVESELECT,OUTPUT); digitalWrite(SLAVESELECT,HIGH); //disable device // SPCR = 01010000 //interrupt disabled,spi enabled,msb 1st,master,clk low when idle, //sample on leading edge of clk,system clock/4 rate (fastest) SPCR = (1<<SPE)|(1<<MSTR); clr=SPSR; clr=SPDR; delay(10); //fill buffer with data fill_buffer(); //fill eeprom w/ buffer digitalWrite(SLAVESELECT,LOW); spi_transfer(WREN); //write enable digitalWrite(SLAVESELECT,HIGH); delay(10); digitalWrite(SLAVESELECT,LOW); spi_transfer(WRITE); //write instruction address=0; spi_transfer((char)(address>>8)); //send MSByte address first spi_transfer((char)(address)); //send LSByte address //write 128 bytes for (int I=0;I<128;I++) { spi_transfer(buffer[I]); //write data byte } digitalWrite(SLAVESELECT,HIGH); //release chip //wait for eeprom to finish writing delay(3000); Serial.print('h',BYTE); Serial.print('i',BYTE); Serial.print('\n',BYTE);//debug delay(1000); } byte read_eeprom(int EEPROM_address) { //READ EEPROM int data; digitalWrite(SLAVESELECT,LOW); spi_transfer(READ); //transmit read opcode spi_transfer((char)(EEPROM_address>>8)); //send MSByte address first spi_transfer((char)(EEPROM_address)); //send LSByte address data = spi_transfer(0xFF); //get data byte digitalWrite(SLAVESELECT,HIGH); //release chip, signal end transfer return data; } void loop() { eeprom_output_data = read_eeprom(address); Serial.print(eeprom_output_data,DEC); Serial.print('\n',BYTE); address++; if (address == 128) address = 0; delay(500); //pause for readability }
В ответ получаю одни нули, подскажите как правельно работать с памятью.