I am trying to read a SRAM chip and send HEX SRAM cell address from my Arduino to PC but I am having a problem. When I try to send and display the address of SRAM cell in HEX such as 0000 from the pc to the arduino seems to display 0 not 0000 the byte. Is there any solution can be implemented to let it work? Thank you!
typedef unsigned short u16;
typedef unsigned char u8;
int CE = 50;
int OE = 51;
int WE = 52;
void setup() {
// put your setup code here, to run once:
pinMode(CE, OUTPUT);//Set PB3(50) as outputs(chip enable)
pinMode(OE, OUTPUT);//Set PB2(51) as outputs(output enable)
pinMode(WE, OUTPUT);//Set PB1(52) as outputs(write enable)
DDRA = B11111111;//Set PortA as outputs(Data)
DDRC = B11111111;//Set PortC as outputs(Address)
DDRL = B11111111;//Set PortL as outputs(Address)
Serial.begin(9600);
}
void loop() {
u8 r_data = 0;
u8 w_data = 0xFF;
u16 addr; //SRAM address
/*SRAM Init*/
SRAM_Init( );
/*Write the SRAM*/
//SRAM_Write(addr,w_data);
for(addr=0;addr<=0x7FFF;addr++){
/*Read the SRAM*/
r_data = SRAM_Read(addr);
displayInfo(addr,r_data);
}
while(1){
}
}
/*SRAM Init*/
void SRAM_Init(void){
digitalWrite(CE, HIGH);
digitalWrite(WE, HIGH);
digitalWrite(OE, HIGH);
}
/*Write 8-bit data to SRAM. Write cycle No.1 (/WE controlled)*/
void SRAM_Write( u16 addr, u8 data){
/*Put the address lines 9X6*/
PORTC = (u8)(addr&0x00FF);
PORTL = (u8)((addr&0x7F00)>>8);
/*Begin the write cycle*/
digitalWrite(WE, HIGH);
digitalWrite(OE, HIGH);
digitalWrite(CE, LOW);//Select the chip
/*Send data to SRAM*/
PORTA = (u8)data;
digitalWrite(WE, LOW);
digitalWrite(WE, HIGH);
digitalWrite(CE, HIGH);
}
/*Read from SRAM. Read cycle No.2 (WE = HIGH)*/
unsigned char SRAM_Read(u16 addr){
unsigned char val = 0;//Store data
/*Setup for data input*/
DDRA = B00000000;//Set PortA as inputs(Data)
digitalWrite(CE, HIGH);//Deselect chip
/*Put the address lines 9X6*/
PORTC = (u8)(addr&0x00FF);
PORTL = (u8)((addr&0x7F00)>>8);
/*Begin read cycle*/
digitalWrite(WE, HIGH);
digitalWrite(OE, HIGH);
digitalWrite(CE, LOW);//Select the chip
digitalWrite(OE, LOW);//Output enable
val = PINA;
digitalWrite(OE, HIGH);
/*End read cycle*/
digitalWrite(CE, HIGH);//Deselect chip
return val;
}
/*Display the information*/
void displayInfo(u16 index, u8 message){
//Serial.println("The testing address is: ");
Serial.print((u8)((index&0x7F00)>>8),HEX);
Serial.print((u8)(index&0x00FF),HEX);
Serial.print("\t");
//Serial.print("The received data pattren is: ");
for(int b = 0;b<=7;b++)
{ //Serial.print((u8)((index&0x7F00)>>8),HEX);
//Serial.print((u8)(index&0x00FF),HEX);
//Serial.print(b,DEC);
//Serial.print("\t");
Serial.print(bitRead(message,b));
}
Serial.println();
}
