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« on: August 28, 2012, 04:52:45 am » |
Hi...!!! I want to read a data from another board using SPI(MOSI,MISO,SCK and SS) wires. First I want to read some data as an acknowledgement then I want to send some data.Sending data part code is working fine but reading is happening. Please help me. Sending data Code:- #include <SPI.h>// include the SPI library:
const int spidata = 10;//Pin 11 is data(MOSI) and pin 13 SCK ,set pin 10(SS) as the slave select for the digital pot:
int mm =0;
void setup() {
pinMode (spidata, OUTPUT);// set the spi_data_pin as an output:
SPI.begin();// initialize SPI:
Serial.begin(4800);
}
void loop() {
int arry[16] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
digitalWrite(spidata,LOW);
Serial.println("If condition-1 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[0], BIN);
SPI.transfer(arry[0]); // send in the address and value via SPI:
delay(1500);
Serial.println("If condition-2 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[1], BIN);
SPI.transfer(arry[1]);
delay(1500);
Serial.println("If condition-3 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[2],BIN);
SPI.transfer(arry[2]);
delay(1500);
Serial.println("If condition-4 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[3], BIN);
SPI.transfer(arry[3]);
delay(1500);
Serial.println("If condition-5 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[4], BIN);
SPI.transfer(arry[4]);
delay(1500);
Serial.println("If condition-6 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[5], BIN);
SPI.transfer(arry[5]);
delay(1500);
Serial.println("If condition-7 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[6], BIN);
SPI.transfer(arry[6]);
delay(1500);
Serial.println("If condition-8 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[7], BIN);
SPI.transfer(arry[7]);
Serial.println("If condition-9 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[8], BIN);
SPI.transfer(arry[8]);
delay(1500);
Serial.println("If condition-10 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[9], BIN);
SPI.transfer(arry[9]);
delay(1500);
Serial.println("If condition-11 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[10], BIN);
SPI.transfer(arry[10]);
delay(1500);
Serial.println("If condition-12 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[11], BIN);
SPI.transfer(arry[11]);
delay(1500);
Serial.println("If condition-13 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[12], BIN);
SPI.transfer(arry[12]);
delay(1500);
Serial.println("If condition-14 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[13], BIN);
SPI.transfer(arry[13]);
delay(1500);
Serial.println("If condition-15 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[14], BIN);
SPI.transfer(arry[14]);
delay(1500);
Serial.println("ALL THE CONDITIONS are over now::");
Serial.println("\n");
Serial.println("\n");
digitalWrite(spidata,HIGH);// take the SS pin high to de-select the chip:
delay(1500);
}
Recieving data code:- // Slave
#define SCK_PIN 13
#define MISO_PIN 12
#define MOSI_PIN 11
#define SS_PIN 10
void SlaveInit(void) {
// Set MISO output, all others input
pinMode(SCK_PIN, INPUT);
pinMode(MOSI_PIN, INPUT);
pinMode(MISO_PIN, OUTPUT);
pinMode(SS_PIN, INPUT);
// Enable SPI
SPCR = B00000000;
SPCR = (1<<SPE);
}
byte ReadByte(void) {
while(!(SPSR & (1<<SPIF))) ;
return SPDR;
}
void WriteByte(byte value) {
SPDR = value;
while (!(SPSR & (1<<SPIF))) ;
return;
}
unsigned long lastSent;
void setup() {
Serial.begin(57600);
digitalWrite(5, HIGH);
SlaveInit();
lastSent = millis();
pinMode(5, OUTPUT);
}
void loop() {
if (digitalRead(10) == LOW) {
Serial.println("Pin 10 low...");
byte rxData;
rxData = ReadByte();
Serial.print("Command: ");
Serial.println(rxData, DEC);
if (rxData == 17) {
Serial.println("Sending data to master...");
WriteByte(19);
Serial.println("Done Sending data...");
}
}
if (millis() > lastSent + 2000) {
Serial.println("Pin 5 low...");
digitalWrite(5, LOW);
delay(10);
digitalWrite(5, HIGH);
lastSent = millis();
}
}
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« Last Edit: August 28, 2012, 04:54:33 am by ranjeetray »
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« Reply #1 on: August 28, 2012, 05:00:43 am » |
Hi...!!! I want to read a data from another board using SPI(MOSI,MISO,SCK and SS) wires. First I want to read some data as an acknowledgement then I want to send some data.Sending data part code is working fine but reading is happening. Please help me. Sending data Code:- #include <SPI.h>// include the SPI library:
const int spidata = 10;//Pin 11 is data(MOSI) and pin 13 SCK ,set pin 10(SS) as the slave select for the digital pot:
int mm =0;
void setup() {
pinMode (spidata, OUTPUT);// set the spi_data_pin as an output:
SPI.begin();// initialize SPI:
Serial.begin(4800);
}
void loop() {
int arry[16] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
digitalWrite(spidata,LOW);
Serial.println("If condition-1 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[0], BIN);
SPI.transfer(arry[0]); // send in the address and value via SPI:
delay(1500);
Serial.println("If condition-2 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[1], BIN);
SPI.transfer(arry[1]);
delay(1500);
Serial.println("If condition-3 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[2],BIN);
SPI.transfer(arry[2]);
delay(1500);
Serial.println("If condition-4 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[3], BIN);
SPI.transfer(arry[3]);
delay(1500);
Serial.println("If condition-5 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[4], BIN);
SPI.transfer(arry[4]);
delay(1500);
Serial.println("If condition-6 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[5], BIN);
SPI.transfer(arry[5]);
delay(1500);
Serial.println("If condition-7 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[6], BIN);
SPI.transfer(arry[6]);
delay(1500);
Serial.println("If condition-8 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[7], BIN);
SPI.transfer(arry[7]);
Serial.println("If condition-9 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[8], BIN);
SPI.transfer(arry[8]);
delay(1500);
Serial.println("If condition-10 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[9], BIN);
SPI.transfer(arry[9]);
delay(1500);
Serial.println("If condition-11 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[10], BIN);
SPI.transfer(arry[10]);
delay(1500);
Serial.println("If condition-12 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[11], BIN);
SPI.transfer(arry[11]);
delay(1500);
Serial.println("If condition-13 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[12], BIN);
SPI.transfer(arry[12]);
delay(1500);
Serial.println("If condition-14 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[13], BIN);
SPI.transfer(arry[13]);
delay(1500);
Serial.println("If condition-15 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[14], BIN);
SPI.transfer(arry[14]);
delay(1500);
Serial.println("ALL THE CONDITIONS are over now::");
Serial.println("\n");
Serial.println("\n");
digitalWrite(spidata,HIGH);// take the SS pin high to de-select the chip:
delay(1500);
}
Recieving data code:- // Slave
#define SCK_PIN 13
#define MISO_PIN 12
#define MOSI_PIN 11
#define SS_PIN 10
void SlaveInit(void) {
// Set MISO output, all others input
pinMode(SCK_PIN, INPUT);
pinMode(MOSI_PIN, INPUT);
pinMode(MISO_PIN, OUTPUT);
pinMode(SS_PIN, INPUT);
// Enable SPI
SPCR = B00000000;
SPCR = (1<<SPE);
}
byte ReadByte(void) {
while(!(SPSR & (1<<SPIF))) ;
return SPDR;
}
void WriteByte(byte value) {
SPDR = value;
while (!(SPSR & (1<<SPIF))) ;
return;
}
unsigned long lastSent;
void setup() {
Serial.begin(57600);
digitalWrite(5, HIGH);
SlaveInit();
lastSent = millis();
pinMode(5, OUTPUT);
}
void loop() {
if (digitalRead(10) == LOW) {
Serial.println("Pin 10 low...");
byte rxData;
rxData = ReadByte();
Serial.print("Command: ");
Serial.println(rxData, DEC);
if (rxData == 17) {
Serial.println("Sending data to master...");
WriteByte(19);
Serial.println("Done Sending data...");
}
}
if (millis() > lastSent + 2000) {
Serial.println("Pin 5 low...");
digitalWrite(5, LOW);
delay(10);
digitalWrite(5, HIGH);
lastSent = millis();
}
}
Dear Sir @Nick Gammon Please help me out. |
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« Reply #2 on: August 28, 2012, 05:05:45 am » |
Hi...!!! I want to read a data from another board using SPI(MOSI,MISO,SCK and SS) wires. First I want to read some data as an acknowledgement then I want to send some data.Sending data part code is working fine but reading is happening. Please help me. Sending data Code:- #include <SPI.h>// include the SPI library:
const int spidata = 10;//Pin 11 is data(MOSI) and pin 13 SCK ,set pin 10(SS) as the slave select for the digital pot:
int mm =0;
void setup() {
pinMode (spidata, OUTPUT);// set the spi_data_pin as an output:
SPI.begin();// initialize SPI:
Serial.begin(4800);
}
void loop() {
int arry[16] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
digitalWrite(spidata,LOW);
Serial.println("If condition-1 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[0], BIN);
SPI.transfer(arry[0]); // send in the address and value via SPI:
delay(1500);
Serial.println("If condition-2 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[1], BIN);
SPI.transfer(arry[1]);
delay(1500);
Serial.println("If condition-3 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[2],BIN);
SPI.transfer(arry[2]);
delay(1500);
Serial.println("If condition-4 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[3], BIN);
SPI.transfer(arry[3]);
delay(1500);
Serial.println("If condition-5 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[4], BIN);
SPI.transfer(arry[4]);
delay(1500);
Serial.println("If condition-6 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[5], BIN);
SPI.transfer(arry[5]);
delay(1500);
Serial.println("If condition-7 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[6], BIN);
SPI.transfer(arry[6]);
delay(1500);
Serial.println("If condition-8 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[7], BIN);
SPI.transfer(arry[7]);
Serial.println("If condition-9 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[8], BIN);
SPI.transfer(arry[8]);
delay(1500);
Serial.println("If condition-10 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[9], BIN);
SPI.transfer(arry[9]);
delay(1500);
Serial.println("If condition-11 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[10], BIN);
SPI.transfer(arry[10]);
delay(1500);
Serial.println("If condition-12 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[11], BIN);
SPI.transfer(arry[11]);
delay(1500);
Serial.println("If condition-13 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[12], BIN);
SPI.transfer(arry[12]);
delay(1500);
Serial.println("If condition-14 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[13], BIN);
SPI.transfer(arry[13]);
delay(1500);
Serial.println("If condition-15 Matches then:");
Serial.println("I am writting on SPI");
Serial.println(arry[14], BIN);
SPI.transfer(arry[14]);
delay(1500);
Serial.println("ALL THE CONDITIONS are over now::");
Serial.println("\n");
Serial.println("\n");
digitalWrite(spidata,HIGH);// take the SS pin high to de-select the chip:
delay(1500);
}
Recieving data code:- // Slave
#define SCK_PIN 13
#define MISO_PIN 12
#define MOSI_PIN 11
#define SS_PIN 10
void SlaveInit(void) {
// Set MISO output, all others input
pinMode(SCK_PIN, INPUT);
pinMode(MOSI_PIN, INPUT);
pinMode(MISO_PIN, OUTPUT);
pinMode(SS_PIN, INPUT);
// Enable SPI
SPCR = B00000000;
SPCR = (1<<SPE);
}
byte ReadByte(void) {
while(!(SPSR & (1<<SPIF))) ;
return SPDR;
}
void WriteByte(byte value) {
SPDR = value;
while (!(SPSR & (1<<SPIF))) ;
return;
}
unsigned long lastSent;
void setup() {
Serial.begin(57600);
digitalWrite(5, HIGH);
SlaveInit();
lastSent = millis();
pinMode(5, OUTPUT);
}
void loop() {
if (digitalRead(10) == LOW) {
Serial.println("Pin 10 low...");
byte rxData;
rxData = ReadByte();
Serial.print("Command: ");
Serial.println(rxData, DEC);
if (rxData == 17) {
Serial.println("Sending data to master...");
WriteByte(19);
Serial.println("Done Sending data...");
}
}
if (millis() > lastSent + 2000) {
Serial.println("Pin 5 low...");
digitalWrite(5, LOW);
delay(10);
digitalWrite(5, HIGH);
lastSent = millis();
}
}
Dear Sir @Nick Gammon Please help me out. Dear Sir Even this code is working fine . #include <SPI.h>// include the SPI library:
const int spidata = 10;//Pin 11 is data(MOSI) and pin 13 SCK ,set pin 10(SS) as the slave select for the digital pot:
int mm =0;
void setup() {
pinMode (spidata, OUTPUT);// set the spi_data_pin as an output:
SPI.begin();// initialize SPI:
Serial.begin(4800);
}
void loop() {
for(mm=0; mm<256;mm++){
digitalWrite(spidata,LOW);
Serial.println("I am writting on SPI");
Serial.println(mm, BIN);
SPI.transfer(mm); // send in the address and value via SPI:
digitalWrite(spidata,HIGH);// take the SS pin high to de-select the chip:
delay(1500);}
}
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Seattle, WA USA
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« Reply #3 on: August 28, 2012, 06:17:22 am » |
Even this code is working fine . Then, what IS your problem? |
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Karma: 71
Posts: 6596
Arduino rocks
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« Reply #4 on: August 28, 2012, 01:04:06 pm » |
I think your WriteByte routine is failing to complete the process - it reads SPSR but doesn't read SPDR once there's a byte so the hardware never clears ready for the next byte? To quote the datasheet: the SPIF bit is cleared by first reading the SPI Status Register with SPIF set, then accessing the SPI Data Register (SPDR) How about rewriting WriteByte thus:
byte WriteByte (byte value) {
SPDR = value ;
while (!(SPSR & (1<<SPIF)))
{}
return SPDR ;
}
(So easy to miss a semicolon after a while, use a blank block instead, harder to misread) |
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« Reply #5 on: August 29, 2012, 12:18:42 am » |
Even this code is working fine . Then, what IS your problem? Sir. I am able to send/write data on the SPI but I am not able to read the data, Please help me out. I tried following code also
#include <SPI.h>// include the SPI library:
const int spidata = 10;//Pin 11 is data(MOSI) and pin 13 SCK ,set pin 10(SS) as the slave select for the digital pot:
int mm =0;
//int ReadByte();
void setup() {
pinMode (spidata, OUTPUT);// set the spi_data_pin as an output:
SPI.setDataMode(SPI_MODE3);
SPI.setClockDivider(SPI_CLOCK_DIV8);
SPCR = B00000000;
SPCR = (1<<SPE);
SPI.begin();// initialize SPI:
Serial.begin(4800);
}
byte ReadByte(void) {
while(!(SPSR & (1<<SPIF)))
return SPDR;
}
// int ReadByte(int value) {
// SPDR = value;
// while((!SPSR & (1<<SPIF)))
// return 0;
//}
//byte WriteByte (byte value) {
// SPDR = value ;
// while (!(SPSR & (1<<SPIF)))
// {}
// return SPDR ;
//}
void loop() {
int arry[16] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
int rxData;
digitalWrite(spidata,LOW);
rxData = ReadByte(); // Sir, this part is not working, please help me.
Serial.println("Read value ");
Serial.println(rxData, DEC);
Serial.println("Newline");
//if (rxData == 59) {
Serial.println("If condition-1 Matches and recieves 0x3B from SPI then:");
Serial.println("I am Sending 1st data of 15 data on SPI");
Serial.println(arry[0], BIN);
SPI.transfer(arry[0]); // send in the address and value via SPI:
delay(1500);
Serial.println("I am Sending 2nd data of 15 data on SPI");
Serial.println(arry[1], BIN);
SPI.transfer(arry[1]);
delay(1500);
Serial.println("I am Sending 3rd data of 15 data on SPI");
Serial.println(arry[2],BIN);
SPI.transfer(arry[2]);
delay(1500);
Serial.println("I am Sending 4th data of 15 data on SPI");
Serial.println(arry[3], BIN);
SPI.transfer(arry[3]);
delay(1500);
Serial.println("I am Sending 5th data of 15 data on SPI");
Serial.println(arry[4], BIN);
SPI.transfer(arry[4]);
delay(1500);
Serial.println("I am Sending 6th data of 15 data on SPI");
Serial.println(arry[5], BIN);
SPI.transfer(arry[5]);
delay(1500);
Serial.println("I am Sending 7th data of 15 data on SPI");
Serial.println(arry[6], BIN);
SPI.transfer(arry[6]);
delay(1500);
Serial.println("I am Sending 8th data of 15 data on SPI");
Serial.println(arry[7], BIN);
SPI.transfer(arry[7]);
Serial.println("I am Sending 9th data of 15 data on SPI");
Serial.println(arry[8], BIN);
SPI.transfer(arry[8]);
delay(1500);
Serial.println("I am Sending 10th data of 15 data on SPI");
Serial.println(arry[9], BIN);
SPI.transfer(arry[9]);
delay(1500);
Serial.println("I am Sending 11th data of 15 data on SPI");
Serial.println(arry[10], BIN);
SPI.transfer(arry[10]);
delay(1500);
Serial.println("I am Sending 12th data of 15 data on SPI");
Serial.println(arry[11], BIN);
SPI.transfer(arry[11]);
delay(1500);
Serial.println("I am Sending 13th data of 15 data on SPI");
Serial.println(arry[12], BIN);
SPI.transfer(arry[12]);
delay(1500);
Serial.println("I am Sending 14th data of 15 data on SPI");
Serial.println(arry[13], BIN);
SPI.transfer(arry[13]);
delay(1500);
Serial.println("I am Sending 15th data of 15 data on SPI");
Serial.println(arry[14], BIN);
SPI.transfer(arry[14]);
delay(1500);
Serial.println("ALL 15 datas are sent on SPI, process completed ::");
Serial.println("\n");
Serial.println("\n");
digitalWrite(spidata,HIGH);// take the SS pin high to de-select the chip:
delay(1500);
//}
}
Output of the above code: Read value
0
Newline
If condition-1 Matches and recieves 0x3B from SPI then:
I am Sending 1st data of 15 data on SPI
1
I am Sending 2nd data of 15 data on SPI
10
I am Sending 3rd data of 15 data on SPI
11
I am Sending 4th data of 15 data on SPI
100
I am Sending 5th data of 15 data on SPI
101
I am Sending 6th data of 15 data on SPI
110
I am Sending 7th data of 15 data on SPI
111
I am Sending 8th data of 15 data on SPI
1000
I am Sending 9th data of 15 data on SPI
1001
I am Sending 10th data of 15 data on SPI
1010
I am Sending 11th data of 15 data on SPI
1011
I am Sending 12th data of 15 data on SPI
1100
I am Sending 13th data of 15 data on SPI
1101
I am Sending 14th data of 15 data on SPI
1110
I am Sending 15th data of 15 data on SPI
1111
ALL 15 datas are sent on SPI, process completed ::
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« Last Edit: August 29, 2012, 12:30:26 am by ranjeetray »
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« Reply #6 on: August 29, 2012, 12:41:53 am » |
I think your WriteByte routine is failing to complete the process - it reads SPSR but doesn't read SPDR once there's a byte so the hardware never clears ready for the next byte? To quote the datasheet: the SPIF bit is cleared by first reading the SPI Status Register with SPIF set, then accessing the SPI Data Register (SPDR) How about rewriting WriteByte thus:
byte WriteByte (byte value) {
SPDR = value ;
while (!(SPSR & (1<<SPIF)))
{}
return SPDR ;
}
(So easy to miss a semicolon after a while, use a blank block instead, harder to misread) Sir, I have tried with your suggestion also but it is not able to read from other board which is just keep on pumping the data and giving 0 as output, I have connected MOSI,MISO,CS,SCK wires across the two Arduino boards. Tried code.
#include <SPI.h>// include the SPI library:
const int spidata = 10;//Pin 11 is data(MOSI) and pin 13 SCK ,set pin 10(SS) as the slave select for the digital pot:
int mm =0;
//int ReadByte();
void setup() {
pinMode (spidata, OUTPUT);// set the spi_data_pin as an output:
SPI.setDataMode(SPI_MODE3);
SPI.setClockDivider(SPI_CLOCK_DIV8);
SPCR = B00000000;
SPCR = (1<<SPE);
SPI.begin();// initialize SPI:
Serial.begin(4800);
}
byte ReadByte(void) {
while(!(SPSR & (1<<SPIF)))
return SPDR;
}
// int ReadByte(int value) {
// SPDR = value;
// while((!SPSR & (1<<SPIF)))
// return 0;
//}
//byte WriteByte (byte value) {
// SPDR = value ;
// while (!(SPSR & (1<<SPIF)))
// {}
// return SPDR ;
//}
void loop() {
int arry[16] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
int rxData;
digitalWrite(spidata,LOW);
rxData = ReadByte();
Serial.println("Read value ");
Serial.println(rxData, DEC);
Serial.println("Newline");
//if (rxData == 59) {
Serial.println("If condition-1 Matches and recieves 0x3B from SPI then:");
Serial.println("I am Sending 1st data of 15 data on SPI");
Serial.println(arry[0], BIN);
SPI.transfer(arry[0]); // send in the address and value via SPI:
delay(1500);
Serial.println("I am Sending 2nd data of 15 data on SPI");
Serial.println(arry[1], BIN);
SPI.transfer(arry[1]);
delay(1500);
Serial.println("I am Sending 3rd data of 15 data on SPI");
Serial.println(arry[2],BIN);
SPI.transfer(arry[2]);
delay(1500);
Serial.println("I am Sending 4th data of 15 data on SPI");
Serial.println(arry[3], BIN);
SPI.transfer(arry[3]);
delay(1500);
Serial.println("I am Sending 5th data of 15 data on SPI");
Serial.println(arry[4], BIN);
SPI.transfer(arry[4]);
delay(1500);
Serial.println("I am Sending 6th data of 15 data on SPI");
Serial.println(arry[5], BIN);
SPI.transfer(arry[5]);
delay(1500);
Serial.println("I am Sending 7th data of 15 data on SPI");
Serial.println(arry[6], BIN);
SPI.transfer(arry[6]);
delay(1500);
Serial.println("I am Sending 8th data of 15 data on SPI");
Serial.println(arry[7], BIN);
SPI.transfer(arry[7]);
Serial.println("I am Sending 9th data of 15 data on SPI");
Serial.println(arry[8], BIN);
SPI.transfer(arry[8]);
delay(1500);
Serial.println("I am Sending 10th data of 15 data on SPI");
Serial.println(arry[9], BIN);
SPI.transfer(arry[9]);
delay(1500);
Serial.println("I am Sending 11th data of 15 data on SPI");
Serial.println(arry[10], BIN);
SPI.transfer(arry[10]);
delay(1500);
Serial.println("I am Sending 12th data of 15 data on SPI");
Serial.println(arry[11], BIN);
SPI.transfer(arry[11]);
delay(1500);
Serial.println("I am Sending 13th data of 15 data on SPI");
Serial.println(arry[12], BIN);
SPI.transfer(arry[12]);
delay(1500);
Serial.println("I am Sending 14th data of 15 data on SPI");
Serial.println(arry[13], BIN);
SPI.transfer(arry[13]);
delay(1500);
Serial.println("I am Sending 15th data of 15 data on SPI");
Serial.println(arry[14], BIN);
SPI.transfer(arry[14]);
delay(1500);
Serial.println("ALL 15 datas are sent on SPI, process completed ::");
Serial.println("\n");
Serial.println("\n");
digitalWrite(spidata,HIGH);// take the SS pin high to de-select the chip:
delay(1500);
//}
}
Output of the above code which reads "0"
[code]
Read value
0
Newline
If condition-1 Matches and recieves 0x3B from SPI then:
I am Sending 1st data of 15 data on SPI
1
I am Sending 2nd data of 15 data on SPI
10
I am Sending 3rd data of 15 data on SPI
11
I am Sending 4th data of 15 data on SPI
100
I am Sending 5th data of 15 data on SPI
101
I am Sending 6th data of 15 data on SPI
110
I am Sending 7th data of 15 data on SPI
111
I am Sending 8th data of 15 data on SPI
1000
I am Sending 9th data of 15 data on SPI
1001
I am Sending 10th data of 15 data on SPI
1010
I am Sending 11th data of 15 data on SPI
1011
I am Sending 12th data of 15 data on SPI
1100
I am Sending 13th data of 15 data on SPI
1101
I am Sending 14th data of 15 data on SPI
1110
I am Sending 15th data of 15 data on SPI
1111
ALL 15 datas are sent on SPI, process completed ::
[/code] |
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« Reply #7 on: August 29, 2012, 12:59:38 am » |
Even this code is working fine . Then, what IS your problem? Sir, Please help me out on this. |
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« Reply #8 on: August 29, 2012, 01:00:52 am » |
I think your WriteByte routine is failing to complete the process - it reads SPSR but doesn't read SPDR once there's a byte so the hardware never clears ready for the next byte? To quote the datasheet: the SPIF bit is cleared by first reading the SPI Status Register with SPIF set, then accessing the SPI Data Register (SPDR) How about rewriting WriteByte thus:
byte WriteByte (byte value) {
SPDR = value ;
while (!(SPSR & (1<<SPIF)))
{}
return SPDR ;
}
(So easy to miss a semicolon after a while, use a blank block instead, harder to misread) Sir, Please help me out on this. |
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Shannon Member
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Posts: 13896
Lua rocks!
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« Reply #9 on: August 29, 2012, 01:25:46 am » |
If you are going to ignore the questions, and ignore the suggested corrections, please don't keep re-posting "Please help me out on this".
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Shannon Member
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Posts: 13896
Lua rocks!
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« Reply #10 on: August 29, 2012, 01:26:51 am » |
Even this code is working fine . Then, what IS your problem? Sir, Please help me out on this. That is not a meaningful answer to the question "what IS your problem?". |
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« Reply #11 on: August 29, 2012, 02:01:08 am » |
If you are going to ignore the questions, and ignore the suggested corrections, please don't keep re-posting "Please help me out on this".
Sir, I am using two Arduino board, from one board I am able to send the data which is available on oscilloscope. But when I read from another board, it is not able to read. byte ReadByte(void) {
while(!(SPSR & (1<<SPIF)))
return SPDR;
}
void loop() {
int rxData;
digitalWrite(spidata,LOW);
rxData = ReadByte();
Serial.println("Read value ");
Serial.println(rxData, DEC);
digitalWrite(spidata,HIGH);
}
Sir, this read function is returning 0. Please suggest something. |
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« Last Edit: August 29, 2012, 02:09:44 am by ranjeetray »
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Shannon Member
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Lua rocks!
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« Reply #12 on: August 29, 2012, 02:06:42 am » |
Please edit your post, select the code, and put it between [code] ... [/code] tags.
You can do that by hitting the # button above the posting area.
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« Reply #13 on: August 29, 2012, 02:07:21 am » |
If you are going to ignore the questions, and ignore the suggested corrections, please don't keep re-posting "Please help me out on this".
Dear Sir I am using two arduino board for SPI communication. I am sending data from one board which is happening and data is available on oscilloscope. But when I try to read from with another board it is reading the data. Data Sending Code
#include <SPI.h>// include the SPI library:
const int spidata = 10;//Pin 11 is data(MOSI) and pin 13 SCK ,set pin 10(SS) as the slave select for the digital pot:
int mm =0;
void setup() {
pinMode (spidata, OUTPUT);// set the spi_data_pin as an output:
SPI.begin();// initialize SPI:
Serial.begin(9600);
}
void loop() {
digitalWrite(spidata,LOW);
SPI.transfer(1);
digitalWrite(spidata,HIGH);
delay(1500);
}
Data Recieving code: #include <SPI.h>// include the SPI library:
const int spidata = 10;//Pin 11 is data(MOSI) and pin 13 SCK ,set pin 10(SS) as the slave select for the digital pot:
void setup() {
pinMode (spidata, INPUT);// set the spi_data_pin as an output:
SPI.setDataMode(SPI_MODE3);
SPI.setClockDivider(SPI_CLOCK_DIV8);
SPI.begin();// initialize SPI:
Serial.begin(9600);}
byte ReadByte(void) {
while(!(SPSR & (1<<SPIF)))
return SPDR;
}
void loop() {
int rxData;
digitalWrite(spidata,LOW);
rxData = ReadByte();
Serial.println("Read value ");
Serial.println(rxData, DEC);
digitalWrite(spidata,HIGH);
delay(1500);
}
Sir, please help me. Sorry I had replied him like this only before then again I asked him to help me. Read value is coming as "0". |
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Shannon Member
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Posts: 13896
Lua rocks!
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« Reply #14 on: August 29, 2012, 02:08:26 am » |
OK, now re-read reply #4 and explain why you ignored his suggestion.
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| Arduino Forum :: Using Arduino :: Networking, Protocols, and Devices :: SPI interface with other board_AVR_ESK1100 or among Arduino itself