adafruit fram read/write

Projects Networking, Protocols, and Devices
1

Read Write to an adafruit I2C fram(adafruit 1895). I have a graph program that records 8 reading a day for 52 days.
The program work fine but when I want to change something the program has to restarts at 0 days on the graph.
On startup I would like to use the fram to reload the global array with the past data. I can read and write to the fram but I'm having trouble getting my head around write and reading 420 data points.

#include <Wire.h> // which uses the I2C interface
#include <Adafruit_FRAM_I2C.h>

Adafruit_FRAM_I2C fram = Adafruit_FRAM_I2C(); // Fram

setup{

Graphsize=420

Wire.begin(); // start up I2C for the RTC
fram.begin(0x51); // Start Fram adress 0x51

void writedata(void) {
int i;
for (i=0; i< graphsize+1; ++i ) // Count to 420
fram.write8(0x51, 53); //write to Fram ?????
}

void readdata(void) {
int i;
for (i=0; i< graphsize+1; ++i ) // count to 420
fram.read8(0x51, 53); //read to Fram ??????
}

2

The Adafruit demo sketch shows you how to read every value from the FRAM memory. Modify to just read the range of data you need.

3 
void readdata(void)  {                       
  int i;
  for (i=0; i< graphsize+1; ++i )                           // clear out the data array
    fram.write8(0x51, 53);                                     //read to Fram   ?????????
  }

This isn't really meant to read anything, is it?

4

Read Write to an adafruit I2C fram(adafruit 1895). I have a graph program that records 8 reading a day for 52 days.
The program work fine but when I want to change something the program has to restarts at 0 days on the graph.
On startup I would like to use the fram to reload the global array with the past data. I can read and write to the fram but I'm having trouble getting my head around write and reading 420 data points. Arduino mega

#include <Wire.h> // which uses the I2C interface
#include <Adafruit_FRAM_I2C.h>

Adafruit_FRAM_I2C fram = Adafruit_FRAM_I2C(); // Fram
setup{
Wire.begin(); // start up I2C for the RTC
fram.begin(0x51); // Start Fram adress 0x51

void writedata(void) {
int i;
for (i=0; i< graphsize+1; ++i ) // count to 420
fram.write8(0x51, 53); //write to Fram ??
}

void readdata(void) {
int i;
for (i=0; i< graphsize+1; ++i ) // count to 420
fram.read8(0x51, 53); //read to Fram ??
}

Yes I can read one at a time. I would like to use “i” with the counter to read data into and out of the array. I just don’t know how to set up fram.read statement to do that.

5

Hi .. I'm using an RTC FM3164 and I just need to read and write the FRAM, but I can not get it. Could you do that? I use thousands of libraries and I do not have a positive result.

6

Yes I can read one at a time. I would like to use "i" with the counter to read data into and out of the array. I just don't know how to set up fram.read statement to do that.

That code still doesn't compile. And learn to use code tags! (that's the </> button in the editor).

write8(address, value);
read8(address);

That's the simple interface (that's not copy/paste code, just in case...) for that library. If you don't understand the concept, please ask questions.

7

This may help to clarify my problem. Just how to write in to an array and then read them back.

test.ino (1023 Bytes)

8

Thanks you Rich555 !!!