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https://github.com/RobTillaart/Arduino.git
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78 lines
1.4 KiB
C++
78 lines
1.4 KiB
C++
//
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// FILE: FRAM_logging.ino
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// AUTHOR: Rob Tillaart
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// PURPOSE: demo persistant logging in FRAM.
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// URL: https://github.com/RobTillaart/FRAM_I2C
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// experimental code
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// todo - read back sketch.
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//
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// last written position uint32_t at addres 0..3
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// log entry: plain text separated by newlines.
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// timestamp + \t + random number +\n
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// wraps around if FRAM full => might give corrupted one corrupted line.
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//
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#include "FRAM.h"
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FRAM fram;
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uint32_t start;
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uint32_t stop;
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uint32_t sizeInBytes = 0;
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void setup()
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{
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Serial.begin(115200);
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Serial.println(__FILE__);
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Serial.print("FRAM_LIB_VERSION: ");
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Serial.println(FRAM_LIB_VERSION);
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Wire.begin();
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int rv = fram.begin(0x50);
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if (rv != 0)
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{
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Serial.print("INIT ERROR: ");
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Serial.println(rv);
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}
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// get size in bytes
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sizeInBytes = fram.getSize() * 1024;
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// clear FRAM
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for (uint32_t addr = 0; addr < sizeInBytes; addr++)
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{
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fram.write8(addr, 0x00);
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}
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fram.write32(0, 0x00000004);
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}
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void loop()
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{
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char buffer[24];
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sprintf(buffer, "%ld\t%ld\n", millis(), random());
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Serial.print(buffer);
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log2fram(buffer);
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delay(1000);
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}
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void log2fram(char * str)
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{
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uint32_t len = strlen(str);
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// might skip reading logaddr and make it static.
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uint32_t logaddr = fram.read32(0);
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if (logaddr + len > sizeInBytes) logaddr = 0x04; // start at begin
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fram.write(logaddr, (uint8_t *)str, len);
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logaddr += len;
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fram.write32(0, logaddr);
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}
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// -- END OF FILE --
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