State of the EEPROM After a Download

[email protected] #24245 Does anyone know the state of the EEPROM after a new program is downloaded? Erased or left alone? i.e. is the calibration factor clobbered? What's the value of EEPROM cells 0-3 before calibaration is done for the first time? Thanks, James KE4MIQ
Jack Purdum #24262 I'm pretty sure that a "virgin" Nano's EEPROM has each memory cell set to 255. The EEPROM is unaffected by an IDE upload, unless the program changes the EEPROM memory. Jack, W8TEE toggle quoted message Show quoted text From: "jmlynesjr@..." <jmlynesjr@...> To: [email protected] Sent: Thursday, March 30, 2017 7:25 PM Subject: [BITX20] State of the EEPROM After a Download Does anyone know the state of the EEPROM after a new program is downloaded? Erased or left alone? i.e. is the calibration factor clobbered? What's the value of EEPROM cells 0-3 before calibaration is done for the first time? Thanks, James KE4MIQ
[email protected] #24291 Thanks Jack. Think I will set a flag byte(ox55) in the EEPROM and check it in setup() to not adjust the si5351 with a bogus cal value. James KE4MIQ
Noel All Messages By This Member #24388 From other projects I have made with custom EEPROM settings, I have found the EEPROM is unchanged untill there is a write or put performed. -- 73 de Noel, ZL1NC

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