jepler/1009-GPS_Derived_RF_Generator
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eeprom_data: introduce a structure to load/save settings to eeprom

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Jeff Epler 2019-03-09 10:21:09 -06:00 committed by Jeff Epler
parent f1acb908c0
commit 815d006787
1 changed files with 12 additions and 5 deletions
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17
RFout1MHzV1_06/RFout1MHzV1_06.ino
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@ -361,6 +361,10 @@ bool strapped_for_passthrough() {
return result;
}
struct eeprom_data {
uint32_t freq;
};
unsigned long GetEEPROM_CRC(void) {
@ -373,7 +377,7 @@ unsigned long GetEEPROM_CRC(void) {
unsigned long crc = ~0L;
for (int index = 0 ; index < sizeof(freq) ; ++index) {
for (int index = 0 ; index < sizeof(eeprom_data) ; ++index) {
crc = crc_table[(crc ^ EEPROM[index]) & 0x0f] ^ (crc >> 4);
crc = crc_table[(crc ^ (EEPROM[index] >> 4)) & 0x0f] ^ (crc >> 4);
crc = ~crc;
@ -384,9 +388,10 @@ unsigned long GetEEPROM_CRC(void) {
void SaveToEPROM ()
{
unsigned long CRCFromEEPROM;
EEPROM.put(0, freq); //Save the Freqency to EEPROM at address0
eeprom_data e = {freq};
EEPROM.put(0, e); //Save the Freqency to EEPROM at address0
CRCFromEEPROM=GetEEPROM_CRC (); //Calculate CRC on the saved data
EEPROM.put(sizeof(freq), CRCFromEEPROM); //Save the CRC after the data
EEPROM.put(sizeof(eeprom_data), CRCFromEEPROM); //Save the CRC after the data
}
@ -394,9 +399,11 @@ bool LoadFromEPROM (void)
{
unsigned long CRCFromEEPROM,CalculatedCRC;
EEPROM.get(0, freq); //Load the Frequency from EEPROM address 0
EEPROM.get(sizeof(freq), CRCFromEEPROM); //Load the CRC value that is stored in EEPROM
eeprom_data e;
EEPROM.get(0, &e); //Load the Frequency from EEPROM address 0
EEPROM.get(sizeof(eeprom_data), CRCFromEEPROM); //Load the CRC value that is stored in EEPROM
CalculatedCRC=GetEEPROM_CRC(); //Calculate the CRC of the Frequency
freq = e.freq;
return (CRCFromEEPROM==CalculatedCRC); //If Stored and Calculated CRC are the same then return true
}