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younder
Joined: 24 Jan 2013
Posts: 53
Location: Brazil
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| Write/read float to internal DSPic30F eeprom - SOLVED! |
 Posted: Sat Jan 21, 2017 10:47 am |
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Hi Guys,
DSPic30F4012
Compiler V5.051
I'm trying to use the example available in the "C:\Program Files\PICC\Drivers\internal_eeprom.c" for Reading and writing a float32 to internal DSpic30F eeprom but It did not worked yet.
| Code: |
// Purpose: Write a 32 bit floating point number to internal eeprom
// Inputs: 1) An eeprom address. Four eeprom locations will be used.
// 2) The floating point number to write to internal eeprom
// Outputs: None
void write_eeprom_float(unsigned int16 address, float32 data)
{
write_eeprom(address, &data, 4);
}
// Purpose: Read a 32 bit floating point number from internal eeprom
// Inputs: An eeprom address
// Outputs: The floating point number read from the internal eeprom
float32 read_eeprom_float(unsigned int16 address)
{
float32 data;
read_eeprom(address, &data, 4);
return(data);
}
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| Code: |
//Totalizer_Km & Totalizer_L are Float Type
//*** Write ***
write_eeprom_float(0x06, Totalizer_Km); //0x06 & 0x07
delay_ms(2);
write_eeprom_float(0x08, Totalizer_L); //0x08 & 0x09
delay_ms(2);
//*** Read ***
Totalizer_Km=read_eeprom_float(0x06);
Totalizer_L=read_eeprom_float(0x08);
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Any help would be very appreciated!
Hugo
_________________
Hugo Silva
Last edited by younder on Sun Jan 22, 2017 9:24 am; edited 1 time in total |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sat Jan 21, 2017 9:22 pm |
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I don't have PCD so I can't test it. But if I did, the first thing I would do
is try addresses that have more separation between them. Just as a test:
| Code: |
write_eeprom_float(0x10, Totalizer_Km);
delay_ms(2);
write_eeprom_float(0x20, Totalizer_L);
delay_ms(2);
//*** Read ***
Totalizer_Km = read_eeprom_float(0x10);
Totalizer_L = read_eeprom_float(0x20);
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Also, with the PCM and PCH compilers the compiler waits in a polling loop
until the write eeprom is done. No external delay is necessary. I suspect
the same thing is true for PCD.
I noticed that the function names you're using are different than what
I have in vs. 5.066 in internal_eeprom.c. I have the names shown below,
with the word 'eeprom' at the end:
| Code: |
void write_float_eeprom(INT_EEPROM_ADDRESS address, float32 data)
float32 read_float_eeprom(INT_EEPROM_ADDRESS address) |
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younder
Joined: 24 Jan 2013
Posts: 53
Location: Brazil
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| Posted: Sun Jan 22, 2017 9:23 am |
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Thanks PCM programmer! you hit the nail right in the head! It was my mistake... we need 4 bytes in the eeprom for storing a float variable... the data was overwriting 2 bytes - We can close this tread
_________________
Hugo Silva |
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