CC2530: osal_nv read/write

Jack Loop

Part Number: CC2530

Hi,

I've been trying to test the below to check if a boolean var, REVERSED, had been stored in NV. If not, then it would assign it to false; then write to NV. However, the next time the CC2530 is powered on, it always assigns REVERSED to false again. It seems like I am doing something wrong here. How can I fix this?

  osal_nv_read(nv_test_id, 0, 1, &REVERSED);
  if((REVERSED != true) || (REVERSED != false))
    REVERSED = false;
  osal_nv_write(nv_test_id, 0, 1, &REVERSED);

over 7 years ago

0 YiKai Chen over 7 years ago

Guru 735695 points

What is your nv_test_id? Do you erase chip when you say "next time the CC2530 is powered on"?

0 Jack Loop over 7 years ago in reply to YiKai Chen

Guru 17870 points

The id is 0x0401. I don't erase chip.

0 YiKai Chen over 7 years ago in reply to Jack Loop

Guru 735695 points

Try to add "osal_nv_item_init(nv_test_id, 1, NULL);" before you use nv_test_id.

0 Jack Loop over 7 years ago in reply to YiKai Chen

Guru 17870 points

It doesn't seem to fix to the problem.

0 YiKai Chen over 7 years ago in reply to Jack Loop

Guru 735695 points

What is data type of your variable REVERSED?

0 Jack Loop over 7 years ago in reply to YiKai Chen

Guru 17870 points

boolean

0 YiKai Chen over 7 years ago in reply to Jack Loop

Guru 735695 points

Try to use uint8 and use 1 to stands for ture and 0 stands for false.

0 Jack Loop over 7 years ago in reply to YiKai Chen

Guru 17870 points

I tried and I noticed that NV write/read work (Tested again with boolean, and it works too). After NV read, the REVERSED is read as 0 - however, the program still enters the if statement. Why is this so?

0 YiKai Chen over 7 years ago in reply to Jack Loop

Guru 735695 points

Can you post your latest code?

0 Jack Loop over 7 years ago in reply to YiKai Chen

Guru 17870 points

I also tested with bool again, and I get the same results as uint8.

  osal_nv_item_init(nv_test_id, 1, NULL); 
  osal_nv_read(nv_test_id, 0, 1, &REVERSED);
  
  if((REVERSED != 1) || (REVERSED != 0))
    REVERSED = 0
  osal_nv_write(nv_test_id, 0, 1, &REVERSED);

  osal_nv_item_init(nv_test_id, 1, NULL); 
  osal_nv_read(nv_test_id, 0, 1, &REVERSED);
  
  if((REVERSED != true) || (REVERSED != false))
    REVERSED = false;
  osal_nv_write(nv_test_id, 0, 1, &REVERSED);

0 YiKai Chen over 7 years ago in reply to Jack Loop

Guru 735695 points

Why do you use the following code? What's the logic of it? You check "(REVERSED != 1)" inside "if(...)" so it will enter the case when REVERSED is read as 0

if((REVERSED != 1) || (REVERSED != 0))
REVERSED = 0

0 Jack Loop over 7 years ago in reply to YiKai Chen

Guru 17870 points

I need to use 1 more NV ID. What other id should I use?

0 YiKai Chen over 7 years ago in reply to Jack Loop

Guru 735695 points

Use 0x0402.

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CC2530: osal_nv read/write