Thank you very much. With your help I could manage to write some code so I can easilly send data from my main program code using BLE.
If anybody else has some problems to start with here is how I did it:
uint8_t ble_flag;
uint8_t ble_buffer[247];
- Make ble_flag and ble_buffer globally accessable in custom_app.c using "extern".
Also create a function ble_updateChar() in custom_app.c wich is called to update the specific characteristic.
//Prototype
void ble_updateChar(uint8_t char_identifier);
//External buffer
extern uint8_t ble_flag;
extern uint8_t ble_buffer[]
//Function
void ble_updateChar(uint8_t char_identifier)
{
//Check for idetifier to update
if(char_identifier == myChar)
{
//Check if new data is available
if(ble_flag == ON)
{
//Update Char
Custom_STM_App_Update_Char(CUSTOM_STM_CHAR, ble_buffer);
//Reset Flag
ble_flag = OFF;
}
}
}
- Take care of the parameters for the Custom_STM_App_Update_Char()-Function. The first item is the CharOpcode and varies according to the name of your characteristic. You can find your correct Opcode for the characteristic you want to update in custom_stm.h. Edit the given function.
Additionally, I am using the custom parameter char_parameter in my function. Like this, I can select my desired characteristic I want to update when calling ble_updateChar(char_parameter). In case you have multiple char's you want to access copy the if-condition and edit the CharOpcode,... according to it. - Now you can fill your ble_buffer[] anywhere in the code you want with data. When finished, you can set your "new data indicator" ble_flag to 1 and call the function ble-updateChar(myChar).
//Fill BLE-Buffer with data
ble_buffer[0] = 5;
//Send buffer
ble_flag = ON;
ble_updateChar(myChar);
- The ble_updateChar() function is called, updates the characteristic and sends a notification to your client, e.g. the smartphone app "BLE Toolbox".
I know this is a really quick and dirty approach and definitely this can be done better.
But in my opinion it was quite difficult to start and the resources and tutorial aren't that straight forward like I wanted them to be.
So maybe this helps somebody with the first BLE-Steps on a STM32WB-Chip. I think from there you can improve your code and make something better and more professional.
