Random address on startup

Hi,

thanks for your hints. Your solution was not exactly what I wanted but it shows me the right way. For the records, here is my solution. Maybe someone might find it useful:

The following is valid for DA15483 with SDK5.0.3:

1. In user_config.h .address_src is set to GAPM_PROVIDED_RND_ADDR:

static const struct advertise_configuration user_undirected_advertise_conf ={
/// Advertise operation type.
.advertise_operation=ADV_UNDIRECT,
/// Own BD address source of the device:
.address_src=GAPM_PROVIDED_RND_ADDR,
/// Advertise interval
.intv = 874,
///Advertising channel map
.channel_map = 0x7,
};


2. On startup the following function flash_config_init is executed my_app_init:


typedef struct {
uint32_t header;
struct bd_addr bd_addr;
} Config;


#define CONFIG_HEADER 0xE347FD78 // some random uint32
static Config config;


void flash_config_init(void) {
SPI_Pad_t spi_FLASH_CS_Pad;
spi_FLASH_CS_Pad.pin = SPI_CS_PIN;
spi_FLASH_CS_Pad.port = SPI_GPIO_PORT;
// Enable SPI & SPI FLASH
spi_init(&spi_FLASH_CS_Pad, SPI_MODE_8BIT, SPI_ROLE_MASTER, SPI_CLK_IDLE_POL_LOW, SPI_PHA_MODE_0, SPI_MINT_DISABLE, SPI_XTAL_DIV_8);
spi_flash_init(SPI_FLASH_SIZE, SPI_FLASH_PAGE);
// Power up flash
spi_flash_release_from_power_down();
spi_flash_read_data((uint8_t*)(&config), 0x1D000, sizeof(config));
if(config.header!=CONFIG_HEADER) {
uint8_t rand[16];
trng_acquire(rand);
config.header=CONFIG_HEADER;
memcpy(&config.bd_addr, rand, 6);
spi_flash_block_erase (0 x1d000 SECTOR_ERASE);
spi_flash_write_data((uint8_t*)(&config), 0x1D000, sizeof(config));
}
// Power down flash
spi_flash_power_down();
// Release SPI controller
spi_release();


3. The following code is executed in user_app_adv_start(void):


void user_app_adv_start(void) {
struct bd_addr addr=config.bd_addr
arch_printf("Using BD_ADDR: %02X-%02X-%02X-%02X-%02X-%02X\n", addr.addr[0], addr.addr[1], addr.addr[2], addr.addr[3], addr.addr[4], addr.addr[5]);
struct gapm_start_advertise_cmd* cmd;
cmd = app_easy_gap_undirected_advertise_get_active();
cmd->op.addr=addr;
app_easy_gap_undirected_advertise_start();
}


This method leads to a One-Time-Random-Address, that will only be renewed if the flash is being erased or on the very first startup.

Regards,
Oliver