9.2.1.3 Workflow

Create a TRNG device instance struct, which will be associated with a TRNG peripheral hardware instance.

static struct trng_module trng_instance;

Create a new function configure_trng(), which will be used to configure the overall TRNG peripheral.

void configure_trng(void)

Create a TRNG peripheral configuration structure that will be filled out to set the module configuration.

struct trng_config config_trng;

Fill the TRNG peripheral configuration structure with the default module configuration values.

trng_get_config_defaults(&config_trng);

Initialize the TRNG peripheral and associate it with the software instance structure that was defined previously.

trng_init(&trng_instance, TRNG, &config_trng);

Create a new callback function.

void trng_complete_callback(struct trng_module *const module_inst)
{
    trng_read_done = true;
}

Create a callback status software flag.

bool volatile trng_read_done = false;

Let the callback function set the flag to true when read job done.

trng_read_done = true;

Create a new function configure_trng_callback(), which will be used to configure the callbacks.

void configure_trng_callback(void)
{
    trng_register_callback(&trng_instance, trng_complete_callback,
            TRNG_CALLBACK_READ_BUFFER);
    trng_enable_callback(&trng_instance, TRNG_CALLBACK_READ_BUFFER);
}

Register callback function.

trng_register_callback(&trng_instance, trng_complete_callback,
        TRNG_CALLBACK_READ_BUFFER);

Enable the callbacks.

trng_enable_callback(&trng_instance, TRNG_CALLBACK_READ_BUFFER);

Enable the now initialized TRNG peripheral.

trng_enable(&trng_instance);