26.8.2.1.3 Workflow
- Create a TRNG device instance struct, which will be associated with a TRNG peripheral hardware instance.
static
struct
trng_module trng_instance;
Note: Device instance structures shall never go out of scope when in use. - 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);
Note: This should not be done until after the TRNG is set up and ready to be used.