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cleanup, added comments

This commit is contained in:
Stephane D'Alu 2016-02-09 18:54:05 +01:00
parent d27b447106
commit 9a6ca01c85
1 changed files with 14 additions and 10 deletions
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24
os/hal/ports/NRF51/NRF51822/rng_lld.c
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@ -35,7 +35,6 @@
*/
static const RNGConfig default_config = {
.digital_error_correction = 1,
.power_on_write = 1,
};
/*===========================================================================*/
@ -84,15 +83,16 @@ void rng_lld_start(RNGDriver *rngp) {
if (rngp->config == NULL)
rngp->config = &default_config;
rngp->rng->POWER = 1;
rngp->rng->POWER = 1;
if (rngp->config->digital_error_correction)
rngp->rng->CONFIG |= RNG_CONFIG_DERCEN_Msk;
else
rngp->rng->CONFIG &= ~RNG_CONFIG_DERCEN_Msk;
rngp->rng->INTENSET = RNG_INTENSET_VALRDY_Msk;
rngp->rng->TASKS_START = 1;
rngp->rng->EVENTS_VALRDY = 0;
rngp->rng->INTENSET = RNG_INTENSET_VALRDY_Msk;
rngp->rng->TASKS_START = 1;
}
@ -105,7 +105,7 @@ void rng_lld_start(RNGDriver *rngp) {
*/
void rng_lld_stop(RNGDriver *rngp) {
rngp->rng->TASKS_STOP = 1;
rngp->rng->POWER = 0;
rngp->rng->POWER = 0;
}
@ -121,23 +121,27 @@ void rng_lld_stop(RNGDriver *rngp) {
msg_t rng_lld_write(RNGDriver *rngp, uint8_t *buf, size_t n,
systime_t timeout) {
size_t i;
if (n == 0)
return MSG_OK;
NRF_RNG->EVENTS_VALRDY = 0;
for (i = 0 ; i < n ; i++) {
/* wait for next byte */
/* Wait for byte ready
* It take about 677µs to generate a new byte, not sure if
* forcing a context switch will be a benefit
*/
while (NRF_RNG->EVENTS_VALRDY == 0) {
/* Sleep and wakeup on ARM event (interrupt) */
SCB->SCR |= SCB_SCR_SEVONPEND_Msk;
__SEV();
__WFE();
__WFE();
}
/* Read byte */
buf[i] = (char)NRF_RNG->VALUE;
/* Mark as read */
NRF_RNG->EVENTS_VALRDY = 0;
/* Clear interrupt so we can wake up again */
nvicClearPending(RNG_IRQn);
}
return MSG_OK;