EMTime/libopencm3-examples
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[Stylecheck] F0, F1, F4

Browse Source 
There are remaining C99 comments.
This commit is contained in:
Frantisek Burian
2014-01-23 19:06:13 +01:00
parent 022cc475bf
commit 3f47411e24
22 changed files with 203 additions and 159 deletions
Download Patch File Download Diff File Expand all files Collapse all files

42
examples/stm32/f4/stm32f4-discovery/random/random.c
View File

@@ -15,7 +15,6 @@
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libopencm3/cm3/common.h>
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/gpio.h>
@@ -37,8 +36,9 @@ static void rng_setup(void)
/* Enable interupt */
/* Set the IE bit in the RNG_CR register. */
RNG_CR |= RNG_CR_IE;
/* Enable the random number generation by setting the RNGEN bit in the RNG_CR
register. This activates the analog part, the RNG_LFSR and the error detector.
/* Enable the random number generation by setting the RNGEN bit in
the RNG_CR register. This activates the analog part, the RNG_LFSR
and the error detector.
*/
RNG_CR |= RNG_CR_RNGEN;
}
@@ -46,43 +46,51 @@ static void rng_setup(void)
static void gpio_setup(void)
{
/* Setup onboard led */
gpio_mode_setup(GPIOD, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO12 | GPIO13);
gpio_mode_setup(GPIOD, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE,
GPIO12 | GPIO13);
}
/* Tried to folow the guidelines in the stm32f4 user manual.*/
static uint32_t random_int(void)
{
static uint32_t last_value=0;
static uint32_t new_value=0;
static uint32_t last_value;
static uint32_t new_value;
uint32_t error_bits = 0;
error_bits = RNG_SR_SEIS | RNG_SR_CEIS;
while (new_value==last_value) {
while (new_value == last_value) {
/* Check for error flags and if data is ready. */
if ( ((RNG_SR & error_bits) == 0) && ( (RNG_SR & RNG_SR_DRDY) == 1 ) )
new_value=RNG_DR;
if (((RNG_SR & error_bits) == 0) &&
((RNG_SR & RNG_SR_DRDY) == 1)) {
new_value = RNG_DR;
}
}
last_value=new_value;
last_value = new_value;
return new_value;
}
int main(void)
{
int i,j;
int i, j;
rcc_setup();
gpio_setup();
rng_setup();
while(1){
while (1) {
uint32_t rnd;
rnd = random_int();
for(i=0;i!=32;++i){
if ( (rnd & (1 << i))!=0 )
for (i = 0; i != 32; i++) {
if ((rnd & (1 << i)) != 0) {
gpio_set(GPIOD, GPIO12);
else
} else {
gpio_clear(GPIOD, GPIO12);
}
/* Delay */
for(j=0;j!=5000000;++j)
for (j = 0; j != 5000000; j++) {
__asm__("nop");
}
}
}
}
}