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fixed float printf for F303

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This commit is contained in:
Edward Emelianov
2023-01-17 21:50:52 +03:00
parent a2971ab053
commit 5230ad14e3
12 changed files with 364 additions and 24 deletions
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37
F3:F303/floatPrintf/main.c
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@@ -15,8 +15,10 @@
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <math.h>
#include <stm32f3.h>
#include <string.h>
#include "stm32f3.h"
#include "hardware.h"
#include "usart.h"
@@ -27,12 +29,17 @@ void sys_tick_handler(void){
}
// be careful: if pow10 would be bigger you should change str[] size!
static const float pwr10[] = {1., 10., 100., 1000., 10000.};
static const float rounds[] = {0.5, 0.05, 0.005, 0.0005, 0.00005};
static const float pwr10[] = {1.f, 10.f, 100.f, 1000.f, 10000.f};
static const float rounds[] = {0.5f, 0.05f, 0.005f, 0.0005f, 0.00005f};
#define P10L (sizeof(pwr10)/sizeof(uint32_t) - 1)
static char * float2str(float x, uint8_t prec){
if(prec > P10L) prec = P10L;
static char str[16] = {0}; // -117.5494E-36\0 - 14 symbols max!
if(prec > P10L) prec = P10L;
if(isnan(x)){ memcpy(str, "NAN", 4); return str;}
else{
int i = isinf(x);
if(i){memcpy(str, "-INF", 5); if(i == 1) return str+1; else return str;}
}
char *s = str + 14; // go to end of buffer
uint8_t minus = 0;
if(x < 0){
@@ -89,8 +96,9 @@ static char * float2str(float x, uint8_t prec){
return s+1;
}
static const float tests[] = {-1.23456789e-37, -3.14159265e-2, -1234.56789, -1.2345678, 0., 1e-40, 0.1234567, 123.456789, 2.473829e31};
#define TESTN 9
static const float tests[] = {-1.23456789e-37f, -3.14159265e-2f, -1234.56789f, -1.2345678f, 0.f, 1e-40f, 0.1234567f, 123.456789f, 2.473829e31f,
NAN, INFINITY, -INFINITY};
#define TESTN 12
int main(void){
sysreset();
@@ -100,15 +108,14 @@ int main(void){
usart_setup();
usart_send("Start\n");
uint32_t ctr = Tms;
float x = 0.519, more = 5.123;
float more = 5.123f, ang = 0.f;
while(1){
if(Tms - ctr > 499){
ctr = Tms;
pin_toggle(GPIOB, 1 << 1 | 1 << 0); // toggle LED @ PB0
/**/
if((x += 0.519) > more){
more += 5.123;
}
more += 0.1234567f;
ang += 0.5f;
}
if(bufovr){
bufovr = 0;
@@ -121,6 +128,16 @@ int main(void){
usart_send(float2str(tests[i], j));
usart_putchar('\n');
}
usart_send("\nValue of 'more': ");
usart_send(float2str(more, 4));
usart_send(", sqrt of 'more': ");
usart_send(float2str(sqrtf(more), 4));
usart_send("\nValue of 'ang': ");
usart_send(float2str(ang, 4));
usart_send(", tan of 'ang' degr: ");
usart_send(float2str(tan(ang/180.f*M_PI), 4));
usart_send("\ninf and nan: "); usart_send(float2str(ang/0.f, 4)); usart_putchar(' '); usart_send(float2str(sqrtf(-ang), 4));
usart_putchar('\n');
}else{
usart_send("Get by USART1: ");
usart_send(txt);