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#include "project.h"
#define P1_N GPIO12
#define P1_N_PORT GPIOB
#define P1_P GPIO13
#define P1_P_PORT GPIOB
#define P2_N GPIO14
#define P2_N_PORT GPIOB
#define P2_P GPIO15
#define P2_P_PORT GPIOB
unsigned gauge_target;
static unsigned gauge_current;
#define GUAGE_N_STATE 6
static unsigned gauge_state;
static inline unsigned
ccw (unsigned v)
{
v += GUAGE_N_STATE - 1;
if (v >= GUAGE_N_STATE)
v -= GUAGE_N_STATE;
return v;
}
static inline unsigned
cw (unsigned v)
{
v += 1;
if (v >= GUAGE_N_STATE)
v -= GUAGE_N_STATE;
return v;
}
static inline void
p1 (int i)
{
if (i < 0) {
SET (P1_N);
CLEAR (P1_P);
} else if (i > 0) {
CLEAR (P1_N);
SET (P1_P);
} else {
CLEAR (P1_N);
CLEAR (P1_P);
}
}
static inline void
p2 (int i)
{
if (i < 0) {
SET (P2_N);
CLEAR (P2_P);
} else if (i > 0) {
CLEAR (P2_N);
SET (P2_P);
} else {
CLEAR (P2_N);
CLEAR (P2_P);
}
}
void
gauge_ticker (void)
{
if (gauge_current < gauge_target) {
gauge_state = cw (gauge_state);
gauge_current++;
} else if (gauge_current > gauge_target) {
gauge_state = ccw (gauge_state);
gauge_current--;
}
switch (gauge_state) {
case 0:
p1 (1);
p2 (1);
break;
case 1:
p1 (1);
p2 (0);
break;
case 2:
p1 (0);
p2 (-1);
break;
case 3:
p1 (-1);
p2 (-1);
break;
case 4:
p1 (-1);
p2 (0);
break;
case 5:
p1 (0);
p2 (1);
}
}
void
gauge_test (void)
{
char buf[8];
uint32_t now = dwt_read_cycle_counter(); /*This wraps every 59.9 seconds or so */
now &= 0x3fffffff; /* now wraps every 15s */
now = now / (0x3fffffff / 810);
gauge_target = now;
sprintf (buf, "%3d", gauge_target);
font8x8_put_str (vram_1, buf, 90, 24);
}
void
gauge_init (void)
{
MAP_OUTPUT_PP (P1_N);
MAP_OUTPUT_PP (P1_P);
MAP_OUTPUT_PP (P2_N);
MAP_OUTPUT_PP (P2_P);
}
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