+++ /dev/null
-#include <avr/io.h>
-
-#include "lights.h"
-
-static unsigned char pwm_vals[N_PWMLEDS*N_PWMLED_MODES];
-static unsigned char adc_vals[N_PWMLEDS*N_PWMLED_MODES] = {
- /* pwmled0 */
- 0x04, 0x14, 0x24, 0x38,
- /* pwmled1 */
- 0x04, 0x14, 0x24, 0x38,
- /* pwmled2 */
- 0x04, 0x14, 0x24, 0x38,
-};
-
-// TODO: maybe convert this to bitmask to simplify pwmled_needs_adc() ?
-static unsigned char pwmled_state[N_PWMLEDS];
-#define ST_DISABLED 0
-#define ST_PROBING 1
-#define ST_OFF 2
-#define ST_ON 3
-
-static unsigned char pwmled_mode[N_PWMLEDS];
-static unsigned char pwmled_mode_set[N_PWMLEDS];
-
-static unsigned char pwm_probes[N_PWMLEDS];
-
-static void start_probing(unsigned char n)
-{
- pwmled_state[n] = ST_PROBING;
- pwm_set(n, 0);
- pwm_on(n);
- pwm_probes[n] = 0;
-}
-
-void pwmled_init()
-{
- unsigned char i;
-
- for (i = 0; i < N_PWMLEDS*N_PWMLED_MODES; i++) {
- pwm_vals[i] = 0;
- pwmled_mode[i] = 0;
- pwmled_mode_set[i] = 0;
- }
-
- for (i = 0; i < N_PWMLEDS; i++) {
- start_probing(i);
- }
-}
-
-unsigned char pwmled_needs_adc(unsigned char n)
-{
- unsigned char st = pwmled_state[n];
- if (st == ST_PROBING || st == ST_ON)
- return 1;
- else
- return 0;
-}
-
-unsigned char pwmled_enabled(unsigned char n)
-{
- unsigned char st = pwmled_state[n];
- if (st == ST_OFF || st == ST_ON)
- return 1;
- else
- return 0;
-}
-
-void pwmled_set_mode(unsigned char n, unsigned char mode)
-{
- if (!pwmled_enabled(n))
- return;
-
-#if 0
- log_byte(0xF8);
- log_byte(n);
- log_byte(mode);
-#endif
-
- if (mode == 0) {
- pwm_off(n);
- pwmled_state[n] = ST_OFF;
- return;
- }
-
- if (mode <= N_PWMLED_MODES) {
- unsigned char pwmval;
- mode--;
- pwmval = pwm_vals[n*N_PWMLED_MODES+mode];
- pwm_set(n, pwmval);
- pwm_on(n);
-#if 0
- log_byte(pwmval);
-#endif
- pwmled_state[n] = ST_ON;
- pwmled_mode[n] = mode;
- pwmled_mode_set[n] = 1;
- }
-}
-
-static void inline probing_adc(unsigned char n, uint16_t adcval)
-{
- unsigned char need_bigger = 0, i;
- unsigned char *pwm_p = &pwm_vals[n*N_PWMLED_MODES];
- unsigned char *adc_p = &adc_vals[n*N_PWMLED_MODES];
- unsigned char pwm = pwm_probes[n];
-
-#if 0
- log_byte(0xF4);
- log_byte(n);
- log_word(adcval);
-#endif
-
- if (adcval > 0x100 // Too high
- || (pwm == 0 && adcval > 0) // non-zero voltage with zero PWM
- ) {
- pwm_off(n);
- pwmled_state[n] = ST_DISABLED;
- log_byte(0xF0);
- log_byte(n);
- log_word(adcval);
- return;
- }
-
- for (i = 0; i < N_PWMLED_MODES; i++, pwm_p++, adc_p++) {
- uint16_t adc = *adc_p;
- if (adc >= adcval) {
- *pwm_p = pwm;
- need_bigger = 1;
- }
- }
-
-#if 0
- if ((n == 1 && pwm > 0x35) || adcval != 0) {
- log_byte(n);
- log_byte(0xF3);
- log_byte(pwm);
- log_word(adcval);
- }
-#endif
-
- if (!need_bigger) { // successfully probed
- pwm_off(n);
- // pwm_set(n, 0);
- pwmled_state[n] = ST_OFF;
- log_byte(0xF1);
- log_byte(n);
-
- return;
- }
-
- if (pwm >= 0x70) { // over the maximum!
- pwm_off(n);
- pwmled_state[n] = ST_DISABLED;
- log_byte(0xF2);
- log_byte(n);
- // pwm_set(n, 0);
- return;
- }
-
- // try to increase
- pwm++;
- pwm_probes[n] = pwm;
- pwm_set(n, pwm);
-}
-
-// Feedback loop
-static void inline on_adc(unsigned char n, uint16_t adcval)
-{
- unsigned char mode = pwmled_mode[n];
- uint16_t adc_exp = adc_vals[n*N_PWMLED_MODES+mode];
- unsigned char *pwm_p = &pwm_vals[n*N_PWMLED_MODES+mode];
- uint16_t old_pwm = *pwm_p;
- uint16_t new_pwm = old_pwm;
-
-#if 0
- log_byte(0xF5);
- log_byte(n);
- log_word(adcval);
-#endif
-
- if (pwmled_mode_set[n]) { // ignore the first reading
- pwmled_mode_set[n] = 0;
- return;
- }
-
- // FIXME: running average?
- if (2*adcval > 5*adc_exp) { // >2.5x expected, lower significantly
- new_pwm = 2*old_pwm/3;
- } else if (3*adcval > 4*adc_exp) { // >1.33x expected, lower a bit
- new_pwm = old_pwm - 1;
- } else if (4*adcval < 3*adc_exp) { // 0.75x expected, raise a bit
- new_pwm = old_pwm + 1;
- }
-
- // FIXME: better disconnect detection
- if (new_pwm > 0x60) { // disconnected?
- new_pwm = 0x60;
- }
- if (new_pwm < 2) { // short-circuit?
- new_pwm = 2;
- }
-
- if (new_pwm != old_pwm) {
- *pwm_p = new_pwm;
- pwm_set(n, new_pwm);
-#if 0
- log_byte(0xF9);
- log_byte(new_pwm);
-#endif
- }
-}
-
-void pwmled_adc(unsigned char n, uint16_t adcval)
-{
- unsigned char i, probing;
- switch (pwmled_state[n]) {
- case ST_PROBING:
- probing_adc(n, adcval);
-
-#if 1
- probing = 0;
- for (i = 0; i < N_PWMLEDS; i++)
- if (pwmled_state[i] == ST_PROBING)
- probing = 1;
-
- if (!probing) {
- for (i = 0; i < N_PWMLEDS; i++)
- log_byte(pwmled_state[i]);
-
- for (i = 0; i < N_PWMLEDS*N_PWMLED_MODES; i++)
- log_byte(pwm_vals[i]);
- log_flush();
- log_set_state(4);
- }
-#endif
-
- return;
- case ST_ON:
- on_adc(n, adcval);
- return;
- // WTF am I doing in this function then? Maybe recently switched off?
- }
-}
https://www.fi.muni.cz/~kas/git / bike-lights.git / blobdiff