5 static uint16_t pwm_vals[N_PWMLEDS*N_PWMLED_MODES];
6 static uint16_t pwm_max[N_PWMLEDS] = {
8 PWM_MAX - (PWM_MAX >> 4), // step-up
12 #define PWMLED2_TESTING_WITH_350MA_LED
14 #define SENSE_MOHM 33 /* 0.033 Ohm */
15 #define MA_MOHM_GAIN_TO_ADC(ma, mohm, gain) (\
16 ((unsigned long)(ma))*(mohm) /* voltage at sensing resistor in uV */ \
17 /(1100000UL/gain/1024UL) /* voltage of ADC reading == 1 */ \
19 static uint16_t adc_max[N_PWMLEDS] = {
20 MA_MOHM_GAIN_TO_ADC( 400, SENSE_MOHM, 20),
21 MA_MOHM_GAIN_TO_ADC( 30, SENSE_MOHM, 20),
22 #ifdef PWMLED2_TESTING_WITH_350MA_LED
23 MA_MOHM_GAIN_TO_ADC( 400, SENSE_MOHM, 1)
25 MA_MOHM_GAIN_TO_ADC(2500, SENSE_MOHM, 1)
28 static uint16_t adc_vals[N_PWMLEDS*N_PWMLED_MODES] = {
30 MA_MOHM_GAIN_TO_ADC( 20, SENSE_MOHM, 20),
31 MA_MOHM_GAIN_TO_ADC( 50, SENSE_MOHM, 20),
32 MA_MOHM_GAIN_TO_ADC( 100, SENSE_MOHM, 20),
33 MA_MOHM_GAIN_TO_ADC( 350, SENSE_MOHM, 20),
35 MA_MOHM_GAIN_TO_ADC( 5, SENSE_MOHM, 20),
36 MA_MOHM_GAIN_TO_ADC( 12, SENSE_MOHM, 20),
37 MA_MOHM_GAIN_TO_ADC( 16, SENSE_MOHM, 20),
38 MA_MOHM_GAIN_TO_ADC( 20, SENSE_MOHM, 20),
40 #ifdef PWMLED2_TESTING_WITH_350MA_LED
41 MA_MOHM_GAIN_TO_ADC( 100, SENSE_MOHM, 1),
42 MA_MOHM_GAIN_TO_ADC( 140, SENSE_MOHM, 1),
43 MA_MOHM_GAIN_TO_ADC( 250, SENSE_MOHM, 1),
44 MA_MOHM_GAIN_TO_ADC( 350, SENSE_MOHM, 1),
46 MA_MOHM_GAIN_TO_ADC( 150, SENSE_MOHM, 1),
47 MA_MOHM_GAIN_TO_ADC( 350, SENSE_MOHM, 1),
48 MA_MOHM_GAIN_TO_ADC( 700, SENSE_MOHM, 1),
49 MA_MOHM_GAIN_TO_ADC(2400, SENSE_MOHM, 1),
53 // TODO: maybe convert this to bitmask to simplify pwmled_needs_adc() ?
54 static unsigned char pwmled_state[N_PWMLEDS];
60 static unsigned char pwmled_mode[N_PWMLEDS];
61 static unsigned char pwmled_mode_set[N_PWMLEDS];
63 static uint16_t pwm_probes[N_PWMLEDS];
64 static int16_t differences[N_PWMLEDS];
66 static void start_probing(unsigned char n)
68 pwmled_state[n] = ST_PROBING;
77 for (i = 0; i < N_PWMLEDS*N_PWMLED_MODES; i++) {
80 pwmled_mode_set[i] = 0;
83 for (i = 0; i < N_PWMLEDS; i++) {
89 unsigned char pwmled_needs_adc(unsigned char n)
91 unsigned char st = pwmled_state[n];
92 if (st == ST_PROBING || st == ST_ON)
98 unsigned char pwmled_enabled(unsigned char n)
100 unsigned char st = pwmled_state[n];
101 if (st == ST_OFF || st == ST_ON)
107 void pwmled_set_mode(unsigned char n, unsigned char mode)
109 if (!pwmled_enabled(n))
117 if (mode > 0 && mode <= N_PWMLED_MODES) {
120 pwmval = pwm_vals[n*N_PWMLED_MODES+mode];
125 pwmled_state[n] = ST_ON;
126 pwmled_mode[n] = mode;
127 pwmled_mode_set[n] = 1;
131 pwmled_state[n] = ST_OFF;
135 static void inline probing_adc(unsigned char n, uint16_t adcval)
137 unsigned char need_bigger = 0, i;
138 uint16_t *pwm_p = &pwm_vals[n*N_PWMLED_MODES];
139 uint16_t *adc_p = &adc_vals[n*N_PWMLED_MODES];
140 uint16_t pwm = pwm_probes[n];
148 if (adcval > adc_max[n] // Too high
149 || (pwm == 0 && adcval > 0) // non-zero voltage with zero PWM
152 pwmled_state[n] = ST_DISABLED;
159 for (i = 0; i < N_PWMLED_MODES; i++, pwm_p++, adc_p++) {
160 uint16_t adc = *adc_p;
168 if ((n == 1 && pwm > 0x35) || adcval != 0) {
176 if (!need_bigger) { // successfully probed
179 pwmled_state[n] = ST_OFF;
186 if (pwm >= pwm_max[n]) { // over the maximum!
188 pwmled_state[n] = ST_DISABLED;
202 static void inline on_adc(unsigned char n, uint16_t adcval)
204 unsigned char mode = pwmled_mode[n];
205 uint16_t adc_exp = adc_vals[n*N_PWMLED_MODES+mode];
206 uint16_t *pwm_p = &pwm_vals[n*N_PWMLED_MODES+mode];
207 int16_t old_pwm = *pwm_p;
208 int16_t new_pwm = old_pwm;
217 if (pwmled_mode_set[n]) { // ignore the first reading
218 pwmled_mode_set[n] = 0;
222 differences[n] += adcval;
223 differences[n] -= adc_exp;
225 if (differences[n] > 16)
227 else if (differences[n] > 4)
229 else if (differences[n] < -16)
231 else if (differences[n] < -4)
233 // new_pwm -= differences[n] >> 3;
235 if (new_pwm == old_pwm)
240 if (new_pwm > (int16_t)pwm_max[n]) {
241 // FIXME: disconnected?
242 new_pwm = pwm_max[n];
246 // FIXME: short-circuit?
253 if (jiffies > 500 && n == 1) {
254 log_byte(adcval & 0xFF);
259 void pwmled_adc(unsigned char n, uint16_t adcval)
261 unsigned char i, probing;
263 switch (pwmled_state[n]) {
265 probing_adc(n, adcval);
268 for (i = 0; i < N_PWMLEDS; i++)
269 if (pwmled_state[i] == ST_PROBING)
273 for (i = 0; i < N_PWMLEDS; i++)
274 log_byte(pwmled_state[i]);
276 for (i = 0; i < N_PWMLEDS*N_PWMLED_MODES; i++)
277 log_word(pwm_vals[i]);
287 // WTF am I doing in this function then? Maybe recently switched off?