8 unsigned char mode, state;
10 unsigned char probe_steady, mode_changed;
12 uint16_t mode_pwm[N_PWMLED_MODES];
13 int16_t err_sums[N_PWMLED_MODES];
16 pwmled_t pwmleds[N_PWMLEDS];
18 #define PWMLED2_TESTING_WITH_350MA_LED
20 #define SENSE_MOHM 33 /* 0.033 Ohm */
22 * Voltage in uV at ADC reading == 1 is 1100/gain/1024
23 * ADC module returns sum of 1 << PWMLED_ADC_SHIFT measurements
24 * Voltage in uV measured is current in mA * sense resistance in mOhm
26 #define MA_GAIN_TO_ADC(ma, gain) ((uint16_t) \
29 * (1 << (PWMLED_ADC_SHIFT)) \
33 static uint16_t adc_max[N_PWMLEDS] = {
35 MA_GAIN_TO_ADC( 400, 20),
36 MA_GAIN_TO_ADC( 30, 20),
37 MA_GAIN_TO_ADC( 800, 1)
39 MA_GAIN_TO_ADC( 900, 20),
40 MA_GAIN_TO_ADC( 30, 20),
41 MA_GAIN_TO_ADC(2500, 1)
45 static uint16_t adc_targets_0[] = {
46 MA_GAIN_TO_ADC( 50, 20),
47 MA_GAIN_TO_ADC( 100, 20),
48 MA_GAIN_TO_ADC( 200, 20),
49 MA_GAIN_TO_ADC( 350, 20),
52 static uint16_t adc_targets_1[] = {
53 MA_GAIN_TO_ADC( 5, 20),
54 MA_GAIN_TO_ADC( 10, 20),
55 MA_GAIN_TO_ADC( 20, 20),
58 static uint16_t adc_targets_2[] = {
59 MA_GAIN_TO_ADC( 50, 1),
60 MA_GAIN_TO_ADC( 100, 1),
61 MA_GAIN_TO_ADC( 200, 1),
62 MA_GAIN_TO_ADC( 350, 1),
65 static uint16_t adc_vals[N_PWMLEDS*N_PWMLED_MODES];
71 // The above are constructed so that the following work:
72 #define ST_IS_ON(s) ((s) & 0x02)
73 #define ST_CAN_SET_MODE(s) ((s) & 0x01)
79 for (i = 0; i < N_PWMLEDS; i++) {
80 pwmled_t *led = pwmleds + i;
82 led->target = adc_vals[i*N_PWMLED_MODES];
84 led->probe_steady = 0;
89 for (j = 0; j < N_PWMLED_MODES; j++) {
95 pwmled_set_brightness(PWMLED_BRIGHTNESS(0, 2, 1, 0, 2));
98 void pwmled_set_mode(unsigned char n, unsigned char mode)
100 pwmled_t *led = pwmleds + n;
102 if (!ST_CAN_SET_MODE(led->state))
105 if (led->mode) { // save the previous state
106 led->mode_pwm[led->mode - 1] = led->pwm;
107 led->err_sums[led->mode - 1] = led->err_sum;
112 if (mode > 0 && mode <= N_PWMLED_MODES) {
113 led->target = adc_vals[n*N_PWMLED_MODES + mode - 1];
115 led->pwm = led->mode_pwm[mode - 1];
116 led->err_sum = led->err_sums[mode - 1];
117 led->mode_changed = 1;
118 pwm_set(n, led->pwm);
125 void pwmled_set_brightness(uint16_t brightness)
129 adc_vals[0] = adc_targets_0[brightness & 0x7];
130 adc_vals[1] = adc_targets_0[(brightness >> 3) & 0x7];
131 adc_vals[2] = adc_vals[1];
133 adc_vals[3] = adc_targets_1[(brightness >> 6) & 0x7];
134 adc_vals[4] = adc_vals[3];
135 adc_vals[5] = adc_vals[3];
137 adc_vals[6] = adc_targets_2[(brightness >> 9) & 0x7];
138 adc_vals[7] = adc_targets_2[(brightness >> 12) & 0x7];
139 adc_vals[8] = adc_vals[7];
141 for (i = 0; i < N_PWMLEDS; i++) {
142 pwmleds[i].err_sum = 0;
143 pwmled_set_mode(i, pwmleds[i].mode);
147 #define PWMLED_PROBE_STEADY_COUNT 10
149 static inline unsigned char pwmled_probed_ok(unsigned char n, uint16_t old_pwm)
151 pwmled_t *led = pwmleds + n;
153 if (led->pwm == old_pwm) {
154 if (led->probe_steady < PWMLED_PROBE_STEADY_COUNT)
157 led->probe_steady = 0;
160 if (led->probe_steady < PWMLED_PROBE_STEADY_COUNT
161 && old_pwm <= led->pwm)
165 led->mode_pwm[led->mode - 1] = led->pwm;
166 led->err_sums[led->mode - 1] = 0;
168 // next mode to probe?
169 if (led->mode < N_PWMLED_MODES) {
170 led->probe_steady = 0;
174 led->target = adc_vals[n*N_PWMLED_MODES+led->mode-1];
187 for (i = 0; i < N_PWMLED_MODES; i++)
188 log_word(led->mode_pwm[i]);
198 static inline void pwmled_err(unsigned char n)
200 pwmleds[n].state = ST_DISABLED;
210 void pwmled_adc(unsigned char n, uint16_t adcval)
212 pwmled_t *led = pwmleds + n;
217 if (!ST_IS_ON(led->state))
220 if (led->state == ST_ON && led->mode_changed) {
224 // FIXME: test for maximum adcval value (adc_max[n])
228 // shift = led->state == ST_PROBING ? 3 : 8;
231 sum = ((int32_t)led->pwm << shift)
232 + led->err_sum + led->target - adcval;
237 led->pwm = sum >> shift;
238 sum -= led->pwm << shift;
241 if (led->pwm >= PWM_MAX
242 || (n == 1 && led->pwm > PWM_MAX/2 && adcval < 0x08)) {
247 if (led->state == ST_PROBING)
248 if (pwmled_probed_ok(n, old_pwm))
251 if (led->pwm == old_pwm)
254 pwm_set(n, led->pwm);