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_vals[N_PWMLEDS*N_PWMLED_MODES] = {
48 MA_GAIN_TO_ADC( 50, 20),
49 MA_GAIN_TO_ADC( 100, 20),
50 MA_GAIN_TO_ADC( 200, 20),
51 MA_GAIN_TO_ADC( 300, 20),
53 MA_GAIN_TO_ADC( 5, 20),
54 MA_GAIN_TO_ADC( 10, 20),
55 MA_GAIN_TO_ADC( 15, 20),
56 MA_GAIN_TO_ADC( 20, 20),
58 MA_GAIN_TO_ADC( 50, 1),
59 MA_GAIN_TO_ADC( 100, 1),
60 MA_GAIN_TO_ADC( 150, 1),
61 MA_GAIN_TO_ADC( 200, 1)
64 MA_GAIN_TO_ADC( 100, 20),
65 MA_GAIN_TO_ADC( 300, 20),
66 MA_GAIN_TO_ADC( 700, 20),
67 MA_GAIN_TO_ADC( 800, 20),
69 MA_GAIN_TO_ADC( 5, 20),
70 MA_GAIN_TO_ADC( 10, 20),
71 MA_GAIN_TO_ADC( 18, 20),
72 MA_GAIN_TO_ADC( 23, 20),
74 MA_GAIN_TO_ADC( 200, 1),
75 MA_GAIN_TO_ADC( 400, 1),
76 MA_GAIN_TO_ADC( 800, 1),
77 MA_GAIN_TO_ADC(1500, 1)
85 // The above are constructed so that the following work:
86 #define ST_IS_ON(s) ((s) & 0x02)
87 #define ST_CAN_SET_MODE(s) ((s) & 0x01)
93 for (i = 0; i < N_PWMLEDS; i++) {
94 pwmled_t *led = pwmleds + i;
96 led->target = adc_vals[i*N_PWMLED_MODES];
99 led->state = ST_PROBING;
100 led->probe_steady = 0;
102 for (j = 0; j < N_PWMLED_MODES; j++) {
103 led->mode_pwm[j] = 0;
104 led->err_sums[j] = 0;
109 void pwmled_set_mode(unsigned char n, unsigned char mode)
111 pwmled_t *led = pwmleds + n;
113 if (!ST_CAN_SET_MODE(led->state))
116 if (led->mode) { // save the previous state
117 led->mode_pwm[led->mode - 1] = led->pwm;
118 led->err_sums[led->mode - 1] = led->err_sum;
123 if (mode > 0 && mode <= N_PWMLED_MODES) {
124 led->target = adc_vals[n*N_PWMLED_MODES + mode - 1];
126 led->pwm = led->mode_pwm[mode - 1];
127 led->err_sum = led->err_sums[mode - 1];
128 led->mode_changed = 1;
129 pwm_set(n, led->pwm);
136 #define PWMLED_PROBE_STEADY_COUNT 10
138 static inline unsigned char pwmled_probed_ok(unsigned char n, uint16_t old_pwm)
140 pwmled_t *led = pwmleds + n;
142 if (led->pwm == old_pwm) {
143 if (led->probe_steady < PWMLED_PROBE_STEADY_COUNT)
146 led->probe_steady = 0;
149 if (led->probe_steady < PWMLED_PROBE_STEADY_COUNT
150 && old_pwm <= led->pwm)
154 led->mode_pwm[led->mode - 1] = led->pwm;
155 led->err_sums[led->mode - 1] = 0;
157 // next mode to probe?
158 if (led->mode < N_PWMLED_MODES) {
159 led->probe_steady = 0;
163 led->target = adc_vals[n*N_PWMLED_MODES+led->mode-1];
176 for (i = 0; i < N_PWMLED_MODES; i++)
177 log_word(led->mode_pwm[i]);
187 static inline void pwmled_err(unsigned char n)
189 pwmleds[n].state = ST_DISABLED;
199 void pwmled_adc(unsigned char n, uint16_t adcval)
201 pwmled_t *led = pwmleds + n;
206 if (!ST_IS_ON(led->state))
209 if (led->state == ST_ON && led->mode_changed) {
213 // FIXME: test for maximum adcval value (adc_max[n])
217 shift = led->state == ST_PROBING ? 3 : 5;
219 sum = ((int32_t)led->pwm << shift)
220 + led->err_sum + led->target - adcval;
225 led->pwm = sum >> shift;
226 sum -= led->pwm << shift;
229 if (led->pwm >= PWM_MAX
230 || (n == 1 && led->pwm > PWM_MAX/4 && adcval < 0x08)) {
235 if (led->state == ST_PROBING)
236 if (pwmled_probed_ok(n, old_pwm))
239 if (led->pwm == old_pwm)
242 pwm_set(n, led->pwm);