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( 350, 20),
52 MA_GAIN_TO_ADC( 5, 20),
53 MA_GAIN_TO_ADC( 10, 20),
54 MA_GAIN_TO_ADC( 20, 20),
56 MA_GAIN_TO_ADC( 50, 1),
57 MA_GAIN_TO_ADC( 80, 1),
58 MA_GAIN_TO_ADC( 150, 1)
61 MA_GAIN_TO_ADC( 50, 20),
62 MA_GAIN_TO_ADC( 100, 20),
63 MA_GAIN_TO_ADC( 350, 20),
65 MA_GAIN_TO_ADC( 5, 20),
66 MA_GAIN_TO_ADC( 10, 20),
67 MA_GAIN_TO_ADC( 23, 20),
69 MA_GAIN_TO_ADC( 150, 1),
70 MA_GAIN_TO_ADC( 300, 1),
71 MA_GAIN_TO_ADC(1500, 1)
79 // The above are constructed so that the following work:
80 #define ST_IS_ON(s) ((s) & 0x02)
81 #define ST_CAN_SET_MODE(s) ((s) & 0x01)
87 for (i = 0; i < N_PWMLEDS; i++) {
88 pwmled_t *led = pwmleds + i;
90 led->target = adc_vals[i*N_PWMLED_MODES];
92 led->probe_steady = 0;
93 led->state = ST_PROBING;
97 for (j = 0; j < N_PWMLED_MODES; j++) {
104 void pwmled_set_mode(unsigned char n, unsigned char mode)
106 pwmled_t *led = pwmleds + n;
108 if (!ST_CAN_SET_MODE(led->state))
111 if (led->mode) { // save the previous state
112 led->mode_pwm[led->mode - 1] = led->pwm;
113 led->err_sums[led->mode - 1] = led->err_sum;
118 if (mode > 0 && mode <= N_PWMLED_MODES) {
119 led->target = adc_vals[n*N_PWMLED_MODES + mode - 1];
121 led->pwm = led->mode_pwm[mode - 1];
122 led->err_sum = led->err_sums[mode - 1];
123 led->mode_changed = 1;
124 pwm_set(n, led->pwm);
131 #define PWMLED_PROBE_STEADY_COUNT 10
133 static inline unsigned char pwmled_probed_ok(unsigned char n, uint16_t old_pwm)
135 pwmled_t *led = pwmleds + n;
137 if (led->pwm == old_pwm) {
138 if (led->probe_steady < PWMLED_PROBE_STEADY_COUNT)
141 led->probe_steady = 0;
144 if (led->probe_steady < PWMLED_PROBE_STEADY_COUNT
145 && old_pwm <= led->pwm)
149 led->mode_pwm[led->mode - 1] = led->pwm;
150 led->err_sums[led->mode - 1] = 0;
152 // next mode to probe?
153 if (led->mode < N_PWMLED_MODES) {
154 led->probe_steady = 0;
158 led->target = adc_vals[n*N_PWMLED_MODES+led->mode-1];
171 for (i = 0; i < N_PWMLED_MODES; i++)
172 log_word(led->mode_pwm[i]);
182 static inline void pwmled_err(unsigned char n)
184 pwmleds[n].state = ST_DISABLED;
194 void pwmled_adc(unsigned char n, uint16_t adcval)
196 pwmled_t *led = pwmleds + n;
201 if (!ST_IS_ON(led->state))
204 if (led->state == ST_ON && led->mode_changed) {
208 // FIXME: test for maximum adcval value (adc_max[n])
212 shift = led->state == ST_PROBING ? 3 : 8;
214 sum = ((int32_t)led->pwm << shift)
215 + led->err_sum + led->target - adcval;
220 led->pwm = sum >> shift;
221 sum -= led->pwm << shift;
224 if (led->pwm >= PWM_MAX
225 || (n == 1 && led->pwm > PWM_MAX/2 && adcval < 0x08)) {
230 if (led->state == ST_PROBING)
231 if (pwmled_probed_ok(n, old_pwm))
234 if (led->pwm == old_pwm)
237 pwm_set(n, led->pwm);