--- /dev/null
+#include <avr/io.h>
+
+#include "lights.h"
+
+typedef struct {
+ uint16_t target, pwm;
+ int16_t err_sum;
+ unsigned char mode, state;
+ union {
+ unsigned char probe_steady, mode_changed;
+ };
+ uint16_t mode_pwm[N_PWMLED_MODES];
+ int16_t err_sums[N_PWMLED_MODES];
+} pwmled_t;
+
+pwmled_t pwmleds[N_PWMLEDS];
+
+#define PWMLED2_TESTING_WITH_350MA_LED
+
+#define SENSE_MOHM 33 /* 0.033 Ohm */
+/*
+ * Voltage in uV at ADC reading == 1 is 1100/gain/1024
+ * ADC module returns sum of 1 << PWMLED_ADC_SHIFT measurements
+ * Voltage in uV measured is current in mA * sense resistance in mOhm
+ */
+#define MA_GAIN_TO_ADC(ma, gain) ((uint16_t) \
+ ((uint32_t)(ma) \
+ * (SENSE_MOHM) \
+ * (1 << (PWMLED_ADC_SHIFT)) \
+ * 1024 \
+ / (1100000/(gain))))
+
+static uint16_t adc_max[N_PWMLEDS] = {
+#ifdef TESTING_FW
+ MA_GAIN_TO_ADC( 400, 20),
+ MA_GAIN_TO_ADC( 30, 20),
+ MA_GAIN_TO_ADC( 800, 1)
+#else
+ MA_GAIN_TO_ADC( 900, 20),
+ MA_GAIN_TO_ADC( 30, 20),
+ MA_GAIN_TO_ADC(2500, 1)
+#endif
+};
+
+static uint16_t adc_vals[N_PWMLEDS*N_PWMLED_MODES] = {
+#ifdef TESTING_FW
+ /* pwmled0 */
+ MA_GAIN_TO_ADC( 50, 20),
+ MA_GAIN_TO_ADC( 100, 20),
+ MA_GAIN_TO_ADC( 200, 20),
+ MA_GAIN_TO_ADC( 350, 20),
+ /* pwmled1 */
+ MA_GAIN_TO_ADC( 5, 20),
+ MA_GAIN_TO_ADC( 10, 20),
+ MA_GAIN_TO_ADC( 15, 20),
+ MA_GAIN_TO_ADC( 20, 20),
+ /* pwmled2 */
+ MA_GAIN_TO_ADC( 50, 1),
+ MA_GAIN_TO_ADC( 80, 1),
+ MA_GAIN_TO_ADC( 150, 1),
+ MA_GAIN_TO_ADC( 200, 1)
+#else
+ /* pwmled0 */
+ MA_GAIN_TO_ADC( 50, 20),
+ MA_GAIN_TO_ADC( 100, 20),
+ MA_GAIN_TO_ADC( 200, 20),
+ MA_GAIN_TO_ADC( 350, 20),
+ /* pwmled1 */
+ MA_GAIN_TO_ADC( 5, 20),
+ MA_GAIN_TO_ADC( 10, 20),
+ MA_GAIN_TO_ADC( 18, 20),
+ MA_GAIN_TO_ADC( 23, 20),
+ /* pwmled2 */
+ MA_GAIN_TO_ADC( 150, 1),
+ MA_GAIN_TO_ADC( 300, 1),
+ MA_GAIN_TO_ADC( 800, 1),
+ MA_GAIN_TO_ADC(1500, 1)
+#endif
+};
+
+#define ST_DISABLED 0
+#define ST_OFF 1
+#define ST_PROBING 2
+#define ST_ON 3
+// The above are constructed so that the following work:
+#define ST_IS_ON(s) ((s) & 0x02)
+#define ST_CAN_SET_MODE(s) ((s) & 0x01)
+
+void init_pwmled()
+{
+ unsigned char i, j;
+
+ for (i = 0; i < N_PWMLEDS; i++) {
+ pwmled_t *led = pwmleds + i;
+ led->err_sum = 0;
+ led->target = adc_vals[i*N_PWMLED_MODES];
+ led->pwm = 0;
+ led->mode = 1;
+ led->state = ST_PROBING;
+ led->probe_steady = 0;
+
+ for (j = 0; j < N_PWMLED_MODES; j++) {
+ led->mode_pwm[j] = 0;
+ led->err_sums[j] = 0;
+ }
+ }
+}
+
+void pwmled_set_mode(unsigned char n, unsigned char mode)
+{
+ pwmled_t *led = pwmleds + n;
+
+ if (!ST_CAN_SET_MODE(led->state))
+ return;
+
+ if (led->mode) { // save the previous state
+ led->mode_pwm[led->mode - 1] = led->pwm;
+ led->err_sums[led->mode - 1] = led->err_sum;
+ }
+
+ led->mode = mode;
+
+ if (mode > 0 && mode <= N_PWMLED_MODES) {
+ led->target = adc_vals[n*N_PWMLED_MODES + mode - 1];
+ led->state = ST_ON;
+ led->pwm = led->mode_pwm[mode - 1];
+ led->err_sum = led->err_sums[mode - 1];
+ led->mode_changed = 1;
+ pwm_set(n, led->pwm);
+ } else {
+ led->state = ST_OFF;
+ pwm_off(n);
+ }
+}
+
+#define PWMLED_PROBE_STEADY_COUNT 10
+
+static inline unsigned char pwmled_probed_ok(unsigned char n, uint16_t old_pwm)
+{
+ pwmled_t *led = pwmleds + n;
+
+ if (led->pwm == old_pwm) {
+ if (led->probe_steady < PWMLED_PROBE_STEADY_COUNT)
+ led->probe_steady++;
+ } else {
+ led->probe_steady = 0;
+ }
+
+ if (led->probe_steady < PWMLED_PROBE_STEADY_COUNT
+ && old_pwm <= led->pwm)
+ return 0;
+
+ // probed OK
+ led->mode_pwm[led->mode - 1] = led->pwm;
+ led->err_sums[led->mode - 1] = 0;
+
+ // next mode to probe?
+ if (led->mode < N_PWMLED_MODES) {
+ led->probe_steady = 0;
+ led->err_sum = 0;
+
+ led->mode++;
+ led->target = adc_vals[n*N_PWMLED_MODES+led->mode-1];
+
+ return 0;
+ } else {
+ unsigned char i;
+
+ led->state = ST_OFF;
+ pwm_off(n);
+
+ log_byte(0xF0);
+ log_byte(n);
+ log_word(jiffies);
+
+ for (i = 0; i < N_PWMLED_MODES; i++)
+ log_word(led->mode_pwm[i]);
+
+ log_flush();
+
+ pattern_reload();
+
+ return 1;
+ }
+}
+
+static inline void pwmled_err(unsigned char n)
+{
+ pwmleds[n].state = ST_DISABLED;
+ pwm_off(n);
+
+ log_byte(0xF1);
+ log_byte(n);
+ log_word(jiffies);
+ log_flush();
+}
+
+
+void pwmled_adc(unsigned char n, uint16_t adcval)
+{
+ pwmled_t *led = pwmleds + n;
+ uint16_t old_pwm;
+ int32_t sum;
+ unsigned char shift;
+
+ if (!ST_IS_ON(led->state))
+ return;
+
+ if (led->state == ST_ON && led->mode_changed) {
+ led->mode_changed--;
+ return;
+ }
+ // FIXME: test for maximum adcval value (adc_max[n])
+
+ old_pwm = led->pwm;
+
+ shift = led->state == ST_PROBING ? 3 : 8;
+
+ sum = ((int32_t)led->pwm << shift)
+ + led->err_sum + led->target - adcval;
+
+ if (sum < 0)
+ sum = 0;
+
+ led->pwm = sum >> shift;
+ sum -= led->pwm << shift;
+ led->err_sum = sum;
+
+ if (led->pwm >= PWM_MAX
+ || (n == 1 && led->pwm > PWM_MAX/2 && adcval < 0x08)) {
+ pwmled_err(n);
+ return;
+ }
+
+ if (led->state == ST_PROBING)
+ if (pwmled_probed_ok(n, old_pwm))
+ return;
+
+ if (led->pwm == old_pwm)
+ return;
+
+ pwm_set(n, led->pwm);
+}
+
https://www.fi.muni.cz/~kas/git / tinyboard.git / blobdiff