From: Jan "Yenya" Kasprzak <kas@fi.muni.cz>
Date: Fri, 14 Sep 2012 20:51:12 +0000 (+0200)
Subject: pwm: 16-bit pwm and adc values
X-Git-Tag: gerber-fab-20121029-1711~37
X-Git-Url: https://www.fi.muni.cz/~kas/git//home/kas/public_html/git/?a=commitdiff_plain;h=38a3c5783c24a17e6cf1fbf0af40ae1dec805419;p=bike-lights.git

pwm: 16-bit pwm and adc values
---

diff --git a/firmware/lights.h b/firmware/lights.h
index bce5215..c0daaef 100644
--- a/firmware/lights.h
+++ b/firmware/lights.h
@@ -29,7 +29,7 @@ void timer_start_adcs();
 /* pwm.c */
 void init_pwm();
 void pwm_off(unsigned char n);
-void pwm_set(unsigned char n, unsigned char stride);
+void pwm_set(unsigned char n, uint16_t stride);
 
 /* tmr.c */
 extern volatile uint16_t jiffies;
diff --git a/firmware/pwm.c b/firmware/pwm.c
index 4eb2f83..10c03ba 100644
--- a/firmware/pwm.c
+++ b/firmware/pwm.c
@@ -4,7 +4,7 @@
 
 #include "lights.h"
 
-#define PWM_MAX 0x0FF
+#define PWM_MAX 0x1FF
 
 void init_pwm()
 {
@@ -23,10 +23,11 @@ void init_pwm()
 	TCCR1A = _BV(COM1A1) | _BV(COM1B1) | _BV(PWM1A) | _BV(PWM1B);
 	TCCR1D = 0;
 	TCCR1B = _BV(CS10); 			// no clock prescaling
+
 	TC1H = PWM_MAX >> 8;
 	OCR1C = PWM_MAX & 0xFF;				// TOP value
 
-	TC1H = PWM_MAX >> 8;
+	TC1H = PWM_MAX >> 8;		// PWM3 is inverted
 	OCR1D = PWM_MAX & 0xFF;
 
 	TC1H = 0x00;
@@ -45,26 +46,34 @@ void pwm_off(unsigned char n)
 	}
 }
 
-void pwm_set(unsigned char n, unsigned char stride)
+void pwm_set(unsigned char n, uint16_t stride)
 {
-	TC1H = 0x00;
+	unsigned char hi, lo;
+
+	if (stride > PWM_MAX)
+		stride = PWM_MAX;
+
+	if (n == 2)
+		stride = PWM_MAX - stride;
+
+	hi = stride >> 8;
+	lo = stride & 0xFF;
+
 	switch (n) {
 	case 0:
-		OCR1A = stride;
+		TC1H = hi;
+		OCR1A = lo;
 		DDRB |= _BV(PB1);
 		break;
-	case 1: OCR1B = stride;
+	case 1:
+		TC1H = hi;
+		OCR1B = lo;
 		DDRB |= _BV(PB3);
 		break;
-	case 2: {
-			uint16_t s16 = PWM_MAX - (uint16_t)stride;
-			volatile unsigned char hi, lo;
-			hi = s16 >> 8;
-			lo = s16 & 0xFF;
-			TC1H = hi;
-			OCR1D = lo;
-			DDRB |= _BV(PB5);
-		}
+	case 2:
+		TC1H = hi;
+		OCR1D = lo;
+		DDRB |= _BV(PB5);
 		break;
 	}
 }
diff --git a/firmware/pwmled.c b/firmware/pwmled.c
index 7985467..06c6b11 100644
--- a/firmware/pwmled.c
+++ b/firmware/pwmled.c
@@ -2,8 +2,10 @@
 
 #include "lights.h"
 
-static unsigned char pwm_vals[N_PWMLEDS*N_PWMLED_MODES];
-static unsigned char adc_vals[N_PWMLEDS*N_PWMLED_MODES] = {
+static uint16_t pwm_vals[N_PWMLEDS*N_PWMLED_MODES];
+static uint16_t pwm_max[N_PWMLEDS] = { 0x70, 0x70, 0xF0 };
+static uint16_t adc_max[N_PWMLEDS] = { 0x70, 0x70, 0xF0 };
+static uint16_t adc_vals[N_PWMLEDS*N_PWMLED_MODES] = {
 	/* pwmled0 */
 	0x04, 0x14, 0x24, 0x38,
 	/* pwmled1 */
@@ -22,7 +24,7 @@ static unsigned char pwmled_state[N_PWMLEDS];
 static unsigned char pwmled_mode[N_PWMLEDS];
 static unsigned char pwmled_mode_set[N_PWMLEDS];
 
-static unsigned char pwm_probes[N_PWMLEDS];
+static uint16_t pwm_probes[N_PWMLEDS];
 
 static void start_probing(unsigned char n)
 {
@@ -82,7 +84,7 @@ void pwmled_set_mode(unsigned char n, unsigned char mode)
 	}
 
 	if (mode <= N_PWMLED_MODES) {
-		unsigned char pwmval;
+		uint16_t pwmval;
 		mode--;
 		pwmval = pwm_vals[n*N_PWMLED_MODES+mode];
 		pwm_set(n, pwmval);
@@ -98,9 +100,9 @@ void pwmled_set_mode(unsigned char n, unsigned char mode)
 static void inline probing_adc(unsigned char n, uint16_t adcval)
 {
 	unsigned char need_bigger = 0, i;
-	unsigned char *pwm_p = &pwm_vals[n*N_PWMLED_MODES];
-	unsigned char *adc_p = &adc_vals[n*N_PWMLED_MODES];
-	unsigned char pwm = pwm_probes[n];
+	uint16_t *pwm_p = &pwm_vals[n*N_PWMLED_MODES];
+	uint16_t *adc_p = &adc_vals[n*N_PWMLED_MODES];
+	uint16_t pwm = pwm_probes[n];
 
 #if 0
 	log_byte(0xF4);
@@ -108,7 +110,7 @@ static void inline probing_adc(unsigned char n, uint16_t adcval)
 	log_word(adcval);
 #endif
 
-	if (adcval > 0x100 // Too high
+	if (adcval > adc_max[n] // Too high
 		|| (pwm == 0 && adcval > 0) // non-zero voltage with zero PWM
 		) {
 		pwm_off(n);
@@ -146,7 +148,7 @@ static void inline probing_adc(unsigned char n, uint16_t adcval)
 		return;
 	}
 
-	if (pwm >= 0xE0) { // over the maximum!
+	if (pwm >= pwm_max[n]) { // over the maximum!
 		pwm_off(n);
 		pwmled_state[n] = ST_DISABLED;
 		log_byte(0xF2);
@@ -166,7 +168,7 @@ static void inline on_adc(unsigned char n, uint16_t adcval)
 {
 	unsigned char mode = pwmled_mode[n];
 	uint16_t adc_exp     =  adc_vals[n*N_PWMLED_MODES+mode];
-	unsigned char *pwm_p = &pwm_vals[n*N_PWMLED_MODES+mode];
+	uint16_t *pwm_p      = &pwm_vals[n*N_PWMLED_MODES+mode];
 	uint16_t old_pwm     = *pwm_p;
 	uint16_t new_pwm = old_pwm;
 
@@ -191,8 +193,8 @@ static void inline on_adc(unsigned char n, uint16_t adcval)
 	}
 
 	// FIXME: better disconnect detection
-	if (new_pwm > 0xE0) { // disconnected?
-		new_pwm = 0xE0;
+	if (new_pwm > pwm_max[n]) { // FIXME: disconnected?
+		new_pwm = pwm_max[n];
 	}
 	if (new_pwm < 2) { // short-circuit?
 		new_pwm = 2;
@@ -226,7 +228,7 @@ void pwmled_adc(unsigned char n, uint16_t adcval)
 				log_byte(pwmled_state[i]);
 				
 			for (i = 0; i < N_PWMLEDS*N_PWMLED_MODES; i++)
-				log_byte(pwm_vals[i]);
+				log_word(pwm_vals[i]);
 			log_flush();
 			log_set_state(4);
 		}