Add pwm led code from sniffonly branch

git-svn-id: https://svn.openpcd.org:2342/trunk@435 6dc7ffe9-61d6-0310-9af1-9938baff3ed1

openpicc/application/gammatable.py

@@ -0,0 +1,13 @@
+#!/usr/bin/env python
+
+a = range(1001)
+
+#b = [ (pow(10, (float(e)/500))) * 202  - 202 for e in a]
+b = [ 65534 * (pow((float(e)/1000), 2)) for e in a]
+maximum = max(b)+1
+
+print "/* Autogenerated from gammatable.py */"
+print "const u_int16_t gammatable[] = {" + ", ".join( [str(int(round(int(e)))) for e in b]  ) + "};"
+print "#define GAMMA_MAX %i" % maximum
+print "#define GAMMA_LEN %i" % len(b)
+

openpicc/application/led.c

@@ -3,6 +3,7 @@
  * OpenBeacon.org - LED support
  *
  * Copyright 2007 Milosch Meriac <meriac@openbeacon.de>
+ * Copyright 2008 Henryk Plötz <henryk@ploetzli.ch>
  *
  ***************************************************************
 
@@ -27,43 +28,102 @@
 #include <board.h>
 #include <task.h>
 #include "led.h"
+
+#include "gammatable.inc"
+
 /**********************************************************************/
 
 #define BLINK_TIME 5
+#define PWM_PERIOD GAMMA_MAX
+const struct channel_definition {
+	int channel_no;
+	enum { PERIPH_NONE=0, PERIPH_A, PERIPH_B} periph;
+	AT91PS_PWMC_CH channel;
+} 
+pwm_channels[] = {
+		[0] =  {0, PERIPH_A,  AT91C_BASE_PWMC_CH0},
+		[1] =  {1, PERIPH_A,  AT91C_BASE_PWMC_CH1},
+		[2] =  {2, PERIPH_A,  AT91C_BASE_PWMC_CH2},
+		[7] =  {3, PERIPH_B,  AT91C_BASE_PWMC_CH3},
+		[11] = {0, PERIPH_B,  AT91C_BASE_PWMC_CH0},
+		[12] = {1, PERIPH_B,  AT91C_BASE_PWMC_CH1},
+		[13] = {2, PERIPH_B,  AT91C_BASE_PWMC_CH2},
+		[14] = {3, PERIPH_B,  AT91C_BASE_PWMC_CH3},
+		[23] = {0, PERIPH_B,  AT91C_BASE_PWMC_CH0},
+		[24] = {1, PERIPH_B,  AT91C_BASE_PWMC_CH1},
+		[25] = {2, PERIPH_B,  AT91C_BASE_PWMC_CH2},
+};
 
-void vLedSetRed(bool_t on)
+static const struct channel_definition* find_channel(unsigned int led)
+{
+	unsigned int pos = ffs(led);
+	if(pos==0) return 0;
+	
+	if(pos-1 >= sizeof(pwm_channels) / sizeof(pwm_channels[0]) ) return 0;
+	if(pwm_channels[pos-1].periph == PERIPH_NONE) return 0;
+	return &pwm_channels[pos-1];
+}
+
+// Brightness is in per thousand
+void vLedSetBrightness(unsigned int led, int brightness)
+{
+	const struct channel_definition *c = find_channel(led);
+	if(c==0) return;
+	
+	if(brightness < 0) brightness = 0;
+	if(brightness > GAMMA_LEN-1) brightness = GAMMA_LEN-1;
+	
+	int duty = gammatable[brightness];
+	if(duty > 1) {
+		c->channel->PWMC_CUPDR = duty;
+		if(c->periph == PERIPH_A) {
+			AT91F_PIO_CfgPeriph(AT91C_BASE_PIOA, led, 0);
+		} else if(c->periph == PERIPH_B) {
+			AT91F_PIO_CfgPeriph(AT91C_BASE_PIOA, 0, led);
+		}
+	} else {
+	    vLedSet(led, 0);
+	}
+}
+
+void vLedSet(int led, bool_t on)
 {
     if(on)
-	AT91F_PIO_ClearOutput( AT91C_BASE_PIOA, LED_RED );
+    	AT91F_PIO_ClearOutput( AT91C_BASE_PIOA, led );
     else
-        AT91F_PIO_SetOutput( AT91C_BASE_PIOA, LED_RED );
+        AT91F_PIO_SetOutput( AT91C_BASE_PIOA, led );
+    AT91F_PIO_CfgOutput( AT91C_BASE_PIOA, led );
 }
+
+void vLedBlink(int led)
+{
+	volatile int i=0;
+	vLedSet(led, 1);
+	for(i=0; i<BLINK_TIME; i++) {vLedSet(led,0);vLedSet(led,1);}
+	vLedSet(led, 0);	
+}
+
 /**********************************************************************/
+void vLedSetRed(bool_t on)
+{
+	vLedSet(LED_RED, on);
+}
 
 void vLedBlinkRed(void)
 {
-	volatile int i=0;
-	vLedSetRed(1);
-	for(i=0; i<BLINK_TIME; i++) {vLedSetRed(0);vLedSetRed(1);}
-	vLedSetRed(0);
+	vLedBlink(LED_RED);
 }
 /**********************************************************************/
 
 void vLedSetGreen(bool_t on)
 {
-    if(on)
-	AT91F_PIO_ClearOutput( AT91C_BASE_PIOA, LED_GREEN );
-    else
-        AT91F_PIO_SetOutput( AT91C_BASE_PIOA, LED_GREEN );
+	vLedSet(LED_GREEN, on);
 }
 /**********************************************************************/
 
 void vLedBlinkGreen(void)
 {
-	volatile int i=0;
-	vLedSetGreen(1);
-	for(i=0; i<BLINK_TIME; i++) {vLedSetGreen(0);vLedSetGreen(1);}
-	vLedSetGreen(0);
+	vLedBlink(LED_GREEN);
 }
 /**********************************************************************/
 
@@ -72,7 +132,7 @@ void vLedHaltBlinking(int reason)
     volatile u_int32_t i=0;
     while(1)
     {
-        AT91F_PIO_ClearOutput( AT91C_BASE_PIOA, LED_MASK );
+        AT91F_PIO_ClearOutput( AT91C_BASE_PIOA, LED_RED | LED_GREEN );
         for(i=0; i<MCK/40; i++) ;
 	
 	switch(reason) {
@@ -96,15 +156,44 @@ void vLedHaltBlinking(int reason)
 	}
         for(i=0; i<MCK/20; i++) ;
 	
-        AT91F_PIO_SetOutput( AT91C_BASE_PIOA, LED_MASK );
+        AT91F_PIO_SetOutput( AT91C_BASE_PIOA, LED_RED | LED_GREEN );
         for(i=0; i<MCK/40; i++) ;
     }
 }
 /**********************************************************************/
 
+static void init_led_pwm(unsigned int led)
+{
+	const struct channel_definition *c = find_channel(led);
+	
+	if(c==0) return;
+	
+	// Set PIO mapping
+	if(c->periph == PERIPH_A) {
+		AT91F_PIO_CfgPeriph(AT91C_BASE_PIOA, led, 0);
+	} else if(c->periph == PERIPH_B) {
+		AT91F_PIO_CfgPeriph(AT91C_BASE_PIOA, 0, led);
+	} else
+		return;
+	
+	// Configure channel: clock = MCK, period = PWM_PERIOD, CPOL=1, duty cycle variable
+	c->channel->PWMC_CMR = 0x0 | AT91C_PWMC_CPOL;
+	c->channel->PWMC_CDTYR = 1;
+	c->channel->PWMC_CPRDR = PWM_PERIOD;
+	
+	AT91C_BASE_PWMC->PWMC_ENA = (1<<(c->channel_no));
+	vLedSetBrightness(led, 0);
+}
+
 void vLedInit(void)
 {
     // turn off LED's 
-    AT91F_PIO_CfgOutput( AT91C_BASE_PIOA, LED_MASK );
-    AT91F_PIO_SetOutput( AT91C_BASE_PIOA, LED_MASK );
+    AT91F_PIO_CfgOutput( AT91C_BASE_PIOA, LED_RED | LED_GREEN );
+    AT91F_PIO_SetOutput( AT91C_BASE_PIOA, LED_RED | LED_GREEN );
+	
+    AT91F_PMC_EnablePeriphClock(AT91C_BASE_PMC,
+				    ((unsigned int) 1 << AT91C_ID_PWMC));
+    
+    init_led_pwm(LED_GREEN);
+    init_led_pwm(LED_RED);
 }

openpicc/application/led.h

@@ -25,6 +25,9 @@
 
 #include "openpicc.h"
 
+extern void vLedSetBrightness(unsigned int led, int brightness);
+extern void vLedSet(int led, bool_t on);
+extern void vLedBlink(int led);
 extern void vLedSetRed(bool_t on);
 extern void vLedBlinkRed(void);
 extern void vLedSetGreen(bool_t on);