From b3d30ca742cf82c604d58f10c53fcd5a45d65e54 Mon Sep 17 00:00:00 2001
From: Paul Goeser <paul@rakka.de>
Date: Sat, 14 Jan 2012 12:44:48 +0100
Subject: [PATCH] debugging, disabled a few things, ringbuffer and pwm working,
 sdcard timeouts in init

---
 gg.c  | 33 ++++++++++++++++++++++++++++-----
 mmc.c | 14 +++++++++++++-
 mmc.h | 11 ++++-------
 3 files changed, 45 insertions(+), 13 deletions(-)

diff --git a/gg.c b/gg.c
index 0908fe5..ca9a222 100644
--- a/gg.c
+++ b/gg.c
@@ -54,40 +54,63 @@ ISR(TIMER1_OVF1_vect){
     // next try: simplistic, not too much looking at speed
     uint16_t next = 0;
 
+//    OCR1B += 1; // test pwm
     if(!--cnt_to_next){
         ringbuf_get(&rb, &next);
         OCR1B = next>>8;
         cnt_to_ocr_incr = 8 - (next & 0x7);
         cnt_to_next = 8;
-        if(!--length)
+/*        if(!--length)
         {
-        	/* shut down */
+        	// shut down
         	PORTA &= ~(1 << PA7);
-        }
+        }*/
     } else {
         if(!--cnt_to_ocr_incr){
            OCR1B += 1;
         }
     }
+    
 }
 
 
 int main(void) __attribute__((noreturn));
 int main(void)
 {
+    _delay_ms(30); // wait for card to get power
+    uint8_t debug=0;
 	DDRA |= (1 << PA7);
 	PORTA |= (1 << PA7);
 	ringbuf_init(&rb, buffer, BUFFER_SIZE);
-	if(mmc_init() != 0) {/* mmc fail */;}
+    debug = 1;
+//    while(debug){
+    	debug=mmc_init();
+//    }
+//    debug = 2;
 	
 	mmc_read_part(0, (unsigned char *) &length, 4);
 	
 	timer_init_tiny26();
 	sei();
 	
+/*    
 	unsigned long block = 0;
 	for(;; block++)
 	{
 		mmc_read_to_ringbuffer(block, &rb);
-	}
+	} // */
+//    debug = 0;
+
+    uint8_t i,r;
+    uint16_t a;
+    for(;;){
+        i += debug*8;
+        a = i<<8;
+        r=1;
+        while(r){
+            r=ringbuf_put(&rb, a);
+        }
+    }// */
+
+
 }
diff --git a/mmc.c b/mmc.c
index 11e6808..6ebe22d 100644
--- a/mmc.c
+++ b/mmc.c
@@ -92,6 +92,17 @@ unsigned char mmc_init ()
 	return(0);
 }
 
+//set MMC_Chip_Select to high (MMC/SD-Karte Inaktiv)
+void MMC_Disable(){
+    WAIT_HALF_CLOCK;  MMC_Write|= (1<<MMC_Chip_Select); WAIT_HALF_CLOCK;
+}
+
+//set MMC_Chip_Select to low (MMC/SD-Karte Aktiv)
+void MMC_Enable(){
+    WAIT_HALF_CLOCK; MMC_Write&=~(1<<MMC_Chip_Select); WAIT_HALF_CLOCK;
+}
+
+
 //############################################################################
 //Sendet ein Commando an die MMC/SD-Karte
 unsigned char mmc_write_command (unsigned char *cmd)
@@ -167,6 +178,7 @@ void mmc_write_byte (unsigned char Byte)
 #else			//Routine für Software SPI
 	for(uint8_t current_bit = 1 << 7; current_bit; current_bit >>= 1) //das Byte wird Bitweise nacheinander Gesendet MSB First
 	{
+		MMC_Write &= ~(1<<SPI_Clock);	//erzeugt ein Clock Impuls (LOW)
 		if(Byte & current_bit)	//Ist Bit a in Byte gesetzt
 		{
 			MMC_Write |= (1<<SPI_DO); //Set Output High
@@ -175,9 +187,9 @@ void mmc_write_byte (unsigned char Byte)
 		{
 			MMC_Write &= ~(1<<SPI_DO); //Set Output Low
 		}
-		MMC_Write &= ~(1<<SPI_Clock);	//erzeugt ein Clock Impuls (LOW)
 		WAIT_HALF_CLOCK;
 		MMC_Write |= (1<<SPI_Clock); //setzt Clock Impuls wieder auf (High)
+                                     // bei dieser flanke werden die daten von der karte gelesen
 		WAIT_HALF_CLOCK;
 	}
 	MMC_Write |= (1<<SPI_DO);	//setzt Output wieder auf High
diff --git a/mmc.h b/mmc.h
index 97fc605..c7ad943 100644
--- a/mmc.h
+++ b/mmc.h
@@ -14,7 +14,7 @@ Copyright (C) 2004 Ulrich Radig
 
 //#define SPI_Mode			1		//1 = Hardware SPI | 0 = Software SPI
 #define SPI_Mode			0
-#define WAIT_HALF_CLOCK _delay_us(1)
+#define WAIT_HALF_CLOCK _delay_us(50)
 
 #define MMC_Write			PORTA	//Port an der die MMC/SD-Karte angeschlossen ist also des SPI
 #define MMC_Read			PINA
@@ -80,12 +80,9 @@ extern unsigned char mmc_read_csd (unsigned char *);
 
 extern unsigned char mmc_read_cid (unsigned char *);
 
-//set MMC_Chip_Select to high (MMC/SD-Karte Inaktiv)
-#define MMC_Disable() MMC_Write|= (1<<MMC_Chip_Select);
-
-//set MMC_Chip_Select to low (MMC/SD-Karte Aktiv)
-#define MMC_Enable() MMC_Write&=~(1<<MMC_Chip_Select);
-
 #define nop()  __asm__ __volatile__ ("nop" ::)
 
+void MMC_Disable();
+void MMC_Enable();
+
 #endif //_MMC_H_