From df3c4395bc496254267b53c2e4ae1ee879f1a00d Mon Sep 17 00:00:00 2001
From: hackbard <hackbard>
Date: Mon, 26 Feb 2007 13:30:52 +0000
Subject: [PATCH] added fx2 rule to Makefile

---
 fx2/Makefile |  7 +++-
 fx2/fx2.c    | 95 ++++++++++++++++++++++++++++++++++++++++++++++++----
 2 files changed, 95 insertions(+), 7 deletions(-)

diff --git a/fx2/Makefile b/fx2/Makefile
index 3b3c0b8..d847258 100644
--- a/fx2/Makefile
+++ b/fx2/Makefile
@@ -3,10 +3,15 @@ CFLAGS = -Wall -O3
 
 OBJECTS = ee2ihex usb_bulk_test
 
-all: $(OBJECTS)
+all: $(OBJECTS) fx2
+
+fx2:
+	sdcc fx2.c
 
 clean:
 	rm -f $(OBJECTS)
+	rm -f fx2.ihx
+	rm -f *.asm
 	rm -f *.lnk
 	rm -f *.lst
 	rm -f *.map
diff --git a/fx2/fx2.c b/fx2/fx2.c
index aa8d4cb..6b2fe21 100644
--- a/fx2/fx2.c
+++ b/fx2/fx2.c
@@ -21,29 +21,71 @@ typedef unsigned char u8;
 typedef unsigned short u16;
 typedef unsigned int u32;
 
-/* fx2 register */
+/*
+ * fx2 register
+ */
+
+/* general configuration */
+xdata at 0xe600 volatile u8 CPUCS;
+xdata at 0xe601 volatile u8 IFCONFIG;
+
+/* endpoint configuration */
+xdata at 0xe60b volatile u8 REVCTL;
+xdata at 0xe612 volatile u8 EP2CFG;
+xdata at 0xe614 volatile u8 EP6CFG;
+xdata at 0xe618 volatile u8 EP2FIFOCFG;
+xdata at 0xe619 volatile u8 EP4FIFOCFG;
+xdata at 0xe61a volatile u8 EP6FIFOCFG;
+xdata at 0xe61b volatile u8 EP8FIFOCFG;
+
+/* special funtion registers */
 sfr at 0xb5 OED;
 sfr at 0xb0 IOD;
 
+/* synchronization delay after writing/reading to registers 0xe600 - 0xe6ff
+ * and some others (p. 438).
+ * maximum delay necessary at highest cpu speed: 16 cycles => 17 nops */
+#define SYNCDELAY _asm \
+	nop; nop; nop; nop; nop; nop; nop; nop; \
+	nop; nop; nop; nop; nop; nop; nop; nop; \
+	nop; _endasm
+
 void power_on() {
 
+	/* high level must be applied to the mosfet gate for power on
+	 *
+	 * ref: http://digilentinc.com/Data/Products/NEXYS/Nexys_sch.pdf
+	 */
+
+	/* configure pin 7 of port d as output */
 	OED|=(1<<7);
+
+	/* pull it high */
 	IOD|=(1<<7);
 }
 
 void slave_fifo_init() {
 
+	/* initialization of the slave fifo, used by external logic (the fpga)
+	 * to do usb communication with the host */
+
 	/* set bit 0 and 1 - fifo slave config */	
 	IFCONFIG|=0x03;
 
 	/* async mode */
 	IFCONFIG|=0x04;
 
-	/* 8 bit fifo to all endpoints */
-	EP2FIFOCFG&=^(1<<0);
-	EP4FIFOCFG&=^(1<<0);
-	EP6FIFOCFG&=^(1<<0);
-	EP8FIFOCFG&=^(1<<0);
+	/* p. 180: must be set to 1 */
+	REVCTL|=((1<<0)|(1<<1));
+
+	/* 8 bit fifo to all endpoints
+	 *
+	 * ('or' of all these bits define port d functionality)
+	 */
+	EP2FIFOCFG&=~(1<<0);
+	EP4FIFOCFG&=~(1<<0);
+	EP6FIFOCFG&=~(1<<0);
+	EP8FIFOCFG&=~(1<<0);
 
 	/* default indexed flag configuration:
 	 *
@@ -54,6 +96,46 @@ void slave_fifo_init() {
 	 * todo: -> fixed configuration
 	 */
 
+	/* endpoint configuration:
+	 *
+	 * (assuming 'high bandwidth in' [fpga -> host]
+	 *  and 'low bandwidth out' [host->fpga] applications)
+	 * 
+	 * ep2: bulk in 3x1024
+	 * ep6: bulk out 2x512
+	 *
+	 * 0xeb = 1 1 1 0 1 0 1 1 = bulk in 3x1024
+	 * 0xa2 = 1 0 1 0 0 0 1 0 = bulk out 2x512
+	 * 0x01 = 0 0 0 0 0 0 0 1 = invalid (bit,type,buf)
+	 */
+	EP2CFG=0xeb;
+	EP4CFG=0x01;
+	EP6CFG=0xa2;
+	EP8CFG=0x01;
+
+	/* reset the fifo */
+	FIFORESET=0x80; /* nak all transfers */
+	FIFORESET=0x02; /* reset ep2 */
+	FIFORESET=0x06; /* reset ep6 */
+	FIFORESET=0x00; /* restore normal operation */
+
+	/* auto in/out, no cpu interaction! auto in len = 1024 */
+	EP2FIFOCFG|=(1<<3);
+	EP2AUTOINLENH=(1<<2);
+	EP2AUTOINLENL=0;
+	EP6FIFOCFG|=(1<<4);
+
+	/* maybe OUTPKTEND necessary (with skip=1) */
+}
+
+void ep1_init() {
+
+	/* initialize endpoint 1 (will be used for jtag) */
+
+	/* endpoint 1 configuration:
+	 *
+	 * default (valid, bulk) fits!
+	 */
 
 }
 
@@ -65,6 +147,7 @@ void fx2_init() {
 	/* slave fifo init */
 	slave_fifo_init();
 
+	/* ep1_init(); */
 }
 
 void main() {
-- 
2.20.1