# HG changeset patch
# User Mychaela Falconia <falcon@freecalypso.org>
# Date 1695840194 0
# Node ID 0787525a33e23c22388bbbb1f7b117ab0b4d9a2d
# Parent  b36397a56bdae85ec218211d93e0648049b194b8
cp2102-decode-ee-desc program started

diff -r b36397a56bda -r 0787525a33e2 .hgignore
--- a/.hgignore	Wed Sep 27 18:38:10 2023 +0000
+++ b/.hgignore	Wed Sep 27 18:43:14 2023 +0000
@@ -3,6 +3,7 @@
 \.[oa]$
 
 ^cp2102/cp2102-decode-baudtab$
+^cp2102/cp2102-decode-ee-desc$
 ^cp2102/cp2102-read-baudtab$
 ^cp2102/cp2102-read-eeprom$
 ^cp2102/cp2102-read-partno$
diff -r b36397a56bda -r 0787525a33e2 cp2102/Makefile
--- a/cp2102/Makefile	Wed Sep 27 18:38:10 2023 +0000
+++ b/cp2102/Makefile	Wed Sep 27 18:43:14 2023 +0000
@@ -1,7 +1,7 @@
 CC=	gcc
 CFLAGS=	-O2
-PROGS=	cp2102-decode-baudtab cp2102-read-baudtab cp2102-read-eeprom \
-	cp2102-read-partno
+PROGS=	cp2102-decode-baudtab cp2102-decode-ee-desc cp2102-read-baudtab \
+	cp2102-read-eeprom cp2102-read-partno
 NOINST=	file_rw_test
 LIBS=	../libuwrap/libuwrap.a
 
@@ -13,6 +13,7 @@
 INSTDAT=${INSTALL_PREFIX}/cp2102
 
 DECODE_BAUDTAB_OBJS=	decode_baudtab.o decode_baudtab_main.o intel_hex_in.o
+DECODE_EEDESC_OBJS=	decode_usb_desc.o intel_hex_in.o
 READ_BAUDTAB_OBJS=	decode_baudtab.o read_baudtab.o read_eeprom.o
 READ_EEPROM_OBJS=	intel_hex_out.o read_eeprom.o read_eeprom_main.o
 RW_TEST_OBJS=		intel_hex_in.o intel_hex_out.o file_rw_test.o
@@ -22,6 +23,9 @@
 cp2102-decode-baudtab:	${DECODE_BAUDTAB_OBJS}
 	${CC} ${CFLAGS} -o $@ ${DECODE_BAUDTAB_OBJS}
 
+cp2102-decode-ee-desc:	${DECODE_EEDESC_OBJS}
+	${CC} ${CFLAGS} -o $@ ${DECODE_EEDESC_OBJS}
+
 cp2102-read-baudtab:	${READ_BAUDTAB_OBJS} ${LIBS}
 	${CC} ${CFLAGS} -o $@ ${READ_BAUDTAB_OBJS} ${LIBS} -lusb
 
diff -r b36397a56bda -r 0787525a33e2 cp2102/decode_usb_desc.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cp2102/decode_usb_desc.c	Wed Sep 27 18:43:14 2023 +0000
@@ -0,0 +1,48 @@
+/*
+ * This program reads a CP2102 EEPROM image from an Intel HEX file
+ * and decodes the USB descriptors portion thereof.
+ */
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "cp210x_defs.h"
+
+u_char eeprom[SIZE_EEPROM];
+
+main(argc, argv)
+	char **argv;
+{
+	if (argc != 2) {
+		fprintf(stderr, "usage: %s ihex-file\n", argv[0]);
+		exit(1);
+	}
+	read_intel_hex(argv[1]);
+	printf("USB device descriptor at 0x3988:\n");
+	printf("  bLength:            %u", eeprom[0x388]);
+	if (eeprom[0x388] != 18)
+		fputs(" (WRONG!)", stdout);
+	putchar('\n');
+	printf("  bDescriptorType:    0x%02X", eeprom[0x389]);
+	if (eeprom[0x389] != 0x01)
+		fputs(" (WRONG!)", stdout);
+	putchar('\n');
+	printf("  bcdUSB:             0x%02X%02X\n",
+		eeprom[0x38B], eeprom[0x38A]);
+	printf("  bDeviceClass:       0x%02X\n", eeprom[0x38C]);
+	printf("  bDeviceSubClass:    0x%02X\n", eeprom[0x38D]);
+	printf("  bDeviceProtocol:    0x%02X\n", eeprom[0x38E]);
+	printf("  bMaxPacketSize0:    0x%02X\n", eeprom[0x38F]);
+	printf("  idVendor:           0x%02X%02X\n",
+		eeprom[0x391], eeprom[0x390]);
+	printf("  idProduct:          0x%02X%02X\n",
+		eeprom[0x393], eeprom[0x392]);
+	printf("  bcdDevice:          0x%02X%02X\n",
+		eeprom[0x395], eeprom[0x394]);
+	printf("  iManufacturer:      %u\n", eeprom[0x396]);
+	printf("  iProduct:           %u\n", eeprom[0x397]);
+	printf("  iSerialNumber:      %u\n", eeprom[0x398]);
+	printf("  bNumConfigurations: %u\n", eeprom[0x399]);
+	/* decoding of other descriptors remains to be implemented */
+	exit(0);
+}