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INFO: Open USB 046d:c318 class  0 failed
BMP hosted v1.7.1-116-g897b3ca42
 for ST-Link V2/3, CMSIS_DAP, JLINK and LIBFTDI/MPSSE
Using 1d50:6018 7BAF7095 Black Sphere Technologies
 Black Magic Probe v1.7.1-116-g897b3ca42
prefix 7&29f9091&0
SYSTEM\CurrentControlSet\Enum\USB\VID_1D50&PID_6018&MI_00\7&29f9091&0&0000\Device Parameters
Portname COM12
+#!GA#
K v1.7.1-116-g897b3ca42#

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Problem:
	While the USART Rx is working and collects data into a buffer calls to write the data to the trace endpoint are failing. The locm3 function returns zero.

Observations:
	
	"usbd_ep_write_packet" returns a value of zero.
	
	Tracing the above call reveals the locm3 function "dwc_ep_write_packet" is called by the above function and the first test made in that method is causing an immediate return:
	
	uint16_t dwc_ep_write_packet(usbd_device *usbd_dev, uint8_t addr,

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void trace_init(uint32_t bitrate, uint32_t channelmask, uint32_t cpu_clock_frequency)
{
    CoreDebug->DEMCR = CoreDebug_DEMCR_TRCENA_Msk ;

    TPI->CSPSR = 1 ;        // Protocol width = 1 bit
    TPI->SPPR = 1 ;         // 1 = Manchester, 2 = Asynchronous
    TPI->ACPR = (cpu_clock_frequency / (2 * bitrate)) - 1 ;
    TPI->FFCR = 0 ;         // Turn off formatter, discard ETM output

    ITM->LAR = 0xC5ACCE55 ;     // unlock access to ITM

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gcc -L -g -obmdebug.exe bmdebug.o bmscan.o bmp-script.o elf-postlink.o guidriver.o minIni.o rs232.o specialfolder.o strlcpy.o decodectf.o parsetsdl.o swotrace.o nuklear.o nuklear_gdip.o noc_file_dialog.o -lm -lgdiplus -lwinusb
guidriver.o: In function `guidriver_init':
C:\DataRoot\Projects\Black-Magic-Probe-Book\source/guidriver.c:101: undefined reference to `__imp_GetStockObject'
swotrace.o: In function `usb_GetDevicePath':
C:\DataRoot\Projects\Black-Magic-Probe-Book\source/swotrace.c:499: undefined reference to `__imp_SetupDiGetClassDevsA'
C:\DataRoot\Projects\Black-Magic-Probe-Book\source/swotrace.c:506: undefined reference to `__imp_SetupDiEnumDeviceInterfaces'
C:\DataRoot\Projects\Black-Magic-Probe-Book\source/swotrace.c:517: undefined reference to `__imp_SetupDiGetDeviceInterfaceDetailA'
C:\DataRoot\Projects\Black-Magic-Probe-Book\source/swotrace.c:527: undefined reference to `__imp_SetupDiGetDeviceInterfaceDetailA'
C:\DataRoot\Projects\Black-Magic-Probe-Book\source/swotrace.c:543: undefined reference t

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PS C:\DataRoot\Projects\blackmagic\src> make CC=gcc V=1 PROBE_HOST=LIBFTDI
echo " GIT include/version.h"
" GIT include/version.h"
echo #define FIRMWARE_VERSION "v1.6.1-292-g3165d64" > include/version.h
"  CC      target/adiv5.c"
gcc -Wall -Wextra -Werror -Wno-char-subscripts -Wno-cast-function-type -O2 -std=gnu99 -g3 -MD -I. -Iinclude -Iplatforms/common -Iplatforms/LIBFTDI -DLIBFTDI -DENABLE_DEBUG -Wno-cast-function-type -c target/adiv5.c -o adiv5.o
"  CC      target/adiv5_jtagdp.c"
gcc -Wall -Wextra -Werror -Wno-char-subscripts -Wno-cast-function-type -O2 -std=gnu99 -g3 -MD -I. -Iinclude -Iplatforms/common -Iplatforms/LIBFTDI -DLIBFTDI -DENABLE_DEBUG -Wno-cast-function-type -c target/adiv5_jtagdp.c -o adiv5_jtagdp.o
"  CC      target/adiv5_swdp.c"
gcc -Wall -Wextra -Werror -Wno-char-subscripts -Wno-cast-function-type -O2 -std=gnu99 -g3 -MD -I. -Iinclude -Iplatforms/common -Iplatforms/LIBFTDI -DLIBFTDI -DENABLE_DEBUG -Wno-cast-function-type -c target/adiv5_swdp.c -o adiv5_swdp.o

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<?xml version="1.0" encoding="UTF-8"?>
<package xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"
         xmlns:saxon="http://saxon.sf.net//"
         schemaVersion="1.3"
         xs:schemaLocation="http://www.atmel.com/schemas/pack-device-atmel-extension PACK.DEVICE.ATMEL.EXTENSION.xsd"
         xs:noNamespaceSchemaLocation="PACK.xsd">
   <vendor>Atmel</vendor>
   <url>http://packs.download.atmel.com/</url>
   <name>SAMR21_DFP</name>
   <description>Atmel SAMR21 Series Device Support</description>

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gcc -Wall -Wextra -Werror -Wno-char-subscripts -Wno-cast-function-type -Ic:\libusb\include -Og -g  -std=gnu99 -g3 -MD -I. -Iinclude -Iplatfor
ms/common -Iplatforms/stlinkv2 -DLIBFTDI  -DSTLINKV2 -DJTAG_HL -I ./target -Wno-cast-function-type -c command.c -o command.o
In file included from command.c:31:0:
include/version.h:1:1: error: expected identifier or '(' before string constant
 "#define FIRMWARE_VERSION \"`git describe --always --dirty`\""
 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
command.c:41:2: error: unknown type name 'cmd_handler'
  cmd_handler handler;
  ^~~~~~~~~~~
command.c:67:15: error: 'cmd_handler' undeclared here (not in a function); did you mean 'cmd_hard_srst'?

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#define	WDBP_BATTERY_INPUT			0	// ADC Channel for battery input
#define	WDBP_TARGET_VOLTAGE_INPUT	8	// ADC Chanmel for target voltage

#define	WDBP_ADC_BATTERY	0
#define	WDBP_ADC_TARGET		1

static uint32_t	inputVoltages[2] = { 0 };
static uint8_t	adcChannels[2] = { WDBP_BATTERY_INPUT , WDBP_TARGET_VOLTAGE_INPUT };

////////////////////////////////////////////////////////////////////////////////////////////////////

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In file included from /usr/include/w32api/winsock2.h:56:0,
                 from platforms/libftdi/gdb_if.c:33:
/usr/include/w32api/psdk_inc/_fd_types.h:100:2: error: #warning "fd_set and associated macros have been defined in sys/types.      This can cause runtime problems with W32 sockets" [-Werror=cpp]
 #warning "fd_set and associated macros have been defined in sys/types.  \
  ^~~~~~~
In file included from platforms/libftdi/gdb_if.c:33:0:
/usr/include/w32api/winsock2.h:995:34: error: conflicting types for ‘select’
   WINSOCK_API_LINKAGE int WSAAPI select(int nfds,fd_set *readfds,fd_set *writefds,fd_set *exceptfds,const PTIMEVAL timeout);
                                  ^~~~~~
In file included from /usr/include/sys/types.h:68:0,

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  CC      platforms/libftdi/gdb_if.c
platforms/libftdi/gdb_if.c:27:16: error: extra tokens at end of #ifndef directive [-Werror]
 #ifndef _WIN32 || defined __CYGWIN__
                ^~
platforms/libftdi/gdb_if.c: In function ‘gdb_if_init’:
platforms/libftdi/gdb_if.c:47:15: error: extra tokens at end of #ifdef directive [-Werror]
 #ifdef _WIN32 || defined __CYGWIN__
               ^~
platforms/libftdi/gdb_if.c: At top level:
cc1: error: unrecognized command line option ‘-Wno-cast-function-type’ [-Werror]