Nice to know that this is actually useful! I had a similar situation in
my work.
On 04/09/2017 09:15 PM, Fahrzin Hemmati wrote:
I have a version of this code internally, so I'd switch to this
function if it got merged in. I use USB port paths to uniquely
determine ftdi devices, but I can convert them to bus and port before
calling into the ftdi library.
On Apr 9, 2017 5:16 PM, "Maxwell Dreytser" <[email protected]
<mailto:[email protected]>> wrote:
Hello all,
This patch adds a function that will open using the specified Bus
and Port. I don't know how useful it would be to others, but I
decided to submit it cause why not. I pretty much just copied
"ftdi_usb_open_desc_index" and modified the parameters and loop.
Maxwell.
--- PATCH Below This line ---
From f49494b97dfeab9ebb5daeeea97ef622f9cc7c9c Mon Sep 17 00:00:00 2001
From: Maxwell Dreytser <[email protected] <mailto:[email protected]>>
Date: Sun, 9 Apr 2017 20:02:56 -0400
Subject: [PATCH] Add a ftdi_usb_open_bus_port function.
---
src/ftdi.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
src/ftdi.h | 1 +
2 files changed, 48 insertions(+)
diff --git a/src/ftdi.c b/src/ftdi.c
index 2fff1ff..d44cbb3 100644
--- a/src/ftdi.c
+++ b/src/ftdi.c
@@ -824,6 +824,53 @@ int ftdi_usb_open_desc_index(struct
ftdi_context *ftdi, int vendor, int product,
}
/**
+ Opens the device at a given USB Bus and Port.
+
+ \param ftdi pointer to ftdi_context
+ \param bus Bus Number
+ \param port Port Number
+
+ \retval 0: all fine
+ \retval -1: usb_find_busses() failed
+ \retval -2: usb_find_devices() failed
+ \retval -3: usb device not found
+ \retval -4: unable to open device
+ \retval -5: unable to claim device
+ \retval -6: reset failed
+ \retval -7: set baudrate failed
+ \retval -8: get product description failed
+ \retval -9: get serial number failed
+ \retval -10: unable to close device
+ \retval -11: ftdi context invalid
+*/
+int ftdi_usb_open_bus_port(struct ftdi_context *ftdi, uint8_t
bus, uint8_t port)
+{
+ libusb_device *dev;
+ libusb_device **devs;
+ int i = 0;
+
+ if (ftdi == NULL)
+ ftdi_error_return(-11, "ftdi context invalid");
+
+ if (libusb_get_device_list(ftdi->usb_ctx, &devs) < 0)
+ ftdi_error_return(-12, "libusb_get_device_list() failed");
+
+ while ((dev = devs[i++]) != NULL)
+ {
+ if (libusb_get_bus_number(dev) == bus &&
libusb_get_port_number(dev) == port)
+ {
+ int res;
+ res = ftdi_usb_open_dev(ftdi, dev);
+ libusb_free_device_list(devs,1);
+ return res;
+ }
+ }
+
+ // device not found
+ ftdi_error_return_free_device_list(-3, "device not found", devs);
+}
+
+/**
Opens the ftdi-device described by a description-string.
Intended to be used for parsing a device-description given as
commandline argument.
diff --git a/src/ftdi.h b/src/ftdi.h
index ef174bf..5927c48 100644
--- a/src/ftdi.h
+++ b/src/ftdi.h
@@ -502,6 +502,7 @@ extern "C"
const char* description, const char*
serial);
int ftdi_usb_open_desc_index(struct ftdi_context *ftdi, int
vendor, int product,
const char* description, const
char* serial, unsigned int index);
+ int ftdi_usb_open_bus_port(struct ftdi_context *ftdi, uint8_t
bus, uint8_t port);
int ftdi_usb_open_dev(struct ftdi_context *ftdi, struct
libusb_device *dev);
int ftdi_usb_open_string(struct ftdi_context *ftdi, const
char* description);
--
2.9.3
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