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mpsse: Always perform a general reset of the MPSSE in mpsse_open() 

Per AN_135 FTDI MPSSE Basics Version 1.1, section 4.2 step 7.
http://www.ftdichip.com/Support/Documents/AppNotes/AN_135_MPSSE_Basics.pdf

This allows to stop and restart OpenOCD reliably, without needing
to power cycle the interface.

Change-Id: Ibeafe5ecfe7b2f6f82712cbc85116904407ddb36
Signed-off-by: Peter Stuge <peter@stuge.se>
Reviewed-on: http://openocd.zylin.com/939
Tested-by: jenkins
This commit is contained in:
Peter Stuge 2012-10-28 05:42:15 +01:00
parent d2f61e1a45
commit 452248af1d
1 changed files with 14 additions and 0 deletions
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14
src/jtag/drivers/mpsse.c
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@ -55,6 +55,7 @@
#define FTDI_DEVICE_OUT_REQTYPE (LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_RECIPIENT_DEVICE)
#define FTDI_DEVICE_IN_REQTYPE (0x80 | LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_RECIPIENT_DEVICE)
#define BITMODE_RESET 0x00
#define BITMODE_MPSSE 0x02
#define SIO_RESET_REQUEST 0x00
@ -312,6 +313,19 @@ struct mpsse_ctx *mpsse_open(const uint16_t *vid, const uint16_t *pid, const cha
goto error;
}
err = libusb_control_transfer(ctx->usb_dev,
FTDI_DEVICE_OUT_REQTYPE,
SIO_SET_BITMODE_REQUEST,
0x0b | (BITMODE_RESET << 8),
ctx->index,
NULL,
0,
ctx->usb_write_timeout);
if (err < 0) {
LOG_ERROR("unable to reset bitmode: %d", err);
goto error;
}
err = libusb_control_transfer(ctx->usb_dev,
FTDI_DEVICE_OUT_REQTYPE,
SIO_SET_BITMODE_REQUEST,