//#define JLINK_TAP_BUFFER_SIZE 384
#define JLINK_IN_BUFFER_SIZE 2048
-#define JLINK_OUT_BUFFER_SIZE 2*2048+4
+#define JLINK_OUT_BUFFER_SIZE 2*2048 + 4
#define JLINK_EMU_RESULT_BUFFER_SIZE 64
/* Global USB buffers */
"query jlink info");
register_command(cmd_ctx, NULL, "jlink_hw_jtag",
&jlink_handle_jlink_hw_jtag_command, COMMAND_EXEC,
- "set/get jlink hw jtag command version [2|3]");
+ "set/get jlink hw jtag command version [2 | 3]");
return ERROR_OK;
}
static int jlink_init(void)
{
- int check_cnt;
int i;
jlink_jtag_handle = jlink_usb_open();
LOG_ERROR("Cannot find jlink Interface! Please check connection and permissions.");
return ERROR_JTAG_INIT_FAILED;
}
+
+ /*
+ * The next three instructions were added after discovering a problem while using an oscilloscope. For the V8
+ * SAM-ICE dongle (and likely other j-link device variants), the reset line to the target microprocessor was found to
+ * cycle only intermittently during emulator startup (even after encountering the downstream reset instruction later
+ * in the code). This was found to create two issues: 1) In general it is a bad practice to not reset a CPU to a known
+ * state when starting an emulator and 2) something critical happens inside the dongle when it does the first read
+ * following a new USB session. Keeping the processor in reset during the first read collecting version information
+ * seems to prevent errant "J-Link command EMU_CMD_VERSION failed" issues.
+ */
+
+ LOG_INFO("J-Link initialization started / target CPU reset initiated");
+ jlink_simple_command(EMU_CMD_HW_TRST0);
+ jlink_simple_command(EMU_CMD_HW_RESET0);
+ usleep(1000);
jlink_hw_jtag_version = 2;
- check_cnt = 0;
- while (check_cnt < 3)
- {
- if (jlink_get_version_info() == ERROR_OK)
- {
- /* attempt to get status */
- jlink_get_status();
- break;
- }
- check_cnt++;
- }
-
- if (check_cnt == 3)
+ if (jlink_get_version_info() == ERROR_OK)
{
- LOG_INFO("J-Link initial read failed, don't worry");
+ /* attempt to get status */
+ jlink_get_status();
}
LOG_INFO("J-Link JTAG Interface ready");
{
jlink_simple_command(EMU_CMD_HW_TRST0);
}
+
if (trst == 0)
{
jlink_simple_command(EMU_CMD_HW_TRST1);
- jtag_sleep(5000);
- jlink_end_state(TAP_RESET);
- jlink_state_move();
}
}
{
int result;
int len;
- u32 jlink_caps, jlink_max_size;
+ uint32_t jlink_caps, jlink_max_size;
/* query hardware version */
jlink_simple_command(EMU_CMD_VERSION);
}
jlink_caps = buf_get_u32(usb_in_buffer, 0, 32);
- LOG_INFO("JLink caps 0x%x", jlink_caps);
+ LOG_INFO("JLink caps 0x%x", (unsigned)jlink_caps);
if (jlink_caps & (1 << EMU_CAP_GET_HW_VERSION))
{
return ERROR_JTAG_DEVICE_ERROR;
}
- u32 jlink_hw_version = buf_get_u32(usb_in_buffer, 0, 32);
- u32 major_revision = (jlink_hw_version / 10000) % 100;
+ uint32_t jlink_hw_version = buf_get_u32(usb_in_buffer, 0, 32);
+ uint32_t major_revision = (jlink_hw_version / 10000) % 100;
if (major_revision >= 5)
jlink_hw_jtag_version = 3;
- LOG_INFO("JLink hw version %i", jlink_hw_version);
+ LOG_INFO("JLink hw version %i", (int)jlink_hw_version);
}
if (jlink_caps & (1 << EMU_CAP_GET_MAX_BLOCK_SIZE))
}
jlink_max_size = buf_get_u32(usb_in_buffer, 0, 32);
- LOG_INFO("JLink max mem block %i", jlink_max_size);
+ LOG_INFO("JLink max mem block %i", (int)jlink_max_size);
}
return ERROR_OK;
/* J-Link tap functions */
-static unsigned tap_length=0;
+static unsigned tap_length = 0;
static uint8_t tms_buffer[JLINK_TAP_BUFFER_SIZE];
static uint8_t tdi_buffer[JLINK_TAP_BUFFER_SIZE];
static uint8_t tdo_buffer[JLINK_TAP_BUFFER_SIZE];
if (index >= JLINK_TAP_BUFFER_SIZE)
{
LOG_ERROR("jlink_tap_append_step: overflow");
- *(u32 *)0xFFFFFFFF = 0;
+ *(uint32_t *)0xFFFFFFFF = 0;
exit(-1);
}
for (i = 0; i < length; i++)
{
int tms = (i < (length - 1)) ? 0 : 1;
- int tdi = (buffer[i / 8] & (1 << (i % 8)))!=0;
+ int tdi = (buffer[i / 8] & (1 << (i % 8))) != 0;
jlink_tap_append_step(tms, tdi);
}
pending_scan_results_length++;
/* JLink returns an extra NULL in packet when size of in message is a multiple of 64, creates problems with usb comms */
/* WARNING This will interfere with tap state counting */
- while ((TAP_SCAN_BYTES(tap_length)%64)==0)
+ while ((TAP_SCAN_BYTES(tap_length)%64) == 0)
{
jlink_tap_append_step((tap_get_state() == TAP_RESET)?1:0, 0);
}
return ERROR_OK;
}
+static struct usb_device* find_jlink_device(void)
+{
+ struct usb_bus *busses;
+ struct usb_bus *bus;
+ struct usb_device *dev;
+
+ usb_find_busses();
+ usb_find_devices();
+
+ busses = usb_get_busses();
+
+ /* find jlink_jtag device in usb bus */
+
+ for (bus = busses; bus; bus = bus->next)
+ {
+ for (dev = bus->devices; dev; dev = dev->next)
+ {
+ if ((dev->descriptor.idVendor == VID) && (dev->descriptor.idProduct == PID)) {
+ return dev;
+ }
+ }
+ }
+
+ return NULL;
+}
+
/*****************************************************************************/
/* JLink USB low-level functions */
static jlink_jtag_t* jlink_usb_open()
{
- struct usb_bus *busses;
- struct usb_bus *bus;
struct usb_device *dev;
jlink_jtag_t *result;
result = (jlink_jtag_t*) malloc(sizeof(jlink_jtag_t));
usb_init();
- usb_find_busses();
- usb_find_devices();
- busses = usb_get_busses();
+ if ((dev = find_jlink_device()) == NULL) {
+ free(result);
+ return NULL;
+ }
- /* find jlink_jtag device in usb bus */
+ result->usb_handle = usb_open(dev);
- for (bus = busses; bus; bus = bus->next)
+ if (result->usb_handle)
{
- for (dev = bus->devices; dev; dev = dev->next)
+
+ /* BE ***VERY CAREFUL*** ABOUT MAKING CHANGES IN THIS AREA!!!!!!!!!!!
+ * The behavior of libusb is not completely consistent across Windows, Linux, and Mac OS X platforms. The actions taken
+ * in the following compiler conditionals may not agree with published documentation for libusb, but were found
+ * to be necessary through trials and tribulations. Even little tweaks can break one or more platforms, so if you do make changes
+ * test them carefully on all platforms before committing them!
+ */
+
+#if IS_WIN32 == 0
+
+ usb_reset(result->usb_handle);
+
+#if IS_DARWIN == 0
+
+ int timeout = 5;
+
+ /* reopen jlink after usb_reset
+ * on win32 this may take a second or two to re-enumerate */
+ while ((dev = find_jlink_device()) == NULL)
{
- if ((dev->descriptor.idVendor == VID) && (dev->descriptor.idProduct == PID))
- {
- result->usb_handle = usb_open(dev);
+ usleep(1000);
+ timeout--;
+ if (!timeout) {
+ break;
+ }
+ }
- /* usb_set_configuration required under win32 */
- usb_set_configuration(result->usb_handle, dev->config[0].bConfigurationValue);
- usb_claim_interface(result->usb_handle, 0);
+ if (dev == NULL)
+ {
+ free(result);
+ return NULL;
+ }
+
+ result->usb_handle = usb_open(dev);
+#endif
+
+#endif
+
+ if (result->usb_handle)
+ {
+ /* usb_set_configuration required under win32 */
+ usb_set_configuration(result->usb_handle, dev->config[0].bConfigurationValue);
+ usb_claim_interface(result->usb_handle, 0);
#if 0
- /*
- * This makes problems under Mac OS X. And is not needed
- * under Windows. Hopefully this will not break a linux build
- */
- usb_set_altinterface(result->usb_handle, 0);
+ /*
+ * This makes problems under Mac OS X. And is not needed
+ * under Windows. Hopefully this will not break a linux build
+ */
+ usb_set_altinterface(result->usb_handle, 0);
#endif
- struct usb_interface *iface = dev->config->interface;
- struct usb_interface_descriptor *desc = iface->altsetting;
- for (int i = 0; i < desc->bNumEndpoints; i++)
- {
- uint8_t epnum = desc->endpoint[i].bEndpointAddress;
- bool is_input = epnum & 0x80;
- LOG_DEBUG("usb ep %s %02x", is_input ? "in" : "out", epnum);
- if (is_input)
- jlink_read_ep = epnum;
- else
- jlink_write_ep = epnum;
- }
-
- return result;
+ struct usb_interface *iface = dev->config->interface;
+ struct usb_interface_descriptor *desc = iface->altsetting;
+ for (int i = 0; i < desc->bNumEndpoints; i++)
+ {
+ uint8_t epnum = desc->endpoint[i].bEndpointAddress;
+ bool is_input = epnum & 0x80;
+ LOG_DEBUG("usb ep %s %02x", is_input ? "in" : "out", epnum);
+ if (is_input)
+ jlink_read_ep = epnum;
+ else
+ jlink_write_ep = epnum;
}
+
+ return result;
}
}
result2 = jlink_usb_read_emu_result(jlink_jtag);
if (1 != result2)
{
- LOG_ERROR("jlink_usb_read_emu_result retried requested=1, result=%d, in_length=%i", result2,in_length);
- /* Try again once, should only happen if (in_length%64==0) */
+ LOG_ERROR("jlink_usb_read_emu_result retried requested = 1, result=%d, in_length=%i", result2,in_length);
+ /* Try again once, should only happen if (in_length%64 == 0) */
result2 = jlink_usb_read_emu_result(jlink_jtag);
if (1 != result2)
{
LOG_ERROR("jlink_usb_read_emu_result failed "
- "(requested=1, result=%d)", result2);
+ "(requested = 1, result=%d)", result2);
return ERROR_JTAG_DEVICE_ERROR;
}
}
projects / fw / openocd / blobdiff