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stlink: print target voltage if supported 

The stlink/v2 has the ability to check the target voltage if the firmware
is recent enough (>= J13).

As a debugging aid we check the voltage at startup and issue an error if
this is too low to debug reliably.

Change-Id: I98e251f3880e31049c4307051c30bedd3451cf87
Signed-off-by: Spencer Oliver <spen@spen-soft.co.uk>
Reviewed-on: http://openocd.zylin.com/980
Tested-by: jenkins
This commit is contained in:
Spencer Oliver 2012-11-15 11:20:20 +00:00
parent e0d4d46dbe
commit 928289773c
1 changed files with 58 additions and 0 deletions
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58
src/jtag/drivers/stlink_usb.c
View File

@ -107,6 +107,7 @@ struct stlink_usb_handle_s {
#define STLINK_DFU_COMMAND 0xF3
#define STLINK_SWIM_COMMAND 0xF4
#define STLINK_GET_CURRENT_MODE 0xF5
#define STLINK_GET_TARGET_VOLTAGE 0xF7
#define STLINK_DEV_DFU_MODE 0x00
#define STLINK_DEV_MASS_MODE 0x01
@ -424,6 +425,40 @@ static int stlink_usb_version(void *handle)
return ERROR_OK;
}
static int stlink_usb_check_voltage(void *handle, float *target_voltage)
{
struct stlink_usb_handle_s *h;
uint32_t adc_results[2];
h = (struct stlink_usb_handle_s *)handle;
/* only supported by stlink/v2 and for firmware >= 13 */
if (h->version.stlink == 1 || h->version.jtag < 13)
return ERROR_COMMAND_NOTFOUND;
stlink_usb_init_buffer(handle, STLINK_RX_EP, 8);
h->cmdbuf[h->cmdidx++] = STLINK_GET_TARGET_VOLTAGE;
int result = stlink_usb_xfer(handle, h->databuf, 8);
if (result != ERROR_OK)
return result;
/* convert result */
adc_results[0] = le_to_h_u32(h->databuf);
adc_results[1] = le_to_h_u32(h->databuf + 4);
*target_voltage = 0;
if (adc_results[0])
*target_voltage = 2 * ((float)adc_results[1]) * (float)(1.2 / adc_results[0]);
LOG_INFO("Target voltage: %f", (double)*target_voltage);
return ERROR_OK;
}
/** */
static int stlink_usb_current_mode(void *handle, uint8_t *mode)
{
@ -593,6 +628,29 @@ static int stlink_usb_init_mode(void *handle)
if (res != ERROR_OK)
return res;
/* we check the target voltage here as an aid to debugging connection problems.
* the stlink requires the target Vdd to be connected for reliable debugging.
* this cmd is supported in all modes except DFU
*/
if (mode != STLINK_DEV_DFU_MODE) {
float target_voltage;
/* check target voltage (if supported) */
res = stlink_usb_check_voltage(h, &target_voltage);
if (res != ERROR_OK) {
if (res != ERROR_COMMAND_NOTFOUND)
LOG_ERROR("voltage check failed");
/* attempt to continue as it is not a catastrophic failure */
} else {
/* check for a sensible target voltage, operating range is 1.65-5.5v
* according to datasheet */
if (target_voltage < 1.5)
LOG_ERROR("target voltage may be too low for reliable debugging");
}
}
LOG_DEBUG("MODE: 0x%02X", mode);
/* set selected mode */