P0.18 resets device if driven high

RE: P0.18 resets device if driven high

hmolesworth — Fri, 13 Apr 2018 14:57:27 GMT

Depends on the project/compiler/IDE .. an exhaustive search tool is useful, either with find or grep. eg:

f ENABLE_SWO

generates stuff like this:

Search Results: 
// ENABLE_SWO activates SWO pin, otherwise SWO pin is available as GPIO
    /* Enable SWO trace functionality. If ENABLE_SWO is not defined, SWO pin will be used as GPIO (see Product
    #if defined (ENABLE_SWO)
    /* Enable SWO trace functionality. If ENABLE_SWO is not defined, SWO pin will be used as GPIO (see Product
    #if defined (DEVELOP_IN_NRF52832) && defined (ENABLE_SWO)
    /* Enable SWO trace functionality. If ENABLE_SWO is not defined, SWO pin will be used as GPIO (see Product
    #if defined (ENABLE_SWO)

f CONFIG_GPIO_AS_RESET

Search Results: 
// Notes on Reset Pin - CONFIG_GPIO_AS_PINRESET
// If CONFIG_GPIO_AS_PINRESET is defined in the project SystemInit() will set this pin to nReset
// CONFIG_GPIO_AS_PINRESET activates pin reset, otherwise pin nRESET is available as GPIO
          <state>CONFIG_GPIO_AS_PINRESET</state>
          <state>CONFIG_GPIO_AS_PINRESET</state>
                    <state>CONFIG_GPIO_AS_PINRESET</state>
                    <state>CONFIG_GPIO_AS_PINRESET</state>
#define CONFIG_GPIO_AS_PINRESET 1
              <Define> BOARD_PCA10040 CONFIG_GPIO_AS_PINRESET NRF52 NRF52832_XXAA NRF52_PAN_74 NRF_SD_BLE_API_VERSION=5 S132 SOFTDEVICE_PRESENT SWI_DISABLE0</Define>
              <MiscControls> --cpreproc_opts=-DBOARD_PCA10040,-DCONFIG_GPIO_AS_PINRESET,-DNRF52,-DNRF52832_XXAA,-DNRF52_PAN_74,-DNRF_SD_BLE_API_VERSION=5,-DS132,-DSOFTDEVICE_PRESENT,-DSWI_DISABLE0</MiscControls>
              <Define> BOARD_PCA10040 CONFIG_GPIO_AS_PINRESET NRF52 NRF52832_XXAA NRF52_PAN_74 NRF_SD_BLE_API_VERSION=5 S132 SOFTDEVICE_PRESENT SWI_DISABLE0</Define>
CFLAGS += -DCONFIG_GPIO_AS_PINRESET
ASMFLAGS += -DCONFIG_GPIO_AS_PINRESET
          <state>CONFIG_GPIO_AS_PINRESET</state>
          <state>CONFIG_GPIO_AS_PINRESET</state>
              <state>CONFIG_GPIO_AS_PINRESET</state>
                    <state>CONFIG_GPIO_AS_PINRESET</state>
                    <state>CONFIG_GPIO_AS_PINRESET</state>
                            <state>CONFIG_GPIO_AS_PINRESET</state>
                    <state>CONFIG_GPIO_AS_PINRESET</state>
                    <state>CONFIG_GPIO_AS_PINRESET</state>
          <state>CONFIG_GPIO_AS_PINRESET</state>
          <state>CONFIG_GPIO_AS_PINRESET</state>
    /* Configure GPIO pads as pPin Reset pin if Pin Reset capabilities desired. If CONFIG_GPIO_AS_PINRESET is not
    #if defined (CONFIG_GPIO_AS_PINRESET)
etc etc

Have to edit my search batch file f.bat to add in GCC and other compilers files to search:

echo Search Results: >SearchResult.txt
for /R %%f in (*.c *.h *.asm *.s *.src *.eww *.ewp *.uvmpw *.uvproj makefile) DO type %%f | find /I "%1" >> SearchResult.txt

RE: P0.18 resets device if driven high

zolotiyeruki — Thu, 12 Apr 2018 12:58:08 GMT

Do you mean the Makefile?

RE: P0.18 resets device if driven high

Daniel Wang — Wed, 11 Apr 2018 21:29:03 GMT

on issue #2, try using IN_EVENT instead.

nrf_drv_gpiote_in_config_t in_config = GPIOTE_CONFIG_IN_SENSE_LOTOHI(true);

RE: P0.18 resets device if driven high

zolotiyeruki — Wed, 11 Apr 2018 21:14:56 GMT

I may have figured out Problem #1--I think that despite my best efforts, when trying to connect P0.18 to Vcc, I was also accidentally bridging both to GND, causing a short.

RE: P0.18 resets device if driven high

hmolesworth — Wed, 11 Apr 2018 20:21:20 GMT

I don't mean to be pedantic, but the definitions are not in c or h files but in the project file - if used; I know someone was caught out by this (ie me). Your scenario matches exactly ..

RE: P0.18 resets device if driven high

zolotiyeruki — Wed, 11 Apr 2018 20:08:42 GMT

ENABLE_TRACE is not defined, either.

RE: P0.18 resets device if driven high

hmolesworth — Wed, 11 Apr 2018 20:05:01 GMT

Nor ENABLE_TRACE?

RE: P0.18 resets device if driven high

zolotiyeruki — Wed, 11 Apr 2018 18:45:37 GMT

I looked into that earlier. ENABLE_SWO is not defined anywhere in the project as far as I can tell (Eclipse has it greyed out). Nothing else is connected to that pin--it's on an external target, so only VTG, GND, SWDIO and SWCLK are connected to anything external.

RE: P0.18 resets device if driven high

hmolesworth — Wed, 11 Apr 2018 18:42:40 GMT

What is connected to SWO? I ask since it may be connected to a debug tool or other device, since SWO happens to be P0.18 and is used as an output for debug ot trace, see below; if the pin is driving high and it is pulled low externally it can force the power rail into current limit which causes the voltage dip and subsequent device reset.

void SystemInit(void)
{
    /* Enable SWO trace functionality. If ENABLE_SWO is not defined, SWO pin will be used as GPIO (see Product
       Specification to see which one). */
    #if defined (ENABLE_SWO)
        CoreDebug->DEMCR |= CoreDebug_DEMCR_TRCENA_Msk;
        NRF_CLOCK->TRACECONFIG |= CLOCK_TRACECONFIG_TRACEMUX_Serial << CLOCK_TRACECONFIG_TRACEMUX_Pos;
        NRF_P0->PIN_CNF[18] = (GPIO_PIN_CNF_DRIVE_H0H1 << GPIO_PIN_CNF_DRIVE_Pos) | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
    #endif

    /* Enable Trace functionality. If ENABLE_TRACE is not defined, TRACE pins will be used as GPIOs (see Product
       Specification to see which ones). */
    #if defined (ENABLE_TRACE)
        CoreDebug->DEMCR |= CoreDebug_DEMCR_TRCENA_Msk;
        NRF_CLOCK->TRACECONFIG |= CLOCK_TRACECONFIG_TRACEMUX_Parallel << CLOCK_TRACECONFIG_TRACEMUX_Pos;
        NRF_P0->PIN_CNF[14] = (GPIO_PIN_CNF_DRIVE_H0H1 << GPIO_PIN_CNF_DRIVE_Pos) | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
        NRF_P0->PIN_CNF[15] = (GPIO_PIN_CNF_DRIVE_H0H1 << GPIO_PIN_CNF_DRIVE_Pos) | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
        NRF_P0->PIN_CNF[16] = (GPIO_PIN_CNF_DRIVE_H0H1 << GPIO_PIN_CNF_DRIVE_Pos) | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
        NRF_P0->PIN_CNF[18] = (GPIO_PIN_CNF_DRIVE_H0H1 << GPIO_PIN_CNF_DRIVE_Pos) | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
        NRF_P0->PIN_CNF[20] = (GPIO_PIN_CNF_DRIVE_H0H1 << GPIO_PIN_CNF_DRIVE_Pos) | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
    #endif