cJSON_print() issue

RE: cJSON_print() issue

code-magic — Tue, 12 Oct 2021 09:26:15 GMT

I fixed this issue by altering my prj.conf file. The main culprit is shown below.

CONFIG_MAIN_STACK_SIZE=4096

RE: cJSON_print() issue

code-magic — Tue, 12 Oct 2021 00:54:02 GMT

So I am still getting crashes after calling cJSON_Init(). My prj.conf is below. I'm at a loss.

CONFIG_CJSON_LIB=y

# newlibc
CONFIG_NEWLIB_LIBC=y
CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y
CONFIG_FPU=y
CONFIG_FPU_SHARING=y

# Heap and stacks
CONFIG_HEAP_MEM_POOL_SIZE=32768
CONFIG_MAIN_STACK_SIZE=1280
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048
CONFIG_HW_STACK_PROTECTION=y

RE: cJSON_print() issue

Rafalino — Thu, 25 Mar 2021 20:42:58 GMT

I had a similar issue and what I found out was that it was related to a wrong behavior in my code:

In one case I allocated memory using k_malloc but released it with free instead of k_free.

Once I fixed this wrong behavior the crashes disappeared.

RE: cJSON_print() issue

Tiago Costa — Mon, 04 May 2020 15:24:44 GMT

Just would like to let you know that I've figured out what was wrong with my code. I was having unexpected kernel panics / reboots because I had forgot to inicialize the cJSON library. I've managed to fix the reboots by adding this at the beginning of my code:

cJSON_Init();

Hope this can fix your problem too.

RE: cJSON_print() issue

Shekhar Suthar — Thu, 30 Apr 2020 19:56:31 GMT

Thanks,

[quote userid="26000" url="~/f/nordic-q-a/60746/cjson_print-issue/247647"]cJSON in the asset_tracker example[/quote]

> That part is working because there are Numbers in String format not Not in INT, I checked already like {"temp" : "23" }

but i'm looking like that {"temp" : 23 }..

> I did get what you try to say by that

[quote userid="26000" url="~/f/nordic-q-a/60746/cjson_print-issue/247647"]I also needed to add CONFIG_MODEM_INFO_ADD_DATE_TIME=n[/quote]

RE: cJSON_print() issue

Tiago Costa — Thu, 30 Apr 2020 19:47:48 GMT

Hi,

I'm having a similar issue. I can use cJSON in the asset_tracker example to retrieve modem information without problems, but if I try to run the same code in the mqtt_simple sample, my board reboots on cJSON_PrintUnformatted() after calling modem_info_json_string_encode(). Couldn't yet figure out what's causing this.

Sample code:

	err = modem_info_init();
	if (err) {
		printk("Modem info could not be established: %d", err);
		return;
	}

	modem_info_params_init(&modem_param);

        cJSON *root_obj = cJSON_CreateObject();

	if (root_obj == NULL) {
		printk("Unable to allocate JSON object");
		return;
	}

	size_t item_cnt = 0;

        int ret = modem_info_params_get(&modem_param);
        char root_buf[MODEM_INFO_JSON_STRING_SIZE];

	if (ret < 0) {
		printk("Unable to obtain modem parameters: %d", ret);
	} else {
                printk("Got modem parameters");
		ret = modem_info_json_object_encode(&modem_param, root_obj);
		if (ret > 0) {
			item_cnt = (size_t)ret;
		}
                modem_info_json_string_encode(&modem_param, root_buf);
                data_print("Modem info: ", root_buf, MODEM_INFO_JSON_STRING_SIZE);
	}

Error in console:

Got modem parameters[00:00:19.870,330] <err> os: ***** BUS FAULT *****
[00:00:19.875,854] <err> os:   Precise data bus error
[00:00:19.881,683] <err> os:   BFAR Address: 0x6eef9a63
[00:00:19.887,664] <err> os: r0/a1:  0x000fffff  r1/a2:  0x0000000f  r2/a3:  0x000fffff
[00:00:19.896,484] <err> os: r3/a4:  0x20029834 r12/ip:  0x8168b400 r14/lr:  0x0000f10b
[00:00:19.905,273] <err> os:  xpsr:  0xa100b800
[00:00:19.910,552] <err> os: s[ 0]:  0x00000005  s[ 1]:  0x00000000  s[ 2]:  0x00000000  s[ 3]:  0x00000000
[00:00:19.921,112] <err> os: s[ 4]:  0x00000000  s[ 5]:  0x00000000  s[ 6]:  0x00000000  s[ 7]:  0x00000000
[00:00:19.931,671] <err> os: s[ 8]:  0x00000000  s[ 9]:  0x00000000  s[10]:  0x00000000  s[11]:  0x00000000
[00:00:19.942,230] <err> os: s[12]:  0x00000000  s[13]:  0x00000000  s[14]:  0x00000000  s[15]:  0x00000000
[00:00:19.952,728] <err> os: fpscr:  0x2002d4c0
[00:00:19.958,007] <err> os: Faulting instruction address (r15/pc): 0x00024162
[00:00:19.965,972] <err> os: >>> ZEPHYR FATAL ERROR 0: CPU exception on CPU 0
[00:00:19.973,846] <err> os: Current thread: 0x20021e3c (unknown)
[00:00:19.980,712] <err> fatal_error: Resetting system

By the way, I also needed to add CONFIG_MODEM_INFO_ADD_DATE_TIME=n in my prj.conf, otherwise retrieving modem information would fail. I have:

CONFIG_HEAP_MEM_POOL_SIZE=16384
CONFIG_MAIN_STACK_SIZE=8192

RE: cJSON_print() issue

Shekhar Suthar — Thu, 30 Apr 2020 07:40:09 GMT

hello team,

I waiting for your answer If you have anything to give me .... ??

I tried with other json lib ( this one) too but the result is same as last time

RE: cJSON_print() issue

Shekhar Suthar — Wed, 29 Apr 2020 13:58:55 GMT

Yes I did and I got point out like that

RE: cJSON_print() issue

Martin Lesund — Wed, 29 Apr 2020 13:25:18 GMT

Have you tried setting up a debug session to see where in the code it triggers the reset?

RE: cJSON_print() issue

Shekhar Suthar — Wed, 29 Apr 2020 10:05:27 GMT

[quote userid="66115" url="~/f/nordic-q-a/60746/cjson_print-issue/246829"]Please share the error output and more of your code.[/quote]

void main(void)
{
	
	if (!IS_ENABLED(CONFIG_AT_HOST_LIBRARY)) {
		/* Stop the UART RX for power consumption reasons */
		NRF_UARTE0_NS->TASKS_STOPRX = 1;
		NRF_UARTE1_NS->TASKS_STOPRX = 1;
	}


      cJSON *Attribute_json = NULL;
      cJSON *Device_data1 = NULL;
      cJSON *Device_data2 = NULL;
      cJSON *Data = NULL;
      cJSON *Sensor = NULL;
      char *out = NULL;

    Attribute_json = cJSON_CreateArray();
    cJSON_AddItemToArray(Attribute_json, Device_data1 = cJSON_CreateObject());
    cJSON_AddStringToObject(Device_data1, "uniqueId","uniqueId");
    cJSON_AddStringToObject(Device_data1, "time","2020-04-01T06:23:23.000Z");
    cJSON_AddItemToObject(Device_data1, "data", Data = cJSON_CreateObject());
    cJSON_AddNumberToObject(Device_data1,"Humidity", 45);
    //cJSON_AddStringToObject(Device_data1,"Humidity", "45");

    cJSON_AddNumberToObject(Data,"Temperature",23);

   
    out = cJSON_PrintUnformatted(Attribute_json);
    //out = cJSON_Print(Attribute_json);

    while(1){
       printk("\n >> %s \n",out);
       // printk("\n >> %s \n",cJSON_PrintBuffered(Attribute_json, 2000,0));
       k_sleep(5000);
       }

}

I shared main function try to in that I just want to print that Json I tried two three way you can see in comments parts

tried with making different function and pass there may be that will work but result is same

cJSON_AddNumberToObject(Device_data1,"Humidity", 45);

if I use that way to add a Number in JSON that will restart again and again my device

but if I used String on that case its working fine as below comment code

// cJSON_AddStringToObject(Device_data1,"Humidity", "45");

even if add a single json number in object that isn't working fine ????

RE: cJSON_print() issue

Shekhar Suthar — Mon, 27 Apr 2020 13:20:51 GMT

I want publish my JSON data by MQTT to cloud

[quote userid="66115" url="~/f/nordic-q-a/60746/cjson_print-issue/246829"]Could you try to use this as a reference?[/quote]

I tried that way too but when I return cJSON that send blank value in string

RE: cJSON_print() issue

Martin Lesund — Mon, 27 Apr 2020 12:28:03 GMT

Hi Sekhar,
Please share the error output and more of your code.

Could you try to use this as a reference? https://github.com/civetweb/civetweb/blob/master/examples/rest/rest.c#L60

RE: cJSON_print() issue

Shekhar Suthar — Mon, 27 Apr 2020 06:00:50 GMT

hello team its like 4th day today and I didn't get nay update from your end

please ..