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uart and wifi not working together

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uart and wifi not working together

Posted: Tue Apr 09, 2019 7:38 am
by asmaalekar
Hello Everyone,

I am trying to start wifi in sation mode after I receive some data on UART, I am using ESP32. after receiving value on uart I am calling wifi init after wifi initialisation I am getting
Guru Meditation Error: Core 0 panic'ed (LoadStoreError). Exception was unhandle d.
Core 0 register dump:

My code is

Code: Select all

#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/event_groups.h"
#include "esp_system.h"
#include "esp_wifi.h"
#include "esp_event_loop.h"
#include "esp_log.h"
#include "nvs_flash.h"
#include "driver/uart.h"
#include "soc/uart_struct.h"
#include "lwip/err.h"
#include "lwip/sys.h"

static const int RX_BUF_SIZE = 1024;

#define TXD_PIN 					(GPIO_NUM_17)
#define RXD_PIN 					(GPIO_NUM_16)
#define WIFI_SSID      				"xxxxx"
#define WIFI_PASS      				"xxxxxxxx"
#define EXAMPLE_MAX_STA_CONN       	CONFIG_MAX_STA_CONN
static intr_handle_t handle_console;

/* The event group allows multiple bits for each event,
   but we only care about one event - are we connected
   to the AP with an IP? */
const static int CONNECTED_BIT = BIT0;
#define OPENSSL_EXAMPLE_TARGET_NAME        CONFIG_TARGET_DOMAIN
#define OPENSSL_EXAMPLE_TARGET_TCP_PORT    CONFIG_TARGET_PORT_NUMBER
// Receive buffer to collect incoming data
uint8_t rxbuf[256], flag = 0;
// Register to collect data length
uint16_t urxlen;

typedef enum {
   // Commands from IMX to ESP - Wifi
    EnableWifi = 0x30,
    GetWifiStatus,
    SetWifiConfig,
    Number_of_AccessPoints_List,
    Number_of_AccessPoints_Record,
    Access_Point_Conected_Info,
    Set_MAC_Address,
    Get_IP_Address,
    Get_GatewayAddress,
    DisconnectWifi,
    Set_Tx_Power,
    Get_Auth_Mode,

    // Common codes for ESP
    ESP_Initialised = 0x50,
    Get_ESP32_Status,
    Get_ESP32_Mode,
    MAC_Address,
    Firmware_Version_Number,
    SW_Version_Number,

    Default_State= 0x7F,

}WifiCommands;

/* FreeRTOS event group to signal when we are connected*/
static EventGroupHandle_t s_wifi_event_group;

static const char *TAG = "wifi softAP";
char *txData = "ESP Initialised";

void wifi_init(void);


void uart_init() {
    const uart_config_t uart_config = {
        .baud_rate = 115200,
        .data_bits = UART_DATA_8_BITS,
        .parity = UART_PARITY_DISABLE,
        .stop_bits = UART_STOP_BITS_1,
        .flow_ctrl = UART_HW_FLOWCTRL_DISABLE
    };
    uart_param_config(UART_NUM_1, &uart_config);
    uart_set_pin(UART_NUM_1, TXD_PIN, RXD_PIN, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
    // We won't use a buffer for sending data.
    uart_driver_install(UART_NUM_1, RX_BUF_SIZE * 2, 0, 0, NULL, 0);

}

int sendData(const char* logName, const char* data)
{
    const int len = strlen(txData);
    const int txBytes = uart_write_bytes(UART_NUM_1, txData, len);
    ESP_LOGI(logName, "Wrote %d bytes", txBytes);
    return txBytes;
}

static void tx_task()
{
    static const char *TX_TASK_TAG = "TX_TASK";
    esp_log_level_set(TX_TASK_TAG, ESP_LOG_INFO);
    while(1)
    {
    	if(flag == 0) {
        sendData(TX_TASK_TAG, "Hello world");

    	}
    	else
    	{
    		sendData(TX_TASK_TAG, "Hello world");
    	}
    	vTaskDelay(10000/portTICK_PERIOD_MS);
    }
}

static void rx_task()
{
    static const char *RX_TASK_TAG = "RX_TASK";
    esp_log_level_set(RX_TASK_TAG, ESP_LOG_INFO);
    uint8_t* data = (uint8_t*) malloc(RX_BUF_SIZE+1);

    while (1) {
    	ESP_LOGI(RX_TASK_TAG,"rx task");
        const int rxBytes = uart_read_bytes(UART_NUM_1, data, RX_BUF_SIZE, 1000 / portTICK_RATE_MS);
        if (rxBytes > 0) {
        	ESP_LOGI(RX_TASK_TAG,"Received bytes = %d",rxBytes);

            data[rxBytes] = 0;
            switch (data[0]){

            case EnableWifi:
            case ESP_Initialised:

            	ESP_LOGI(RX_TASK_TAG,"Enable Wifi");
            	if(flag ==0)
            	{

            		strcpy(txData, "Wifi Init");
            		flag=1;
            	}


            	break;
            case SetWifiConfig:

            	break;
            case Set_MAC_Address:

            	break;
            case Get_IP_Address:

            	break;
            case DisconnectWifi:

            	break;

            case Set_Tx_Power:

            	break;

            }

        }
        vTaskDelay(5000/portTICK_PERIOD_MS);
    }
    free(data);
}

static esp_err_t event_handler(void *ctx, system_event_t *event)
{
    switch(event->event_id) {

    case SYSTEM_EVENT_STA_START:
    	ESP_LOGI(TAG, "wifi event connect");
    	esp_wifi_connect();
    	break;

    case SYSTEM_EVENT_STA_GOT_IP:
    	ESP_LOGI(TAG, "wifi event got ip");
    	xEventGroupSetBits(s_wifi_event_group, CONNECTED_BIT);
    	strcpy(txData, "Connected to Swift Tech");
    	//openssl_example_client_init();
         break;

    case SYSTEM_EVENT_STA_DISCONNECTED:
        /* This is a workaround as ESP32 WiFi libs don't currently
        auto-reassociate. */

        esp_wifi_connect();
        xEventGroupClearBits(s_wifi_event_group, CONNECTED_BIT);
        break;

    default:
        break;

    }
    return ESP_OK;
}

void wifi_init()
{
    s_wifi_event_group = xEventGroupCreate();

    tcpip_adapter_init();
    ESP_ERROR_CHECK(esp_event_loop_init(event_handler, NULL));

    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
    ESP_ERROR_CHECK(esp_wifi_init(&cfg));
    wifi_config_t wifi_config = {
        .ap = {
            .ssid = WIFI_SSID,
            .ssid_len = strlen(WIFI_SSID),
            .password = WIFI_PASS,
            .max_connection = EXAMPLE_MAX_STA_CONN,
            .authmode = WIFI_AUTH_WPA_WPA2_PSK
        },
    };
    if (strlen(WIFI_PASS) == 0) {
        wifi_config.ap.authmode = WIFI_AUTH_OPEN;
    }

    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
    ESP_ERROR_CHECK(esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_config));
    ESP_ERROR_CHECK(esp_wifi_start());

    ESP_LOGI(TAG, "wifi init finished. SSID:%s password:%s",
             WIFI_SSID, WIFI_PASS);
}

void app_main()
{
    //Initialize NVS
    esp_err_t ret = nvs_flash_init();
    if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
      ESP_ERROR_CHECK(nvs_flash_erase());
      ret = nvs_flash_init();
    }
    ESP_ERROR_CHECK(ret);

    uart_init();
    wifi_init();

    xTaskCreate(rx_task, "uart_rx_task", 1024*2, NULL, configMAX_PRIORITIES, NULL);
    //xTaskCreate(tx_task, "uart_tx_task", 1024*2, NULL, configMAX_PRIORITIES-1, NULL);
    while(1)
    {
    	tx_task();
    }
}
Error log
[Codebox]load:0x40078000,len:11308
load:0x40080400,len:6680
entry 0x40080760
I (31) boot: ESP-IDF v4.0-dev-207-g76da10a66-dirty 2nd stage bootloader
I (31) boot: compile time 16:41:15
I (32) boot: Enabling RNG early entropy source...
I (37) boot: SPI Speed : 40MHz
I (42) boot: SPI Mode : DIO
I (46) boot: SPI Flash Size : 4MB
I (50) boot: Partition Table:
I (53) boot: ## Label Usage Type ST Offset Length
I (60) boot: 0 nvs WiFi data 01 02 00009000 00006000
I (68) boot: 1 phy_init RF data 01 01 0000f000 00001000
I (75) boot: 2 factory factory app 00 00 00010000 00100000
I (83) boot: End of partition table
I (87) esp_image: segment 0: paddr=0x00010020 vaddr=0x3f400020 size=0x18618 ( 99 864) map
I (131) esp_image: segment 1: paddr=0x00028640 vaddr=0x3ffb0000 size=0x02ff0 ( 1 2272) load
I (136) esp_image: segment 2: paddr=0x0002b638 vaddr=0x40080000 size=0x00400 ( 1024) load
I (138) esp_image: segment 3: paddr=0x0002ba40 vaddr=0x40080400 size=0x045d0 ( 1 7872) load
I (154) esp_image: segment 4: paddr=0x00030018 vaddr=0x400d0018 size=0x67820 (42 3968) map
I (304) esp_image: segment 5: paddr=0x00097840 vaddr=0x400849d0 size=0x0bda0 ( 4 8544) load
I (334) boot: Loaded app from partition at offset 0x10000
I (334) boot: Disabling RNG early entropy source...
I (335) cpu_start: Pro cpu up.
I (338) cpu_start: Application information:
I (343) cpu_start: Project name: wifi_softAP
I (348) cpu_start: App version: v4.0-dev-207-g76da10a66-dirty
I (355) cpu_start: Compile time: Apr 9 2019 16:40:08
I (361) cpu_start: ELF file SHA256: 2af6b75480f86821...
I (367) cpu_start: ESP-IDF: v4.0-dev-207-g76da10a66-dirty
I (374) cpu_start: Starting app cpu, entry point is 0x400810d8
I (366) cpu_start: App cpu up.
I (385) heap_init: Initializing. RAM available for dynamic allocation:
I (392) heap_init: At 3FFAE6E0 len 00001920 (6 KiB): DRAM
I (398) heap_init: At 3FFB8DD0 len 00027230 (156 KiB): DRAM
I (404) heap_init: At 3FFE0440 len 00003AE0 (14 KiB): D/IRAM
I (410) heap_init: At 3FFE4350 len 0001BCB0 (111 KiB): D/IRAM
I (417) heap_init: At 40090770 len 0000F890 (62 KiB): IRAM
I (423) cpu_start: Pro cpu start user code
I (106) cpu_start: Starting scheduler on PRO CPU.
I (0) cpu_start: Starting scheduler on APP CPU.
I (170) RX_TASK: rx task
I (170) TX_TASK: Wrote 15 bytes
I (1310) RX_TASK: Received bytes = 10
I (1310) RX_TASK: Enable Wifi
I (1310) wifi: wifi driver task: 3ffc1f5c, prio:23, stack:3584, core=0
I (1310) wifi: wifi firmware version: 8b94b0e
I (1310) wifi: config NVS flash: enabled
I (1320) wifi: config nano formating: disabled
I (1320) system_api: Base MAC address is not set, read default base MAC address from BLK0 of EFUSE
I (1330) system_api: Base MAC address is not set, read default base MAC address from BLK0 of EFUSE
I (1360) wifi: Init dynamic tx buffer num: 32
I (1370) wifi: Init data frame dynamic rx buffer num: 32
I (1370) wifi: Init management frame dynamic rx buffer num: 32
I (1370) wifi: Init management short buffer num: 32
I (1370) wifi: Init static rx buffer size: 1600
I (1380) wifi: Init static rx buffer num: 10
I (1380) wifi: Init dynamic rx buffer num: 32
I (1520) phy: phy_version: 4100, 6fa5e27, Jan 25 2019, 17:02:06, 0, 0
I (1520) wifi: mode : sta (b4:e6:2d:9e:88:f5)
I (1520) wifi softAP: wifi init finished. SSID:xxxx password:xxxxxxxxxx
Guru Meditation Error: Core 0 panic'ed (LoadStoreError). Exception was unhandle d.
Core 0 register dump:
PC : 0x4000c2ff PS : 0x00060b30 A0 : 0x800d2e31 A1 : 0x3f fbe100
A2 : 0x3f40337c A3 : 0x3f403350 A4 : 0x0000000a A5 : 0x3f 40337c
A6 : 0x69666957 A7 : 0x696e4920 A8 : 0x00000000 A9 : 0x3f fbdf70
A10 : 0x400dc9cc A11 : 0x3ffb3c48 A12 : 0x3f403290 A13 : 0x00 000028
A14 : 0x00000006 A15 : 0x00000005 SAR : 0x00000004 EXCCAUSE: 0x00 000003
EXCVADDR: 0x3f40337c LBEG : 0x4000c2e0 LEND : 0x4000c2f6 LCOUNT : 0xff ffffff

ELF file SHA256: 2af6b75480f86821f4fd555a78910d0078602e9f806e22d530e8f305e2d7dc3 7

Backtrace: 0x4000c2ff:0x3ffbe100 0x400d2e2e:0x3ffbe110 0x4008da35:0x3ffbe130

Rebooting...
ets Jun 8 2016 00:22:57

rst:0xc (SW_CPU_RESET),boot:0x17 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0018,len:4
load:0x3fff001c,len:6368
ho 0 tail 12 room 4
load:0x40078000,len:11308
load:0x40080400,len:6680
entry 0x40080760
[/Codebox]

Please help me with this? What I am doing wrong for initialization, I have even tried with uart ISR its giving me same problem.

Re: uart and wifi not working together

Posted: Tue Apr 09, 2019 8:24 am
by WiFive

Code: Select all

char *txData = "ESP Initialised";
strcpy(txData, "Connected to Swift Tech");
:?

Re: uart and wifi not working together

Posted: Tue Apr 09, 2019 8:28 am
by asmaalekar
What is the problem with that?

Its causing problem after wifi init, I guess. Please help.

Any sample program which uses both uart and wifi?

Re: uart and wifi not working together

Posted: Tue Apr 09, 2019 8:42 am
by ESP_Sprite
How large is the memory that is reserved for the string on the first line? How long is the string you try to copy into that memory on the 2nd line?

Re: uart and wifi not working together

Posted: Tue Apr 09, 2019 9:03 am
by WiFive
And WHERE is the string literal located in memory?

Re: uart and wifi not working together

Posted: Tue Apr 09, 2019 9:46 am
by asmaalekar
Oops, its a char pointer I have initialised it to ESP_initialise string value and then trying to copy "Wifi Init" into after wifi initializaton.I havent allocated any memory for it. Is that causing a problem?

I will try tomorrow morning and let you know.

Thank you so much.

Re: uart and wifi not working together

Posted: Wed Apr 10, 2019 12:01 am
by asmaalekar
Yes it was the same problem. Thank you so much, I changed it to array from pointer. Lesson learnt for life.

Thanks once again.

Cheers,
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