Tip / Sign in to post questions, reply, level up, and achieve exciting badges. Know more

Code for ww101-Chapter 4-2: Json Parser

save_3366371
Level 2
First like received
Level 2

Hello,

I couldn't find the code that is used in Chapter 4-2: Json Parser. I found the github page CypressAcademy_WW101_Files/Projects/ww101key/04 at master · cypresssemiconductorco/CypressAcademy_WW...  with all the code, but 05_jason.c is not the same that is shown in the video tutorial. The code shown in the video, is it posted somewhere else?

Thanks,

Santosh

0 Likes
1 Solution
AlanH_86
Employee
100 replies posted 50 replies posted 25 solutions authored
Employee

OK.. I know what happened.

We decided that the example was too stupidly complicated... so we fixed it in the textbook and the solution.

Probably I should make a new video for that to show the simpler thing.

Here is the actual original solution.

#include <wiced.h>

#include <JSON.h>

#include <stdint.h>

//

// Defines for the I2C connection

//

//

// This is the 7 bit I2C address for the PSoC based analog front end

// sensor hub

//

#define PSOC_SENSOR_HUB_I2C_ADDRESS             (0x42)

//

// This register is the control register for the LEDs that sit above

// the CapSense buttons.  If this register contains 1, the LEDs are

// controlled by the data registers.  If this register contains 0,

// the LEDs are controlled by the CapSense buttons

//

#define PSOC_SENSOR_HUB_LED_CONTROL             (0x05)

//

// If the control register above contains 1, this register contains the

// state of the LEDs.  Bit zero is the LED state for button 0.  Bit one is the

// LED state for button 1.  Bit two is the LED state for button 2, and bit three

// is the LED state for button 3.

//

#define PSOC_SENSOR_HUB_LED_DATA                (0x04)

//

// This is the JSON data to parse. Because the 'C' format of the data harder to read with

// the embedded quotes and broken over lines, it is replicated here in the comment to be easier

// to understand.

//

// { "i2cleds" : { "1":"on", "2":"off", "3":"on", "4":"on"}, "gpioleds" : { "1":"off", "2":"on"}}

//

const char json_data[] =

        "{"

        "   \"i2cleds\" :"

        "      {"

        "         \"1\": \"on\","

        "         \"2\": \"off\","

        "         \"3\": \"on\","

        "         \"4\": \"off\""

        "       },"

        "   \"gpioleds\" :"

        "      {"

        "        \"1\": \"on\","

        "        \"2\": \"on\""

        "      }"

        "}" ;

//

// Data array for writing EZ-I2C formatted data.  The first byte

// is the address and the second byte is the data.  We initialize

// this array to write a 1 to address 5 which enables I2C register

// control of the LEDs instead of the CapSense button control which

// is default.

//

uint8_t data[] = { PSOC_SENSOR_HUB_LED_CONTROL, 0x01 } ;

//

// The flags for each I2C transaction.  We do simple read or write

// transactions so we just start and stop during each transaction.

//

const uint16_t flags = WICED_I2C_START_FLAG | WICED_I2C_STOP_FLAG ;

//

// The data structure used to define a specific I2C target we are addressing.  This

// is the address for the sensor hub / psoc AFE

//

const wiced_i2c_device_t dev = {

        .port = WICED_I2C_2,                                // I2C instance 2 on the WICED device platform

        .address = PSOC_SENSOR_HUB_I2C_ADDRESS,             // I2C peripheral address 0x42

        .address_width = I2C_ADDRESS_WIDTH_7BIT,            // I2C we have seven bit addresses

        .speed_mode = I2C_STANDARD_SPEED_MODE               // Traditional (100 Khz) speed

};

//

// The parsed state of the I2C LEDs

//

uint8_t i2cleds = 0 ;

//

// The parsed state of the GPIO LEDs

//

uint8_t gpioleds = 0 ;

//

// This function sets the state of the I2C LEDs based on the state value given.  This state

// value is written directly to the I2C LED state register.  Each of the four lower bits

// of this value maps to an LED on the board.

//

static void setI2Cleds(uint8_t state)

{

    //

    // Actually write the ledstate data via I2C to the register (4) that

    // controls the LED lights.

    //

    data[0] = PSOC_SENSOR_HUB_LED_DATA ;

    data[1] = state ;

    if (wiced_i2c_write(&dev, flags, data, sizeof(data)) != WICED_SUCCESS)

    {

        WPRINT_APP_INFO(("I2C Write Failed\n")) ;

    }

}

//

// This function sets the state of the GPIO controlled LEDs based on the state value given.

// The lower two bits of the state control the state of the two LEDs connected to GPIOs.

//

static void setGPIOleds(uint8_t state)

{

    if (state & 0x01)

        wiced_gpio_output_high(WICED_LED1) ;

    if (state & 0x02)

        wiced_gpio_output_high(WICED_LED2) ;

}

//

// This function is called during the parsing of the JSON text.  It is called when a

// complete item is parsed.

//

wiced_result_t jsonCallback(wiced_json_object_t *obj_p)

{

    //

    // This conditional ensures that

    // - We have a parent object

    // - The length of the name of the parent object is 7

    // - The parent object is named i2cleds

    // - The current object name length is one character

    // - The current object type is JSON_STRING_TYPE

    // - The current object value is "on"

    //

    if (obj_p->parent_object != NULL && obj_p->parent_object->object_string_length == 7 &&

            strncmp(obj_p->parent_object->object_string, "i2cleds", 7) == 0 &&

            obj_p->object_string_length == 1 && obj_p->value_type == JSON_STRING_TYPE && strncmp(obj_p->value, "on", 2) == 0)

    {

        switch(obj_p->object_string[0])

        {

        case '1':

            i2cleds |= 0x01 ;

            break ;

        case '2':

            i2cleds |= 0x02 ;

            break ;

        case '3':

            i2cleds |= 0x04 ;

            break ;

        case '4':

            i2cleds |= 0x08 ;

            break ;

        }

    }

    //

    // This conditional ensures that

    // - We have a parent object

    // - The length of the name of the parent object is 8

    // - The parent object is named gpioleds

    // - The current object name length is one character

    // - The current object type is JSON_STRING_TYPE

    // - The current object value is "on"

    //

    else if (obj_p->parent_object != NULL && obj_p->parent_object->object_string_length == 8 &&

            strncmp(obj_p->parent_object->object_string, "gpioleds", 😎 == 0 &&

            obj_p->object_string_length == 1 && obj_p->value_type == JSON_STRING_TYPE && strncmp(obj_p->value, "on", 2) == 0)

    {

        switch(obj_p->object_string[0])

        {

        case '1':

            gpioleds |= 0x01 ;

            break ;

        case '2':

            gpioleds |= 0x02 ;

            break ;

        }

    }

    return WICED_SUCCESS ;

}

void application_start()

{

    wiced_result_t result ;

    //

    // Print a message about starting and show what we are actually parsing

    //

    WPRINT_APP_INFO(("Starting JSON_parser Example Program\n")) ;

    WPRINT_APP_INFO(("Parsing JSON: '%s'\n", json_data)) ;

    //

    // Initialize the I2C port

    //

    wiced_i2c_init(&dev) ;

    //

    // Write the initial I2C data which is basically 0x05, 0x01.  This programs

    // a value of 1 into register 5 which give us I2C register control over the

    // LEDs.

    //

    if (wiced_i2c_write(&dev, flags, data, sizeof(data)) != WICED_SUCCESS)

    {

        WPRINT_APP_INFO(("I2C Write Failed\n")) ;

    }

    //

    // Parse the JSON data

    //

    wiced_JSON_parser_register_callback(jsonCallback) ;

    result = wiced_JSON_parser(json_data, sizeof(json_data) - 1) ;

    if (result != WICED_SUCCESS)

    {

        //

        // If this message is printed, you are playing with the JSON data and have

        // changed it in a way that makes the data invalid and therefore it cannot be parsed.

        //

        WPRINT_APP_INFO(("The JSON was not valid and could not be parsed.\n")) ;

    }

    else

    {

        setI2Cleds(i2cleds) ;

        setGPIOleds(gpioleds) ;

    }

}

View solution in original post

5 Replies
save_3366371
Level 2
First like received
Level 2

Even https://github.com/cypresssemiconductorco/CypressAcademy_WW101_Files/blob/master/Projects/ww101key/0...​ 03_cjson.c is not the same that is shown in the video tutorial.

0 Likes
AlanH_86
Employee
100 replies posted 50 replies posted 25 solutions authored
Employee

Well... all of the code is supposed to be on the Cypress GitHub website...

GitHub - cypresssemiconductorco/CypressAcademy_WW101_Files

But clearly there is some disconnect...   Im sorry about that... Ill look and see.

Alan

0 Likes
save_3366371
Level 2
First like received
Level 2

That would be great. Thanks Alan.

0 Likes
AlanH_86
Employee
100 replies posted 50 replies posted 25 solutions authored
Employee

OK.. I know what happened.

We decided that the example was too stupidly complicated... so we fixed it in the textbook and the solution.

Probably I should make a new video for that to show the simpler thing.

Here is the actual original solution.

#include <wiced.h>

#include <JSON.h>

#include <stdint.h>

//

// Defines for the I2C connection

//

//

// This is the 7 bit I2C address for the PSoC based analog front end

// sensor hub

//

#define PSOC_SENSOR_HUB_I2C_ADDRESS             (0x42)

//

// This register is the control register for the LEDs that sit above

// the CapSense buttons.  If this register contains 1, the LEDs are

// controlled by the data registers.  If this register contains 0,

// the LEDs are controlled by the CapSense buttons

//

#define PSOC_SENSOR_HUB_LED_CONTROL             (0x05)

//

// If the control register above contains 1, this register contains the

// state of the LEDs.  Bit zero is the LED state for button 0.  Bit one is the

// LED state for button 1.  Bit two is the LED state for button 2, and bit three

// is the LED state for button 3.

//

#define PSOC_SENSOR_HUB_LED_DATA                (0x04)

//

// This is the JSON data to parse. Because the 'C' format of the data harder to read with

// the embedded quotes and broken over lines, it is replicated here in the comment to be easier

// to understand.

//

// { "i2cleds" : { "1":"on", "2":"off", "3":"on", "4":"on"}, "gpioleds" : { "1":"off", "2":"on"}}

//

const char json_data[] =

        "{"

        "   \"i2cleds\" :"

        "      {"

        "         \"1\": \"on\","

        "         \"2\": \"off\","

        "         \"3\": \"on\","

        "         \"4\": \"off\""

        "       },"

        "   \"gpioleds\" :"

        "      {"

        "        \"1\": \"on\","

        "        \"2\": \"on\""

        "      }"

        "}" ;

//

// Data array for writing EZ-I2C formatted data.  The first byte

// is the address and the second byte is the data.  We initialize

// this array to write a 1 to address 5 which enables I2C register

// control of the LEDs instead of the CapSense button control which

// is default.

//

uint8_t data[] = { PSOC_SENSOR_HUB_LED_CONTROL, 0x01 } ;

//

// The flags for each I2C transaction.  We do simple read or write

// transactions so we just start and stop during each transaction.

//

const uint16_t flags = WICED_I2C_START_FLAG | WICED_I2C_STOP_FLAG ;

//

// The data structure used to define a specific I2C target we are addressing.  This

// is the address for the sensor hub / psoc AFE

//

const wiced_i2c_device_t dev = {

        .port = WICED_I2C_2,                                // I2C instance 2 on the WICED device platform

        .address = PSOC_SENSOR_HUB_I2C_ADDRESS,             // I2C peripheral address 0x42

        .address_width = I2C_ADDRESS_WIDTH_7BIT,            // I2C we have seven bit addresses

        .speed_mode = I2C_STANDARD_SPEED_MODE               // Traditional (100 Khz) speed

};

//

// The parsed state of the I2C LEDs

//

uint8_t i2cleds = 0 ;

//

// The parsed state of the GPIO LEDs

//

uint8_t gpioleds = 0 ;

//

// This function sets the state of the I2C LEDs based on the state value given.  This state

// value is written directly to the I2C LED state register.  Each of the four lower bits

// of this value maps to an LED on the board.

//

static void setI2Cleds(uint8_t state)

{

    //

    // Actually write the ledstate data via I2C to the register (4) that

    // controls the LED lights.

    //

    data[0] = PSOC_SENSOR_HUB_LED_DATA ;

    data[1] = state ;

    if (wiced_i2c_write(&dev, flags, data, sizeof(data)) != WICED_SUCCESS)

    {

        WPRINT_APP_INFO(("I2C Write Failed\n")) ;

    }

}

//

// This function sets the state of the GPIO controlled LEDs based on the state value given.

// The lower two bits of the state control the state of the two LEDs connected to GPIOs.

//

static void setGPIOleds(uint8_t state)

{

    if (state & 0x01)

        wiced_gpio_output_high(WICED_LED1) ;

    if (state & 0x02)

        wiced_gpio_output_high(WICED_LED2) ;

}

//

// This function is called during the parsing of the JSON text.  It is called when a

// complete item is parsed.

//

wiced_result_t jsonCallback(wiced_json_object_t *obj_p)

{

    //

    // This conditional ensures that

    // - We have a parent object

    // - The length of the name of the parent object is 7

    // - The parent object is named i2cleds

    // - The current object name length is one character

    // - The current object type is JSON_STRING_TYPE

    // - The current object value is "on"

    //

    if (obj_p->parent_object != NULL && obj_p->parent_object->object_string_length == 7 &&

            strncmp(obj_p->parent_object->object_string, "i2cleds", 7) == 0 &&

            obj_p->object_string_length == 1 && obj_p->value_type == JSON_STRING_TYPE && strncmp(obj_p->value, "on", 2) == 0)

    {

        switch(obj_p->object_string[0])

        {

        case '1':

            i2cleds |= 0x01 ;

            break ;

        case '2':

            i2cleds |= 0x02 ;

            break ;

        case '3':

            i2cleds |= 0x04 ;

            break ;

        case '4':

            i2cleds |= 0x08 ;

            break ;

        }

    }

    //

    // This conditional ensures that

    // - We have a parent object

    // - The length of the name of the parent object is 8

    // - The parent object is named gpioleds

    // - The current object name length is one character

    // - The current object type is JSON_STRING_TYPE

    // - The current object value is "on"

    //

    else if (obj_p->parent_object != NULL && obj_p->parent_object->object_string_length == 8 &&

            strncmp(obj_p->parent_object->object_string, "gpioleds", 😎 == 0 &&

            obj_p->object_string_length == 1 && obj_p->value_type == JSON_STRING_TYPE && strncmp(obj_p->value, "on", 2) == 0)

    {

        switch(obj_p->object_string[0])

        {

        case '1':

            gpioleds |= 0x01 ;

            break ;

        case '2':

            gpioleds |= 0x02 ;

            break ;

        }

    }

    return WICED_SUCCESS ;

}

void application_start()

{

    wiced_result_t result ;

    //

    // Print a message about starting and show what we are actually parsing

    //

    WPRINT_APP_INFO(("Starting JSON_parser Example Program\n")) ;

    WPRINT_APP_INFO(("Parsing JSON: '%s'\n", json_data)) ;

    //

    // Initialize the I2C port

    //

    wiced_i2c_init(&dev) ;

    //

    // Write the initial I2C data which is basically 0x05, 0x01.  This programs

    // a value of 1 into register 5 which give us I2C register control over the

    // LEDs.

    //

    if (wiced_i2c_write(&dev, flags, data, sizeof(data)) != WICED_SUCCESS)

    {

        WPRINT_APP_INFO(("I2C Write Failed\n")) ;

    }

    //

    // Parse the JSON data

    //

    wiced_JSON_parser_register_callback(jsonCallback) ;

    result = wiced_JSON_parser(json_data, sizeof(json_data) - 1) ;

    if (result != WICED_SUCCESS)

    {

        //

        // If this message is printed, you are playing with the JSON data and have

        // changed it in a way that makes the data invalid and therefore it cannot be parsed.

        //

        WPRINT_APP_INFO(("The JSON was not valid and could not be parsed.\n")) ;

    }

    else

    {

        setI2Cleds(i2cleds) ;

        setGPIOleds(gpioleds) ;

    }

}

save_3366371
Level 2
First like received
Level 2

Thanks Alan. Much appreciated.

0 Likes