Migrating from arduino to NRF32 platform Using the SES IDE and TWI interface OLED display

[MikeLemon]

Hello, 

I'm trying to start working with the NRF52832 Dev board for quite some time and can't manage to get anything complex done other than blinking an LED and even that can't be achieved without using one of the pre build examples sins it's super hard to start with a blank file and import a library somehow so that is a huge challenge doing that without any proper tutorials what so ever for that very different platform of SOC NFC,Bluetooth and MCU

So before I start I'd love to hear about any proper tutorial series you guys have heard about.

Now I've made a simplified code in arduino that sets the display up and invert the colors in the screen every 500ms and when I run it with my arduino every thing goes great but after moving it to the SDK on SES to the TWI_sensor example making the equivalent modifications and building it without errors the display doesn't seem to respond and when debugging the code seems to run smooth somehow and stopping at the right breaking points.

BTW there's no way it's a wiring problem sins I'm using it with a shield and chcked that the MCU can read it with the TWI_scanner example.

Here's the SES Code:

 

#define SSD1306_SWITCHCAPVCC 0x2

#define SSD1306_SETCONTRAST 0x81
#define SSD1306_DISPLAYALLON_RESUME 0xA4
#define SSD1306_DISPLAYALLON 0xA5
#define SSD1306_NORMALDISPLAY 0xA6
#define SSD1306_INVERTDISPLAY 0xA7
#define SSD1306_DISPLAYOFF 0xAE
#define SSD1306_DISPLAYON 0xAF

#define SSD1306_SETDISPLAYOFFSET 0xD3
#define SSD1306_SETCOMPINS 0xDA

#define SSD1306_SETVCOMDETECT 0xDB

#define SSD1306_SETDISPLAYCLOCKDIV 0xD5
#define SSD1306_SETPRECHARGE 0xD9

#define SSD1306_SETMULTIPLEX 0xA8

#define SSD1306_SETLOWCOLUMN 0x00
#define SSD1306_SETHIGHCOLUMN 0x10

#define SSD1306_SETSTARTLINE 0x40

#define SSD1306_MEMORYMODE 0x20
#define SSD1306_COLUMNADDR 0x21
#define SSD1306_PAGEADDR   0x22

#define SSD1306_COMSCANINC 0xC0
#define SSD1306_COMSCANDEC 0xC8

#define SSD1306_SEGREMAP 0xA0

#define SSD1306_CHARGEPUMP 0x8D

#define SSD1306_EXTERNALVCC 0x1
#define SSD1306_SWITCHCAPVCC 0x2

// Scrolling #defines
#define SSD1306_ACTIVATE_SCROLL 0x2F
#define SSD1306_DEACTIVATE_SCROLL 0x2E
#define SSD1306_SET_VERTICAL_SCROLL_AREA 0xA3
#define SSD1306_RIGHT_HORIZONTAL_SCROLL 0x26
#define SSD1306_LEFT_HORIZONTAL_SCROLL 0x27
#define SSD1306_VERTICAL_AND_RIGHT_HORIZONTAL_SCROLL 0x29
#define SSD1306_VERTICAL_AND_LEFT_HORIZONTAL_SCROLL 0x2A

#include <stdlib.h>

#define OLED_RESET 4
//Adafruit_SSD1306 display(OLED_RESET);


#define SSD1306_128_64

#if defined SSD1306_128_64
  #define SSD1306_LCDWIDTH                  128
  #define SSD1306_LCDHEIGHT                 64
#endif
#if defined SSD1306_128_32
  #define SSD1306_LCDWIDTH                  128
  #define SSD1306_LCDHEIGHT                 32
#endif
#if defined SSD1306_96_16
  #define SSD1306_LCDWIDTH                  96
  #define SSD1306_LCDHEIGHT                 16
#endif

char _i2caddr, _vccstate, sid, sclk, dc, rst, cs;


#include <stdio.h>
#include "boards.h"
#include "app_util_platform.h"
#include "app_error.h"
#include "nrf_drv_twi.h"
#include "nrf_delay.h"


#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"

/* TWI instance ID. */
#define TWI_INSTANCE_ID     0

/* Common addresses definition for temperature sensor. */
#define OLED_ADDRES 0X3C

/*
#define OLED_REG_TEMP      0x00U
#define OLED_REG_CONF      0x01U
#define OLED_REG_THYST     0x02U
#define OLED_REG_TOS       0x03U
*/



/* Mode for OLED. */
#define NORMAL_MODE 0U

/* Indicates if operation on TWI has ended. */
static volatile bool m_xfer_done = false;

/* TWI instance. */
static const nrf_drv_twi_t m_twi = NRF_DRV_TWI_INSTANCE(TWI_INSTANCE_ID);

/* Buffer for samples read from temperature sensor. */
static uint8_t m_sample;

/**
 * @brief Function for setting active mode on MMA7660 accelerometer.
 */
void OLED_set_mode(void)
{
    

    /*

  
    uint8_t reg[2] = {OLED_REG_CONF, NORMAL_MODE};
    err_code = nrf_drv_twi_tx(&m_twi, OLED_ADDR, reg, sizeof(reg), false);
    APP_ERROR_CHECK(err_code);
    while (m_xfer_done == false);

 
    reg[0] = OLED_REG_TEMP;
    m_xfer_done = false;
    err_code = nrf_drv_twi_tx(&m_twi, OLED_ADDR, reg, 1, false);
    APP_ERROR_CHECK(err_code);
    while (m_xfer_done == false);

    */




}

/**
 * @brief Function for handling data from temperature sensor.
 *
 * @param[in] temp          Temperature in Celsius degrees read from sensor.
 */
__STATIC_INLINE void data_handler(uint8_t temp)
{
    NRF_LOG_INFO("Temperature: %d Celsius degrees.", temp);
}

/**
 * @brief TWI events handler.
 */
void twi_handler(nrf_drv_twi_evt_t const * p_event, void * p_context)
{
    switch (p_event->type)
    {
        case NRF_DRV_TWI_EVT_DONE:
            if (p_event->xfer_desc.type == NRF_DRV_TWI_XFER_RX)
            {
                data_handler(m_sample);
            }
            m_xfer_done = true;
            break;
        default:
            break;
    }
}

/**
 * @brief UART initialization.
 */
void twi_init (void)
{
    ret_code_t err_code;

    const nrf_drv_twi_config_t twi_OLED_config = {
       .scl                = ARDUINO_SCL_PIN,
       .sda                = ARDUINO_SDA_PIN,
       .frequency          = NRF_TWI_FREQ_100K,
       .interrupt_priority = APP_IRQ_PRIORITY_HIGH,
       .clear_bus_init     = false
    };

    err_code = nrf_drv_twi_init(&m_twi, &twi_OLED_config, twi_handler, NULL);
    APP_ERROR_CHECK(err_code);

    nrf_drv_twi_enable(&m_twi);
}

/**
 * @brief Function for reading data from temperature sensor.
 */
static void read_sensor_data()
{
    m_xfer_done = false;

    /* Read 1 byte from the specified address - skip 3 bits dedicated for fractional part of temperature. */
    ret_code_t err_code = nrf_drv_twi_rx(&m_twi, OLED_ADDRES, &m_sample, sizeof(m_sample));
    APP_ERROR_CHECK(err_code);
}

/**
 * @brief Function for main application entry.
 */



int main(void)
{
    APP_ERROR_CHECK(NRF_LOG_INIT(NULL));
    NRF_LOG_DEFAULT_BACKENDS_INIT();

    NRF_LOG_INFO("\r\nTWI sensor example");
    NRF_LOG_FLUSH();
    twi_init();
    OLED_set_mode();

    while (true)
    {
        ssd1306_command(SSD1306_INVERTDISPLAY);
        nrf_delay_ms(500); 
        ssd1306_command(SSD1306_NORMALDISPLAY);
        nrf_delay_ms(500); 

        NRF_LOG_FLUSH();
    }
}

/** @} */




void ssd1306_command(char c) {


    /*
    // I2C
    uint8_t control = 0x00;   // Co = 0, D/C = 0
    Wire.beginTransmission(OLED_ADDRES);
    Wire.write(control);
    Wire.write(c);
    Wire.endTransmission();
    
    */

    ret_code_t err_code;
    
    uint8_t control = 0x00;   // Co = 0, D/C = 0

    uint8_t reg[2] = {control, c};
    err_code = nrf_drv_twi_tx(&m_twi, OLED_ADDRES, reg, sizeof(reg), false);
    APP_ERROR_CHECK(err_code);
    while (m_xfer_done == false);

}

And the working arduino Code: 

static uint8_t buffer[] = {
0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80,
0x80, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x80, 0x80, 0xC0, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x80, 0x80, 0x80, 0x80, 0x00, 0x00, 0x80, 0x80, 0x00, 0x00,
0x80, 0xFF, 0xFF, 0x80, 0x80, 0x00, 0x80, 0x80, 0x00, 0x80, 0x80, 0x80, 0x80, 0x00, 0x80, 0x80,
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0xF8, 0xF8, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xE0, 0xE0, 0xC0, 0x80,
0x00, 0xE0, 0xFC, 0xFE, 0xFF, 0xFF, 0xFF, 0x7F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFE, 0xFF, 0xC7, 0x01, 0x01,
0x01, 0x01, 0x83, 0xFF, 0xFF, 0x00, 0x00, 0x7C, 0xFE, 0xC7, 0x01, 0x01, 0x01, 0x01, 0x83, 0xFF,
0xFF, 0xFF, 0x00, 0x38, 0xFE, 0xC7, 0x83, 0x01, 0x01, 0x01, 0x83, 0xC7, 0xFF, 0xFF, 0x00, 0x00,
0x01, 0xFF, 0xFF, 0x01, 0x01, 0x00, 0xFF, 0xFF, 0x07, 0x01, 0x01, 0x01, 0x00, 0x00, 0x7F, 0xFF,
0x80, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0x7F, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x01, 0xFF,
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0x03, 0x0F, 0x3F, 0x7F, 0x7F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xE7, 0xC7, 0xC7, 0x8F,
0x8F, 0x9F, 0xBF, 0xFF, 0xFF, 0xC3, 0xC0, 0xF0, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFC, 0xFC, 0xFC,
0xFC, 0xFC, 0xFC, 0xFC, 0xFC, 0xF8, 0xF8, 0xF0, 0xF0, 0xE0, 0xC0, 0x00, 0x01, 0x03, 0x03, 0x03,
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0x03, 0x01, 0x00, 0x00, 0x00, 0x01, 0x03, 0x03, 0x03, 0x03, 0x01, 0x01, 0x03, 0x03, 0x00, 0x00,
0x00, 0x03, 0x03, 0x00, 0x00, 0x00, 0x03, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
0x03, 0x03, 0x03, 0x03, 0x03, 0x01, 0x00, 0x00, 0x00, 0x01, 0x03, 0x01, 0x00, 0x00, 0x00, 0x03,
0x03, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x80, 0xC0, 0xE0, 0xF0, 0xF9, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x3F, 0x1F, 0x0F,
0x87, 0xC7, 0xF7, 0xFF, 0xFF, 0x1F, 0x1F, 0x3D, 0xFC, 0xF8, 0xF8, 0xF8, 0xF8, 0x7C, 0x7D, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x7F, 0x3F, 0x0F, 0x07, 0x00, 0x30, 0x30, 0x00, 0x00,
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0x00, 0xC0, 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x7F, 0x7F, 0x3F, 0x1F,
0x0F, 0x07, 0x1F, 0x7F, 0xFF, 0xFF, 0xF8, 0xF8, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0xF8, 0xE0,
0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFE, 0xFE, 0x00, 0x00,
0x00, 0xFC, 0xFE, 0xFC, 0x0C, 0x06, 0x06, 0x0E, 0xFC, 0xF8, 0x00, 0x00, 0xF0, 0xF8, 0x1C, 0x0E,
0x06, 0x06, 0x06, 0x0C, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0xFE, 0xFE, 0x00, 0x00, 0x00, 0x00, 0xFC,
0xFE, 0xFC, 0x00, 0x18, 0x3C, 0x7E, 0x66, 0xE6, 0xCE, 0x84, 0x00, 0x00, 0x06, 0xFF, 0xFF, 0x06,
0x06, 0xFC, 0xFE, 0xFC, 0x0C, 0x06, 0x06, 0x06, 0x00, 0x00, 0xFE, 0xFE, 0x00, 0x00, 0xC0, 0xF8,
0xFC, 0x4E, 0x46, 0x46, 0x46, 0x4E, 0x7C, 0x78, 0x40, 0x18, 0x3C, 0x76, 0xE6, 0xCE, 0xCC, 0x80,
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0x00, 0x00, 0x00, 0x00, 0x01, 0x07, 0x0F, 0x1F, 0x1F, 0x3F, 0x3F, 0x3F, 0x3F, 0x1F, 0x0F, 0x03,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0F, 0x0F, 0x00, 0x00,
0x00, 0x0F, 0x0F, 0x0F, 0x00, 0x00, 0x00, 0x00, 0x0F, 0x0F, 0x00, 0x00, 0x03, 0x07, 0x0E, 0x0C,
0x18, 0x18, 0x0C, 0x06, 0x0F, 0x0F, 0x0F, 0x00, 0x00, 0x01, 0x0F, 0x0E, 0x0C, 0x18, 0x0C, 0x0F,
0x07, 0x01, 0x00, 0x04, 0x0E, 0x0C, 0x18, 0x0C, 0x0F, 0x07, 0x00, 0x00, 0x00, 0x0F, 0x0F, 0x00,
0x00, 0x0F, 0x0F, 0x0F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0F, 0x0F, 0x00, 0x00, 0x00, 0x07,
0x07, 0x0C, 0x0C, 0x18, 0x1C, 0x0C, 0x06, 0x06, 0x00, 0x04, 0x0E, 0x0C, 0x18, 0x0C, 0x0F, 0x07,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00

};


#define SSD1306_SWITCHCAPVCC 0x2

#define SSD1306_SETCONTRAST 0x81
#define SSD1306_DISPLAYALLON_RESUME 0xA4
#define SSD1306_DISPLAYALLON 0xA5
#define SSD1306_NORMALDISPLAY 0xA6
#define SSD1306_INVERTDISPLAY 0xA7
#define SSD1306_DISPLAYOFF 0xAE
#define SSD1306_DISPLAYON 0xAF

#define SSD1306_SETDISPLAYOFFSET 0xD3
#define SSD1306_SETCOMPINS 0xDA

#define SSD1306_SETVCOMDETECT 0xDB

#define SSD1306_SETDISPLAYCLOCKDIV 0xD5
#define SSD1306_SETPRECHARGE 0xD9

#define SSD1306_SETMULTIPLEX 0xA8

#define SSD1306_SETLOWCOLUMN 0x00
#define SSD1306_SETHIGHCOLUMN 0x10

#define SSD1306_SETSTARTLINE 0x40

#define SSD1306_MEMORYMODE 0x20
#define SSD1306_COLUMNADDR 0x21
#define SSD1306_PAGEADDR   0x22

#define SSD1306_COMSCANINC 0xC0
#define SSD1306_COMSCANDEC 0xC8

#define SSD1306_SEGREMAP 0xA0

#define SSD1306_CHARGEPUMP 0x8D

#define SSD1306_EXTERNALVCC 0x1
#define SSD1306_SWITCHCAPVCC 0x2

// Scrolling #defines
#define SSD1306_ACTIVATE_SCROLL 0x2F
#define SSD1306_DEACTIVATE_SCROLL 0x2E
#define SSD1306_SET_VERTICAL_SCROLL_AREA 0xA3
#define SSD1306_RIGHT_HORIZONTAL_SCROLL 0x26
#define SSD1306_LEFT_HORIZONTAL_SCROLL 0x27
#define SSD1306_VERTICAL_AND_RIGHT_HORIZONTAL_SCROLL 0x29
#define SSD1306_VERTICAL_AND_LEFT_HORIZONTAL_SCROLL 0x2A

/*********************************************************************
This is an example for our Monochrome OLEDs based on SSD1306 drivers

  Pick one up today in the adafruit shop!
  ------> http://www.adafruit.com/category/63_98

This example is for a 128x64 size display using I2C to communicate
3 pins are required to interface (2 I2C and one reset)

Adafruit invests time and resources providing this open source code, 
please support Adafruit and open-source hardware by purchasing 
products from Adafruit!

Written by Limor Fried/Ladyada  for Adafruit Industries.  
BSD license, check license.txt for more information
All text above, and the splash screen must be included in any redistribution
*********************************************************************/

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <stdlib.h>
//#include <Adafruit_SSD1306.h>
#include"Icons.h"

#define OLED_RESET 4
//Adafruit_SSD1306 display(OLED_RESET);


#define SSD1306_128_64

#if defined SSD1306_128_64
  #define SSD1306_LCDWIDTH                  128
  #define SSD1306_LCDHEIGHT                 64
#endif
#if defined SSD1306_128_32
  #define SSD1306_LCDWIDTH                  128
  #define SSD1306_LCDHEIGHT                 32
#endif
#if defined SSD1306_96_16
  #define SSD1306_LCDWIDTH                  96
  #define SSD1306_LCDHEIGHT                 16
#endif

#define NUMFLAKES 10
#define XPOS 0
#define YPOS 1
#define DELTAY 2

#define OLED_ADDRES 0X3C

int8_t _i2caddr, _vccstate, sid, sclk, dc, rst, cs;


#define LOGO16_GLCD_HEIGHT 16 
#define LOGO16_GLCD_WIDTH  16 
static const unsigned char PROGMEM logo16_glcd_bmp[] =
{ B00000000, B11000000,
  B00000001, B11000000,
  B00000001, B11000000,
  B00000011, B11100000,
  B11110011, B11100000,
  B11111110, B11111000,
  B01111110, B11111111,
  B00110011, B10011111,
  B00011111, B11111100,
  B00001101, B01110000,
  B00011011, B10100000,
  B00111111, B11100000,
  B00111111, B11110000,
  B01111100, B11110000,
  B01110000, B01110000,
  B00000000, B00110000 };

#if (SSD1306_LCDHEIGHT != 64)
#error("Height incorrect, please fix Adafruit_SSD1306.h!");
#endif

void setup()   {                
  //Serial.begin(9600);

  // by default, we'll generate the high voltage from the 3.3v line internally! (neat!)
  Lbegin(SSD1306_SWITCHCAPVCC, OLED_ADDRES);  // initialize with the I2C addr 0x3D (for the 128x64)
  // init done
  
  // Show image buffer on the display hardware.
  // Since the buffer is intialized with an Adafruit splashscreen
  // internally, this will display the splashscreen.
 // Ddisplay();
  delay(1000);

  // Clear the buffer.
  //clearDisplay();
  //Ddisplay();
 
 // display.clearDisplay();

  // draw a bitmap icon and 'animate' movement
  //testdrawbitmap(logo16_glcd_bmp, LOGO16_GLCD_HEIGHT, LOGO16_GLCD_WIDTH);
}


void loop() {

  ssd1306_command(SSD1306_INVERTDISPLAY);
  delay(500); 
  ssd1306_command(SSD1306_NORMALDISPLAY);
  delay(500); 
  
}

void ssd1306_command(uint8_t c) {

    // I2C
    uint8_t control = 0x00;   // Co = 0, D/C = 0
    Wire.beginTransmission(OLED_ADDRES);
    Wire.write(control);
    Wire.write(c);
    Wire.endTransmission();

}

void Lbegin(uint8_t vccstate, uint8_t i2caddr){//, bool reset) {
  _vccstate = vccstate;
  _i2caddr = i2caddr;

    // I2C Init
    Wire.begin();
    /*
  if ((reset) && (rst >= 0)) {
    // Setup reset pin direction (used by both SPI and I2C)
    pinMode(rst, OUTPUT);
    digitalWrite(rst, HIGH);
    // VDD (3.3V) goes high at start, lets just chill for a ms
    delay(1);
    // bring reset low
    digitalWrite(rst, LOW);
    // wait 10ms
    delay(10);
    // bring out of reset
    digitalWrite(rst, HIGH);
    // turn on VCC (9V?)
  }
  */

  // Init sequence
  ssd1306_command(SSD1306_DISPLAYOFF);                    // 0xAE
  ssd1306_command(SSD1306_SETDISPLAYCLOCKDIV);            // 0xD5
  ssd1306_command(0x80);                                  // the suggested ratio 0x80

  ssd1306_command(SSD1306_SETMULTIPLEX);                  // 0xA8
  ssd1306_command(SSD1306_LCDHEIGHT - 1);

  ssd1306_command(SSD1306_SETDISPLAYOFFSET);              // 0xD3
  ssd1306_command(0x0);                                   // no offset
  ssd1306_command(SSD1306_SETSTARTLINE | 0x0);            // line #0
  ssd1306_command(SSD1306_CHARGEPUMP);                    // 0x8D
  if (vccstate == SSD1306_EXTERNALVCC)
    { ssd1306_command(0x10); }
  else
    { ssd1306_command(0x14); }
  ssd1306_command(SSD1306_MEMORYMODE);                    // 0x20
  ssd1306_command(0x00);                                  // 0x0 act like ks0108
  ssd1306_command(SSD1306_SEGREMAP | 0x1);
  ssd1306_command(SSD1306_COMSCANDEC);

//------------------------------------------
  ssd1306_command(SSD1306_SETCOMPINS);                    // 0xDA
  ssd1306_command(0x12);
  ssd1306_command(SSD1306_SETCONTRAST);                   // 0x81
  if (vccstate == SSD1306_EXTERNALVCC)
    { ssd1306_command(0x9F); }
  else
    { ssd1306_command(0xCF); }



  ssd1306_command(SSD1306_SETPRECHARGE);                  // 0xd9
  if (vccstate == SSD1306_EXTERNALVCC)
    { ssd1306_command(0x22); }
  else
    { ssd1306_command(0xF1); }
  ssd1306_command(SSD1306_SETVCOMDETECT);                 // 0xDB
  ssd1306_command(0x40);
  ssd1306_command(SSD1306_DISPLAYALLON_RESUME);           // 0xA4
  ssd1306_command(SSD1306_NORMALDISPLAY);                 // 0xA6

  ssd1306_command(SSD1306_DEACTIVATE_SCROLL);

  ssd1306_command(SSD1306_DISPLAYON);//--turn on oled panel
}

void Ddisplay(void) {
  ssd1306_command(SSD1306_COLUMNADDR);
  ssd1306_command(0);   // Column start address (0 = reset)
  ssd1306_command(SSD1306_LCDWIDTH-1); // Column end address (127 = reset)

  ssd1306_command(SSD1306_PAGEADDR);
  ssd1306_command(0); // Page start address (0 = reset)
//  #if SSD1306_LCDHEIGHT == 64
    ssd1306_command(7); // Page end address
//  #endif
//  #if SSD1306_LCDHEIGHT == 32
//    ssd1306_command(3); // Page end address
//  #endif
//  #if SSD1306_LCDHEIGHT == 16
//    ssd1306_command(1); // Page end address
//  #endif

    // save I2C bitrate
#ifdef TWBR
    uint8_t twbrbackup = TWBR;
    TWBR = 12; // upgrade to 400KHz!
#endif

    //Serial.println(TWBR, DEC);
    //Serial.println(TWSR & 0x3, DEC);

    // I2C
    for (uint16_t i=0; i<(SSD1306_LCDWIDTH*SSD1306_LCDHEIGHT/8); i++) {
      // send a bunch of data in one xmission
      Wire.beginTransmission(OLED_ADDRES);
      Wire.write(0x40);
      for (uint8_t x=0; x<16; x++) {
        Wire.write(buffer[i]);
        i++;
      }
      i--;
      Wire.endTransmission();
    }
    
//#ifdef TWBR
//    TWBR = twbrbackup;
//#endif
}


void clearDisplay(void) {
  memset(buffer, 0, (SSD1306_LCDWIDTH*SSD1306_LCDHEIGHT/8));

}

Some side questions:

1) What's the easiest way to start a code from blank 

2) How to prevent SES from auto saving? every thing I open and mess up a little it gets saved after quitting and then corrupting the file. 

[haakonsh]

Hey Mike,

I'm glad that you've taken the BIG step into embedded engineering. I know It seems incredibly daunting right now as the transition from the Arduino world into the embedded realm is the developer/maker/tinkerer/students equivalent to the Ice-bucket challenge. 

As you have probably noticed nothings seems to "work out of the box" and minuscule changes to seemingly unrelated code have disastrous consequences. Fear not, we've all been there (still am to some degree). The learning curve is steep, there is so much to learn, and you'll not know where to start. I will try to give you some advice and directions. 

 

First off, you cannot focus entirely on you end goal, you need to take baby steps otherwise you will lose motivation and quit.

You need to realize that a "simple" task of transmitting a single byte over I2C/TWI is a very complex operation dependent on a lot of variables, and if you make any assumptions along the way you will regret it later. My job is to chase down the root causes of our customers problems and I know from painful experience how an assumption like: "BTW there's no way it's a wiring problem since I'm using it with a shield and checked that the MCU can read it with the TWI_scanner example", will ruin your week/month. You need to know that the physical signal is transmitted and received correctly. To do that you need a digital analyzer. We've got a Saleae Logic Pro at every desk because we use them frequently, they are easy to use and they're good enough debug data lines at <10MHz. 

There ARE defective products, no matter how simple or complex. Any product will have some small percentage(Parts Per Million) of units that have some sort of defect. It might be our MCU, or the OLED screen, or a power transistor on the OLED board, or a capacitor, or an inductor, or a connector, etc. 

Once you have verified that something works as intended you can take a few moments and appreciate the fact that you are one step closer to your end goal, then start on the next step. Testing and verification is a critical component of engineering and it automatically breaks down tasks into small components. 

 

Secondly, you will have to read, a lot. The nRF52832 Product Specification, the OLED display's datasheet, the nRF5 SDK v14.2.0 documentation and its API Reference, and code. Lots and lots of code. You will have to learn embedded C programming to understand what is going on inside the libraries and drivers. 

You will find our tutorials at https://devzone.nordicsemi.com/tutorials. I suggest you delay doing anything BLE related until you have a better grasp of how to use our SDK documentation, libraries and examples.  

 

Thirdly, you need to use some form of a Version Control system. I suggest Git for programming. This way you can modify your code and not have to worry about ruining your code base or project files. The Segger Embedded Studio project file itself is stored in clear-text which means that it can be processed and saved in Git. 

 

Now to answer your questions:

1. SDK14.2/examples/peripheral/TWI or TWIM. Use this example as a base to begin with. You might want to switch to another base as you gain more knowledge.
2. Version control, version control, version control. Commit often, write good commit messages, use branches.  

Cheers,

Håkon.

[MikeLemon]

Hello haakonsh,

I've went through the Nordic docs countless times and make sure the specific components work with with that particular setup(Used arduino nrf52832 extensions and ST LINK V2 to program it even on my custom PBCs) the tutorial are not helpful either just explaining about how to setup the more complex stuff which I'm sure are easy when you get to that stage after you understand the basics and common idiology of this platform,

Now going through every transistor that makes the IC and programming useful is not that useful either sins it simpley take way too many years I don't have.

So for now I'm just striking that particular problem to be able to move more easily hopefully and integrate the rest and then add the more complex BLE,low power part of the software.

[haakonsh]

I'm not suggesting that you actually start by checking every transistor, etc. What you need to do is to start slow. Can you read the shields device ID?

[MikeLemon]

haakonsh said:

Can you read the shields device ID?

Yes Of course like I said at the beginning I just don't understand why that function doesn't work physically according to that code. the arduino POC algorithm that got converted to SES with the nrf52832 just doesn't work as expected or is it just me not ready understanding that TWI read function properly.

[haakonsh]

Do you have a datasheet for the OLED screen?

 

[MikeLemon]

Ahmmm quite a delay almost became irrelevent.... 

Anyways that is the datasheet if that somehow helps but I'm afraid that's something in the code that I miss.

Anyway not sure here's the link to the OLED driver datasheet: 

cdn-shop.adafruit.com/.../SSD1306.pdf