lt8920_test/modules/bsp/x-nucleo-6180xa1.c

/*
 * @file x-nucleo-6180xa1.c
 * $Date: 2015-10-21 16:55:39 +0200 (Wed, 21 Oct 2015) $
 * $Revision: 2560 $
 */

#include <string.h>

/** Configure VL6180 pins  to Output */
#include "stm32xxx_hal.h"
#ifndef HAL_I2C_MODULE_ENABLED
#define HAL_I2C_MODULE_ENABLED
#pragma message("hal conf should enable i2c")
#endif

#include "x-nucleo-6180xa1.h"

#define V1_CHIP_SWITCH_PORT GPIOA
#define V1_CHIP_SWITCH_PIN  GPIO_PIN_7
#define V1_CHIP_ENABLE_PORT GPIOA
#define V1_CHIP_ENABLE_PIN  GPIO_PIN_5

#define V1_IRQ_PIN          GPIO_PIN_6
#define V2_IRQ_PIN          GPIO_PIN_0

#ifdef __STM32F4xx_HAL_H 
    #define V1_IRQ EXTI9_5_IRQn
    #define V2_IRQ EXTI0_IRQn
#else 
#ifdef __STM32L4xx_HAL_H
    #define V1_IRQ EXTI9_5_IRQn
    #define V2_IRQ EXTI0_IRQn
#else
    #define V1_IRQ EXTI4_15_IRQn
    #define V2_IRQ EXTI0_1_IRQn
#endif
#endif



/* local private prototypes */
static void _V1_GPIO_Init(void);
static void _V1_Set7SegmentDP( int dp);
static void _V1_Set7Segment(uint8_t value);
static void _V1_DisplayOff(void);


static void _V2_GPIO_Init(void);
static int _V2_GetSwicth(void);


#define EXPANDER_I2C_ADDRESS    (0x42*2)
#define GPMR    0x10
#define GPSR    0x12
#define GPDR    0x14



#define V2_D1       (1<<7)
// second byte or word MSB
#define V2_D2       (1<<8)
#define V2_D3       (1<<9)
#define V2_D4       (1<<10)
#define V2_DISP_SEL (1<<11)
#define V2_CHIPEN   (1<<12)
#define V2_CHIPEN_B (1<<13)
#define V2_CHIPEN_L (1<<14)
#define V2_CHIPEN_R (1<<15)

static int IsV2=0;
I2C_HandleTypeDef *_hi2c;
uint16_t _V2PadVal; /* gpio SR value caching to avoid reading on each new bit set */
static int I2cExpAddr=EXPANDER_I2C_ADDRESS;

static int _err=0;

static void _V2_DisplayOff(void);
static void _V2_SetChipEn( int No, int state );



int XNUCLEO6180XA1_IsV2(void){
		return IsV2; 
}



int XNUCLEO6180XA1_EXTI_CallBackHandle(uint16_t GPIO_Pin){
    int IsVL6180XIntPin = IsV2 ?  GPIO_Pin == V2_IRQ_PIN : GPIO_Pin == V1_IRQ_PIN;
    if( IsVL6180XIntPin){
        XNUCLEO6180XA1_UserIntHandler();
    }
    return IsVL6180XIntPin;
}

void XNUCLEO6180XA1_Reset(int state){
    if( !IsV2)
        HAL_GPIO_WritePin(V1_CHIP_ENABLE_PORT, V1_CHIP_ENABLE_PIN , (GPIO_PinState)state);
    else{
        _V2_SetChipEn(0, state);
    }
}


int XNUCLEO6180XA1_ResetId(int state, int id)
{
    int status;
    if( IsV2 && id>=0 && id<4){
        _V2_SetChipEn(id, state);
        status=0;
    }
    else{
    /* Error case */
        status=-1;
    }
    return status;
}

int XNUCLEO6180XA1_GetSwitch(void){
    GPIO_PinState state ;
    if( !IsV2)
        state = HAL_GPIO_ReadPin(V1_CHIP_SWITCH_PORT, V1_CHIP_SWITCH_PIN);
    else{
        state= _V2_GetSwicth() ? GPIO_PIN_SET : GPIO_PIN_RESET ;
    }
    return state;
}

/* public API */
void XNUCLEO6180XA1_GPIO_Init(void) {
//    this must be done after i2c init _V1_GPIO_Init();
}



int V2_ExpanderRd(int  index,  uint8_t *data, int n_data){

    int status;
    uint8_t RegAddr;
    RegAddr=index;

    do{
        status=HAL_I2C_Master_Transmit(_hi2c, I2cExpAddr, &RegAddr, 1, 100);
        if( status )
            break;
        status =HAL_I2C_Master_Receive(_hi2c, I2cExpAddr, data, n_data, n_data*100);
    }while(0);
    return status;
}

int V2_ExpanderWR( int index,  uint8_t *data, int n_data){

    int status;
    uint8_t RegAddr[0x10];
    RegAddr[0]=index;
    memcpy(RegAddr+1, data, n_data);
    status=HAL_I2C_Master_Transmit(_hi2c, I2cExpAddr, RegAddr, n_data+1, 100);
    return status;
}


/**
 *
 * @param No    0= top , 1= Left, 2=Bottom 3=Right
 * @param state
 */
static void _V2_SetChipEn( int No, int state ){
    //int mask = V2_CHIPEN << No;
    int mask = (No==3) ? V2_CHIPEN_R : ((No==2) ? V2_CHIPEN_B : ((No==1) ? V2_CHIPEN_L : V2_CHIPEN));
    if( state)
        _V2PadVal|=mask ;
    else
        _V2PadVal&=~mask;

    V2_ExpanderWR(GPSR, (uint8_t*)&_V2PadVal,2);
}

int _V2_GetSwicth(){
    int status;
    uint16_t Value;
    status=V2_ExpanderRd(GPMR, (uint8_t*)&Value,2);

    if(status ==0 ){
        Value&=V2_DISP_SEL;
    }
    else{
        //TODO ("VL6180x Expander rd fail");
        _err++;
        Value=0;
    }
    return Value;
}

static void _I2cFailRecover(){
    GPIO_InitTypeDef GPIO_InitStruct;
    int i, nRetry=0;


    // We may get reset after in middle of an i2c access (h/w reset button use or debug load)
    // hence some agent on bus may be in middle of a a transaction and will create issue or even prevent starting (SDA is low)
    // We can't assume bus state based on SDA and SCL state (we may be in a data or NAk bit so SCL=SDA=1)
    // by setting SDA high and toggling SCL at least 10 time we ensure whatever agent and state
    // all agent will end up seeing a "stop" end bus we back to an known idle i2c  bus state

    // Enable I/O
    __GPIOB_CLK_ENABLE();
    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_8, GPIO_PIN_SET);
    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_9, GPIO_PIN_SET);
    GPIO_InitStruct.Pin = GPIO_PIN_8|GPIO_PIN_9 ;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_OD;
    GPIO_InitStruct.Pull = GPIO_PULLUP;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
    //TODO we could do this faster by not using HAL delay 1ms for clk timing
    do{
        for( i=0; i<10; i++){
            HAL_GPIO_WritePin(GPIOB, GPIO_PIN_8, GPIO_PIN_RESET);
            HAL_Delay(1);
            HAL_GPIO_WritePin(GPIOB, GPIO_PIN_8, GPIO_PIN_SET);
            HAL_Delay(1);
        }
//        if( HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_9) == 0 ){
//            static int RetryRecover;
//            RetryRecover++;
//        }
    }while(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_9) == 0 && nRetry++<7);

    if( HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_9) == 0 ){
        __GPIOA_CLK_ENABLE();
        //We are still in bad i2c state warm user by blinking led but stay here
        GPIO_InitStruct.Pin = GPIO_PIN_5 ;
        GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
        GPIO_InitStruct.Pull = GPIO_NOPULL;
        HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
        do{
            HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_SET);
            HAL_Delay(33);
            HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_RESET);
            HAL_Delay(33);
            HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_SET);
            HAL_Delay(33);
            HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_RESET);
            HAL_Delay(33*20);
        }while(1);
    }
}

/**
 * F401 valid may not work for over device
 */
void XNUCLEO6180XA1_I2C1_Init(I2C_HandleTypeDef *hi2c1) {
    GPIO_InitTypeDef GPIO_InitStruct;
    uint8_t ExpanderID[2];

    int status;

    _I2cFailRecover();
    /* Peripheral clock enable */
    __GPIOB_CLK_ENABLE();
    __I2C1_CLK_ENABLE();
    /**I2C1 GPIO Configuration
     PB8     ------> I2C1_SCL
     PB9     ------> I2C1_SDA
     */
    GPIO_InitStruct.Pin = GPIO_PIN_8 | GPIO_PIN_9;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
    GPIO_InitStruct.Pull = GPIO_PULLUP;
    GPIO_InitStruct.Speed = GPIO_SPEED_LOW;
    GPIO_InitStruct.Alternate = GPIO_AF4_I2C1;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

    hi2c1->Instance = I2C1;
#ifdef __STM32F4xx_HAL_H
    hi2c1->Init.ClockSpeed = 400000;
    hi2c1->Init.DutyCycle = I2C_DUTYCYCLE_2;
#else 
    hi2c1->Init.Timing = 0x00300F38; /* set 400KHz fast mode i2c*/
#endif
    hi2c1->Init.OwnAddress1 = 0;
    hi2c1->Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
    hi2c1->Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
    hi2c1->Init.OwnAddress2 = 0;
    hi2c1->Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
    hi2c1->Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
    
    HAL_I2C_Init(hi2c1);
    
    
    /* try to detect v1 v2 by reading i2c expander register
     *  if rd i2c fail assume it is a v1 shield it may be a v2 with an i2c bus hangs (happen some time)*/
    _hi2c=hi2c1;
    status = V2_ExpanderRd( 0, ExpanderID, 2);
    if( status == 0 && ExpanderID[0]==0 && ExpanderID[1]==0x16){
        IsV2=1;
        _V2_GPIO_Init();
    }
    else{
        _V1_GPIO_Init();
    }
}

/**
 * @brief Default  do nothing interrupt callback
 */
#pragma weak XNUCLEO6180XA1_UserIntHandler
void  XNUCLEO6180XA1_UserIntHandler(void)  {
}

void XNUCLEO6180XA1_ClearInterrupt(void){
    if( !IsV2 )
        NVIC_ClearPendingIRQ(V1_IRQ);
    else
        NVIC_ClearPendingIRQ(V2_IRQ);
}


void XNUCLEO6180XA1_DisableInterrupt(void){
    if( !IsV2){
        HAL_NVIC_DisableIRQ(V1_IRQ);
        __HAL_GPIO_EXTI_CLEAR_IT(V1_IRQ_PIN);
        NVIC_ClearPendingIRQ(V1_IRQ);
    }
    else{
        HAL_NVIC_DisableIRQ(V2_IRQ);
        __HAL_GPIO_EXTI_CLEAR_IT(V2_IRQ_PIN);
        NVIC_ClearPendingIRQ(V2_IRQ);
    }

}
void XNUCLEO6180XA1_EnableInterrupt(void){
    if( !IsV2 ){
        __HAL_GPIO_EXTI_CLEAR_IT(V1_IRQ_PIN);
        NVIC_ClearPendingIRQ(V1_IRQ);
        HAL_NVIC_EnableIRQ(V1_IRQ);
    }
    else{
        __HAL_GPIO_EXTI_CLEAR_IT(V2_IRQ_PIN);
        NVIC_ClearPendingIRQ(V2_IRQ);
        HAL_NVIC_EnableIRQ(V2_IRQ);
    }

}

/**
 * Display digit enable pad/pin LUT
 * D1 is left most digit  (ms nibble) on the display
 * D3 is right most digit (ls nibble) on the display
 */
#define PA  0
#define PB  1
#define PC  2
#define MAKE_PAD(port, pin)  (((port)<<4)|pin)

/* digit enable pad/pin LUT  */
static uint8_t DisplayEn[] = {
    MAKE_PAD( PB, 0), /* D1 0 */
    MAKE_PAD( PA, 4), /* D2 1 */
    MAKE_PAD( PA, 1), /* D3 2 */
    MAKE_PAD( PA, 0), /* D4 3 */
};

/* 7 segment code to pad/pin LUT  */
static uint8_t DisplaySeg[] = {
        MAKE_PAD( PB, 6 ), /* 0 A  */
        MAKE_PAD( PC, 7 ), /* 1 B  */
        MAKE_PAD( PA, 9 ), /* 2 C  */
        MAKE_PAD( PA, 8 ), /* 3 D  */
        MAKE_PAD( PB, 10), /* 4 E  */
        MAKE_PAD( PB, 4 ), /* 5 F  */
        MAKE_PAD( PB, 5 ), /* 6 G  */
        MAKE_PAD( PB, 3 ), /* 7 DP */
        /* Note that PB3 these is conflicting wit jtag/SWO used for trace
         * activating PB3 as ooutput will prevent trace to work  */
};
#undef MAKE_PAD
#undef PA
#undef PB
#undef PC

#define pad_write(pad, state)   HAL_GPIO_WritePin( (GPIO_TypeDef*)((char*)GPIOA + (pad>>4)*((char*)GPIOB-(char*)GPIOA)), 1<<(pad&0x0F), state);

/*
   --s0--
   s    s
   5    1
   --s6--
   s    s
   4    2
   --s3-- s7

 */

#define DP  (1<<7)
#define NOT_7_NO_DP( ... ) (uint8_t) ~( __VA_ARGS__ + DP )
#define S0 (1<<0)
#define S1 (1<<1)
#define S2 (1<<2)
#define S3 (1<<3)
#define S4 (1<<4)
#define S5 (1<<5)
#define S6 (1<<6)

/* refer to http://www.twyman.org.uk/Fonts/ */
static const uint8_t ascii_to_display_lut[256]={
      [' ']=           0,
      ['-']=           S6,
      ['_']=           S3,
      ['=']=           S3+S6,
      ['~']=           S0+S3+S6, /* 3 h bar */
      ['^']=           S0, /* use as top bar */

      ['?']=           NOT_7_NO_DP(S5+S3+S2),
      ['*']=           NOT_7_NO_DP(),
      ['[']=           S0+S3+S4+S5,
      [']']=           S0+S3+S2+S1,
      ['@']=           S0+S3,

      ['0']=           NOT_7_NO_DP(S6),
      ['1']=           S1+S2,
      ['2']=           S0+S1+S6+S4+S3,
      ['3']=           NOT_7_NO_DP(S4+S5),
      ['4']=           S5+S1+S6+S2,
      ['5']=           NOT_7_NO_DP(S1+S4),
      ['6']=           NOT_7_NO_DP(S1),
      ['7']=           S0+S1+S2,
      ['8']=           NOT_7_NO_DP(0),
      ['9']=           NOT_7_NO_DP(S4),
    
      ['a']=           S2+ S3+ S4+ S6 ,
      ['b']=           NOT_7_NO_DP(S0+S1),
      ['c']=           S6+S4+S3,
      ['d']=           NOT_7_NO_DP(S0+S5),
      ['e']=           NOT_7_NO_DP(S2),
      ['f']=           S6+S5+S4+S0, /* same as F */
      ['g']=           NOT_7_NO_DP(S4), /* same as 9 */
      ['h']=           S6+S5+S4+S2,
      ['i']=           S4,
      ['j']=           S1+S2+S3+S4,
      ['k']=           S6+S5+S4+S2, /* a h */
      ['l']=           S3+S4,
      ['m']=           S0+S4+S2, /* same as  */
      ['n']=           S2+S4+S6,
      ['o']=           S6+S4+S3+S2,
      ['p']=           NOT_7_NO_DP(S3+S2), // same as P
      ['q']=           S0+S1+S2+S5+S6,
      ['r']=           S4+S6,
      ['s']=           NOT_7_NO_DP(S1+S4),
      ['t']=           NOT_7_NO_DP(S0+S1+S2),
      ['u']=           S4+S3+S2+S5+S1, // U
      ['v']=           S4+S3+S2, // is u but u use U
      ['w']=           S1+S3+S5,
      ['x']=           NOT_7_NO_DP(S0+S3), // similar to H
      ['y']=           NOT_7_NO_DP(S0+S4),
      ['z']=           S0+S1+S6+S4+S3, // same as 2
      
      ['A']=           NOT_7_NO_DP(S3),
      ['B']=           NOT_7_NO_DP(S0+S1), /* as b  */
      ['C']=           S0+S3+S4+S5, // same as [
      ['E']=           NOT_7_NO_DP(S1+S2),
      ['F']=           S6+S5+S4+S0,
      ['G']=           NOT_7_NO_DP(S4), /* same as 9 */
      ['H']=           NOT_7_NO_DP(S0+S3),
      ['I']=           S1+S2,
      ['J']=           S1+S2+S3+S4,
      ['K']=           NOT_7_NO_DP(S0+S3), /* same as H */
      ['L']=           S3+S4+S5,
      ['M']=           S0+S4+S2, /* same as  m*/
      ['N']=           S2+S4+S6, /* same as n*/
      ['O']=           NOT_7_NO_DP(S6),
      ['P']=           S0+S1+S2+S5+S6, // sames as 'q'
      ['Q']=           NOT_7_NO_DP(S3+S2),
      ['R']=           S4+S6,
      ['S']=           NOT_7_NO_DP(S1+S4), /* sasme as 5 */
      ['T']=           NOT_7_NO_DP(S0+S1+S2), /* sasme as t */
      ['U']=           NOT_7_NO_DP(S6+S0),
      ['V']=           S4+S3+S2, // is u but u use U
      ['W']=           S1+S3+S5,
      ['X']=           NOT_7_NO_DP(S0+S3), // similar to H
      ['Y']=           NOT_7_NO_DP(S0+S4),
      ['Z']=           S0+S1+S6+S4+S3, // same as 2


};

#undef S0
#undef S1
#undef S2
#undef S3
#undef S4
#undef S5
#undef S6
#undef DP


static void _V1_DisplayString(const char *str, int SegDelayMs){
    int i;
    const char *pc;
    for( i=0, pc=str; i<4 && *pc!=0 ; i++, pc++){
        _V1_Set7Segment( ascii_to_display_lut[(uint8_t)*pc]);
        if( *(pc+1)== '.'){
            _V1_Set7SegmentDP(1);
            pc++;
        }
        /* digit on */
        pad_write(DisplayEn[i], GPIO_PIN_RESET); /* activate led */
        XNUCLEO6180XA1_WaitMilliSec(SegDelayMs);
        /* digit off */
        pad_write(DisplayEn[i], GPIO_PIN_SET); /* turn off led */
    }
}

static  void _V2_Set7Segment( int Leds, int digit ){
    _V2PadVal |= 0x7F; /* clear 7 seg bits */
    _V2PadVal |= V2_D1|V2_D2|V2_D3|V2_D4; /* all segment off */
    _V2PadVal &= ~(V2_D1<<digit);         /* digit on */
    _V2PadVal &= ~(Leds&0x7F);
    V2_ExpanderWR(GPSR, (uint8_t*)&_V2PadVal, 2);
}


static  void _V2_DisplayString(const char *str, int SegDelayMs){
    int i;
    const char *pc;

    for( i=0, pc=str; i<4 && *pc!=0 ; i++, pc++){
        _V2_Set7Segment( ascii_to_display_lut[(uint8_t)*pc], i);
        if( *(pc+1)== '.'){
            pc++;
        }
        XNUCLEO6180XA1_WaitMilliSec(SegDelayMs);
        _V2_DisplayOff();
    }
}

/**
 * accept . on any digit
 */
void XNUCLEO6180XA1_DisplayString(const char *str, int SegDelayMs){
    if( !IsV2)
        _V1_DisplayString(str, SegDelayMs);
    else
        _V2_DisplayString(str, SegDelayMs);
 }




static void _V1_GPIO_Init(void) {

    GPIO_InitTypeDef GPIO_InitStruct;

    /* GPIO Ports Clock Enable */
    __GPIOC_CLK_ENABLE();
    __GPIOH_CLK_ENABLE();
    __GPIOA_CLK_ENABLE();
    __GPIOB_CLK_ENABLE();


    /*Configure GPIO pins : PA0 PA1 PA4 PA5 PA8 PA9 */
    GPIO_InitStruct.Pin = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_4 | GPIO_PIN_5 | GPIO_PIN_8 | GPIO_PIN_9;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_LOW;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    /*Configure GPIO pins : PA7 select  */
    GPIO_InitStruct.Pin = GPIO_PIN_7;
    GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);


    /*Configure GPIO pins : PA6 interrupt */
    GPIO_InitStruct.Pin = GPIO_PIN_6;
    GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    /*Configure GPIO pins : PB0 PB10 PB3 PB4 PB5  PB6 */
    GPIO_InitStruct.Pin = GPIO_PIN_0 | GPIO_PIN_10 | GPIO_PIN_4 | GPIO_PIN_5 | GPIO_PIN_6;
#ifndef OS_USE_TRACE_ITM
    GPIO_InitStruct.Pin |=  GPIO_PIN_3;
#endif
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_LOW;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);



    /*Configure GPIO pin : PC7 7 segment  B */
    GPIO_InitStruct.Pin = GPIO_PIN_7;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_LOW;
    HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
    /* turn off all 7 seg digit */
    _V1_DisplayOff();
}



static void _V2_GPIO_Init(){
    uint16_t PadDir;

    GPIO_InitTypeDef GPIO_InitStruct;

    __GPIOA_CLK_ENABLE();
    __GPIOB_CLK_ENABLE();
    
    /*Configure GPIO pins interrupt PA4 = INTB , PA5 = INTL, pA10 = INTR */
    GPIO_InitStruct.Pin = GPIO_PIN_4 | GPIO_PIN_5 |GPIO_PIN_10 ;
    GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);


    /* PB0 = INT */
    GPIO_InitStruct.Pin = GPIO_PIN_0;
    GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

    /* expender config */
    PadDir=~V2_DISP_SEL;
    V2_ExpanderWR(GPDR, (uint8_t*)&PadDir, 2);

    _V2_DisplayOff();

}

static void _V2_DisplayOff() {
    _V2PadVal |= (V2_D1|V2_D2|V2_D3| V2_D4); /* segment en off */
    V2_ExpanderWR(GPSR, (uint8_t*)&_V2PadVal, 2);
}

static void _V1_DisplayOff() {
    int i;
    for( i=0; i<4; i++ ){
        pad_write(DisplayEn[i], GPIO_PIN_SET); /* turn off led */
    }
}

/* set 7 segment bus to display decode "value" */
static void _V1_Set7Segment(const uint8_t value) {
    int i;
    GPIO_PinState state;
    for (i = 0; i < sizeof(DisplaySeg)/sizeof(DisplaySeg[0]); i++) {
        int cur_bit;
        cur_bit = value & (1 << i);
        state = cur_bit ?  GPIO_PIN_RESET: GPIO_PIN_SET; /* port clear= segment on */
        pad_write(DisplaySeg[i], state);
    }
}

/* set state of decimal point on 7 segment bus */
static void _V1_Set7SegmentDP( int dp_state) {
    GPIO_PinState state;


    state = dp_state ?  GPIO_PIN_RESET: GPIO_PIN_SET; // port clear= segment on
    pad_write(DisplaySeg[7], state);
    //HAL_GPIO_WritePin((void*)GPIOA + DisplaySeg[7].port*((void*)GPIOB-(void*)GPIOA), 1<<DisplaySeg[7].pin, state);
}