How to use nrf52 interface through ordinary method in image transfer demo?

Question

Hello,

I'm going to use nrf52-ble-image-transfer-demo-master for my application. But demo used other way with cpp code for configuring nrf52832 interfaces(spi, twi, gpio...) I hope to use ordinary library and function, but for example if I configure spi like below

sdk_config.h

// <e> SPI_ENABLED - nrf_drv_spi - SPI/SPIM peripheral driver
//==========================================================
#ifndef SPI_ENABLED
#define SPI_ENABLED 1
#endif
#if  SPI_ENABLED
// <o> SPI_DEFAULT_CONFIG_IRQ_PRIORITY  - Interrupt priority
 

// <i> Priorities 0,2 (nRF51) and 0,1,4,5 (nRF52) are reserved for SoftDevice
// <0=> 0 (highest) 
// <1=> 1 
// <2=> 2 
// <3=> 3 
// <4=> 4 
// <5=> 5 
// <6=> 6 
// <7=> 7 

#ifndef SPI_DEFAULT_CONFIG_IRQ_PRIORITY
#define SPI_DEFAULT_CONFIG_IRQ_PRIORITY 7
#endif

// <e> SPI0_ENABLED - Enable SPI0 instance
//==========================================================
#ifndef SPI0_ENABLED
#define SPI0_ENABLED 1
#endif
#if  SPI0_ENABLED
// <q> SPI0_USE_EASY_DMA  - Use EasyDMA
 

#ifndef SPI0_USE_EASY_DMA
#define SPI0_USE_EASY_DMA 1
#endif

// <o> SPI0_DEFAULT_FREQUENCY  - SPI frequency
 
// <33554432=> 125 kHz 
// <67108864=> 250 kHz 
// <134217728=> 500 kHz 
// <268435456=> 1 MHz 
// <536870912=> 2 MHz 
// <1073741824=> 4 MHz 
// <2147483648=> 8 MHz 

#ifndef SPI0_DEFAULT_FREQUENCY
#define SPI0_DEFAULT_FREQUENCY 1073741824
#endif

#endif //SPI0_ENABLED
// </e>

main.c

#include "nrf_drv_spi.h"

// SPI //
#define SPI_INSTANCE  0 /**< SPI instance index. */
static const nrf_drv_spi_t spi = NRF_DRV_SPI_INSTANCE(SPI_INSTANCE);  /**< SPI instance. */
static volatile bool spi_xfer_done;  /**< Flag used to indicate that SPI instance completed the transfer. */
static uint8_t m_tx_buf[256];           /**< TX buffer. */
static uint8_t m_rx_buf[256];    /**< RX buffer. */

/**
 * @brief SPI user event handler.
 * @param event
 */
void spi_event_handler(nrf_drv_spi_evt_t const* p_event, void* p_context){
    spi_xfer_done = true;
}

void spi_init(){
    nrf_drv_spi_config_t spi_config = NRF_DRV_SPI_DEFAULT_CONFIG;
    spi_config.ss_pin   = 1;
    spi_config.miso_pin = 2;
    spi_config.mosi_pin = 3;
    spi_config.sck_pin  = 4;
    APP_ERROR_CHECK(nrf_drv_spi_init(&spi, &spi_config, spi_event_handler, NULL));
}

I get errors like

*** Using Compiler 'V5.06 (build 20)', folder: 'C:\Keil_v5\ARM\ARMCC\Bin'
Build target 'nrf52832_xxaa'
compiling main.c...
..\..\..\main.c(82): error:  #29: expected an expression
  static const nrf_drv_spi_t spi = 
RF_DRV_SPI_INSTANCE(SPI_INSTANCE);  /**< SPI instance. */
..\..\..\main.c(82): error:  #29: expected an expression
  static const nrf_drv_spi_t spi = 
RF_DRV_SPI_INSTANCE(SPI_INSTANCE);  /**< SPI instance. */
..\..\..\main.c(82): error:  #29: expected an expression
  static const nrf_drv_spi_t spi = 
RF_DRV_SPI_INSTANCE(SPI_INSTANCE);  /**< SPI instance. */
..\..\..\main.c(82): error:  #29: expected an expression
  static const nrf_drv_spi_t spi = 
RF_DRV_SPI_INSTANCE(SPI_INSTANCE);  /**< SPI instance. */
..\..\..\main.c(96): error:  #29: expected an expression
      nrf_drv_spi_config_t spi_config = 
RF_DRV_SPI_DEFAULT_CONFIG;
..\..\..\main.c(96): error:  #29: expected an expression
      nrf_drv_spi_config_t spi_config = 
RF_DRV_SPI_DEFAULT_CONFIG;
..\..\..\main.c(96): error:  #29: expected an expression
      nrf_drv_spi_config_t spi_config = 
RF_DRV_SPI_DEFAULT_CONFIG;
..\..\..\main.c(96): error:  #29: expected an expression
      nrf_drv_spi_config_t spi_config = 
RF_DRV_SPI_DEFAULT_CONFIG;
..\..\..\main.c(96): error:  #29: expected an expression
      nrf_drv_spi_config_t spi_config = 
RF_DRV_SPI_DEFAULT_CONFIG;
..\..\..\main.c(96): error:  #29: expected an expression
      nrf_drv_spi_config_t spi_config = 
RF_DRV_SPI_DEFAULT_CONFIG;
..\..\..\main.c(96): error:  #29: expected an expression
      nrf_drv_spi_config_t spi_config = 
RF_DRV_SPI_DEFAULT_CONFIG;
..\..\..\main.c(96): error:  #29: expected an expression
      nrf_drv_spi_config_t spi_config = 
RF_DRV_SPI_DEFAULT_CONFIG;
..\..\..\main.c(96): error:  #29: expected an expression
      nrf_drv_spi_config_t spi_config = 
RF_DRV_SPI_DEFAULT_CONFIG;
..\..\..\main.c(84): warning:  #177-D: variable "m_tx_buf" was declared but never referenced
  static uint8_t m_tx_buf[256];           /**< TX buffer. */
..\..\..\main.c(85): warning:  #177-D: variable "m_rx_buf" was declared but never referenced
  static uint8_t m_rx_buf[256];    /**< RX buffer. */
..\..\..\main.c: 2 warnings, 13 errors
".\_build\nrf52832_xxaa.axf" - 13 Error(s), 2 Warning(s).
Target not created.
Build Time Elapsed:  00:00:02

How can I use nrf52 interface through ordinary method? I'm using nrf52832 DK.