It cannot use SPI to control TI cc1101 properly.

Question

Hi friend, 
 I am using SDK16.0 and softdevice is S140 7.0.1 version. But SPI can only send out 1 byte. It can't call back the function of spi_event_handler, so my code is locked while checking spi_xfer_done. 
 Can someone help me? My code snippet is below. 
 Thank you in advance. 
 
 static void cc1101_gpio_init(void)
{
 nrf_gpio_pin_dir_set(CC1101A_SS_PIN, NRF_GPIO_PIN_DIR_OUTPUT);
 nrf_gpio_pin_set(CC1101A_SS_PIN);
 nrf_gpio_pin_dir_set(CC1101B_SS_PIN, NRF_GPIO_PIN_DIR_OUTPUT);
 nrf_gpio_pin_set(CC1101B_SS_PIN);

nrf_gpio_pin_dir_set(CC1101A_PWR_PIN, NRF_GPIO_PIN_DIR_OUTPUT);
 nrf_gpio_pin_clear(CC1101A_PWR_PIN);
 nrf_gpio_pin_dir_set(CC1101B_PWR_PIN, NRF_GPIO_PIN_DIR_OUTPUT);
 nrf_gpio_pin_clear(CC1101B_PWR_PIN);
}

void spi_event_handler(nrf_drv_spi_evt_t const * p_event, void *p_context)
{
 spi_xfer_done = true;
}

void cc1101_spi_init(void)
{
 nrf_drv_spi_config_t const spi_config =
 {
 .sck_pin = CC1101_SCK_PIN,
 .mosi_pin = CC1101_MOSI_PIN,
 .miso_pin = CC1101_MISO_PIN,
 .ss_pin = NRF_DRV_SPI_PIN_NOT_USED,
 .irq_priority = SPI_DEFAULT_CONFIG_IRQ_PRIORITY,
 .orc = 0xFF,
 .frequency = NRF_DRV_SPI_FREQ_125K,
 .mode = NRF_DRV_SPI_MODE_0,
 .bit_order = NRF_DRV_SPI_BIT_ORDER_MSB_FIRST
 };

APP_ERROR_CHECK(nrf_drv_spi_init(&m_spi, &spi_config, spi_event_handler, NULL));
}

//|==================== SPI Initialisation for CC1101 =========================|
void cc1101_spi_begin(void)
{
 /* configure SPI */
 cc1101_gpio_init();
 cc1101_spi_init();
}
//-------------------------------[end]------------------------------------------

uint8_t cc1101_spi_putc(uint8_t data)
{
 uint8_t statusByte;

spi_xfer_done = false;
 APP_ERROR_CHECK(nrf_drv_spi_transfer(&m_spi, &data, 1, NULL, 0));
 while(!spi_xfer_done) {}
 spi_xfer_done = false;
 APP_ERROR_CHECK(nrf_drv_spi_transfer(&m_spi, NULL, 0, &statusByte, 1));
 while(!spi_xfer_done) {}
}

//----------------------[CC1101 init functions]---------------------------------
uint8_t cc1101_begin(uint8_t *My_addr)
{
 uint8_t CC1101_freq_select, CC1101_mode_select, CC1101_channel_select;
 uint8_t partnum, version;

cc1101_spi_begin(); //inits SPI Interface
// cc1101_reset(); //CC1101 init cc1101_reset

cc1101_spi_write_strobe(SFTX);nrf_delay_us(100);//flush the TX_fifo content
 cc1101_spi_write_strobe(SFRX);nrf_delay_us(100);//flush the RX_fifo content

partnum = cc1101_spi_read_register(PARTNUM); //reads CC1101 partnumber
 version = cc1101_spi_read_register(VERSION); //reads CC1101 version number

//checks if valid Chip ID is found. Usualy 0x03 or 0x14. if not -> abort
 if(version == 0x00 || version == 0xFF)
 {
 NRF_LOG_INFO("no CC11xx found!");
 return FALSE;
 }

NRF_LOG_INFO("Partnumber:%x", partnum);
 NRF_LOG_INFO("Version:%x", version);

//default settings
 //*My_addr = 0x00;
 CC1101_freq_select = 0x02; //433.92MHz
 CC1101_mode_select = 0x07; //gfsk 9.6kbps
 CC1101_channel_select = 0x00;

//set modulation mode
 cc1101_set_mode(CC1101_mode_select);
 //set ISM band
 cc1101_set_ISM(CC1101_freq_select);
 //set channel
 cc1101_set_channel(CC1101_channel_select);

//set my receiver address
 cc1101_set_myaddr(*My_addr); //set addr
 NRF_LOG_INFO("...done");
 cc1101_receive(); //set CC1101 in cc1101_receive mode
 return TRUE;
}