Hx711 Communication. PPI, SPIM, PWM. How to improve?

Question

Hi, 
 I have implemented a hx711 sensor readout with PPI, using SPIM and PWM peripherals. But for this is needed 4 GPIO and one external OR Gate. I wait for a LOW pulse on AL_SPIM_MISO_PIN, and Read SPI data and disable pulse detect. When SPI RX end, I put and extra pulse in ALT_SPIM_SCK_PIN (I only want Channel A with 128 Gain) and enable again pulse detect.

This is the code: 
 
 static void spi_init_hx711(void) 
{
 nrfx_spim_xfer_desc_t xfer_desc = NRFX_SPIM_XFER_TRX(tx_buffer_spi, LS7366_SPI_BUFFER_SIZE, rx_buffer_spi, LS7366_SPI_BUFFER_SIZE);
 
 nrfx_spim_config_t spi_config = NRFX_SPIM_DEFAULT_CONFIG;
 spi_config.frequency = NRF_SPIM_FREQ_500K;
 spi_config.ss_pin = SPIM_SS_PIN;
 spi_config.miso_pin = SPIM_MISO_PIN;
 spi_config.mosi_pin = SPIM_MOSI_PIN;
 spi_config.sck_pin = SPIM_SCK_PIN;
 ///spi_config.mode = NRF_SPIM_MODE_1;
 spi_config.use_hw_ss = true;
 spi_config.ss_active_high = false;

 
 ret_code_t err_code = nrfx_spim_init(&spi, &spi_config, spim_event_handler, NULL);
 APP_ERROR_CHECK(err_code);

}

void spim_event_handler(nrfx_spim_evt_t const * p_event,
 void * p_context)
{

 if(p_event->type == NRFX_SPIM_EVENT_DONE)
 {
 NRF_LOG_DEBUG("TxDone
");
 NRF_LOG_HEXDUMP_INFO(rx_buffer_spi,LS7366_SPI_BUFFER_SIZE);
 spi_tx_done = true;
 }
 else
 {
 NRF_LOG_DEBUG("Wrong Event
");
 // Something is wrong
 }

}


static void hx711_spi_sampling_event_config()
{
 ret_code_t err_code;
 
 err_code = nrf_drv_ppi_init();
 APP_ERROR_CHECK(err_code);

 uint32_t spi_evt_addr;
 uint32_t spi_task_addr;
 uint32_t data_in_evt_addr;
 uint32_t put_clk_pulses_task_addr;
 uint32_t disable_ppi_channel_start_task_addr;
 uint32_t enable_ppi_channel_group_task_addr;

 
 err_code = nrfx_ppi_channel_alloc(&m_ppi_channel_detect_hx711_start_tx); //Detect TX Ready
 APP_ERROR_CHECK(err_code);

 err_code = nrfx_ppi_channel_alloc(&m_ppi_channel_stop_spi); 
 APP_ERROR_CHECK(err_code);

 err_code = nrfx_ppi_group_alloc(&m_ppi_group_hx711);
 APP_ERROR_CHECK(err_code);

 err_code = nrfx_ppi_channel_include_in_group(m_ppi_channel_detect_hx711_start_tx, NRF_PPI_CHANNEL_GROUP0);
 APP_ERROR_CHECK(err_code);

 data_in_evt_addr = nrfx_gpiote_in_event_addr_get(ALT_SPIM_MISO_PIN); //DATAIN going low detect
 
 static uint16_t seq_values[] ={0};
 
 nrf_pwm_sequence_t const seq =
 {
 .values.p_common = seq_values,
 .length = NRF_PWM_VALUES_LENGTH(seq_values),
 .repeats = 1,
 .end_delay = 0
 };
 
 spi_task_addr = nrfx_spim_start_task_get(&spi); //SPI START task address
 put_clk_pulses_task_addr = nrfx_pwm_simple_playback(&m_pwm1, &seq, 1,
 NRFX_PWM_FLAG_STOP |
 NRFX_PWM_FLAG_START_VIA_TASK);
 disable_ppi_channel_start_task_addr = nrfx_ppi_task_addr_get(NRF_PPI_TASK_CHG0_DIS);
 
 //1ST PPI CHANNEL
 err_code = nrfx_ppi_channel_assign(m_ppi_channel_detect_hx711_start_tx,
 data_in_evt_addr,
 spi_task_addr); //Start SPI RX 
 APP_ERROR_CHECK(err_code);
 err_code = nrfx_ppi_channel_fork_assign(m_ppi_channel_detect_hx711_start_tx,
 disable_ppi_channel_start_task_addr); //Disable DIN Detect
 APP_ERROR_CHECK(err_code);

 
 //2ND PPI CHANNEL
 spi_evt_addr = nrfx_spim_end_event_get(&spi);
 enable_ppi_channel_group_task_addr = nrfx_ppi_task_addr_get(NRF_PPI_TASK_CHG0_EN);
 err_code = nrfx_ppi_channel_assign(m_ppi_channel_stop_spi,
 spi_evt_addr,
 put_clk_pulses_task_addr); //Put Extra pulses
 
 APP_ERROR_CHECK(err_code);
 err_code = nrfx_ppi_channel_fork_assign(m_ppi_channel_stop_spi, enable_ppi_channel_group_task_addr); //Renable MISO go down detection
 APP_ERROR_CHECK(err_code);

}

static void hx711_spi_init()
{
 
 ret_code_t err_code = nrfx_ppi_channel_enable(m_ppi_channel_detect_hx711_start_tx);
 APP_ERROR_CHECK(err_code);

 err_code = nrfx_ppi_group_enable(m_ppi_group_hx711);
 APP_ERROR_CHECK(err_code);

 err_code = nrfx_ppi_channel_enable(m_ppi_channel_stop_spi);
 APP_ERROR_CHECK(err_code);

 nrfx_gpiote_in_event_enable(ALT_SPIM_MISO_PIN, true); 

}

static void pwm_init()
{
 uint32_t err_code;
// Config the pwm to set additional pulses in SPI
 nrfx_pwm_config_t const config1 =
 {
 .output_pins =
 {
 ALT_SPIM_SCK_PIN, // channel 0
 NRFX_PWM_PIN_NOT_USED, // channel 1
 NRFX_PWM_PIN_NOT_USED, // channel 2
 NRFX_PWM_PIN_NOT_USED, // channel 3
 },
 .irq_priority = APP_IRQ_PRIORITY_HIGH,
 .base_clock = NRF_PWM_CLK_2MHz,
 .count_mode = NRF_PWM_MODE_UP,
 .top_value = 1,
 .load_mode = NRF_PWM_LOAD_COMMON,
 .step_mode = NRF_PWM_STEP_AUTO
 };
 err_code = nrfx_pwm_init(&m_pwm1, &config1, NULL);

}

static void spi_prepare_transfer(void)
{
 tx_buffer_spi[0] = 0xAA; //Dont worry about this number
 memset(rx_buffer_spi,0,3);
 nrfx_spim_xfer_desc_t xfer = NRFX_SPIM_XFER_TRX(tx_buffer_spi, 1, rx_buffer_spi, 3);
 uint32_t flags = NRFX_SPIM_FLAG_HOLD_XFER | NRFX_SPIM_FLAG_REPEATED_XFER | NRFX_SPIM_FLAG_NO_XFER_EVT_HANDLER;
 nrfx_spim_xfer(&spi, &xfer, flags);

}

int main(void)
{
 (...)
 
 spi_init_hx711();
 
 pwm_init();
 
 hx711_spi_sampling_event_config();
 
 hx711_spi_init();
 
 (...)
 
 
}

How can i delete the OR Gate, or extra PINs? 
 
 Thank you.