exploring-spi-communication-with-stm32-using-pll-it-dma-Slave

#include "main.h"
#include "LiquidCrystal.h"

uint8_t rxBuffer;
char RX1[20];
char RX2[20];

int main(void)
{
  HAL_Init();
  SystemClock_Config();
  MX_GPIO_Init();
  MX_DMA_Init();
  MX_SPI1_Init();

LiquidCrystal(GPIOB,GPIO_PIN_9,GPIO_PIN_10,GPIO_PIN_11,GPIO_PIN_12,
GPIO_PIN_13,GPIO_PIN_14,GPIO_PIN_15);
begin(16,2);

while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
    // Receive Polling MODE
  if(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_5)==GPIO_PIN_SET)
  {
    HAL_SPI_Receive(&hspi1, (uint8_t*)RX1, sizeof(RX1),5000);
    setCursor(0, 0);
    print("SPI Polling Mode");
    setCursor(0, 1);
    print(RX1);
    HAL_Delay(1000);
    clear();
  }
  //Receive IT MODE
  else if(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_6)==GPIO_PIN_SET)
     {
       HAL_SPI_Receive_IT(&hspi1, &rxBuffer, 1);
       setCursor(0, 0);
       print("SPI IT Mode");
       HAL_Delay(1000);
       clear();
     }
  else if(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_7)==GPIO_PIN_SET)
     {
       HAL_SPI_Receive_DMA(&hspi1, (uint8_t*)RX2,sizeof(RX2));
       setCursor(0, 0);
       print("SPI DMA Mode");
       setCursor(0, 1);
       print(RX2);
       HAL_Delay(1000);
       clear();
     }
  else
  {
    setCursor(0, 0);
    print("SLAVE Ready");
    setCursor(0, 1);
    print("TO Receive");
    HAL_SPI_Abort(&hspi1);
    HAL_SPI_Abort_IT(&hspi1);
    HAL_SPI_DMAStop(&hspi1);
    HAL_Delay(1000);
    clear();
}}}