Minor SPI fixes, systick_callback for STM32F1 HAL compatibility (#19565)

Marlin/src/HAL/STM32/HAL_SPI.cpp

@@ -132,11 +132,9 @@ static SPISettings spiConfig;
    * @details Only configures SS pin since stm32duino creates and initialize the SPI object
    */
   void spiBegin() {
-    #if !PIN_EXISTS(SS)
-      #error "SS_PIN not defined!"
+    #if PIN_EXISTS(SS)
+      OUT_WRITE(SS_PIN, HIGH);
     #endif
-
-    OUT_WRITE(SS_PIN, HIGH);
   }
 
   // Configure SPI for specified SPI speed
@@ -173,9 +171,7 @@ static SPISettings spiConfig;
    * @details
    */
   uint8_t spiRec() {
-    SPI.beginTransaction(spiConfig);
     uint8_t returnByte = SPI.transfer(0xFF);
-    SPI.endTransaction();
     return returnByte;
   }
 
@@ -191,9 +187,7 @@ static SPISettings spiConfig;
   void spiRead(uint8_t* buf, uint16_t nbyte) {
     if (nbyte == 0) return;
     memset(buf, 0xFF, nbyte);
-    SPI.beginTransaction(spiConfig);
     SPI.transfer(buf, nbyte);
-    SPI.endTransaction();
   }
 
   /**
@@ -204,9 +198,7 @@ static SPISettings spiConfig;
    * @details
    */
   void spiSend(uint8_t b) {
-    SPI.beginTransaction(spiConfig);
     SPI.transfer(b);
-    SPI.endTransaction();
   }
 
   /**
@@ -219,10 +211,8 @@ static SPISettings spiConfig;
    */
   void spiSendBlock(uint8_t token, const uint8_t* buf) {
     uint8_t rxBuf[512];
-    SPI.beginTransaction(spiConfig);
     SPI.transfer(token);
     SPI.transfer((uint8_t*)buf, &rxBuf, 512);
-    SPI.endTransaction();
   }
 
 #endif // SOFTWARE_SPI