Diff: DMA_SPI.cpp

Revision:

10:5b96211275d4

Parent:

9:9ed9dffd602a

Child:

11:366f1186c121

--- a/DMA_SPI.cpp	Thu Mar 07 01:16:48 2019 +0000
+++ b/DMA_SPI.cpp	Fri Mar 08 01:33:51 2019 +0000
@@ -201,29 +201,40 @@
    SET_DMA1_CH3_CCR_PL_BITS();                                                  //Priority Level = Highest
                       
     DMA1_Channel3->CNDTR = 12;                                                 //number of data to transfer from memory to the peripheral
-    DMA1_Channel3->CPAR = (int32_t)&SPI1->DR;                                   //Destination address = SPI data register
-    DMA1_Channel3->CMAR = (int32_t)data_to_transmit;                            //Source address = data_to_transmit
+    DMA1_Channel3->CPAR = (uint32_t)&SPI1->DR;                                   //Destination address = SPI data register
+    DMA1_Channel3->CMAR = (uint32_t)data_to_transmit;                            //Source address = data_to_transmit
 //-----------------------------------------------Transmission------------------------------------------------    
     
     
-  //  NVIC->ISER[0]|= (1u<<12);                                                   //Enable DMA1 channel 2 interrupt                                                   
-  //  NVIC->ISER[0]|= (1u<<13);                                                   //Enable DMA1 channel 3 interrupt
-  //  NVIC_EnableIRQ(DMA1_Channel2_IRQn);
-  //  NVIC_EnableIRQ(DMA1_Channel3_IRQn);
+   // NVIC->ISER[0] |= (1u<<12);                                                   //Enable DMA1 channel 2 interrupt                                                   
+    NVIC->ISER[0] |= (1u<<13);                                                   //Enable DMA1 channel 3 interrupt
+   // NVIC_EnableIRQ(DMA1_Channel2_IRQn);
+    NVIC_EnableIRQ(DMA1_Channel3_IRQn);
                       
 }
 
 
 //Interrupt Handler for DMA1 Channel 2
-void DMA1_Channel2_IRQHandler(void) {
+extern "C" void DMA1_Channel2_IRQHandler(void) {
      myled = 0;                                                                 //Toggle LED off
      CLEAR_DMA1_CH2_IFCR_GFLAG();                                               //Clear Global Interrupt flag
 }
 
 
 //Interrupt Handler for DMA1 Channel 3
-void DMA1_Channel3_IRQHandler(void) {
+extern "C" void DMA1_Channel3_IRQHandler(void) {
+     if(myled == 1) {
      myled = 0;  
-     CLEAR_DMA1_CH3_IFCR_GFLAG();                                               //Clear Global Interrupt flag             
+     }
+     else {
+         myled = 1;
+        }
+    if(DMA1->ISR&(1u<<9)) {                                                    //Check whteher data transmit transfer is complete  
+        //Read data from the array that stores received data
+        for(int x = 0; x <= 12; x++) {
+            data_to_transmit[x] = x+1;
+        }
+        CLEAR_DMA1_CH3_IFCR_GFLAG();                                            //Clear global channel interrupt flag for channel 3
+     }                                            //Clear Global Interrupt flag             
 }