Configuration UART on Intel Galileo

bonus153624 · **Joined:** Sat Dec 17, 2016 6:47 am **Posts:** 1

Hey everyone,
I came with a question,
i tried to configure UART port on Intel Galileo, to be able to write and read through PUTTY, here is my code:

Code:

//Turn on UART
   RegAddr DMA_CFG;
   DMA_CFG.raw = 0;

   DMA_CFG.bus = 0;
   DMA_CFG.dev = 20;
   DMA_CFG.func = 1;
   DMA_CFG.reg_off = 0x14;
   DMA_CFG.en_mapping = 1;
   UINT32 * DMA_addr = getAddressFromPCI(DMA_CFG.raw | 0x80000000);   

   DMA_addr[0] = 0x01;

   //Get BAR0
   RegAddr BAR0;
   BAR0.raw = 0;
   
   BAR0.bus = 0;
   BAR0.dev = 20;
   BAR0.func = 1;
   BAR0.reg_off = 0x10;   
   BAR0.en_mapping = 1;

   UINT32 BAR0_addr = getAddressFromPCI(BAR0.raw | 0x80000000);   

   //Turn on DDL register
   UINT32 * LCR = BAR0_addr + 0xC;
   LCR[0] = 0x80;
   //Set DDL regisrer
   UINT32 * RBR_THR_DLL = BAR0_addr;
   RBR_THR_DLL[0] = 0x18;
   
   //Set IIR
   UINT32 * IIR_FCR = BAR0_addr + 0x8;
   IIR_FCR[0] = 0x01;
   //Turn on IIR register
   LCR[0] = 0x0;
   
   //Clear IER register
   UINT32 * IER_DLH = BAR0_addr + 0x4;
   IER_DLH[0] = 0x0;   
   
   UINT32 * LSR = BAR0_addr + 0x14;

   while(TRUE) {
      UINT32 lsr_data = LSR[0] & 0x20;
      if (lsr_data == 0x20)
         break;
      
   }

   RBR_THR_DLL[0] = 's';

but it does not work. I put a character in THR register but it did not comes up. I tried to follow specifications of Intel Quark SoC X1000 but i am not sure that i understood all of that informations.

Thanks in advance for Your answers

adsko · **Joined:** Thu Dec 08, 2016 12:32 pm **Posts:** 5

If you try to enable pooling mode, you don't need DMA_CFG.
Config:

Code:

   //Get IER_DLH
   UINT32 * IER_DLH = BAR0_addr + 0x4;

   //Turn on DDL register
   UINT32 * LCR = BAR0_addr + 0xC;
   LCR[0] = 0x80;

   //Set DDL regisrer
   RBR_THR_DLL = BAR0_addr;
   RBR_THR_DLL[0] = 0x18;

   //Turn off DLAB
   LCR[0] = 0x03;
   UINT32 * IIR_FCR = BAR0_addr + 0x8;
   IIR_FCR[0] = 0x7;
   IER_DLH[0] = IER_DLH[0] & ~0x8F;   
   LSR = BAR0_addr + 0x14;

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Configuration UART on Intel Galileo

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