hal_dma.h File Reference

DMA configuration. More...

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Functions
void	HAL_DMA_Init (void)
	Initializing DMA.

Detailed Description

DMA configuration.

Definition in file hal_dma.h.

Function Documentation

void HAL_DMA_Init

(

void

)

Initializing DMA.

Returns

void

Parameters

void

Definition at line 29 of file hal_dma.c.

{ 
    // External DMA trigger is mapped to P2.1
    MAX2769_EXT_DMA_TRIG_PORT(SEL) |=  BV(MAX2769_EXT_DMA_TRIG_PIN);
    MAX2769_EXT_DMA_TRIG_PORT(DIR) &= ~BV(MAX2769_EXT_DMA_TRIG_PIN);
  
    // Port mapping for P2.1
    PMAPKEYID = PMAPKEY;
    // P2.1 is mapped to external DMA trigger
    P2MAP1    = 0x02;
    
    // Set external input as DMA trigger
    DMACTL0   = DMA0TSEL_31;
    
    // Read-modify-write disable
    DMACTL4   =  DMARMWDIS;
    DMA0CTL  &= ~DMAIFG;
    
    // DMA destination address will be incremental while DMA source address won't be changed
    DMA0CTL = DMADSTINCR_3;
    
    // Enabling DMA transfer till the size of 'SIZE_OF_GPS_DATA_CHUNK_IN_WORDS' reached
    DMA0SZ = SIZE_OF_GPS_DATA_CHUNK_IN_BYTE / 2;
    
    // Set DMA source address to base address of P5IN (0x0240)
    // Because P5IN and P6IN are adjuscent registers with 1 byte offset, 
    // P5IN and P6IN will be transferred at a time if accessed with length of word (16 bit)
    __data16_write_addr((unsigned short) &DMA0SA,(unsigned long) 0x0240);
    
    // DMA destination address setting : address of 'GPSData' structure
    __data16_write_addr((unsigned short) &DMA0DA,(unsigned long) &uniCLEONGPSData);
    
    // Enabling DMA interrupt 
    DMA0CTL |= DMAIE;    
}

Here is the caller graph for this function: