Sundance SMT335E - Manual (Page 33)

Version 1.5 Page 33 of 53 SMT335E SMT375E User Manual
Example of reading a number (
size
) frames, each of 1024 bytes
int *ptr_gbctrl =(int*) 0x03800000;
int *ptr_gbstart_addr =(int*) 0x03880000;
int *ptr_gblenth =(int*) 0x03900000; // Bit 9 sets read or write
int *ptr_gbdpram =(int*) 0x03A00000;
int *interrupt_reg =(int *) SMT335EINTCTRL4; // use ext_int4
*interrupt_reg = 0x00008000; // Map GB signal to INT4
// Set SMT320 Burst mode ON
*ptr_gbstart_addr = 0xC0800000;
*ptr_gblenth = 0+0x100; // Write command of 1 word
*ptr_gbdpram = 0x00000001;
while(((*ptr_gbctrl)&0x1)==0) {}
// Set the SMT320 PCI address destination
*ptr_gbstart_addr = 0xC0400000;
*ptr_gblenth = 0+0x100; // Write command
*ptr_gbdpram = addr; // PCI destination address=addr
// Send the data over the PCI
*ptr_gbstart_addr = 0xC0000000;
*DMA_PRI_CRTL0 = 0x070100F0; // Set interrupt sources INT4
*DMA_SEC_CRTL0 = 0x0000A000; // Clear the interrupt
*ptr_gbctrl = 2; // auto-reload no address inc
*ptr_gblenth = 256-1+0x100; // multiple of 16 in burst mode
*DMA_SRC_ADDR0 = (int)ptr_gbdpram; // Set the source address
*DMA_DST_ADDR0 = (int)ptr_buffer; // Set the destination address
*DMA_XFR_CNTR0 = (size<<16)+0x100; // Set the transfer sizes
// FRAME_CNT = size, E_CNT=0x0100
*DMA_GL_CNT_RLD = 0x0100; // Set the count reload
*DMA_GL_INDEX = ((-255*4)<<16)+4; // index: Frame = –255*4 bytes
// index: Element = 4 bytes
*DMA_PRI_CRTL0 = 0x07010071; // Start DMA0 using INT4
// Use index only for source
while((*DMA_PRI_CRTL0&0xc)!=0) {} // Wait for DMA1 to finish
*interrupt_reg = 0; // Clear INTCTRL4