hi, all
now , I want to use the SPI to tranfer a file to a FPGA. the file is
saved in nor flash (0x2200000).
The transmition by CPU is ok , then I want to use the EDMA .
the DMA transfer finished after transfer only 1 byte,then enter the DMA
callback function.
waht worse is that this one byte is 0x00, not the data in flash
0x2200000.
I set the dma parameters like this: coulde anybody tell me why?
static void spi_davinci_tx_dma_cb( void )
{
DBGENTER;
davinci_stop_dma(spi_dma_config.dma_tx_lch );
davinci_free_dma(spi_dma_config.dma_tx_lch );
spi_dma_config.dma_tx_lch = -1;
complete(&(spi_dma_config.tx_dma_completion));
}
int spi_davinci_tx_dma( dma_addr_t buffer, unsigned int len /*bytes*/)
{
spi_dma_config.dma_tx_sync = DAVINCI_DMA_SPI_SPIX ;
if ((r = davinci_request_dma(spi_dma_config.dma_tx_sync ,
"SPI_TX",
spi_davinci_tx_dma_cb,
spi_davinci_saved_oadap,
&edma_chan_num, &tcc, queue_no)) !=
0)
{
DBG("davinci_request_dma() failed with %d\n", r);
return r;
}
spi_dma_config.dma_tx_lch =edma_chan_num;
DBG("TX DMA on channel %d\n", edma_chan_num);
// init dma tx completion.
init_completion(&(spi_dma_config.tx_dma_completion));
DBG("buffer addr(0x%x),len(%d)\n", buffer,len);
davinci_set_dma_src_params(spi_dma_config.dma_tx_lch, buffer,
0,0);
davinci_set_dma_dest_params(spi_dma_config.dma_tx_lch, (unsigned
long)0x01c6683c, 1, 0); // 0x01c6683c is SPIDAT1 register address.
davinci_set_dma_src_index(spi_dma_config.dma_tx_lch,len,0);
davinci_set_dma_dest_index(spi_dma_config.dma_tx_lch, 0 ,0);
davinci_set_dma_transfer_params(spi_dma_config.dma_tx_lch, len,
1, 1, 0,ASYNC);
#endif
// start system DMA
//davinci_start_dma(spi_dma_config.dma_tx_lch);
spi_davinci_saved_oadap->regs->SPIINT0 |=(1<<16); //enable SPI
DAM function
ret = davinci_start_dma(spi_dma_config.dma_tx_lch);
// wait DMA xfer over.
wait_for_completion(&(spi_dma_config.tx_dma_completion));
return ret;
}
static void fpga_test (void)
{
#define LEN (100)
int ret ;
unsigned int flash_addr ;
flash_addr = 0x2200000;
ret = spi_davinci_tx_dma(flash_addr, LEN );
DBG("ret(%d)\n",ret);
}
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