Hello,
I try to use the SD card of the Zedboard via the SDIO port. I use chans FatFs. First I implemented the diskio.c by my own, but then debugging it I found that there is an implementation in an example project, so now I use that one.
It can be found here:
XilinxSDK2014.2dataembeddedswlibsw_servicesxilffs_v2_1
Initialization works partly, but not fully:
.
XSdPs_SdCardInitialize
XSdPs_Change_ClkFreq(&SdInstance, SD_CLK_25_MHZ);
and XSdPs_Select_Card
.
work propperly, but XSdPs_Get_BusWidth does not anymore.
It seems like commands are accepted, but DMA transfers are not:
.
/*
* Send block write command
*/
Status = XSdPs_CmdTransfer(InstancePtr, CMD55,
tttInstancePtr->RelCardAddr, 0);
tif (Status != XST_SUCCESS) {
t....Status = XST_FAILURE;
t....goto RETURN_PATH;
t}
tBlkCnt = XSDPS_SCR_BLKCNT;
tBlkSize = XSDPS_SCR_BLKSIZE;
t/*
t * Set block size to the value passed
t */
tBlkSize &= XSDPS_BLK_SIZE_MASK;
tXSdPs_WriteReg16(InstancePtr->Config.BaseAddress,
tttXSDPS_BLK_SIZE_OFFSET, BlkSize);
tXSdPs_SetupADMA2DescTbl(InstancePtr, BlkCnt, SCR);
tXSdPs_WriteReg16(InstancePtr->Config.BaseAddress,
tttXSDPS_XFER_MODE_OFFSET,
tttXSDPS_TM_DAT_DIR_SEL_MASK | XSDPS_TM_DMA_EN_MASK);
tStatus = XSdPs_CmdTransfer(InstancePtr, ACMD51, 0, BlkCnt);
tif (Status != XST_SUCCESS) {
t....Status = XST_FAILURE;
t....goto RETURN_PATH;
t}
.
SdPs_CmdTransfer(InstancePtr, ACMD51, 0, BlkCnt) returns with 1.
.
Maybe I did something wrong in the hardware design. I added the SD 0 Peripheral and assigned CD to MIO 47, WP to MIO46.
Do I have to activate the DMA somehow?
.
There is one funny fact: when I let the example program run, a file is generated on the SD, but it cannot be neither read nor written by the zynq.
.
Best regards,
Yaro
