sd card i/o hang - beaglebone, starterware, ccs

Hi,

Referance implementation for the same use case is present in Beaglebone Demo example.

Please refer the same it might help you.

Reagrds,

Ramesh D

I think the big difference I see between "demo" and my application is that httpd reads in memory data for the files in demo.

In my application httpd is reading data from the fat/fs-sd/card directly when a page is requested -- that is when the hang occurs.

If fact if I force my application to read in memory data for the file requested, then it works ok as well.

I suspect that it is a problem between the httpd support and the fat/fs-sd/card support;

interrupt priorities, masking....

Companion call stack:

ws-sensors [Code Composer Studio - Device Debugging] 
 Texas Instruments XDS100v2 USB Emulator_0/M3_wakeupSS_0 (Disconnected : Unknown) 
 Texas Instruments XDS100v2 USB Emulator_0/CortxA8 (Suspended) 
  HSMMCSDCmdStatusGet(struct _mmcsdCtrlInfo *)() at hs_mmcsd_rw.c:157 0x80091FB4  
  HSMMCSDCmdSend(struct _mmcsdCtrlInfo *, struct _mmcsdCmd *)() at hs_mmcsdlib.c:211 0x80096368  
  MMCSDCmdSend(struct _mmcsdCtrlInfo *, struct _mmcsdCmd *)() at mmcsd_proto.c:80 0x800905E0  
  MMCSDReadCmdSend(struct _mmcsdCtrlInfo *, void *, unsigned int, unsigned int)() at mmcsd_proto.c:702 0x80091230  
  disk_read(unsigned char, unsigned char *, unsigned int, unsigned char)() at fat_mmcsd.c:137 0x80097950  
  move_window(struct _FATFS *, unsigned int)() at ff.c:87 0x800898A0  
  trace_path(struct _DIR *, unsigned char *, unsigned char *, unsigned char * *)() at ff.c:513 0x8008A718  
  f_open(struct _FIL *, unsigned char *, unsigned char)() at ff.c:823 0x8008B19C  
  fs_open_custom(struct fs_file *, unsigned char *)() at fs_custom.c:161 0x800944E0  
  fs_open(unsigned char *)() at fs.c:116 0x8008E664  
  http_find_file(struct http_state *, unsigned char *, int)() at httpd_io.c:1,794 0x8008F264  
  http_parse_request(struct pbuf * *, struct http_state *, struct tcp_pcb *)() at httpd_io.c:1,676 0x8008F044  
  http_recv(void *, struct tcp_pcb *, struct pbuf *, char)() at httpd_io.c:2,017 0x8008F5B4  
  tcp_input(struct pbuf *, struct netif *)() at tcp_in.c:362 0x80080330  
  ip_input(struct pbuf *, struct netif *)() at ip.c:506 0x80086050  
  ethernet_input(struct pbuf *, struct netif *)() at etharp.c:1,284 0x80087A38  
  cpswif_rx_inthandler(unsigned int, struct netif *)() at cpswif.c:1,121 0x80088D18  
  lwIPRxIntHandler(unsigned int)() at lwiplib.c:320 0x8008963C  
  CPSWCore0RxIsr() at enet.c:231 0x8009727C  
  0x80098BD0  (no symbols are defined for 0x80098BD0) 
 Texas Instruments XDS100v2 USB Emulator_0/PRU_0 (Disconnected : Unknown) 
 Texas Instruments XDS100v2 USB Emulator_0/PRU_1 (Disconnected : Unknown)