ARMmbed
/
mbed-os
mirror of https://github.com/ARMmbed/mbed-os.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Fixed SD card intialization failure 

Few SD cards were failing for CMD41 as device was not ready after CMD55.
Added busy delay loop to make sure device is ready and than proceed.
pull/7774/head
deepikabhavnani 2017-08-12 00:11:31 -05:00
parent 2d247581c6
commit 1a02b0528c
1 changed files with 11 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
SDBlockDevice.cpp
View File

@ -690,7 +690,12 @@ int SDBlockDevice::_cmd(SDBlockDevice::cmdSupported cmd, uint32_t arg, bool isAc
for(int i = 0; i < 3; i++) {
// Send CMD55 for APP command first
if (isAcmd) {
_cmd_spi(CMD55_APP_CMD, 0x0);
response = _cmd_spi(CMD55_APP_CMD, 0x0);
}
// Wait for card to be ready after CMD55
if (false == _wait_ready(SD_COMMAND_TIMEOUT)) {
debug_if(SD_DBG, "Card not ready yet \n");
}
// Send command over SPI interface
@ -710,20 +715,20 @@ int SDBlockDevice::_cmd(SDBlockDevice::cmdSupported cmd, uint32_t arg, bool isAc
// Process the response R1 : Exit on CRC/Illegal command error/No response
if (R1_NO_RESPONSE == response) {
_deselect();
debug_if(SD_DBG, "No response CMD:%d \n", cmd);
debug_if(SD_DBG, "No response CMD:%d response: 0x%x\n",cmd, response);
return SD_BLOCK_DEVICE_ERROR_NO_DEVICE; // No device
}
if (response & R1_COM_CRC_ERROR) {
_deselect();
debug_if(SD_DBG, "CRC error CMD:%d \n", cmd);
debug_if(SD_DBG, "CRC error CMD:%d response 0x%x \n",cmd, response);
return SD_BLOCK_DEVICE_ERROR_CRC; // CRC error
}
if (response & R1_ILLEGAL_COMMAND) {
debug_if(SD_DBG, "Illegal command CMD:%d\n", cmd);
_deselect();
debug_if(SD_DBG, "Illegal command CMD:%d response 0x%x\n",cmd, response);
if (CMD8_SEND_IF_COND == cmd) { // Illegal command is for Ver1 or not SD Card
_card_type = CARD_UNKNOWN;
}
_deselect();
return SD_BLOCK_DEVICE_ERROR_UNSUPPORTED; // Command not supported
}
@ -1024,4 +1029,5 @@ void SDBlockDevice::_deselect() {
_cs = 1;
_spi.unlock();
}
#endif /* DEVICE_SPI */