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Code Issues Releases Activity

sd card: fix SD R1 detection

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SD R1 response format is defined as any byte with the MSb
cleared.  The code was testing for any byte that was not 0xFF
which can lead to misinterpreting a byte as the response.

git-svn-id: svn://svn.openpilot.org/OpenPilot/trunk@998 ebee16cc-31ac-478f-84a7-5cbb03baadba
This commit is contained in:
stac 2010-07-04 02:20:57 +00:00 committed by stac
parent 5c230e734d
commit 1169514bf9
1 changed files with 1 additions and 1 deletions
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2
flight/PiOS/Common/pios_sdcard.c
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@ -365,7 +365,7 @@ int32_t PIOS_SDCARD_SendSDCCmd(uint8_t cmd, uint32_t addr, uint8_t crc)
} else {
/* Wait for standard R1 response */
for(i = 0; i < 8; ++i) {
if((ret = PIOS_SPI_TransferByte(PIOS_SDCARD_SPI, 0xff)) != 0xff ) {
if(!((ret = PIOS_SPI_TransferByte(PIOS_SDCARD_SPI, 0xff)) & 0x80) ) {
break;
}
}