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Code Issues Releases Activity

Fix SPI transaction mismatch errors

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This commit is contained in:
PaulStoffregen 2014-11-20 18:54:04 -08:00 committed by Cristian Maglie
parent 37115d03ef
commit 20ca43646a
1 changed files with 10 additions and 2 deletions
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12
libraries/SD/utility/Sd2Card.cpp
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@ -157,16 +157,24 @@ uint32_t Sd2Card::cardSize(void) {
} }
} }
//------------------------------------------------------------------------------ //------------------------------------------------------------------------------
static uint8_t chip_select_asserted = 0;
void Sd2Card::chipSelectHigh(void) { void Sd2Card::chipSelectHigh(void) {
digitalWrite(chipSelectPin_, HIGH); digitalWrite(chipSelectPin_, HIGH);
#ifdef USE_SPI_LIB #ifdef USE_SPI_LIB
SPI.endTransaction(); if (chip_select_asserted) {
chip_select_asserted = 0;
SPI.endTransaction();
}
#endif #endif
} }
//------------------------------------------------------------------------------ //------------------------------------------------------------------------------
void Sd2Card::chipSelectLow(void) { void Sd2Card::chipSelectLow(void) {
#ifdef USE_SPI_LIB #ifdef USE_SPI_LIB
SPI.beginTransaction(settings); if (!chip_select_asserted) {
chip_select_asserted = 1;
SPI.beginTransaction(settings);
}
#endif #endif
digitalWrite(chipSelectPin_, LOW); digitalWrite(chipSelectPin_, LOW);
} }