void FatFS_class::begin(SPIClass &spi, int csline)
{
s_spi=&spi;
s_csline=csline;
digitalWrite(csline,HIGH);
pinMode(csline,OUTPUT);
spi.setDataMode(SPI_MODE3);
spi.setClockDivider(SPI_CLOCK_DIV4);
register_sd();
}
/**
Set the SPI clock rate.
\param[in] sckRateID A value in the range [0, 6].
The SPI clock will be set to F_CPU/pow(2, 1 + sckRateID). The maximum
SPI rate is F_CPU/2 for \a sckRateID = 0 and the minimum rate is F_CPU/128
for \a scsRateID = 6.
\return The value one, true, is returned for success and the value zero,
false, is returned for an invalid value of \a sckRateID.
*/
uint8_t Sd2Card::setSckRate(uint8_t sckRateID)
{
if (sckRateID > 6)
{
error(SD_CARD_ERROR_SCK_RATE);
return false;
}
#ifndef USE_SPI_LIB
// see avr processor datasheet for SPI register bit definitions
if ((sckRateID & 1) || sckRateID == 6)
{
SPSR &= ~(1 << SPI2X);
}
else
{
SPSR |= (1 << SPI2X);
}
SPCR &= ~((1 << SPR1) | (1 << SPR0));
SPCR |= (sckRateID & 4 ? (1 << SPR1) : 0)
| (sckRateID & 2 ? (1 << SPR0) : 0);
#else // USE_SPI_LIB
int v;
#ifdef SPI_CLOCK_DIV128
switch (sckRateID)
{
case 0: v = SPI_CLOCK_DIV2; break;
case 1: v = SPI_CLOCK_DIV4; break;
case 2: v = SPI_CLOCK_DIV8; break;
case 3: v = SPI_CLOCK_DIV16; break;
case 4: v = SPI_CLOCK_DIV32; break;
case 5: v = SPI_CLOCK_DIV64; break;
case 6: v = SPI_CLOCK_DIV128; break;
}
#else // SPI_CLOCK_DIV128
v = 2 << sckRateID;
#endif // SPI_CLOCK_DIV128
SPI_for_SD.setClockDivider(v);
#endif // USE_SPI_LIB
return true;
}
/**
Initialize an SD flash memory card.
\param[in] sckRateID SPI clock rate selector. See setSckRate().
\param[in] chipSelectPin SD chip select pin number.
\return The value one, true, is returned for success and
the value zero, false, is returned for failure. The reason for failure
can be determined by calling errorCode() and errorData().
*/
uint8_t Sd2Card::init(uint8_t chipSelectPin, uint8_t sckRateID, int8_t SPI_Port, int8_t cardDetectionPin, int8_t level)
{
// Serial.println("> Sd2Card::init");
errorCode_ = inBlock_ = partialBlockRead_ = type_ = 0;
chipSelectPin_ = chipSelectPin;
SPI_Port_ = SPI_Port;
cardDetectionPin_ = cardDetectionPin;
level_ = level;
// 16-bit init start time allows over a minute
uint16_t t0 = (uint16_t)millis();
uint32_t arg;
// set pin modes
pinMode(chipSelectPin_, OUTPUT);
chipSelectHigh();
if (cardDetectionPin_ >= 0)
{
pinMode(cardDetectionPin_, INPUT_PULLUP);
}
//#ifndef USE_SPI_LIB
// pinMode(SPI_MISO_PIN, INPUT);
// pinMode(SPI_MOSI_PIN, OUTPUT);
// pinMode(SPI_SCK_PIN, OUTPUT);
//#endif
//#ifndef SOFTWARE_SPI
//#ifndef USE_SPI_LIB
// // SS must be in output mode even it is not chip select
// pinMode(SS_PIN, OUTPUT);
// digitalWrite(SS_PIN, HIGH); // disable any SPI device using hardware SS pin
// // Enable SPI, Master, clock rate f_osc/128
// SPCR = (1 << SPE) | (1 << MSTR) | (1 << SPR1) | (1 << SPR0);
// // clear double speed
// SPSR &= ~(1 << SPI2X);
//#else // USE_SPI_LIB
/// @todo Add SPI port selection for LM4F and TM4C
SPI_for_SD.begin();
#if defined(__LM4F120H5QR__) || defined(__TM4C1230C3PM__) || defined(__TM4C123GH6PM__) || defined(__TM4C129XNCZAD__) || defined(__TM4C1294NCPDT__)
// LM4F and TM4C specific
if (SPI_Port >= 0)
{
SPI_for_SD.setModule(SPI_Port);
}
#endif
#ifdef SPI_CLOCK_DIV128
// Serial.println("> SPI_Port 128");
SPI_for_SD.setClockDivider(SPI_CLOCK_DIV128);
#else
// Serial.println("> SPI_Port 255");
SPI_for_SD.setClockDivider(255);
#endif
//#endif // USE_SPI_LIB
//#endif // SOFTWARE_SPI
// Hardware card detection
if (cardDetectionPin_ >= 0)
{
// debugln("hardware card detection %i should be %i", digitalRead(cardDetectionPin_), level);
if (digitalRead(cardDetectionPin_) != level_)
{
// Serial.println("*** hardware failure");
error(SD_CARD_ERROR_CMD0);
// I don't like goto but this is how it is implemented
goto fail;
}
}
// Software card detection
// must supply min of 74 clock cycles with CS high.
for (uint8_t i = 0; i < 10; i++)
{
spiSend(0xff);
}
chipSelectLow();
// Serial.print("software card detection ");
// command to go idle in SPI mode
while ((status_ = cardCommand(CMD0, 0)) != R1_IDLE_STATE)
{
if (((uint16_t)millis() - t0) > SD_INIT_TIMEOUT)
{
error(SD_CARD_ERROR_CMD0);
// Serial.println("*** software failure");
goto fail;
}
}
// check SD version
if ((cardCommand(CMD8, 0x1AA) & R1_ILLEGAL_COMMAND))
{
type(SD_CARD_TYPE_SD1);
}
else
{
// only need last byte of r7 response
for (uint8_t i = 0; i < 4; i++)
{
status_ = spiRec();
}
if (status_ != 0xaa)
{
error(SD_CARD_ERROR_CMD8);
goto fail;
}
type(SD_CARD_TYPE_SD2);
}
// initialize card and send host supports SDHC if SD2
arg = type() == SD_CARD_TYPE_SD2 ? 0x40000000 : 0;
while ((status_ = cardAcmd(ACMD41, arg)) != R1_READY_STATE)
{
// check for timeout
if (((uint16_t)millis() - t0) > SD_INIT_TIMEOUT)
{
error(SD_CARD_ERROR_ACMD41);
goto fail;
}
}
// if SD2 read OCR register to check for SDHC card
if (type() == SD_CARD_TYPE_SD2)
{
if (cardCommand(CMD58, 0))
{
error(SD_CARD_ERROR_CMD58);
goto fail;
}
if ((spiRec() & 0xc0) == 0xc0)
{
type(SD_CARD_TYPE_SDHC);
}
// discard rest of ocr - contains allowed voltage range
for (uint8_t i = 0; i < 3; i++)
{
spiRec();
}
}
chipSelectHigh();
#ifndef SOFTWARE_SPI
return setSckRate(sckRateID);
#else // SOFTWARE_SPI
return true;
#endif // SOFTWARE_SPI
fail:
chipSelectHigh();
return false;
}
