Cypress Semiconductor CY8C21534 Especificações descarregar pdf (Página 58)

Appendix 2

8(15)

// Function description----------------------------------------

// Initializes SD card for SPI communications

void card_initialize(void)

{

for(i=0; i < 2400; i++);

for(i=0; i < 100; i++)

{

SPIM_SendTxData(0xFF); // set message to transmit

// Delay

// Clock train for SPI mode

while(!(SPIM_bReadStatus() & SPIM_SPIM_SPI_COMPLETE)){};

}

SD_SS_Switch(0);

SPIM_SendTxData(0xFF); // set message to transmit

while(!(SPIM_bReadStatus() & SPIM_SPIM_SPI_COMPLETE)){};

SPIM_SendTxData(0x40); // set message to transmit

while(!(SPIM_bReadStatus() & SPIM_SPIM_SPI_COMPLETE)){};

SPIM_SendTxData(0x00); // set message to transmit

while(!(SPIM_bReadStatus() & SPIM_SPIM_SPI_COMPLETE)){};

SPIM_SendTxData(0x00); // set message to transmit

while(!(SPIM_bReadStatus() & SPIM_SPIM_SPI_COMPLETE)){};

SPIM_SendTxData(0x00); // set message to transmit

while(!(SPIM_bReadStatus() & SPIM_SPIM_SPI_COMPLETE)){};

SPIM_SendTxData(0x00); // set message to transmit

while(!(SPIM_bReadStatus() & SPIM_SPIM_SPI_COMPLETE)){};

SPIM_SendTxData(0x95); // set message to transmit

while(!(SPIM_bReadStatus() & SPIM_SPIM_SPI_COMPLETE)){};

SPIM_SendTxData(0xFF); // set message to transmit

while(!(SPIM_bReadStatus() & SPIM_SPIM_SPI_COMPLETE)){};

while(Rdata != 0x01)

{

SPIM_SendTxData(0xFF); // set message to transmit

// SD port low, SS on

// CMD 0, set SPI mode

// Waits until ready

while(!(SPIM_bReadStatus() & SPIM_SPIM_SPI_COMPLETE)){};

Rdata = SPIM_bReadRxData();

}

CS_toggle();

while(Rdata != 0x00)

{

SPIM_SendTxData(0x77); // set message to transmit // CMD 55 (ACMD41)

while(!(SPIM_bReadStatus() & SPIM_SPIM_SPI_COMPLETE)){};

SPIM_SendTxData(0x00); // set message to transmit

while(!(SPIM_bReadStatus() & SPIM_SPIM_SPI_COMPLETE)){};

SPIM_SendTxData(0x00); // set message to transmit

while(!(SPIM_bReadStatus() & SPIM_SPIM_SPI_COMPLETE)){};

SPIM_SendTxData(0x00); // set message to transmit

while(!(SPIM_bReadStatus() & SPIM_SPIM_SPI_COMPLETE)){};

SPIM_SendTxData(0x00); // set message to transmit

while(!(SPIM_bReadStatus() & SPIM_SPIM_SPI_COMPLETE)){};

SPIM_SendTxData(0x95); // set message to transmit

while(!(SPIM_bReadStatus() & SPIM_SPIM_SPI_COMPLETE)){};

SPIM_SendTxData(0xFF); // set message to transmit

while(!(SPIM_bReadStatus() & SPIM_SPIM_SPI_COMPLETE)){};

SPIM_SendTxData(0xFF); // set message to transmit

while(!(SPIM_bReadStatus() & SPIM_SPIM_SPI_COMPLETE)){};

CS_toggle();

SPIM_SendTxData(0x69); // set message to transmit // CMD 41 (ACMD41)

while(!(SPIM_bReadStatus() & SPIM_SPIM_SPI_COMPLETE)){};

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