Cypress Semiconductor CY8C21534 Spezifikationen PDF herunterladen (Seite 59)

Appendix 2

9(15)

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)){};

Rdata = SPIM_bReadRxData();

CS_toggle();

}

CS_toggle();

}

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

// Toggles the chip select of the SD card while writing commands.

void CS_toggle(void)

{

SD_SS_Switch(1); // SS port HIGH, SS off

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

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

SD_SS_Switch(0); // SS port LOW, SS on

}

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

// Write command structure. High byte + 6 byte command + 2 high bytes.

void write_data_init(BYTE loc1, BYTE loc2, BYTE loc3, BYTE loc4)

{

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

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

SPIM_SendTxData(0x59); // set message to transmit // CMD 25(59) Continuous write

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

SPIM_SendTxData(loc1); // set message to transmit

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

SPIM_SendTxData(loc2); // set message to transmit

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

SPIM_SendTxData(loc3); // set message to transmit

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

SPIM_SendTxData(loc4); // 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)){};

}

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