Cypress Semiconductor CY8C21534 Especificaciones descargar pdf (Pagina 32)

WiFly and buffered as it is sent out of the UART connection. The MCU is

programmed to enter this raw data directly to the SD card in 512 byte chunks

using a FOR loop. The sector count that was received from the server program

dictates the length of this loop for proper writing function. After all of the data is

received from the UART connection the WiFly unit is no longer needed, and it is

powered off by the Communications MCU.

5.4 Integration of SD Card

For the connection to the SD card the Communications MCU was used. The pins of the

SD card can be connected to the pins of the MCU and used in SPI mode. Figure 18

shows the correct connection of the SD card to the PSoC microcontroller.

33 .V

1k 1k 1k 000

S C rdS cke

Da ot

S_ E2 DR S 9

S_S DC 1 S_S DC

S _ OI DM S 2 S _ OI DM

VS S 3

S C rd Da VC C 4

33 .V

S _ CK DS L 5 S _ CK DS

VS S 6

S _ IS DM O 7 S _ IS DM

S_ E1 DR S 8

S_D DC

CM O S_ P DW S_D DC

S_ P DW

Figure 18: SD Card Interface to PSoC Microcontroller. Taken from PSoC SD Card

Module Solution PPT [18, 14].

The SD card socket shown in figure 18 can be a purchased prefabricated SD card

breakout board, or as in this project it can be a custom breakout board made from a

Micro SD to SD card size adaptor with pin connectors soldered to the contacts. The

SD_CD and SD_WP pins were not utilized in this project as they are for functions that

were not needed for the operation of the electronic class schedule. The four data lines

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 68 69

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