Simple read/write API for the W25X40BV SPI Flash IC wiki: http://mbed.org/cookbook/W25X40BV
W25X40BV.h@0:9de212faf980, 2012-03-19 (annotated)
- Committer:
- jyam
- Date:
- Mon Mar 19 10:20:37 2012 +0000
- Revision:
- 0:9de212faf980
- Child:
- 1:cd41b8e3fdad
initial publish
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
jyam | 0:9de212faf980 | 1 | // W25X40BV.h |
jyam | 0:9de212faf980 | 2 | |
jyam | 0:9de212faf980 | 3 | #ifndef W25X40BV_H |
jyam | 0:9de212faf980 | 4 | #define W25X40BV_H |
jyam | 0:9de212faf980 | 5 | |
jyam | 0:9de212faf980 | 6 | #include "mbed.h" |
jyam | 0:9de212faf980 | 7 | |
jyam | 0:9de212faf980 | 8 | #define SPI_FREQ 1000000 |
jyam | 0:9de212faf980 | 9 | #define SPI_MODE 0 |
jyam | 0:9de212faf980 | 10 | #define SPI_NBIT 8 |
jyam | 0:9de212faf980 | 11 | |
jyam | 0:9de212faf980 | 12 | #define WE_INST 0x06 |
jyam | 0:9de212faf980 | 13 | #define WD_INST 0x04 |
jyam | 0:9de212faf980 | 14 | #define R_INST 0x03 |
jyam | 0:9de212faf980 | 15 | #define W_INST 0x02 |
jyam | 0:9de212faf980 | 16 | #define C_ERASE_INST 0x60 |
jyam | 0:9de212faf980 | 17 | |
jyam | 0:9de212faf980 | 18 | #define DUMMY_ADDR 0x00 |
jyam | 0:9de212faf980 | 19 | #define WAIT_TIME 1 |
jyam | 0:9de212faf980 | 20 | |
jyam | 0:9de212faf980 | 21 | #define ADDR_BMASK2 0x00ff0000 |
jyam | 0:9de212faf980 | 22 | #define ADDR_BMASK1 0x0000ff00 |
jyam | 0:9de212faf980 | 23 | #define ADDR_BMASK0 0x000000ff |
jyam | 0:9de212faf980 | 24 | |
jyam | 0:9de212faf980 | 25 | #define ADDR_BSHIFT2 16 |
jyam | 0:9de212faf980 | 26 | #define ADDR_BSHIFT1 8 |
jyam | 0:9de212faf980 | 27 | #define ADDR_BSHIFT0 0 |
jyam | 0:9de212faf980 | 28 | |
jyam | 0:9de212faf980 | 29 | class W25X40BV { |
jyam | 0:9de212faf980 | 30 | public: |
jyam | 0:9de212faf980 | 31 | W25X40BV(PinName mosi, PinName miso, PinName sclk, PinName cs); |
jyam | 0:9de212faf980 | 32 | |
jyam | 0:9de212faf980 | 33 | int read(int addr); // takes a 24-bit (3 bytes) address and returns the data (1 byte) at that location |
jyam | 0:9de212faf980 | 34 | int read(int a2, int a1, int a0); // takes the address in 3 separate bytes A[23,16], A[15,8], A[7,0] |
jyam | 0:9de212faf980 | 35 | |
jyam | 0:9de212faf980 | 36 | void write(int addr, int data); // takes a 24-bit (3 bytes) address and a byte of data to write at that location |
jyam | 0:9de212faf980 | 37 | void write(int a2, int a1, int a0, int data); // takes the address in 3 separate bytes A[23,16], A[15,8], A[7,0] |
jyam | 0:9de212faf980 | 38 | |
jyam | 0:9de212faf980 | 39 | void chipErase(); // erase all data on chip |
jyam | 0:9de212faf980 | 40 | |
jyam | 0:9de212faf980 | 41 | private: |
jyam | 0:9de212faf980 | 42 | void writeEnable(); // write enable |
jyam | 0:9de212faf980 | 43 | void writeDisable(); // write disable |
jyam | 0:9de212faf980 | 44 | void chipEnable(); // chip enable |
jyam | 0:9de212faf980 | 45 | void chipDisable(); // chip disable |
jyam | 0:9de212faf980 | 46 | |
jyam | 0:9de212faf980 | 47 | SPI _spi; |
jyam | 0:9de212faf980 | 48 | DigitalOut _cs; |
jyam | 0:9de212faf980 | 49 | }; |
jyam | 0:9de212faf980 | 50 | |
jyam | 0:9de212faf980 | 51 | #endif |