Simple read/write API for the W25X40BV SPI Flash IC wiki: http://mbed.org/cookbook/W25X40BV
Diff: W25X40BV.cpp
- Revision:
- 0:9de212faf980
- Child:
- 1:cd41b8e3fdad
diff -r 000000000000 -r 9de212faf980 W25X40BV.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/W25X40BV.cpp Mon Mar 19 10:20:37 2012 +0000 @@ -0,0 +1,90 @@ +// W25X40BV.cpp + +#include"W25X40BV.h" + +// CONSTRUCTOR +W25X40BV::W25X40BV(PinName mosi, PinName miso, PinName sclk, PinName cs) : _spi(mosi, miso, sclk), _cs(cs) { + _spi.format(SPI_NBIT, SPI_MODE); + _spi.frequency(SPI_FREQ); + chipDisable(); +} + + +// READING +int W25X40BV::read(int addr) { + chipEnable(); + _spi.write(R_INST); + _spi.write((addr & ADDR_BMASK2) >> ADDR_BSHIFT2); + _spi.write((addr & ADDR_BMASK1) >> ADDR_BSHIFT1); + _spi.write((addr & ADDR_BMASK0) >> ADDR_BSHIFT0); + int response = _spi.write(DUMMY_ADDR); + chipDisable(); + return response; +} +int W25X40BV::read(int a2, int a1, int a0) { + chipEnable(); + _spi.write(R_INST); + _spi.write(a2); + _spi.write(a1); + _spi.write(a0); + int response = _spi.write(DUMMY_ADDR); + chipDisable(); + return response; +} + + +// WRITING +void W25X40BV::write(int addr, int data) { + writeEnable(); + chipEnable(); + _spi.write(W_INST); + _spi.write((addr & ADDR_BMASK2) >> ADDR_BSHIFT2); + _spi.write((addr & ADDR_BMASK1) >> ADDR_BSHIFT1); + _spi.write((addr & ADDR_BMASK0) >> ADDR_BSHIFT0); + _spi.write(data); + chipDisable(); + writeDisable(); + wait(WAIT_TIME); +} +void W25X40BV::write(int a2, int a1, int a0, int data) { + writeEnable(); + chipEnable(); + _spi.write(W_INST); + _spi.write(a2); + _spi.write(a1); + _spi.write(a0); + _spi.write(data); + chipDisable(); + writeDisable(); + wait(WAIT_TIME); +} + + +//ERASING +void W25X40BV::chipErase() { + writeEnable(); + chipEnable(); + _spi.write(C_ERASE_INST); + chipDisable(); + writeDisable(); + wait(WAIT_TIME); +} + + +//ENABLE/DISABLE (private functions) +void W25X40BV::writeEnable() { + chipEnable(); + _spi.write(WE_INST); + chipDisable(); +} +void W25X40BV::writeDisable() { + chipEnable(); + _spi.write(WD_INST); + chipDisable(); +} +void W25X40BV::chipEnable() { + _cs = 0; +} +void W25X40BV::chipDisable() { + _cs = 1; +} \ No newline at end of file