Simple test program for the W25X40BV API. The library files can be found in the next column or [[http://mbed.org/users/jyam/libraries/W25X40BV/m73pwt|here]].
Revision 0:0da0b91683f8, committed 2012-03-19
- Comitter:
- jyam
- Date:
- Mon Mar 19 09:55:28 2012 +0000
- Child:
- 1:78c4315e6114
- Commit message:
- initial publish
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/W25X40BV.cpp Mon Mar 19 09:55:28 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
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/W25X40BV.h Mon Mar 19 09:55:28 2012 +0000 @@ -0,0 +1,51 @@ +// W25X40BV.h + +#ifndef W25X40BV_H +#define W25X40BV_H + +#include "mbed.h" + +#define SPI_FREQ 1000000 +#define SPI_MODE 0 +#define SPI_NBIT 8 + +#define WE_INST 0x06 +#define WD_INST 0x04 +#define R_INST 0x03 +#define W_INST 0x02 +#define C_ERASE_INST 0x60 + +#define DUMMY_ADDR 0x00 +#define WAIT_TIME 1 + +#define ADDR_BMASK2 0x00ff0000 +#define ADDR_BMASK1 0x0000ff00 +#define ADDR_BMASK0 0x000000ff + +#define ADDR_BSHIFT2 16 +#define ADDR_BSHIFT1 8 +#define ADDR_BSHIFT0 0 + +class W25X40BV { +public: + W25X40BV(PinName mosi, PinName miso, PinName sclk, PinName cs); + + int read(int addr); // takes a 24-bit (3 bytes) address and returns the data (1 byte) at that location + int read(int a2, int a1, int a0); // takes the address in 3 separate bytes A[23,16], A[15,8], A[7,0] + + void write(int addr, int data); // takes a 24-bit (3 bytes) address and a byte of data to write at that location + 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] + + void chipErase(); // erase all data on chip + +private: + void writeEnable(); // write enable + void writeDisable(); // write disable + void chipEnable(); // chip enable + void chipDisable(); // chip disable + + SPI _spi; + DigitalOut _cs; +}; + +#endif \ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Mon Mar 19 09:55:28 2012 +0000 @@ -0,0 +1,26 @@ +#include "mbed.h" +#include"W25X40BV.h" + +Serial pc(USBTX, USBRX); // tx, rx + +int main() { + W25X40BV flash(p5, p6, p7, p8); + pc.printf("SPI init done\n"); + + flash.chipErase(); + pc.printf("Erase done\n"); + + pc.printf("%d\n", flash.read(0x00,0x00,0x06)); + pc.printf("%d\n", flash.read(0x06)); + + flash.write(0x0, 0x0, 0x06,'a'); + flash.write(0x11,'b'); + + pc.printf("%c\n", flash.read(0x06)); + pc.printf("%c\n", flash.read(0x00,0x00,0x06)); + + pc.printf("%c\n", flash.read(0x11)); + pc.printf("%c\n", flash.read(0x00,0x00,0x11)); + + return 0; +}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Mon Mar 19 09:55:28 2012 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/737756e0b479