James Stockton / M95256

A library for interfacing to ST EEPROM memory M95***

M95256.h@0:1a2ef0cae812, 2019-02-16 (annotated)

Committer:
JamesStockton
Date:
Sat Feb 16 15:08:51 2019 +0000
Revision:
0:1a2ef0cae812
Basic start to the library for ST EEPROM

Who changed what in which revision?

UserRevisionLine numberNew contents of line
JamesStockton 0:1a2ef0cae812 1 /* Library for interfacing to the M95*** SPI EEPROM module
JamesStockton 0:1a2ef0cae812 2
JamesStockton 0:1a2ef0cae812 3 - 13/02/19 - Basic Start
JamesStockton 0:1a2ef0cae812 4
JamesStockton 0:1a2ef0cae812 5
JamesStockton 0:1a2ef0cae812 6
JamesStockton 0:1a2ef0cae812 7
JamesStockton 0:1a2ef0cae812 8
JamesStockton 0:1a2ef0cae812 9
JamesStockton 0:1a2ef0cae812 10 Enjoy
JamesStockton 0:1a2ef0cae812 11 */
JamesStockton 0:1a2ef0cae812 12
JamesStockton 0:1a2ef0cae812 13
JamesStockton 0:1a2ef0cae812 14 #ifndef M95256_H
JamesStockton 0:1a2ef0cae812 15 #define M95256_H
JamesStockton 0:1a2ef0cae812 16
JamesStockton 0:1a2ef0cae812 17 #include "mbed.h"
JamesStockton 0:1a2ef0cae812 18
JamesStockton 0:1a2ef0cae812 19
JamesStockton 0:1a2ef0cae812 20
JamesStockton 0:1a2ef0cae812 21 #define WREN 0x06
JamesStockton 0:1a2ef0cae812 22 #define WRDI 0x04
JamesStockton 0:1a2ef0cae812 23 #define RDSR 0x05
JamesStockton 0:1a2ef0cae812 24 #define WRSR 0x01
JamesStockton 0:1a2ef0cae812 25 #define READ 0x03
JamesStockton 0:1a2ef0cae812 26 #define WRITE 0x02
JamesStockton 0:1a2ef0cae812 27
JamesStockton 0:1a2ef0cae812 28
JamesStockton 0:1a2ef0cae812 29 //WRITE | 16 bit address | 8 bit data
JamesStockton 0:1a2ef0cae812 30 //READ | 16 bit address returns | 8 bit data
JamesStockton 0:1a2ef0cae812 31
JamesStockton 0:1a2ef0cae812 32
JamesStockton 0:1a2ef0cae812 33 class M95256: public SPI {
JamesStockton 0:1a2ef0cae812 34 public:
JamesStockton 0:1a2ef0cae812 35
JamesStockton 0:1a2ef0cae812 36 // _spi - pointer to SPI
JamesStockton 0:1a2ef0cae812 37 // memsize - size of memory in KB
JamesStockton 0:1a2ef0cae812 38 M95256(PinName mosi, PinName miso, PinName sckl, PinName cs, uint16_t memsize, int freq = 1000000) : SPI(mosi, miso, sckl, cs) {
JamesStockton 0:1a2ef0cae812 39 SPI::frequency(freq);
JamesStockton 0:1a2ef0cae812 40 memorysize = memsize;
JamesStockton 0:1a2ef0cae812 41 }
JamesStockton 0:1a2ef0cae812 42
JamesStockton 0:1a2ef0cae812 43 bool writeRegister(uint16_t reg, uint8_t val) {
JamesStockton 0:1a2ef0cae812 44 writeEnable();
JamesStockton 0:1a2ef0cae812 45
JamesStockton 0:1a2ef0cae812 46 SPI::lock();
JamesStockton 0:1a2ef0cae812 47 SPI::write(WRITE);
JamesStockton 0:1a2ef0cae812 48 SPI::write(reg);
JamesStockton 0:1a2ef0cae812 49 SPI::write(val);
JamesStockton 0:1a2ef0cae812 50 SPI::unlock();
JamesStockton 0:1a2ef0cae812 51
JamesStockton 0:1a2ef0cae812 52 writeDisable();
JamesStockton 0:1a2ef0cae812 53 return 1;
JamesStockton 0:1a2ef0cae812 54 }
JamesStockton 0:1a2ef0cae812 55
JamesStockton 0:1a2ef0cae812 56 uint8_t readRegister(uint16_t reg) {
JamesStockton 0:1a2ef0cae812 57 uint8_t readBuf;
JamesStockton 0:1a2ef0cae812 58
JamesStockton 0:1a2ef0cae812 59 SPI::lock();
JamesStockton 0:1a2ef0cae812 60 SPI::write(READ);
JamesStockton 0:1a2ef0cae812 61 readBuf = SPI::write(reg);
JamesStockton 0:1a2ef0cae812 62 SPI::unlock();
JamesStockton 0:1a2ef0cae812 63
JamesStockton 0:1a2ef0cae812 64 return readBuf;
JamesStockton 0:1a2ef0cae812 65 }
JamesStockton 0:1a2ef0cae812 66
JamesStockton 0:1a2ef0cae812 67
JamesStockton 0:1a2ef0cae812 68 protected:
JamesStockton 0:1a2ef0cae812 69 void writeEnable(void) {
JamesStockton 0:1a2ef0cae812 70 SPI::lock();
JamesStockton 0:1a2ef0cae812 71 SPI::write(WREN);
JamesStockton 0:1a2ef0cae812 72 SPI::unlock();
JamesStockton 0:1a2ef0cae812 73 }
JamesStockton 0:1a2ef0cae812 74
JamesStockton 0:1a2ef0cae812 75 void writeDisable(void) {
JamesStockton 0:1a2ef0cae812 76 SPI::lock();
JamesStockton 0:1a2ef0cae812 77 SPI::write(WRDI);
JamesStockton 0:1a2ef0cae812 78 SPI::unlock();
JamesStockton 0:1a2ef0cae812 79 }
JamesStockton 0:1a2ef0cae812 80
JamesStockton 0:1a2ef0cae812 81 private:
JamesStockton 0:1a2ef0cae812 82 uint16_t memorysize;
JamesStockton 0:1a2ef0cae812 83 };
JamesStockton 0:1a2ef0cae812 84
JamesStockton 0:1a2ef0cae812 85 #endif