Revision 0:e4a388ac74a0, committed 2019-08-17

Comitter:

JamesStockton

Date:

Sat Aug 17 08:49:04 2019 +0000

Commit message:

This is a library to talk to ST SPI EEPROM with part number M95xxx.

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SPIMem.cpp	Sat Aug 17 08:49:04 2019 +0000
@@ -0,0 +1,57 @@
+
+
+#include "SPIMem.h"
+
+
+SPIMem::SPIMem(PinName _mosi, PinName _miso, PinName _sckl, PinName _cs) : spi(_mosi, _miso, _sckl), cs(_cs) {
+    cs = 1;
+    
+    spi.frequency(20000000);
+}
+
+void SPIMem::writeEnable(void) {
+    cs = 0;
+    spi.write(WREN);
+    cs = 1;
+}
+
+void SPIMem::writeDisable(void) {
+    cs = 0;
+    spi.write(WRDI);
+    cs = 1;
+}
+
+void SPIMem::write(uint16_t addr, uint8_t val) {
+    writeEnable();
+    
+    cs = 0;
+    spi.write(WRITE);
+    spi.write((uint8_t)(addr >> 8));
+    spi.write((uint8_t)addr);
+    spi.write(val);
+    cs = 1;
+}
+
+int SPIMem::read(uint16_t addr) {
+    cs = 0;
+    spi.write(READ);
+    spi.write((uint8_t)(addr >> 8));
+    spi.write((uint8_t)addr);
+    int data = spi.write(0x00);
+    cs = 1;
+    
+    return data;
+}
+
+void SPIMem::burstWrite(uint16_t addr, char *data, uint16_t len) {
+    writeEnable();
+    
+    cs = 0;
+    spi.write(WRITE);
+    spi.write((uint8_t)(addr >> 8));
+    spi.write((uint8_t)addr);
+    for(int i=0; i<len; i++) {
+        spi.write(data[i]);
+    }
+    cs = 1;
+}
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SPIMem.h	Sat Aug 17 08:49:04 2019 +0000
@@ -0,0 +1,45 @@
+
+
+
+
+
+
+#ifndef SPIMEM_H
+#define SPIMEM_H
+
+#include "mbed.h"
+
+
+
+#define WREN 0x06
+#define WRDI 0x04
+#define RDSR 0x05
+#define WRSR 0x01
+#define READ 0x03
+#define WRITE 0x02
+
+#define PAGE_SIZE 32
+
+
+class SPIMem {
+public:
+
+    SPIMem(PinName _mosi, PinName _miso, PinName _sckl, PinName _cs);
+    
+    void writeEnable(void);
+    void writeDisable(void);
+    
+    void write(uint16_t addr, uint8_t val);
+    int read(uint16_t addr);
+    
+    void burstWrite(uint16_t addr, char *data, uint16_t len);
+    void burstRead(uint16_t addr, char *data, uint16_t len);
+    
+    
+    
+private:
+    SPI spi;
+    DigitalOut cs;
+};
+
+#endif
\ No newline at end of file