Diff: W25Q16BV.cpp

Revision:

0:3ecd25651727

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/W25Q16BV.cpp	Tue May 20 10:30:34 2014 +0000
@@ -0,0 +1,252 @@
+// W25Q16BV.cpp
+
+#include"W25Q16BV.h"
+
+// CONSTRUCTOR 
+W25Q16BV::W25Q16BV(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();
+
+    exitDeepPowerDown();
+    // The SPI Flash cannot safely be accessed the first 1-10 ms after power ON
+//    wait_us(WAIT_US_TPUW);
+}
+
+
+// READING
+int W25Q16BV::readByte(int addr) {
+    chipEnable();
+    _spi.write(R_INST);
+    _spi.write((addr >> 16) & 0xff);
+    _spi.write((addr >>  8) & 0xff);
+    _spi.write((addr      ) & 0xff);
+    int response = _spi.write(DUMMY_ADDR);
+    chipDisable();
+    return response;
+}
+int W25Q16BV::readByte(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;
+}
+void W25Q16BV::readStream(int addr, char* buf, int count) {
+    if (count < 1)
+        return;
+    chipEnable();
+    _spi.write(R_INST);
+    _spi.write((addr >> 16) & 0xff);
+    _spi.write((addr >>  8) & 0xff);
+    _spi.write((addr      ) & 0xff);
+    for (int i = 0; i < count; i++)
+        buf[i] =  _spi.write(DUMMY_ADDR);
+    chipDisable();
+}
+void W25Q16BV::readJEDEC(uint8_t* manId, uint8_t* memType, uint8_t* cap)
+{
+    chipEnable();
+    _spi.write(JDEC_INST);
+    *manId = _spi.write(DUMMY_ADDR);
+    *memType = _spi.write(DUMMY_ADDR);
+    *cap = _spi.write(DUMMY_ADDR);
+    chipDisable();
+}
+uint8_t W25Q16BV::readStatus1()
+{
+  uint8_t status;
+  chipEnable();
+  _spi.write(STATUS1_INST);
+  status = _spi.write(DUMMY_ADDR);
+  chipDisable();
+  return status;
+}
+uint8_t W25Q16BV::readStatus2()
+{
+  uint8_t status;
+  chipEnable();
+  _spi.write(STATUS2_INST);
+  status = _spi.write(DUMMY_ADDR);
+  chipDisable();
+  return status;
+}
+
+// WRITING
+void W25Q16BV::writeByte(int addr, int data) {
+    writeEnable();
+    chipEnable();
+    _spi.write(W_INST);
+    _spi.write((addr >> 16) & 0xff);
+    _spi.write((addr >>  8) & 0xff);
+    _spi.write((addr      ) & 0xff);
+    _spi.write(data);
+    chipDisable();
+    writeDisable();
+//    wait_us(WAIT_US_TBP);
+    waitWhileBusy();
+}
+void W25Q16BV::writeByte(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_us(WAIT_US_TBP);
+    waitWhileBusy();
+}
+#if 0
+void W25Q16BV::writeStream(int addr, char* buf, int count) {
+    if (count < 1)
+        return;
+    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);
+    for (int i = 0; i < count; i++)
+        _spi.write(buf[i]);
+    chipDisable();
+    writeDisable();
+    wait(WAIT_TIME_MS);
+}
+#else
+void W25Q16BV::writeStream(int addr, char* buf, int count)
+{
+  int left = count;
+  int offset = 0;
+  int len = 0;
+  
+  if (count < 1) {
+    return;
+  }
+    
+  // find length of first page write
+  if ((addr / PAGE_SIZE) != ((addr + count) / PAGE_SIZE)) {
+    //spans across at least one boundary
+    len = PAGE_SIZE - (addr % PAGE_SIZE);
+  } else {
+    // ends inside same page => use normal length
+    len = count % PAGE_SIZE;
+  }
+  
+  //break up large write operation into several page write operations
+  while (left > 0) {
+    writeEnable();
+    chipEnable();
+    _spi.write(W_INST);
+    _spi.write(((addr + offset) >> 16) & 0xff);
+    _spi.write(((addr + offset) >>  8) & 0xff);
+    _spi.write(((addr + offset)      ) & 0xff);
+    for (int i = 0; i < len; i++) {
+      _spi.write(buf[offset + i]);
+    }
+    chipDisable();
+    //writeDisable();
+    
+    offset += len;
+    left -= len;
+    len = (left < PAGE_SIZE) ? left : PAGE_SIZE;
+    
+    //wait_us(WAIT_US_TPP);
+    waitWhileBusy();
+  }
+}
+#endif
+
+//ERASING
+void W25Q16BV::chipErase() {
+    writeEnable();
+    chipEnable();
+    _spi.write(C_ERASE_INST);
+    chipDisable();
+//    writeDisable();
+//    wait_us(WAIT_US_TCE);
+    waitWhileBusy();
+}
+bool W25Q16BV::blockErase(int startBlock, int num) {
+  if ((num < 1) || (startBlock < 0) || ((startBlock+num) > NUM_64KB_BLOCKS)) {
+    return false;
+  }
+  for (int i = 0; i < num; i++) {
+    writeEnable();
+    chipEnable();
+    _spi.write(B_ERASE_INST);
+    _spi.write(startBlock + i);
+    _spi.write(0);
+    _spi.write(0);
+    chipDisable();
+//    writeDisable();
+//    wait_us(WAIT_US_TBE);
+    waitWhileBusy();
+  }
+  return true;
+}
+bool W25Q16BV::sectorErase(int startSector, int num) {
+  if ((num < 1) || (startSector < 0) || ((startSector+num) > NUM_SECTORS)) {
+    return false;
+  }
+  int addr = startSector * SECTOR_SIZE;
+  for (int i = 0; i < num; i++) {
+    writeEnable();
+    chipEnable();
+    _spi.write(S_ERASE_INST);
+    _spi.write((addr >> 16) & 0xff);
+    _spi.write((addr >>  8) & 0xff);
+    _spi.write((addr      ) & 0xff);
+    chipDisable();
+//    writeDisable();
+//    wait_us(WAIT_US_TSE);
+    waitWhileBusy();
+    
+    addr += SECTOR_SIZE;
+  }
+  return true;
+}
+
+// Wakeup from deep power down (default state)
+void W25Q16BV::exitDeepPowerDown() {
+    chipEnable();
+    _spi.write(POWERUP_INST);
+    chipDisable();
+  wait_us(WAIT_US_TRES1);
+}
+
+void W25Q16BV::waitWhileBusy() {
+  uint8_t status = 0;
+  int i = 0;
+
+  do {
+    for (i = 0; i < 0x2000; i++);
+
+    status = readStatus1();
+  }
+  while ((status & STATUS_1_BUSY) != 0);
+}
+
+//ENABLE/DISABLE (private functions)
+void W25Q16BV::writeEnable() {
+    chipEnable();
+    _spi.write(WE_INST);
+    chipDisable();
+}
+void W25Q16BV::writeDisable() {
+    chipEnable();
+    _spi.write(WD_INST);
+    chipDisable();
+}
+void W25Q16BV::chipEnable() {
+    _cs = 0;
+}
+void W25Q16BV::chipDisable() {
+    _cs = 1;
+}
+