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SPIFlash_LowPowerLab
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add found() and regionIsEmpty()

This commit is contained in:
Felix Rusu 2021-07-20 14:10:28 -04:00
parent e80a582218
commit deed665e02
2 changed files with 31 additions and 5 deletions
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30
SPIFlash.cpp
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@ -45,8 +45,6 @@ uint8_t SPIFlash::UNIQUEID[8];
/// Release Power-down / Device ID (ABh), per section 8.2.19 of the W25X40CL datasheet.
/// This means after using the sleep() function of this library, wake() must be the first
/// function called. If other commands are used, the flash chip will ignore the commands.
/// The risk is that the code can hang if there is noise/static on the MISO line,
/// specifically noise/static that would evaluate to HIGH or 1.
/// Constructor. JedecID is optional but recommended, since this will ensure that the device is present and has a valid response
/// get this from the datasheet of your flash chip
@ -302,8 +300,34 @@ void SPIFlash::blockErase64K(uint32_t addr) {
unselect();
}
/// found() - checks there is a FLASH chip by checking the deviceID repeatedly - should be a consistent value
uint8_t SPIFlash::found() {
uint16_t deviceID=0;
wakeup(); //if sleep() was previously called, wakeup() is required or it's non responsive
for (uint8_t i=0;i<10;i++) {
uint16_t idNow = readDeviceId();
if (idNow==0 || idNow==0xffff || (i>0 && idNow != deviceID)) {
deviceID=0;
break;
}
deviceID=idNow;
}
if (deviceID==0) { //NO FLASH CHIP FOUND, ABORTING
return false;
}
return true;
}
///regionIsEmpty() - check a random flashmem byte array is all clear and can be written to (ie. it's all 0xff)
uint8_t SPIFlash::regionIsEmpty(uint32_t startAddress, uint8_t length) {
uint8_t flashBuf[length];
readBytes(startAddress, flashBuf, length);
for (uint8_t i=0;i<length;i++) if (flashBuf[i]!=0xff) return false;
return true;
}
/// Put flash memory chip into power down mode
/// WARNING: after this command, only the wake and device_id commands are recognized
/// WARNING: after this command, only the WAKEUP and DEVICE_ID commands are recognized
/// hence a wakeup() command should be invoked first before further operations
/// If a MCU soft restart is possible with flash chip left in sleep(), then a wakeup() command
/// should always be invoked before any other commands to ensure the flash chip was not left in sleep

2
SPIFlash.h
View File

@ -105,6 +105,8 @@ public:
void blockErase64K(uint32_t addr);
uint16_t readDeviceId();
uint8_t* readUniqueId();
uint8_t found();
uint8_t regionIsEmpty(uint32_t startAddress, uint8_t length);
void sleep();
void wakeup();