Uint8_t readByte(uint32_t _addr, bool fastRead = false) - Write / Read Bytes -//īool writeByte(uint32_t _addr, uint8_t data, bool errorCheck = true) A flash memory device typically consists of one or more flash memory chips (each holding many flash memory cells), along with a separate flash memory controller chip. NOR flash memory allows a single machine word to be written – to an erased location – or read independently. NAND flash memory, however, may be erased, written, and read in blocks (or pages), which generally are much smaller than the entire device. EPROMs had to be erased completely before they could be rewritten. Toshiba began marketing flash memory in 1987. They differ at the circuit level: in NAND flash, the relationship between the bit line and the word lines resembles a NAND gate in NOR flash, it resembles a NOR gate this depends on whether the state of the bit line or word lines is pulled high or low.įlash memory, a type of floating-gate memory, was invented at Toshiba in 1980 and is based on EEPROM technology. NAND flash and NOR flash use the same cell design, consisting of floating gate MOSFETs. The two main types of flash memory, NOR flash and NAND flash, are named for the NOR and NAND logic gates. They are a single chip that can be managed via SPI and have high-speed access and low power consumption.įlash memory is an electronic non-volatile computer memory storage medium that can be electrically erased and reprogrammed. Today we are going to see the SPI Flash memory (NOR Flash). The performance probably is not a big thing.For devices like Arduino UNO, we can use use the SPI Flash with a basic and very light library, but you can manage a good quantity of memory (from 256Kb to 64Mb), and it’s enough for a lot of projects, It’s possible to use a complete filesystem, but I don’t recommend it with low-resource devices, we are going to see how to use a filesystem with devices like Arduino SAMD or esp devices. Why do you want to use u8g2 and u8x8 together? The flicker caused by using u8g2 and u8x8 co-usage can not be avoided in general (altough it can be minimized by clever programming techniques). This will avoid the loop()-caused flicker. Then, you can update your screen whenever the isChanged variable is set to true: It is a good habit to introduce a variable ("isChanged") which will be set to true if something is changed. The loop() thing: Usually you will only update your screen if there is something to update. The second reason (maybe 20%) is contributed by the use of u8g2 and u8x8 together. Now the question is: Why does it flicker, what is the root cause for this and how to avoid this.Īnswer: There are two reasons: First the example is bad for this because of the Ardunio-loop() thing which probably contributes by 80% for the flickering. Then your problem is: "too much of flicker" tFont(u8x8_font_chroma48medium8_r) Ĭoming back to the original question: Can we use u8g2 and u8x8 together? ndBuffer() // transfer internal memory to the display U8g2.drawFrame(0,10,20,10) // write something to the internal memory tFont(u8g2_font_ncenB08_tr) // choose a suitable font U8g2.clearBuffer() // clear the internal memory I want to speed things up by using the u8x8 library for text, but would still like some of the graphics the u8g2 offers.Īttached is the code, you will see the text printed by the u8x8 library flickers pretty badly.Īny help would be much appreicated! Thank you #include Is it possible to use these two libraries together? I want to display text using the u8x8 lib and do some graphics using the u8g2 library.
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