46 lines
1.9 KiB
Markdown
46 lines
1.9 KiB
Markdown
# Hardware FAQ
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## What is this FAQ for?
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This FAQ addresses hardware-specific issues relating to the NodeMcu firmware on
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NoceMCU Inc Devkits and other ESP-8266 modules.
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## Hardware Specifics
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## Why file writes fail all the time on DEVKIT V1.0?
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NodeMCU DEVKIT V1.0 uses ESP12-E-DIO(ESP-12-D) module. This module runs the
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Flash memory in [Dual IO SPI](#whats-the-different-between-dio-and-qio-mode)
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(DIO) mode. This firmware will not be correctly loaded if you use old flashtool
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versions, and the filesystem will not work if you used a pre 0.9.6 firmware
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version (<0.9.5) or old. The easiest way to resolve this problem s update all
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the firmware and flash tool to current version.
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- Use the latest [esptool.py](https://github.com/themadinventor/esptool) with
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DIO support and command option to flash firmware, or
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- Use the latest [NodeMCU flasher](https://github.com/NodeMCU/NodeMCU-flasher)
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with default option. (You must select the `restore to default` option in advanced
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menu tab), or
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- Use the latest Espressif's flash tool -- see [this Espressif forum
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topic](http://bbs.espressif.com/viewtopic.php?f=5&t=433) (without auto download
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support). Use DIO mode and 32M flash size option, and flash latest firmware to
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0x00000. Before flashing firmware, remember to hold FLASH button, and press RST
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button once. Note that the new NodeMCU our firmware download tool, when
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released, will be capable of flashing firmware automatically without any button
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presses.
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## What's the different between DIO and QIO mode?
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Whether DIO or QIO modes are available depends on the physical connection
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between the ESP8266 CPU and its onboard flash chip. QIO connects to the flash
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using 5 data pins as compared to DIO's 3. This frees up an extra 2 IO pins for
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GPIO use, but this also halves the read/write data-rate to Flash compared to
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QIO modules.
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## How to use DEVKIT V0.9 on Mac OS X?
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<TODO>
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### How does DEVKIT use DTR and RTS enter download mode?
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<TODO>
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