After successful application, we finally got it, as shown in the figure above:

The last one compares the size and the feeling (pretending to be forced)

Let me quote a paragraph about the trial report

——Sashimi without mustard

The biggest feature of this board“ Freescale's Onboard OpenSDA Debugger with Cross Era Significance ”Is called“ A major innovation of Freedom platform ”。

It seems that there are already existing frontrunners.

It may be that text description alone cannot give you an intuitive understanding of this sentence. Here's a picture:

Previously, most debugging programs used this method (on the left of the figure). Later, it was (in the figure). Now it can be (on the right of the figure). We call it epochal, Freedom A major innovation of the platform (pause here).

J-Link It has always been a magic weapon for development and debugging, but sometimes it will burn out, or the circuit is unstable and the firmware will fall, so you need to open the lid and have another bottle ( jlink Dismantle, erase the memory with jumper, and brush the firmware again. These are all previous work xue happy lei interest shi ）

In addition, its interface pins are relatively too many,

For every inch of land and money pcb Sometimes it's a burden,

In order to solve this problem SWD Debugging mode is widely used, from twenty It really reduces the load when only three or five stitches are needed. But compared with j-link Its stability and functional richness are sometimes not completely satisfactory.

Integration OpenSDA Of debugging interface FRDM-K64F , only one data line is required. This has really reduced a lot of trouble for a hardware hobby who switched to software.

After turning on the light, I simply looked at the materials and went straight to the theme,

one , Enter Bootloader pattern

Press the Reset Press the key and use the USB Cable connected to development board SDAUSB Interface to PC . When My Computer appears with the name BOOTLOADER After the drive, release Reset Key. Its free space is 128KB 。

two , Installation mbed program

download FRDM-K64F_QSP.zip Compressed package（ //cache.freescale.com/files  ...  s/FRDM-K64F_QSP.zip ）, after decompression FRDM-K64F-QSP\OpenSDAv2 Applications Under directory k20dx128_k64f_if_mbed.bin Files copied to BOOTLOADER Disk down. Disconnect the development board and PC To power up the development board again. At this time, the development board is PC Identified as“ MBED ”Drive.

three Install the driver for the development board

download mbedWinSerial_16466.exe （ //mbed.org/handbook/Windows-serial-configuration ）, connect the development board and PC , and then double-click mbedWinSerial_16466.exe This file is OK.

four , on Keil Set the project under

one ）  Options - 〉 Device Select the device as MK64FN1M0XX12

two ）  Options - 〉 Debug lower Use Select as CMSIS-DAP Debugger , and then click Settings Button. Port choice SW 、 Connect Select under Reset 、 Reset Select HW RESET 。

three ）  Options - 〉 Utilities Lower Selection CMSIS-DAP Debugger

five . Start downloading and debugging

The environment is not limited to one, Start of commissioning This is just the first step,

Perfect compatibility with Arduino ™ R3

Have you found K64? Smile....

The main control board can be replaced. There is no need to jumper the gyroscope. I believe the effect will be better