Sharing about the famous LCP1114FN28

The mbed board I ordered has arrived

I have tested only LED1 and UART (printf). It worked fine out of the box with mbed in Windows 7, but seems to have some issue with Windows 10.

(Note: this is not the only board I have problem with Windows 10).

The mbed website don't have much technical details of the board. However, the

schematic can be found in http://doc.switch-science.com/schematic/mbed_LPC1114FN28/mbed_LPC1114FN28.pdf

Note:

• The microcontroller is powered by USB, so on the breadboard you don't have to hook up separate power supply.
• CMSIS-DAP function works fine and I can program with Keil MDK

The only problem is that the crystal pins on the header (pin 19 & 20) are not connected. The board has the pads for SMD crystal and coupling caps under the LPC1114FN28 but is not populated (fair enough, as they won't know what frequency people wanted.)

But because the pins 19 & 20 at the header is not connected to the microcontroller, you cannot connect crystal on the breadboard. So the clock source is limited to internal clocks.

(unless you do some modification to hook up the pins to the crystal pads, which is possible.)

I haven't try out all the functionalities but in overall it seems to be a nice board (especially this seems to be the only one that allows you to replace the chip! ).

The mbed board I ordered has arrived

I have tested only LED1 and UART (printf). It worked fine out of the box with mbed in Windows 7, but seems to have some issue with Windows 10.

(Note: this is not the only board I have problem with Windows 10).

The mbed website don't have much technical details of the board. However, the

schematic can be found in http://doc.switch-science.com/schematic/mbed_LPC1114FN28/mbed_LPC1114FN28.pdf

Note:

• The microcontroller is powered by USB, so on the breadboard you don't have to hook up separate power supply.
• CMSIS-DAP function works fine and I can program with Keil MDK

The only problem is that the crystal pins on the header (pin 19 & 20) are not connected. The board has the pads for SMD crystal and coupling caps under the LPC1114FN28 but is not populated (fair enough, as they won't know what frequency people wanted.)

But because the pins 19 & 20 at the header is not connected to the microcontroller, you cannot connect crystal on the breadboard. So the clock source is limited to internal clocks.

(unless you do some modification to hook up the pins to the crystal pads, which is possible.)

I haven't try out all the functionalities but in overall it seems to be a nice board (especially this seems to be the only one that allows you to replace the chip! ).

Update:

After updating the firmware the board works fine with Windows 10.

The firmware can be found here: Firmware LPC1114FN28 - | mbed

Thanks for this sharing jyiu