Cortex M0 LPC1114 program download failed-EEWORLD

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LPC1114 can automatically ISP download programs. Because before it leaves the factory, the bootloader program is solidified in the chip, and the chip leads to the boot pin. The bootloader is used to guide the microcontroller to execute the task of downloading the program or executing the existing program in the chip. This judgment is determined by the high and low levels of the external boot pin.

After the microcontroller is powered on, the bootloader program will be run first. This program relies on the internal IRC clock to work. The bootloader first checks the level of the boot pin. If it is low, it will execute the download task and wait for the program to be downloaded; if it is high, it will execute the existing user program in the chip. Simple!

Manual download:

According to the principle of bootloader, first connect the boot pin to ground, then power on the microcontroller, and then use flash magic to download the program. After downloading the program, disconnect the boot pin from the ground, then power on, and the program just downloaded will run.

Automatic Download:

Connect the DTR of the serial port to the reset pin of the microcontroller, and connect the RTS to the boot pin to realize automatic ISP. Find the program to be downloaded and directly click the flash magic download button.

When downloading manually, the MCU and the computer serial port are connected by 3 wires:
MCU Computer serial port
RXD—–TXD
TXD—–RXD
GND—–GND

When downloading automatically, the MCU and the computer serial port are connected with 5 lines
MCU Computer serial port
RXD——-TXD
TXD——-RXD
GND——-GND
RESET——-DTR
BOOT——-RTS

Generally, download failures are caused by not connecting DTR and RTS. On Ration's lpc1114 development board, the ISP button is used to connect DTR and RTS, so you have to press it to download the program. Or you can use the manual download method.

When running the program, especially the serial port program, in order to prevent errors, disconnect the lines connecting DTR, RTS and the microcontroller. On the Ration lpc1114 development board, flip up the ISP switch.

Keywords：cortex lpc1114 Reference address：Cortex M0 LPC1114 program download failed

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