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9 years, 7 months ago.
How to use USB0 as UART serial with the FRDM-K64F
How do I use the left side USB0 port for serial UART data communication between a PC running Tera-Term software and the FRDM-K64, per the following image where USB0 is circled in blue:
I tested the following code which works: http://developer.mbed.org/handbook/USBSerial
USBSerial
include "mbed.h"
#include "USBSerial.h"
//Virtual serial port over USB
USBSerial serial;
int main(void) {
while(1)
{
serial.printf("I am a virtual serial port\r\n");
wait(1);
}
}
.
The default baud rate seems to be 9600. How would I change this?
I looked in the mbed source code as follows and could not find the pin name for USB0: https://github.com/mbedmicro/mbed/blob/master/libraries/mbed/targets/hal/TARGET_Freescale/TARGET_KPSDK_MCUS/TARGET_MCU_K64F/TARGET_FRDM/PeripheralNames.h and https://github.com/mbedmicro/mbed/blob/master/libraries/mbed/targets/hal/TARGET_Freescale/TARGET_KPSDK_MCUS/TARGET_MCU_K64F/TARGET_FRDM/PinNames.h
1 Answer
9 years, 7 months ago.
As you found that USB port is a different one: It runs directly on the K64F (while the other one is translated by the interface IC), and so you don't need to define pins, it runs a complete USB stack on your K64F. Baud rate is irrelevant since there is no real UART playing a role, if you set baud on 115200 in your terminal program it will still work.