/******************************************************* Program function: Use the PWM waveform output from P2.3 and P2.4 to drive the LED to flash.The duty cycle of the square wave output from P2.3 p
ARM's exception vector table address exception 0x0000,0000 reset 0x0000,0004 undefined instruction...... When an exception occurs (undefined instruction exception), is 0x0000,0004 sent to the PC, or i
There are at least four conditions for entering the serial port interrupt: first, the serial port is enabled; second, the serial port interrupt is enabled; third, the general interrupt is turned on; f