Miao-T / VirtualOscilloscope

MM32 uses a virtual oscilloscope via UART

Virtual Oscilloscope of MM32 Based on ShanWai Debugging Assistant

Introduction

The virtual oscilloscope on ShanWai Multifunctional Debugging Assistant could help us to observe the real-time change of data when we are debugging MM32 chip.

Characteristics of ShanWai Virtual Oscilloscope:

• Support eight channels and every channel could be hidden

• Selectable channel data type

• Scalable and removable interface

• Trace update data

Communication protocol of of ShanWai Virtual Oscilloscope:

• The format of communication protocol: [CMD][~CMD][…data…][~CMD][CMD]

• CMD = 0x03 when debugging assistant is used as virtual oscilloscope:

  [0x03][0xFC][…data…][0xFC][0x03]

• […data…] will shown as waveform. The length of data is different according to the amount of wave channel and data type.

• The microcontroller would transmit data in this order:

  1. Frame head: 0x03 0xFC
  2. The data of waveform
  3. End of frame: 0xFC 0x03

For more details: Instructions of ShanWai Debugging Assistant

Solution: Output Triangular Wave

The following codes refer to 「顶点元」STM32使用虚拟示波器

1. Configure UART

   void initUART1_IT(u32 baudrate);

2. Transmit one byte data

   void usart1_send_char(uint8_t ch);

3. Transmit an array data

   The length of the array represents the amount of channel.

   void usart1_putbuff (uint8_t *buff, uint32_t len);

4. Transmit data to upper computer according to communication protocol

   void vcan_sendware(uint8_t *wareaddr, uint32_t waresize);

5. Output triangular wave

Solution: Output ADC Wave

1. The code of UART configuration and data transmission is the same as above

2. Configure ADC

   void ADC_Configure_Init(ADC_TypeDef* ADCx);
   void Set_ADC_Clock(ADC_TypeDef* ADCx);
   void ADC_Function(ADC_TypeDef* ADCx);
   void ADC_RegularChannelConfigure(void);

3. Output ADC wave

   warebuf[1] = (float)ADC_ConvertedValue*(3.3/4096);

   

CSDN

For more details, please read 「Rose Island」山外多功能调试助手用作MM32虚拟示波器