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Board definition for CH32X033F8P6 TSSOP20 #171
At the current stage it works for me. Have fun! Info below is also in the readme of the board definition directory. +------v------+ MISO/A6 D6~ 1-+PA6 PA5+-20 D5 SCK/A5 MOSI/A8/TX4 D7 2-+PA7=PB0 PA4+-19 D4~ CS/A4 A9/RX4 D8 3-+PB1 PC19+-18 D17 SWCLK /RST D9 4-+PB7 PA3+-17 D3~ RX2/A3* USBDM D10 5-+PC16=PC11 PA2+-16 D2~ TX2/A2 USBDP D11 6-+PC17=PC10 PA1+-15 D1~ A1 GND 7-+VSS PA0+-14 D0~ A0 SWDIO D16 8-+PC18 PC3+-13 D15~ A13 VCC 9-+VDD PA10+-12 D14 SCL/TX1 D12 10-+PA9 PA11+-11 D13 SDA/RX1 +-------------+ *A3, VREF and hardware I2C don't work on CH32X033F8P6 0-series (lot number with the penultimate bit 5 being 0). Tested features digitalWrite()/digitalRead() - can use Arduino pin numbers or PAx notation. analogWrite() - 12-bit resolution, pins marked with ~ in pinout above. analogRead() - very stable 12-bit resolution, but issues with A3/A0/PADC_VREF Serial.print() - Tested 115200 bps on Serial2 (PA2/PA3) and Serial1 (PA10/PA11), as set in variant_CH32X033F8P6.h EEPROM library - may need improvement (updated to support 122 bytes). Pin PB7 (Arduino pin 9) can be configured as hardware reset /RST using WCH Link Utility. (See issue Hardware reset pin doesn't work on CH32X033 or CH32X035 #123) Known issues/limitations Pins PA7/PB0, PC16/PC11 and PC17/PC10 cannot be used for output. Any signal on A0 seems to show on other ADC pins when disconnected. A3, PADC_VREF and I2C don't work on CH32X033F8P6 0-series (lot number with the penultimate bit 5 being 0). To counter missing I2C the Software_I2C library by Seeed Studio is a good alternative, although it needs some changes to improve compatibility in I2C scanning. openwch/arduino_core_ch32#171
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‎variants/CH32X035/CH32X033F8P/variant_CH32X033F8P.h‎

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/*
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*******************************************************************************
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* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
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* All rights reserved.
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*
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* This software component is licensed by WCH under BSD 3-Clause license,
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* the "License"; You may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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* opensource.org/licenses/BSD-3-Clause
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*
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*******************************************************************************
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*/
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#pragma once
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/* ENABLE Peripherals */
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#ifndef IDE_MENU_PERIPHERALS // defined when peripherals are enabled/disabled via the IDE menu
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#define ADC_MODULE_ENABLED
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#define UART_MODULE_ENABLED
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#define SPI_MODULE_ENABLED
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#define I2C_MODULE_ENABLED
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#define TIM_MODULE_ENABLED
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#endif
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/* CH32VX033F8P6 Pins */
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#define PA0 PIN_A0
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#define PA1 PIN_A1
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#define PA2 PIN_A2
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#define PA3 PIN_A3
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#define PA4 PIN_A4
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#define PA5 PIN_A5
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#define PA6 PIN_A6
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#define PA7 PIN_A8
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#define PB0 PIN_A8
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#define PB1 PIN_A9
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#define PB7 9 // can be configured as RST
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#define PC16 10
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#define PC17 11
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#define PA9 12
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#define PA11 13
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#define PA10 14
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#define PC3 15 // PIN_A13
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#define PC18 16
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#define PC19 17
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// Alternate pins number TODO
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#define PA0_ALT1 (PA0 | ALT1)
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#define PA1_ALT1 (PA1 | ALT1)
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#define PA2_ALT1 (PA2 | ALT1)
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#define PA3_ALT1 (PA3 | ALT1)
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#define PA4_ALT1 (PA4 | ALT1)
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#define PA5_ALT1 (PA5 | ALT1)
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#define PA6_ALT1 (PA6 | ALT1)
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#define PA7_ALT1 (PA7 | ALT1)
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#define PB0_ALT1 (PB0 | ALT1)
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#define PB1_ALT1 (PB1 | ALT1)
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#define PC0_ALT1 (PC0 | ALT1)
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#define PC3_ALT1 (PC3 | ALT1)
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#define NUM_DIGITAL_PINS 18 // 27
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#define NUM_ANALOG_INPUTS 14 // 14 to allow PIN_13/A13 definition for PC3 (no A10, A11, A12 on X033F8P6)
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#define ADC_RESOLUTION 12
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// On-board LED pin number
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#ifndef LED_BUILTIN
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#define LED_BUILTIN PNUM_NOT_DEFINED
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#endif
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// On-board user button
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#ifndef USER_BTN
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#define USER_BTN PNUM_NOT_DEFINED
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#endif
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// SPI definitions
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#ifndef PIN_SPI_SS
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#define PIN_SPI_SS PA4
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#endif
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#ifndef PIN_SPI_MOSI
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#define PIN_SPI_MOSI PA7
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#endif
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#ifndef PIN_SPI_MISO
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#define PIN_SPI_MISO PA6
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#endif
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#ifndef PIN_SPI_SCK
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#define PIN_SPI_SCK PA5
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#endif
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// I2C definitions
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#ifndef PIN_WIRE_SDA
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#define PIN_WIRE_SDA PC17
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#endif
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#ifndef PIN_WIRE_SCL
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#define PIN_WIRE_SCL PC16
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#endif
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// Timer Definitions
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#ifndef TIMER_TONE
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#define TIMER_TONE TIM3
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#endif
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#ifndef TIMER_SERVO
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#define TIMER_SERVO TIM2
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#endif
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// UART Definitions
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#ifndef SERIAL_UART_INSTANCES
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// Define the number of UART instances that can be used.
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// For CH32X033F8P6 SSOP20 the supported maximum is currently two.
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// These are UART1 and UART2 on pins PA10=TX1_1, PA11=RX1_1 and on PA2=TX2, PA3=RX2
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// (two instances will cost 132/136 bytes more flash/ram than one instance)
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#define SERIAL_UART_INSTANCES 2 // select 1 or 2 instances
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#endif
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#if (SERIAL_UART_INSTANCES==1)
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// If using only one UART inactance, select which to use: UART1 or UART2
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#ifndef SERIAL_UART_INSTANCE
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// #define SERIAL_UART_INSTANCE 1 // UART1: PA10=TX1_1, PA11=RX1_1
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#define SERIAL_UART_INSTANCE 2 // UART2: PA2=TX2, PA3=RX2
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#endif
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#else
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// multiple instances, max 2 for CH32X033F8P SSOP20
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// NOTE: do not define SERIAL_UART_INSTANCE when using multiple instances!
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#undef SERIAL_UART_INSTANCE
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#define ENABLE_HWSERIAL1 1
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#define ENABLE_HWSERIAL2 1
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#endif
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// Default pin used for generic 'Serial' instance
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// Mandatory for Firmata
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// For CH32X033F8P6 serial pins RX2=PA3/TX2=PA2 or alternative RX1_1=PA11/TX1_1=PA10
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// Pins used for Serial2 instance (used by HardwareSerial constructor)
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#if (SERIAL_UART_INSTANCES==1)
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// one single UART instance, specify which oins to be used
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#if (SERIAL_UART_INSTANCE==1)
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// Use UART1 alternative pins RX1_1/TX1_1 (PA11/PA10)
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#ifndef PIN_SERIAL_RX
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#define PIN_SERIAL_RX PA11
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#endif
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#ifndef PIN_SERIAL_TX
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#define PIN_SERIAL_TX PA10
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#endif
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#elif (SERIAL_UART_INSTANCE==2)
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// Use UART2 RX2/TX2 (PA3/PA2)
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#ifndef PIN_SERIAL_RX
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#define PIN_SERIAL_RX PA3
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#endif
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#ifndef PIN_SERIAL_TX
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#define PIN_SERIAL_TX PA2
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#endif
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#endif
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#else
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// multiple instances. Define each pin for each UART (Serial=Serial2)
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#define Serial Serial2 // specify which UART to use as 'Serial'
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#ifndef PIN_SERIAL_RX
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#define PIN_SERIAL_RX PA11 // supported: PA3=RX2, alternative PA11=RX1_1 (X035: PB11)
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#endif
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#ifndef PIN_SERIAL_TX
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#define PIN_SERIAL_TX PA10 // supported: PA2=TX2, alternative PA10=TX1_1 (X035: PB10)
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#endif
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#ifndef PIN_SERIAL_RX2
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#define PIN_SERIAL_RX2 PA3 // supported: PA3=RX2, alternative PA11=RX1_1 (X035: PB11)
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#endif
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#ifndef PIN_SERIAL_TX2
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#define PIN_SERIAL_TX2 PA2 // supported: PA2=TX2, alternative PA10=TX1_1 (X035: PB10)
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#endif
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#endif
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/*----------------------------------------------------------------------------
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* Arduino objects - C++ only
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*----------------------------------------------------------------------------*/
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#ifdef __cplusplus
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// These serial port names are intended to allow libraries and architecture-neutral
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// sketches to automatically default to the correct port name for a particular type
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// of use. For example, a GPS module would normally connect to SERIAL_PORT_HARDWARE_OPEN,
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// the first hardware serial port whose RX/TX pins are not dedicated to another use.
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//
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// SERIAL_PORT_MONITOR Port which normally prints to the Arduino Serial Monitor
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//
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// SERIAL_PORT_USBVIRTUAL Port which is USB virtual serial
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//
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// SERIAL_PORT_LINUXBRIDGE Port which connects to a Linux system via Bridge library
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//
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// SERIAL_PORT_HARDWARE Hardware serial port, physical RX & TX pins.
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//
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// SERIAL_PORT_HARDWARE_OPEN Hardware serial ports which are open for use. Their RX & TX
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// pins are NOT connected to anything by default.
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#ifndef SERIAL_PORT_MONITOR
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#define SERIAL_PORT_MONITOR Serial
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#endif
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#ifndef SERIAL_PORT_HARDWARE
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#define SERIAL_PORT_HARDWARE Serial
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#endif
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#endif
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