Board definition for CH32X033F8P6 TSSOP20 #171
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This was referenced Jul 9, 2025
…CH32VM00X and CH32X035/X033
Added info about using software I2C
jobitjoseph
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to jobitjoseph/CH32_Arduino_Corexx
that referenced
this pull request
Oct 28, 2025
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
jobitjoseph
added a commit
to jobitjoseph/CH32_Arduino_Corexx
that referenced
this pull request
Oct 28, 2025
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
jobitjoseph
added a commit
to jobitjoseph/CH32_Arduino_Corexx
that referenced
this pull request
Oct 28, 2025
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
jobitjoseph
added a commit
to jobitjoseph/CH32_Arduino_Corexx
that referenced
this pull request
Oct 28, 2025
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
jobitjoseph
added a commit
to jobitjoseph/CH32_Arduino_Corexx
that referenced
this pull request
Oct 28, 2025
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
jobitjoseph
added a commit
to jobitjoseph/CH32_Arduino_Corexx
that referenced
this pull request
Oct 28, 2025
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
jobitjoseph
added a commit
to jobitjoseph/CH32_Arduino_Corexx
that referenced
this pull request
Oct 28, 2025
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
jobitjoseph
added a commit
to jobitjoseph/CH32_Arduino_Corexx
that referenced
this pull request
Oct 28, 2025
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
jobitjoseph
added a commit
to jobitjoseph/CH32_Arduino_Corexx
that referenced
this pull request
Oct 28, 2025
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
jobitjoseph
added a commit
to jobitjoseph/CH32_Arduino_Corexx
that referenced
this pull request
Oct 28, 2025
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
jobitjoseph
added a commit
to jobitjoseph/CH32_Arduino_Corexx
that referenced
this pull request
Oct 28, 2025
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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At the current stage it works for me. Have fun!
Info below is also in the readme of the board definition directory.
Tested features
Known issues/limitations