I2C error twi.c:(.text.i2c_custom_init+0xc): undefined reference to `PinMap_I2C_SDA'

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So, we use CH32X035 and there is an error when intilizing the I2C on the ports we use. What is the problem?

#include <Wire.h>

#define SDA         PC16
#define SCL         PC19

TwoWire i2c = TwoWire(SDA,SCL);

void setup() {

  Serial.setTx(TX1);
  Serial.setRx(-1);
  Serial.begin(115200);
  Serial.println("system init");
  Serial.println(DBGMCU_GetDEVID());
  i2c.begin();
}

void loop() {
}

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so, i found the problem, for some reason the I2C was disabled in the WCH HAL for CH32X035, may i know why?

[TianpeiLee]

so, i found the problem, for some reason the I2C was disabled in the WCH HAL for CH32X035, may i know why?

Does not have the function of hardware I2C in the A-version chip，At that time, it was just for compatibility in the later stage

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mmh, are the CH32VX035 currently in production version A?

[TianpeiLee]

mmh, are the CH32VX035 currently in production version A?

No, as far as I know, the sales and sample distribution of version A are currently restricted

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@TianpeiLee ok thanks for the clarification