bluepill firmware that turns it into a USB-I2C multimaster gateway with a simple serial protocol.
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#include "logging.h"
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#include "main.h"
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int _write(int file, char *ptr, int len)
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{
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HAL_UART_Transmit(&huart1, (uint8_t*) ptr, len, 1000);
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return len;
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}
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