: Ensure you are using thermal paper and that it is loaded with the shiny side facing the print head.
/** * @brief Prints a raster bitmap image. * @param data Pointer to image byte array. * @param width Width of the image in bytes (usually 48 or 384 dots). * @param height Height of the image in dots. */ jk5801h_status_t JK5801H_PrintBitmap(const uint8_t *data, uint16_t width, uint16_t height); thermal printer jk5801h driver verified
Use only these verified sources: