This is an IIC to dual UART module with 1Mbps IIC transmission rate, and each sub UART is able to receive/transmit independent 256 bytes FIFO hardware cache. It can be used in the applications requiring the transmission of large amounts of data.
The band rate, word length, and check format of every sub UART can be set independently. The module can provide at most 2Mbps communication rate, and support 4 IIC addresses. Four such modules can be connected to one controller board to expand 8 hardware serial port.
SKU: DFR0627
- Setup band rate
- Read serial data
- Write serial data
To use this library, first download the library file, paste it into the \Arduino\libraries directory, then open the examples folder and run the demo in the folder.
/** * @fn DFRobot_IICSerial * @brief Constructor * @param pWire I2C bus pointer object, default Wire * @param subUartChannel sub UART channel, WK2132 has two sub UARTs: SUBUART_CHANNEL_1 or SUBUART_CHANNEL_2 * @param IA1 corresponds with IA1 Level(0 or 1) of DIP switch on the module, and is used for configuring * @n the IIC address of the 6th bit value(default: 1). * @n @Parameter IA0 corresponds with IA0 Level(0 or 1) of DIP switch on the module, and is used for configuring * @n IIC address of the 5th bit value(default: 1). * @n IIC address configuration: * @n 7 6 5 4 3 2 1 0 * @n 0 IA1 IA0 1 0 C1 C0 0/1 * @n IIC address only has 7 bits, while there are 8 bits for one byte, so the extra one bit will be filled as 0. * @n The 6th bit corresponds with IA1 Level of DIP switch, can be configured manually. * @n The 5th bit corresponds with IA0 Level of DIP switch, can be configured manually. * @n The 4th and 3rd bits are fixed, value 1 and 0 respectively. * @n The values of the 2nd and 1st bits are the sub UART channels, 00 for sub UART 1, 01 for sub UART 2. * @n The 0 bit represents the operation object: 0 for register, 1 for FIFO cache.*/DFRobot_IICSerial(TwoWire &wire = Wire, uint8_t subUartChannel = SUBUART_CHANNEL_1, uint8_tIA1 = 1, uint8_tIA0 = 1);
~DFRobot_IICSerial();
/** * @fn begin * @brief Init function, set band rate of sub UART * @param baud Band rate * @n Besides the commonly-used 9600, 57600, 115200, it also supports: * @n 2400, 4800, 7200, 14400, 19200, 28800, 38400, 76800, 153600, 230400, 460800, 307200, 921600 * @return Return 0 if it succeeds, otherwise return non-zero */intbegin(longunsigned baud){returnbegin(baud, IICSerial_8N1, eNormalMode, eNormal);}
/** * @fn begin * @brief Init function, set sub UART band rate, data format * @param baud Band rate * @param format Data format: IICSerial_8N1, IICSerial_8N2, IICSerial_8Z1 * @n IICSerial_8Z2, IICSerial_8O1, IICSerial_8O2, IICSerial_8E1, IICSerial_8E2 * @n IICSerial_8F1, IICSerial_8F2 * @return Return 0 if it succeeds, otherwise return non-zero */intbegin(longunsigned baud, uint8_t format){returnbegin(baud, format, eNormalMode, eNormal);}
/** * @fn end * @brief Release sub UART to clean up all registers in Sub UART. Call function begin() again to make it work.*/voidend();
/** * @fn available * @brief Get the number of bytes in receive buffer, it should be the total number of bytes in FIFO * @n receive buffer(256B) and self-defined _rx_buffer(31B). * @return Return the number of bytes in receive buffer*/virtualintavailable(void);
/** * @fn peek * @brief Return the data of 1 byte without deleting the data in the receive buffer * @return Return the readings*/virtualintpeek(void);
/** * @fn read * @brief Read 1 byte in receive buffer, this operation will delete the data in the buffer. * @return Return the readings*/virtualintread(void);
/** * @fn read * @brief Read a specified number of character from FIFO and store them into a array. * @n This operation doesn't involve receive buffer. * @param pBuf Array for storing data * @param size The number of character to be read * @return Return the readings*/size_tread(void *pBuf, size_t size);
/** * @fn flush * @brief Wait for the data to be transmited completely*/virtualvoidflush(void);
/** * @fn write * @brief Write one byte into transmit FIFO cache.The following are the overload functions of the byte of different data type. * @param n data to be written * @return Return 0 if it succeeds, otherwise return -1*/virtualsize_twrite(uint8_t n);
inlinesize_twrite(unsignedlong n) { returnwrite((uint8_t)n); }
inlinesize_twrite(long n) { returnwrite((uint8_t)n); }
inlinesize_twrite(unsignedint n) { returnwrite((uint8_t)n); }
inlinesize_twrite(int n) { returnwrite((uint8_t)n); }
/** * @fn write * @brief Write data into transmit FIFO cache * @param pBuf Store buffer for the data to be read * @param size Length of the data to be read * @return Output the number of bytes*/virtualsize_twrite(constuint8_t *pBuf, size_t size);| MCU | Work Well | Work Wrong | Untested | Remarks |
|---|---|---|---|---|
| Arduino Uno | √ | |||
| Mega2560 | √ | |||
| Leonardo | √ | |||
| ESP32 | √ | |||
| micro:bit | √ |
- 2019/08/07 - Version 1.0.0 released.
Written by Arya(xue.peng@dfrobot.com), 2019. (Welcome to our website)