【GD32F310开发板试用】利用I2C接口通过温湿度传感器HDC1080读取当前环境温湿度
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非常感谢极术社区和ＧigaDevice给我机会可以进行GD32F310G-START开发板的试用，也感谢极术小姐姐，物流非常给力。
我拿到的开发板实际板载的MCU是GD32F310G8,QFN28pin封装，基于ARM CORTEX M4内核，主频72MHz,芯片内置64KB flash,8KB SRAM,两路I2C外设。
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本次试用目的是利用GD32F310的I2C0实现对HDC1080的初始化及读取环境温湿度，并利用UART口在电脑上显示出来。
1、新建工程
①首先建立一个新的项目文件夹，并在此文件夹下建立对应子文件夹，我建立的文件如下图所示，这个依个人习惯会有不同：
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② Document文件夹中存放对项目的说明文件readme.txt；将系统支持包中的GD32F3x0_Firmware_Library_V2.2.0/Firmware文件夹中的内容复制到Libraries文件夹中；Listing/Output文件夹用于存放项目编译时生成的目标文件及list文件，在MDK的魔术棒中进行设置路径；users文件夹中存放main文件及我们自已写的代码；Project文件夹中存放MDK项目文件；
③打开MDK keil5,首先要先导入GD32F310G文件支持包。
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④建立新的项目，选择所使用的ＭＣＵ，我们选择GD32F330G8,如下图所示
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⑤新项目中建立如下文件组，并导入启动文件和外设支持包。
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⑥点击魔术棒工具进行项目设置。在C/C++选项中添加include文件路径；
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⑦点击Debug选项进行GDLink的设置，要选择CMSIS_DAP Debugger,并将Reset and Run打勾。
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⑧这样整个项目的配置基本就结束了，可以在main.c文件中建立一个空循环，编译测试项目建立是否正确无误。
2、硬件映射
硬件映射的目的是按目前的硬件连接建立.h文件，如下图所示：
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因此基于开发板I2C0采用的是PB6/PB7引脚，因为需要打印读出的值，UART0使用的是PA9/PA10引脚。
3、编写代码
①UART0初始化和printf函数重定向：
void UART_TypeInit(void){gpio_deinit(UART0_GPIO_PORT);usart_deinit(USART0);rcu_periph_clock_enable(UART0_GPIO_PORT_CLK);gpio_mode_set(UART0_GPIO_PORT,GPIO_MODE_AF,GPIO_PUPD_NONE,UART0_TX_PIN | UART0_RX_PIN);gpio_output_options_set(UART0_GPIO_PORT,GPIO_OTYPE_OD,GPIO_OSPEED_MAX,UART0_TX_PIN | UART0_RX_PIN);gpio_af_set(UART0_GPIO_PORT,GPIO_AF_1,UART0_TX_PIN | UART0_RX_PIN);rcu_periph_clock_enable(UART0_CLK);usart_baudrate_set(USART0,UART0_Baudrate);usart_parity_config(USART0,USART_PM_NONE);usart_word_length_set(USART0,USART_WL_8BIT);usart_stop_bit_set(USART0,USART_STB_1BIT);usart_enable(USART0);usart_transmit_config(USART0,USART_TRANSMIT_ENABLE);usart_receive_config(USART0,USART_RECEIVE_ENABLE);}/* retarget the C library printf function to the USART */int fputc(int ch, FILE *f){usart_data_transmit(USART0, (uint8_t)ch);while(RESET == usart_flag_get(USART0,USART_FLAG_TBE)); return ch;}②I2C0外设初始化：
void I2C0_TypeInit(void){gpio_deinit(I2C0_GPIO_PORT);i2c_deinit(I2C0);rcu_periph_clock_enable(I2C0_GPIO_PORT_CLK);gpio_mode_set(I2C0_GPIO_PORT,GPIO_MODE_AF,GPIO_PUPD_NONE,I2C0_SCL_PIN | I2C0_SDA_PIN);gpio_output_options_set(I2C0_GPIO_PORT,GPIO_OTYPE_OD,GPIO_OSPEED_MAX,I2C0_SCL_PIN | I2C0_SDA_PIN);gpio_af_set(I2C0_GPIO_PORT,GPIO_AF_1,I2C0_SCL_PIN | I2C0_SDA_PIN);rcu_periph_clock_enable(I2C0_CLK);i2c_clock_config(I2C0,I2C0_Frequence,I2C_DTCY_2);i2c_mode_addr_config(I2C0,I2C_I2CMODE_ENABLE,I2C_ADDFORMAT_7BITS,I2C0_OWN_Address);i2c_enable(I2C0);i2c_ack_config(I2C0,I2C_ACK_ENABLE);}③读寄存器操作：
void I2C0_Register_Read(uint8_t* B_buffer, uint8_t read_address,uint16_t number_of_byte){ /* wait until I2C bus is idle */ while(i2c_flag_get(I2C0, I2C_FLAG_I2CBSY)); if(2 == number_of_byte){ i2c_ackpos_config(I2C0,I2C_ACKPOS_NEXT); } /* send a start condition to I2C bus */ i2c_start_on_bus(I2C0); /* wait until SBSEND bit is set */ while(!i2c_flag_get(I2C0, I2C_FLAG_SBSEND)); /* send slave address to I2C bus */ i2c_master_addressing(I2C0, HDC1080_Addr, I2C_TRANSMITTER); /* wait until ADDSEND bit is set */ while(!i2c_flag_get(I2C0, I2C_FLAG_ADDSEND)); /* clear the ADDSEND bit */ i2c_flag_clear(I2C0, I2C_FLAG_ADDSEND); /* wait until the transmit data buffer is empty */ while(SET != i2c_flag_get( I2C0 , I2C_FLAG_TBE)); /* enable I2C0*/ i2c_enable(I2C0); /* send the EEPROM's internal address to write to */ i2c_data_transmit(I2C0, read_address); /* wait until BTC bit is set */ while(!i2c_flag_get(I2C0, I2C_FLAG_BTC));delay_1ms(20); /* send a start condition to I2C bus */ i2c_start_on_bus(I2C0); /* wait until SBSEND bit is set */ while(!i2c_flag_get(I2C0, I2C_FLAG_SBSEND)); /* send slave address to I2C bus */ i2c_master_addressing(I2C0, HDC1080_Addr, I2C_RECEIVER); if(number_of_byte < 3){ /* disable acknowledge */ i2c_ack_config(I2C0,I2C_ACK_DISABLE); } /* wait until ADDSEND bit is set */ while(!i2c_flag_get(I2C0, I2C_FLAG_ADDSEND)); /* clear the ADDSEND bit */ i2c_flag_clear(I2C0,I2C_FLAG_ADDSEND); if(1 == number_of_byte){ /* send a stop condition to I2C bus */ i2c_stop_on_bus(I2C0); } /* while there is data to be read */ while(number_of_byte){ if(3 == number_of_byte){ /* wait until BTC bit is set */ while(!i2c_flag_get(I2C0, I2C_FLAG_BTC)); /* disable acknowledge */ i2c_ack_config(I2C0,I2C_ACK_DISABLE); } if(2 == number_of_byte){ /* wait until BTC bit is set */ while(!i2c_flag_get(I2C0, I2C_FLAG_BTC)); /* send a stop condition to I2C bus */ i2c_stop_on_bus(I2C0); } delay_1ms(1); /* wait until the RBNE bit is set and clear it */ if(i2c_flag_get(I2C0, I2C_FLAG_RBNE)){ /* read a byte from the EEPROM */ *B_buffer = i2c_data_receive(I2C0); /* point to the next location where the byte read will be saved */ B_buffer++; /* decrement the read bytes counter */ number_of_byte--; } } /* wait until the stop condition is finished */ while(I2C_CTL0(I2C0)&0x0200); /* enable acknowledge */ i2c_ack_config(I2C0, I2C_ACK_ENABLE); i2c_ackpos_config(I2C0, I2C_ACKPOS_CURRENT);}④写寄存器操作：
void I2C0_Byte_Write(uint8_t* P_buffer, uint8_t write_address){uint8_t i;/* wait until I2C bus is idle */while(i2c_flag_get(I2C0, I2C_FLAG_I2CBSY));/* send a start condition to I2C bus */i2c_start_on_bus(I2C0);/* wait until SBSEND bit is set */while(!i2c_flag_get(I2C0, I2C_FLAG_SBSEND));/* send slave address to I2C bus */i2c_master_addressing(I2C0, HDC1080_Addr, I2C_TRANSMITTER);/* wait until ADDSEND bit is set */while(!i2c_flag_get(I2C0, I2C_FLAG_ADDSEND));/* clear the ADDSEND bit */i2c_flag_clear(I2C0,I2C_FLAG_ADDSEND);/* wait until the transmit data buffer is empty */while(SET != i2c_flag_get(I2C0, I2C_FLAG_TBE));/* send the EEPROM's internal address to write to : only one byte address */i2c_data_transmit(I2C0, write_address);/* wait until BTC bit is set */while(!i2c_flag_get(I2C0, I2C_FLAG_BTC));for(i=0;i<2;i++){/* send the byte to be written */i2c_data_transmit(I2C0, *(P_buffer+i)); /* wait until BTC bit is set */while(!i2c_flag_get(I2C0, I2C_FLAG_TBE));}/* send a stop condition to I2C bus */i2c_stop_on_bus(I2C0);/* wait until the stop condition is finished */while(I2C_CTL0(I2C0)&0x0200);}⑤对HDC1080进行初始化并读取其ID：
void HDC1080_Init(void){uint8_tIDBuffer[2]={0};uint8_t InitSetup[2]={0x90,0x00};uint32_t SID[3]={0},MID=0,DID=0;I2C0_Byte_Write(InitSetup,CONFIGURATION);delay_1ms(20);I2C0_Register_Read(IDBuffer,DEVICE_ID,2);DID = (((uint32_t)IDBuffer[0])<<8 | IDBuffer[1]);printf("The DeviceID is 0x%x\n\r",DID);I2C0_Register_Read(IDBuffer,MANUFACTURE_ID,2);MID = ((uint16_t) IDBuffer[0]<<8 | IDBuffer[1]);printf("The ManufactureID is 0x%x\n\r",MID);I2C0_Register_Read(IDBuffer,FIRST_SID,2);SID[0] = ((uint16_t) IDBuffer[0]<<8 | IDBuffer[1]); I2C0_Register_Read(IDBuffer,MID_SID,2);SID[1] = ((uint16_t) IDBuffer[0]<<8 | IDBuffer[1]);I2C0_Register_Read(IDBuffer,LAST_SID,2);SID[2] = ((uint16_t) IDBuffer[0]<<8 | IDBuffer[1]);printf("The First bytes of the serial ID of the part is 0x%x\n\r",SID[0]);printf("The MID bytes of the serial ID of the part is 0x%x\n\r",SID[1]);printf("The Last bytes of the serial ID of the part is 0x%x\n\r",SID[2]);printf("\n\r");}⑥读取温湿度值并转换成十进制显示：
void readSensor(void){ //holds 2 bytes of data from I2C Line uint8_t Buffer_Byte[2]; //holds the total contents of the temp register uint16_t temp,hum; //holds the total contents of the humidity register double temperature=0,humidity=0 ;I2C0_Register_Read(Buffer_Byte,T_MEASUREMENT,2);temp = (((uint32_t)Buffer_Byte[0])<<8 | Buffer_Byte[1]);temperature = (double)(temp)/(65536)*165-40;printf("The temperature is %.2f\n\r",temperature);I2C0_Register_Read(Buffer_Byte,RH_MEASUREMENT,2);hum = (((uint32_t)Buffer_Byte[0])<<8 | Buffer_Byte[1]);humidity = (double)(hum)/(65536)*100;printf("The humidity is %.2f%%\n\r",humidity);}⑦main函数：
/*! \brief main function \param[in] none \param[out] none \retval none*/int main(void){/* configure periphreal */ systick_Init();LED_TypeInit();//NVIC_config();//KEY_EXTI_TypeInit();UART_TypeInit();I2C0_TypeInit();printf("DEMO START\n\r");printf("\n\r");HDC1080_Init();while(1) {readSensor();delay_1ms(1000);}}4、编译下载
①Build项目文件：
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②没有错误，直接下载到开发板中，可以打开串口看到读出温湿度每隔1S读一次并打印出来，与环境温度计比较取值还是比较准确的。
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5、试用总结
GD32F310G8芯片采用4x4 QFN28封装，结构可以设计相当紧凑，软件开发资源也是很丰富，虽然功能不算特别强大，但主流的外设基本都有囊括，在目前国产替代的大环境之下，应用前景还是相当广泛的。
对本项目有兴趣的伙伴可以通过百度网盘下载相关源码：
链接：https://pan.baidu.com/s/1rQnTQp2gdUaw_zh8G08yMg
提取码：9sas
