驱动代码-如何使用-有什么中文资料面包板社区

本驱动代码适用于ADI公司的AD779X系列ADC芯片，所有与硬件平台相关的代码都最大化的提取了出来，达到了最优化的移植性，本文档及代码旨在分享个人的开发工作，减少工程师们的开发周期，提高大家的工作效率。测试时硬件平台我使用的是一块cortex-M3的单片机来和AD779X通信，具体型号为NXP公司的LPC1752单片机，原理图如下：由上图可以看到AD779X的基准芯片采用ADI公司的ADR34XX系列芯片，AD779X与单片机的管脚连接有SCLK/CS/DI/DOUT共四个管脚，即AD779X的数字串行通信引脚。 A779X芯片的驱动代码整理后已经高度模块化，移植起来非常方便，整个移植过程只需要修改三个非常简单的地方即可使用，加快开发进度：管脚定义及功能设置（与单片机相连的管脚定义，输入输出设置） /***********PIN define**************************/ #define AD779x_DIN (16) #define AD779x_CS (17) #define AD779x_SCLK (18) #define AD779x_DOUTRDY (110) /******************************************************** *FUNCTION:Set pin function on MCU **********************************************************/ void McuGpioSet(void) 管脚写1或写0功能函数 /******************************************************* *FUNCTION: AD779X PIN state set *PARAMETER: PIN---serial pin on AD779X,may nex value: * AD779X_DIN/AD779X_CS/AD779X_SCLK/AD779X_DOUTRDY * Data---set value:0/1 *******************************************************/ void AD779x_PIN_SET(unsigned int PIN, unsigned char Data) { if(Data) LPC_GPIO2-FIOSET |= PIN; else LPC_GPIO2-FIOCLR |=PIN; } 管脚电平状态读取函数 /****************************************************** *FUNCITON:AD779X PIN STATE READ *PARAMETER:PIN---serial pin,may next value: * AD779X_DOUTRDY *******************************************************/ unsigned char AD779X_PIN_READ(unsigned int PIN) { unsigned char VarDat; if(LPC_GPIO2-FIOPIN PIN) VarDat=1; else VarDat=0; return VarDat; } 从上面描述可以看出，芯片AD779X的移植非常简单高效，为项目开发节约时间，提高工作效率，一下为高度模块化的子模块函数，与平台无关，移植时不用修改： /****************************************************** *FUNCTION: AD779X serial pin initial *******************************************************/ void AD779xInitialization(void) /************************************************* *FUNCTION: Serial interface reset *************************************************/ void AD779xSoftwareReset(void) /************************************************** *FUNCTION: write data in registers *PARAMETER:RegisterAddress---register address,may next value: * COMMUNICATIONS, * IO, * MODE, * CONFIGURATION, * OFFSET, * FULLSCALE * RegisterBuffer---register data buffer point * CHIP---chip choose,may next value: * AD7794 * AD7795 * AD7796 * AD7797 **************************************************/ void AD779xWriteRegister(unsigned char RegisterAddress, unsigned long int *RegisterBuffer,unsigned char CHIP) /************************************************************************ *FUNCTION:read data from register *PARAMETER:RegisterAddress---register address , may next value: * STATUS, * ID, * MODE, * CONFIGURATION, * OFFSET, * FULLSCALE, * DATA * RegisterBuffer---data buffer point * CHIP---chip choose,may next value: * AD7794 * AD7795 * AD7796 * AD7797 *************************************************************************/ void AD779xReadRegister(unsigned char RegisterAddress, unsigned long int *RegisterBuffer,unsigned char CHIP) /************************************************************************** *FUNCTION:Read result for single conversion mode *PARAMETER: DataIndex---the sotre place in DataBuffer * DataBuffer---data store buffer * CHIP---which type,may next value: * AD7792/AD7793/AD7794/AD7795/AD7796/AD7797 **************************************************************************/ void AD779xReadResultForSingleConversion(unsigned char DataIndex, unsigned long int *DataBuffer,unsigned char CHIP) /************************************************************************** *FUNCTION:Read result for continuous conversion mode *PARAMETER: StartIndex---the first store place in DataBuffer * NumberOfData---data numbers * DataBuffer---data store buffer * CHIP---which type,may next value: * AD7792/AD7793/AD7794/AD7795/AD7796/AD7797 **************************************************************************/ void AD779xReadResultForContinuousConversion(unsigned char StartIndex, unsigned char NumberOfData, unsigned long int *DataBuffer,unsigned char CHIP) /************************************************************************** *FUNCTION:Read result for continuous read mode *PARAMETER: StartIndex---the first store place in DataBuffer * NumberOfData---data numbers * DataBuffer---data store buffer * CHIP---which type,may next value: * AD7792/AD7793/AD7794/AD7795/AD7796/AD7797 **************************************************************************/ void AD779xReadResultForContinuousRead(unsigned char StartIndex, unsigned char NumberOfData, unsigned long int *DataBuffer,unsigned char CHIP) /************************************************************************* *FUNCITON:Exit continous read mode *PARAMETER: CHIP---which type,may next value: * AD7792/AD7793/AD7794/AD7795/AD7796/AD7797 **************************************************************************/ void AD779xExitContinuousRead(unsigned char CHIP) 以上为该芯片驱动代码所有的子模块函数，在主函数中就可以调用这些子函数配置寄存器和读取ADC的值，下面代码即使用连续转换方式（Continuous Conversion）读取通道2的数据，然后将读取的数据通过UART接口打印输出，该代码在实际的硬件平台调试通过： /********************************************************************************************************* ** Function name: main ** Descriptions: ** input parameters: 无 ** output parameters: 无 ** Returned value: 无 *********************************************************************************************************/ int main (void) { SystemInit(); /*MCU system initial*/ uart0Init (); /*uart initial*/ printf("General Platform v1.0!\n"); myDelay(1000); AD779xInitialization(); AD779xSoftwareReset(); NopDely(100*50); // read ID register AD779xRegisters =WRITE_ENABLE|READ|RS_ID|CREAD_DISABLE; AD779xWriteRegister(COMMUNICATIONS, AD779xRegisters,AD7794); AD779xReadRegister(ID, AD779xRegisters,AD7794); printf("RESET ID REGISTER=0x%04X\n",AD779xRegisters ); // read STATUS register AD779xRegisters =WRITE_ENABLE|READ|RS_STATUS|CREAD_DISABLE; AD779xWriteRegister(COMMUNICATIONS, AD779xRegisters,AD7794); AD779xReadRegister(STATUS, AD779xRegisters,AD7794); printf("RESET STATUS REGISTER=0x%04X\n",AD779xRegisters ); //WRITE MODE REGISTER AD779xRegisters =WRITE_ENABLE|WRITE|RS_MODE|CREAD_DISABLE; AD779xWriteRegister(COMMUNICATIONS, AD779xRegisters,AD7794); AD779xRegisters =MD_CONTINUOUS_CONVERSION|PSW_ENABLE|AMP_CM_ENABLE|CLK_INTERNAL_OUTPUT_ENABLE|CHOP_DISABLE|FILTER_UPDATE_RATE_242; AD779xWriteRegister(MODE, AD779xRegisters,AD7794); //WRITE CONFIGURATION AD779xRegisters =WRITE_ENABLE|WRITE|RS_CONFIGURATION|CREAD_DISABLE; AD779xWriteRegister(COMMUNICATIONS, AD779xRegisters,AD7794); AD779xRegisters =VBIAS_DISABLE|BO_DISABLE|BIPOLAR|BOOST_DISABLE|GAIN_1|REFSEL_EXTERNAL_REF1|REF_DETECT_DIASBLE|BUF_ENABLE|CHANNEL_AIN2; AD779xWriteRegister(CONFIGURATION, AD779xRegisters,AD7794); while(1) { AD779xReadResultForContinuousConversion(0, 1, AD779xData,AD7794); printf("convertion data1:0x%03X,data2:0x%03X\n",AD779xData ,AD779xData ); myDelay(1000); } } http://item.taobao.com/item.htm?id=43307575672；

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