TM4c123x I2C配置信息解析

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问答对人有帮助，内容完整，我也想知道答案0 本帖最后由一只耳朵怪于 2018-6-11 11:55 编辑 I2C的初始化 //ini tialize I2C module 0//Slightly modified version of TI's example codevoid InitI2C0(void)[ //enable I2C module 0 SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C0); //reset module SysCtlPeripheralReset(SYSCTL_PERIPH_I2C0); //enable GPIO peripheral that contains I2C 0 SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB); // Configure the pin muxing for I2C0 functions on port B2 and B3. GPIOPinConfigure(GPIO_PB2_I2C0SCL); GPIOPinConfigure(GPIO_PB3_I2C0SDA); // Select the I2C function for these pins. GPIOPinTypeI2CSCL(GPIO_PORTB_BASE, GPIO_PIN_2); GPIOPinTypeI2C(GPIO_PORTB_BASE, GPIO_PIN_3); // Enable and initialize the I2C0 master module. Use the system clock for // the I2C0 module. The last parameter sets the I2C data transfer rate. // If false the data rate is set to 100kbps and if true the data rate will // be set to 400kbps. I2CMasterInitExpClk(I2C0_BASE, SysCtlClockGet(), false); //clear I2C FIFOs HWREG(I2C0_BASE + I2C_O_FIFOCTL) = 80008000;]I2c发送数据 //sends an I2C command to the specified slavevoid I2CSend(uint8_t slave_addr, uint8_t num_of_args, ...)[ // Tell the master module what address it will place on the bus when // communicating with the slave. I2CMasterSlaveAddrSet(I2C0_BASE, slave_addr, false); //stores list of variable number of arguments va_list vargs; //specifies the va_list to "open" and the last fixed argument //so vargs knows where to start looking va_start(vargs, num_of_args); //put data to be sent into FIFO I2CMasterDataPut(I2C0_BASE, va_arg(vargs, uint32_t)); //if there is only one argument, we only need to use the //single send I2C function if(num_of_args == 1) [ //Initiate send of data from the MCU I2CMasterControl(I2C0_BASE, I2C_MASTER_CMD_SINGLE_SEND); // Wait until MCU is done transferring. while(I2CMasterBusy(I2C0_BASE)); //"close" variable argument list va_end(vargs); ] //otherwise, we start transmission of multiple bytes on the //I2C bus else [ //Initiate send of data from the MCU I2CMasterControl(I2C0_BASE, I2C_MASTER_CMD_BURST_SEND_START); // Wait until MCU is done transferring. while(I2CMasterBusy(I2C0_BASE)); //send num_of_args-2 pieces of data, using the //BURST_SEND_CONT command of the I2C module for(uint8_t i = 1; i < (num_of_args - 1); i++) [ //put next piece of data into I2C FIFO I2CMasterDataPut(I2C0_BASE, va_arg(vargs, uint32_t)); //send next data that was just placed into FIFO I2CMasterControl(I2C0_BASE, I2C_MASTER_CMD_BURST_SEND_CONT); // Wait until MCU is done transferring. while(I2CMasterBusy(I2C0_BASE)); ] //put last piece of data into I2C FIFO I2CMasterDataPut(I2C0_BASE, va_arg(vargs, uint32_t)); //send next data that was just placed into FIFO I2CMasterControl(I2C0_BASE, I2C_MASTER_CMD_BURST_SEND_FINISH); // Wait until MCU is done transferring. while(I2CMasterBusy(I2C0_BASE)); //"close" variable args list va_end(vargs); ]] 0
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答案对人有帮助，有参考价值0 I2C发送字符串数组 //sends an array of data via I2C to the specified slavevoid I2CSendString(uint32_t slave_addr, char array[])[ // Tell the master module what address it will place on the bus when // communicating with the slave. I2CMasterSlaveAddrSet(I2C0_BASE, slave_addr, false); //put data to be sent into FIFO I2CMasterDataPut(I2C0_BASE, array[0]); //if there is only one argument, we only need to use the //single send I2C function if(array[1] == '') [ //Initiate send of data from the MCU I2CMasterControl(I2C0_BASE, I2C_MASTER_CMD_SINGLE_SEND); // Wait until MCU is done transferring. while(I2CMasterBusy(I2C0_BASE)); ] //otherwise, we start transmission of multiple bytes on the //I2C bus else [ //Initiate send of data from the MCU I2CMasterControl(I2C0_BASE, I2C_MASTER_CMD_BURST_SEND_START); // Wait until MCU is done transferring. while(I2CMasterBusy(I2C0_BASE)); //initialize index into array uint8_t i = 1; //send num_of_args-2 pieces of data, using the //BURST_SEND_CONT command of the I2C module while(array[i + 1] != '') [ //put next piece of data into I2C FIFO I2CMasterDataPut(I2C0_BASE, array[i++]); //send next data that was just placed into FIFO I2CMasterControl(I2C0_BASE, I2C_MASTER_CMD_BURST_SEND_CONT); // Wait until MCU is done transferring. while(I2CMasterBusy(I2C0_BASE)); ] //put last piece of data into I2C FIFO I2CMasterDataPut(I2C0_BASE, array ); //send next data that was just placed into FIFO I2CMasterControl(I2C0_BASE, I2C_MASTER_CMD_BURST_SEND_FINISH); // Wait until MCU is done transferring. while(I2CMasterBusy(I2C0_BASE)); ]]I2C接收数据 //read specified register on slave deviceuint32_t I2CReceive(uint32_t slave_addr, uint8_t reg)[ //specify that we are writing (a register address) to the //slave device I2CMasterSlaveAddrSet(I2C0_BASE, slave_addr, false); //specify register to be read I2CMasterDataPut(I2C0_BASE, reg); //send control byte and register address byte to slave device I2CMasterControl(I2C0_BASE, I2C_MASTER_CMD_BURST_SEND_START); //wait for MCU to finish transaction while(I2CMasterBusy(I2C0_BASE)); //specify that we are going to read from slave device I2CMasterSlaveAddrSet(I2C0_BASE, slave_addr, true); //send control byte and read from the register we //specified I2CMasterControl(I2C0_BASE, I2C_MASTER_CMD_SINGLE_RECEIVE); //wait for MCU to finish transaction while(I2CMasterBusy(I2C0_BASE)); //return data pulled from the specified register return I2CMasterDataGet(I2C0_BASE);]

2018-6-11 02:29:54 评论举报韦明