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部件号：SW-EK-LM4F120XL 主题中讨论的其他部件：EK-LM4F120XL， TM4C123， EK-TM4C123GXL
我已经设置了一个功能，以便配置LM4F120H5QR微控制器与外部传感器(HMC5883L)之间的I2C通信。
我使用了lm4f120h5qr.h中的寄存器定义
它看起来是否正常？
文件：///C/Users/Peter/Documents/Afgangsprojet/EK-LM4F120XL_Launchpad/lm4f120h5qr.h
void I2C_Config(void)
{
SYSCTL_RCGCI2C_R |= SYSCTL_RCGCI2C_R0; // Set bit 0/R0 in the Inter-Integrated Circuit Run Mode Clock Gating Control (RCGCI2C) register,
//in order to enable and provide a clock to I2C module 0 in Run mode.
SYSCTL_RCGCGPIO_R |= SYSCTL_RCGCGPIO_R1; // Set bit 1/R1 to enable and provide a clock to GPIO Port B in Run mode,
//in the General-Purpose Input/Output Run Mode Clock Gating Control (RCGCGPIO) register.
GPIO_PORTB_AHB_AFSEL_R |= 0xC; // Set PB2 & PB3 to enable the appropriate pins for their alternate function,
//in the GPIO Alternate Function Select (GPIOAFSEL) register.
GPIO_PORTB_AHB_ODR_R |= 0x8; // Set PB3 (I2C0SDA) for open-drain operation,
//in the GPIO Open Drain Select (GPIOODR) register.
GPIO_PORTB_AHB_PCTL_R |= 0x00003300; // Set the bit field PMC0 to 0011 in the GPIO Port Control (GPIOPCTL) register, in order to enable the
//appropriate pins for their alternate function.
I2C0_MASTER_MCR_R = 0x00000010; // Initialize the I2C Master by writing the I2C Master Configuration (I2CMCR) register with a value of 0x0000.0010.
I2C0_MASTER_MTPR_R = 0x00000027; // Set the desired SCL clock speed by writing the I2C Master Timer Period (I2CMTPR) register with the equation:
//TPR = (System Clock/(2*(SCL_LP + SCL_HP)*SCL_CLK))-1
//SCL_LP & SCL_HP are fixed at 6 & 4 respectively, SCL_CLK is the desired clock speed of the I2C clock(100 Kbps, 400 Kbps & 1 Mbps)
//and TPR is the Timer Period register value (range of 1 to 127).
}
