//Initialize as a master
void TwoWire::begin(void)
{
if(i2cModule == NOT_ACTIVE) {
i2cModule = BOOST_PACK_WIRE;
}
ROM_SysCtlPeripheralEnable(g_uli2cPeriph[i2cModule]);
//Configure GPIO pins for I2C operation
ROM_GPIOPinConfigure(g_uli2cConfig[i2cModule][0]);
ROM_GPIOPinConfigure(g_uli2cConfig[i2cModule][1]);
ROM_GPIOPinTypeI2C(g_uli2cBase[i2cModule], g_uli2cSDAPins[i2cModule]);
ROM_GPIOPinTypeI2CSCL(g_uli2cBase[i2cModule], g_uli2cSCLPins[i2cModule]);
ROM_I2CMasterInitExpClk(MASTER_BASE, F_CPU, speedMode);//Bus speed
if(speedMode==I2C_SPEED_FASTMODE_PLUS)//Force 1Mhz
{
uint32_t ui32TPR = ((F_CPU + (2 * 10 * 1000000l) - 1) / (2 * 10 * 1000000l)) - 1;
HWREG(MASTER_BASE + I2C_O_MTPR) = ui32TPR;
}
//force a stop condition
if(!ROM_GPIOPinRead(g_uli2cBase[i2cModule], g_uli2cSCLPins[i2cModule]))
forceStop();
//Handle any startup issues by pulsing SCL
if(ROM_I2CMasterBusBusy(MASTER_BASE) || ROM_I2CMasterErr(MASTER_BASE)
|| !ROM_GPIOPinRead(g_uli2cBase[i2cModule], g_uli2cSCLPins[i2cModule])) {
uint8_t doI = 0;
ROM_GPIOPinTypeGPIOOutput(g_uli2cBase[i2cModule], g_uli2cSCLPins[i2cModule]);
unsigned long mask = 0;
do {
for(unsigned long i = 0; i < 10 ; i++) {
if(speedMode==I2C_SPEED_FASTMODE_PLUS)
ROM_SysCtlDelay(F_CPU/1000000/3);//1000Hz=desired frequency, delay iteration=3 cycles
else if(speedMode==I2C_SPEED_FASTMODE)
ROM_SysCtlDelay(F_CPU/400000/3);//400Hz=desired frequency, delay iteration=3 cycles
else
ROM_SysCtlDelay(F_CPU/100000/3);//100Hz=desired frequency, delay iteration=3 cycles
mask = (i%2) ? g_uli2cSCLPins[i2cModule] : 0;
ROM_GPIOPinWrite(g_uli2cBase[i2cModule], g_uli2cSCLPins[i2cModule], mask);
}
doI++;
} while(ROM_I2CMasterBusBusy(MASTER_BASE) && doI < 100);
ROM_GPIOPinTypeI2CSCL(g_uli2cBase[i2cModule], g_uli2cSCLPins[i2cModule]);
if(!ROM_GPIOPinRead(g_uli2cBase[i2cModule], g_uli2cSCLPins[i2cModule]))
forceStop();
}
}
//Initialize as a slave
void TwoWire::begin(uint8_t address)
{
if(i2cModule == NOT_ACTIVE) {
i2cModule = BOOST_PACK_WIRE;
}
ROM_SysCtlPeripheralEnable(g_uli2cPeriph[i2cModule]);
ROM_GPIOPinConfigure(g_uli2cConfig[i2cModule][0]);
ROM_GPIOPinConfigure(g_uli2cConfig[i2cModule][1]);
ROM_GPIOPinTypeI2C(g_uli2cBase[i2cModule], g_uli2cSDAPins[i2cModule]);
ROM_GPIOPinTypeI2CSCL(g_uli2cBase[i2cModule], g_uli2cSCLPins[i2cModule]);
slaveAddress = address;
//Enable slave interrupts
ROM_IntEnable(g_uli2cInt[i2cModule]);
I2CSlaveIntEnableEx(SLAVE_BASE, I2C_SLAVE_INT_DATA | I2C_SLAVE_INT_STOP);
HWREG(SLAVE_BASE + I2C_O_SICR) =
I2C_SICR_DATAIC | I2C_SICR_STARTIC | I2C_SICR_STOPIC;
//Setup as a slave device
ROM_I2CMasterDisable(MASTER_BASE);
I2CSlaveEnable(SLAVE_BASE);
I2CSlaveInit(SLAVE_BASE, address);
ROM_IntMasterEnable();
}
void TwoWire::forceStop(void) {
//force a stop to release the bus
ROM_GPIOPinTypeGPIOOutput(g_uli2cBase[i2cModule],
g_uli2cSCLPins[i2cModule] | g_uli2cSDAPins[i2cModule]);
ROM_GPIOPinWrite(g_uli2cBase[i2cModule], g_uli2cSDAPins[i2cModule], 0);
ROM_GPIOPinWrite(g_uli2cBase[i2cModule],
g_uli2cSCLPins[i2cModule], g_uli2cSCLPins[i2cModule]);
ROM_GPIOPinWrite(g_uli2cBase[i2cModule],
g_uli2cSDAPins[i2cModule], g_uli2cSDAPins[i2cModule]);
ROM_GPIOPinTypeI2C(g_uli2cBase[i2cModule], g_uli2cSDAPins[i2cModule]);
ROM_GPIOPinTypeI2CSCL(g_uli2cBase[i2cModule], g_uli2cSCLPins[i2cModule]);
//reset I2C controller
//without resetting the I2C controller, the I2C module will
//bring the bus back to it's erroneous state
ROM_SysCtlPeripheralReset(g_uli2cPeriph[i2cModule]);
while(!ROM_SysCtlPeripheralReady(g_uli2cPeriph[i2cModule]));
ROM_I2CMasterInitExpClk(MASTER_BASE, F_CPU, speedMode);//Bus speed
if(speedMode==I2C_SPEED_FASTMODE_PLUS)//Force 1Mhz
{
uint32_t ui32TPR = ((F_CPU + (2 * 10 * 1000000l) - 1) / (2 * 10 * 1000000l)) - 1;
HWREG(MASTER_BASE + I2C_O_MTPR) = ui32TPR;
}
}
//Initialize as a master
void TwoWire::begin(void)
{
pinMode(RED_LED, OUTPUT);
if(i2cModule == NOT_ACTIVE) {
i2cModule = BOOST_PACK_WIRE;
}
ROM_SysCtlPeripheralEnable(g_uli2cPeriph[i2cModule]);
//Configure GPIO pins for I2C operation
ROM_GPIOPinConfigure(g_uli2cConfig[i2cModule][0]);
ROM_GPIOPinConfigure(g_uli2cConfig[i2cModule][1]);
ROM_GPIOPinTypeI2C(g_uli2cBase[i2cModule], g_uli2cSDAPins[i2cModule]);
ROM_GPIOPinTypeI2CSCL(g_uli2cBase[i2cModule], g_uli2cSCLPins[i2cModule]);
ROM_I2CMasterInitExpClk(MASTER_BASE, F_CPU, false);//max bus speed=400kHz for gyroscope
//force a stop condition
if(!ROM_GPIOPinRead(g_uli2cBase[i2cModule], g_uli2cSCLPins[i2cModule]))
forceStop();
//Handle any startup issues by pulsing SCL
if(ROM_I2CMasterBusBusy(MASTER_BASE) || ROM_I2CMasterErr(MASTER_BASE)
|| !ROM_GPIOPinRead(g_uli2cBase[i2cModule], g_uli2cSCLPins[i2cModule])){
uint8_t doI = 0;
ROM_GPIOPinTypeGPIOOutput(g_uli2cBase[i2cModule], g_uli2cSCLPins[i2cModule]);
unsigned long mask = 0;
do{
for(unsigned long i = 0; i < 10 ; i++) {
ROM_SysCtlDelay(F_CPU/100000/3);//100Hz=desired frequency, delay iteration=3 cycles
mask = (i%2) ? g_uli2cSCLPins[i2cModule] : 0;
ROM_GPIOPinWrite(g_uli2cBase[i2cModule], g_uli2cSCLPins[i2cModule], mask);
}
doI++;
}while(ROM_I2CMasterBusBusy(MASTER_BASE) && doI < 100);
ROM_GPIOPinTypeI2CSCL(g_uli2cBase[i2cModule], g_uli2cSCLPins[i2cModule]);
if(!ROM_GPIOPinRead(g_uli2cBase[i2cModule], g_uli2cSCLPins[i2cModule]))
forceStop();
}
}
void ConfigureI2C3(void){
// Enable peripherals used by I2C
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C3);
// Setup GPIO
ROM_GPIOPinTypeI2CSCL(GPIO_PORTD_BASE, GPIO_PIN_0);
ROM_GPIOPinTypeI2C(GPIO_PORTD_BASE, GPIO_PIN_1);
// Set GPIO D0 and D1 as SCL and SDA
ROM_GPIOPinConfigure(GPIO_PD0_I2C3SCL);
ROM_GPIOPinConfigure(GPIO_PD1_I2C3SDA);
// Initialize as master - 'true' for fastmode, 'false' for regular
ROM_I2CMasterInitExpClk(I2C3_BASE, ROM_SysCtlClockGet(), true);
}
void TwoWire::forceStop(void) {
//force a stop to release the bus
ROM_GPIOPinTypeGPIOOutput(g_uli2cBase[i2cModule],
g_uli2cSCLPins[i2cModule] | g_uli2cSDAPins[i2cModule]);
ROM_GPIOPinWrite(g_uli2cBase[i2cModule], g_uli2cSDAPins[i2cModule], 0);
ROM_GPIOPinWrite(g_uli2cBase[i2cModule],
g_uli2cSCLPins[i2cModule], g_uli2cSCLPins[i2cModule]);
ROM_GPIOPinWrite(g_uli2cBase[i2cModule],
g_uli2cSDAPins[i2cModule], g_uli2cSDAPins[i2cModule]);
ROM_GPIOPinTypeI2C(g_uli2cBase[i2cModule], g_uli2cSDAPins[i2cModule]);
ROM_GPIOPinTypeI2CSCL(g_uli2cBase[i2cModule], g_uli2cSCLPins[i2cModule]);
//reset I2C controller
//without resetting the I2C controller, the I2C module will
//bring the bus back to it's erroneous state
ROM_SysCtlPeripheralReset(g_uli2cPeriph[i2cModule]);
while(!ROM_SysCtlPeripheralReady(g_uli2cPeriph[i2cModule]));
ROM_I2CMasterInitExpClk(MASTER_BASE, F_CPU, false);
}
void tm4c123_i2c_initialize(void)
{
uint32_t count;
tm4c123_i2c_device.state = I2C_STATE_IDLE;
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C3);
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
/* Disable I2C3 */
I2C3->MCR = I2C_MCR_MFE;
ROM_GPIOPinTypeGPIOOutputOD(GPIOD_BASE, GPIO_PIN_0);
ROM_GPIOPinTypeGPIOInput(GPIOD_BASE, GPIO_PIN_1);
/* Delay for 10usec */
armv7m_udelay(10);
/* If SDA is tied low by a slave, issue clock pulses till it releases
* the bus.
*/
for (count = 0; count < 128; count++)
{
if (GPIOD->DATA & GPIO_PIN_1)
{
break;
}
/* Set SCL to L */
armv7m_bitband_peripheral_write(&GPIOD->DATA, 0, 0);
armv7m_udelay(5);
/* Set SCL to H */
armv7m_bitband_peripheral_write(&GPIOD->DATA, 0, 1);
armv7m_udelay(5);
}
ROM_GPIOPinTypeGPIOOutput(GPIOD_BASE, GPIO_PIN_1);
armv7m_bitband_peripheral_write(&GPIOD->DATA, 0, 1);
armv7m_bitband_peripheral_write(&GPIOD->DATA, 1, 1);
armv7m_udelay(5);
/* Now SCL is H and SDA is H, so generate a STOP condition.
*/
/* Set SCL to L */
armv7m_bitband_peripheral_write(&GPIOD->DATA, 0, 0);
armv7m_udelay(5);
/* Set SDA to L */
armv7m_bitband_peripheral_write(&GPIOD->DATA, 1, 0);
armv7m_udelay(5);
/* Set SCL to H */
armv7m_bitband_peripheral_write(&GPIOD->DATA, 0, 1);
armv7m_udelay(5);
/* Set SDA to H */
armv7m_bitband_peripheral_write(&GPIOD->DATA, 1, 1);
armv7m_udelay(5);
/* After this recovery, switch to regular I2C mode.
*/
/* Enable pin PD0 for I2C3 I2C3SCL
*/
ROM_GPIOPinConfigure(GPIO_PD0_I2C3SCL);
ROM_GPIOPinTypeI2CSCL(GPIOD_BASE, GPIO_PIN_0);
/* Enable pin PD1 for I2C3 I2C3SDA
*/
ROM_GPIOPinConfigure(GPIO_PD1_I2C3SDA);
ROM_GPIOPinTypeI2C(GPIOD_BASE, GPIO_PIN_1);
tm4c123_i2c_reset();
NVIC_SetPriority(I2C3_IRQn, 3);
NVIC_EnableIRQ(I2C3_IRQn);
}
//*****************************************************************************
//
// Main 'C' Language entry point.
//
//*****************************************************************************
int
main(void)
{
const uint8_t bufLength=10;
char inputBuf[1];
//
// Configure the system frequency.
//
g_ui32SysClock = MAP_SysCtlClockFreqSet((SYSCTL_XTAL_25MHZ |
SYSCTL_OSC_MAIN | SYSCTL_USE_PLL |
SYSCTL_CFG_VCO_480), 120000000);
//
// Configure the device pins for this board.
//
PinoutSet(false, false);
//
// Initialize the UART.
//
ConfigureUART();
//
// Print the welcome message to the terminal.
//
UARTprintf("\033[2J\033[H");
UARTprintf("SHT21 Example\n");
//
// The I2C7 peripheral must be enabled before use.
//
// Note: For BoosterPack 2 interface use I2C8.
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C8);
//ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
//
// Configure the pin muxing for I2C7 functions on port D0 and D1.
// This step is not necessary if your part does not support pin muxing.
//
// Note: For BoosterPack 2 interface use PA2 and PA3.
//
ROM_GPIOPinConfigure(GPIO_PA2_I2C8SCL);
ROM_GPIOPinConfigure(GPIO_PA3_I2C8SDA);
//
// Select the I2C function for these pins. This function will also
// configure the GPIO pins pins for I2C operation, setting them to
// open-drain operation with weak pull-ups. Consult the data sheet
// to see which functions are allocated per pin.
//
// Note: For BoosterPack 2 interface use PA2 and PA3.
//
ROM_GPIOPinTypeI2CSCL(GPIO_PORTA_BASE, GPIO_PIN_2);
ROM_GPIOPinTypeI2C(GPIO_PORTA_BASE, GPIO_PIN_3);
//
// Keep only some parts of the systems running while in sleep mode.
// GPIOE is for the ISL29023 interrupt pin.
// UART0 is the virtual serial port.
// I2C7 is the I2C interface to the ISL29023.
//
// Note: For BoosterPack 2 change this to I2C8.
//
ROM_SysCtlPeripheralClockGating(true);
ROM_SysCtlPeripheralSleepEnable(SYSCTL_PERIPH_GPIOE);
ROM_SysCtlPeripheralSleepEnable(SYSCTL_PERIPH_UART0);
ROM_SysCtlPeripheralSleepEnable(SYSCTL_PERIPH_I2C8);
//
// Enable interrupts to the processor.
//
ROM_IntMasterEnable();
//
// Initialize I2C7 peripheral.
//
// Note: For BoosterPack 2 use I2C8.
//
I2CMInit(&g_sI2CInst, I2C8_BASE, INT_I2C8, 0xff, 0xff, g_ui32SysClock);
//
// Turn on D2 to show we are starting an I2C transaction with the sensor.
// This is turned off in the application callback.
//
LEDWrite(CLP_D1 | CLP_D2 , CLP_D2);
//
// Initialize the SHT21.
//
SHT21Init(&g_sSHT21Inst, &g_sI2CInst, SHT21_I2C_ADDRESS,
SHT21AppCallback, &g_sSHT21Inst);
//
// Initialize the TMP006
//
TMP006Init(&g_sTMP006Inst, &g_sI2CInst, TMP006_I2C_ADDRESS,
TMP006AppCallback, &g_sTMP006Inst);
//
// Wait for the I2C transactions to complete before moving forward.
//
SHT21AppI2CWait(__FILE__, __LINE__);
//
// Delay for 20 milliseconds for SHT21 reset to complete itself.
// Datasheet says reset can take as long 15 milliseconds.
//
ROM_SysCtlDelay(g_ui32SysClock / (50 * 3));
UARTprintf("Menu:\n");
UARTprintf("h for Humidity \n");
UARTprintf("t for Temperature \n");
//
// Loop Forever.
//
while(1)
{
if(UARTgets(inputBuf,bufLength)){
if(inputBuf[0]=='h'){
UARTprintf("Sensing Humidity Data:\n");
printHumidityData();
}
else if(inputBuf[0]=='t'){
UARTprintf("Sensing Temperature Data:\n");
printTemperatureData();
}
}
}
}
void MPU6050_Init(void){
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C0);
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);
ROM_SysCtlDelay(3);
ROM_GPIOPinConfigure(GPIO_PB2_I2C0SCL);
ROM_GPIOPinConfigure(GPIO_PB3_I2C0SDA);
ROM_GPIOPinTypeI2CSCL(GPIO_PORTB_BASE, GPIO_PIN_2);
ROM_GPIOPinTypeI2C(GPIO_PORTB_BASE, GPIO_PIN_3);
//ROM_GPIOPinTypeGPIOInput(GPIO_PORTB_BASE, GPIO_PIN_0);
//GPIOIntEnable(GPIO_PORTB_BASE, GPIO_PIN_0);
//ROM_GPIOIntTypeSet(GPIO_PORTB_BASE, GPIO_PIN_0, GPIO_FALLING_EDGE);
//ROM_IntEnable(INT_GPIOB);
ROM_I2CMasterEnable(I2C0_BASE);
I2CMInit(&sI2CInst, I2C0_BASE, INT_I2C0, 0xff, 0xff, ROM_SysCtlClockGet());
g_bMPU6050Done = false;
MPU6050Init(&sMPU6050, &sI2CInst, 0x68, MPU6050_Callback, 0);
while(!g_bMPU6050Done);
g_bMPU6050Done = false;
MPU6050ReadModifyWrite(&sMPU6050, MPU6050_O_PWR_MGMT_1,
~MPU6050_PWR_MGMT_1_SLEEP,
0, MPU6050_Callback,
0);//从Sleep模式中激活设备，否则无法写入寄存器
while(!g_bMPU6050Done);
// Configure the MPU6050 for +/- 4 g accelerometer range.
//
g_bMPU6050Done = false;
//先读取寄存器的值，再与上Mask，然后再或上Value，将得到的值写入寄存器
MPU6050ReadModifyWrite(&sMPU6050, MPU6050_O_PWR_MGMT_1,
~MPU6050_PWR_MGMT_1_CLKSEL_M,
MPU6050_PWR_MGMT_1_CLKSEL_XG, MPU6050_Callback,
0);
while(!g_bMPU6050Done);
g_bMPU6050Done = false;
MPU6050ReadModifyWrite(&sMPU6050, MPU6050_O_ACCEL_CONFIG,
~MPU6050_ACCEL_CONFIG_AFS_SEL_M,
MPU6050_ACCEL_CONFIG_AFS_SEL_4G, MPU6050_Callback,
0);
while(!g_bMPU6050Done);
g_bMPU6050Done = false;
MPU6050ReadModifyWrite(&sMPU6050, MPU6050_O_CONFIG,
~MPU6050_CONFIG_DLPF_CFG_M,
MPU6050_CONFIG_DLPF_CFG_44_42, MPU6050_Callback,
0);
while(!g_bMPU6050Done);
g_bMPU6050Done = false;
MPU6050ReadModifyWrite(&sMPU6050, MPU6050_O_GYRO_CONFIG,
~MPU6050_GYRO_CONFIG_FS_SEL_M,
MPU6050_GYRO_CONFIG_FS_SEL_2000, MPU6050_Callback,
0);
while(!g_bMPU6050Done);
MPU6050Read(&sMPU6050,MPU6050_O_WHO_AM_I,&deviceID,1,MPU6050_Callback,0);//MPU-60X0设备号默认0x68
ROM_SysCtlDelay(ROM_SysCtlClockGet()/(3*1000));
MPU6050Read(&sMPU6050,MPU6050_O_PWR_MGMT_1,&PowerInfo,1,MPU6050_Callback,0);//若读到的值是0x00，则设备处于激活状态。0x40则为休眠状态
}