TIVA TM4C129 的I2C读取问题

yanmei zou

IIC的初始化如下

Myi2cMaster_Init( I2C0_BASE, GPIO_PORTB_BASE, 100000 );

void Myi2cMaster_Init(uint32_t ui32Base, uint32_t PortBase, 
						uint32_t ui32SCLFreq)
{
    ASSERT(_I2CBaseValid(ui32Base));
	uint32_t SCLGPIO_Pin, SDAGPIO_Pin, SCLPinConfig, SDAPinConfig;
	switch( ui32Base )
	{
		case I2C0_BASE:		
			SCLPinConfig		= GPIO_PB2_I2C0SCL;
			SDAPinConfig		= GPIO_PB3_I2C0SDA;
			SCLGPIO_Pin			= GPIO_PIN_2;
			SDAGPIO_Pin			= GPIO_PIN_3;
			SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C0);
			SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);
			break;
		case I2C1_BASE:		
			SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C1);
			if( PortBase == GPIO_PORTG_BASE )
			{
				SCLPinConfig		= GPIO_PG0_I2C1SCL;
				SDAPinConfig		= GPIO_PG1_I2C1SDA;
				SCLGPIO_Pin			= GPIO_PIN_0;
				SDAGPIO_Pin			= GPIO_PIN_1;
				SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOG);
			}
			else
			{
				SCLPinConfig		= GPIO_PR0_I2C1SCL;
				SDAPinConfig		= GPIO_PR1_I2C1SDA;
				SCLGPIO_Pin			= GPIO_PIN_0;
				SDAGPIO_Pin			= GPIO_PIN_1;
				SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOR);
			}
				break;
		case I2C2_BASE:
			SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C2);
			SCLPinConfig		= GPIO_PG2_I2C2SCL;
			SDAPinConfig		= GPIO_PG3_I2C2SDA;
			SCLGPIO_Pin			= GPIO_PIN_2;
			SDAGPIO_Pin			= GPIO_PIN_3;
			SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOG);
			break;
		case I2C3_BASE:		
			SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C3);
			if( PortBase == GPIO_PORTG_BASE )
			{
				SCLPinConfig		= GPIO_PG4_I2C3SCL;
				SDAPinConfig		= GPIO_PG5_I2C3SDA;
				SCLGPIO_Pin			= GPIO_PIN_4;
				SDAGPIO_Pin			= GPIO_PIN_5;
				SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOG);
			}
			else
			{
				SCLPinConfig		= GPIO_PR4_I2C3SCL;
				SDAPinConfig		= GPIO_PR5_I2C3SDA;
				SCLGPIO_Pin			= GPIO_PIN_4;
				SDAGPIO_Pin			= GPIO_PIN_5;
				SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOR);
			}
			break;
		case I2C4_BASE:
			SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C4);
			SCLPinConfig		= GPIO_PG6_I2C4SCL;
			SDAPinConfig		= GPIO_PG7_I2C4SDA;
			SCLGPIO_Pin			= GPIO_PIN_6;
			SDAGPIO_Pin			= GPIO_PIN_7;
			SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOG);
			break;
		case I2C5_BASE:
			SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C5);
			SCLPinConfig		= GPIO_PB0_I2C5SCL;
			SDAPinConfig		= GPIO_PB1_I2C5SDA;
			SCLGPIO_Pin			= GPIO_PIN_0;
			SDAGPIO_Pin			= GPIO_PIN_1;
			SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);
			break;
	}
	
	GPIOPinConfigure( SCLPinConfig );
	GPIOPinConfigure( SDAPinConfig );
	GPIOPinTypeI2CSCL( PortBase, SCLGPIO_Pin );
	GPIOPinTypeI2C( PortBase, SDAGPIO_Pin );
	
	I2CMasterPrivateInit( ui32Base, ui32SysClock, ui32SCLFreq);
	I2CMasterEnable( ui32Base );
}

读取程序如下：

I2CMasterSlaveAddrSet( I2C0_BASE, 0x50, 0);	
		I2CMasterDataPut( I2C0_BASE, 0x01 );

while( I2CMasterErr(I2C0_BASE) | I2CMasterBusy(I2C0_BASE) );
		I2CMasterControl( I2C0_BASE, I2C_MASTER_CMD_BURST_SEND_START );				
		I2CMasterDataPut( I2C0_BASE, 0x06  );//write data									SysCtlDelay( 5 );
		while( I2CMasterErr(I2C0_BASE) | I2CMasterBusy(I2C0_BASE) );
		I2CMasterControl( I2C0_BASE, I2C_MASTER_CMD_BURST_SEND_FINISH );					//主机数据+stop传输
		while( I2CMasterErr(I2C0_BASE) | I2CMasterBusy(I2C0_BASE) );

程序移植停在了些寄存器地址后的While语句中了。为什么会这样呢？

10 年多前

0 xyz549040622 10 年多前

Guru 65885 points

你初始化的是I2C6，读取的是I2C0，不出问题才怪了。

0 yanmei zou 10 年多前回复 xyz549040622

Prodigy 30 points

初始化是另写的程序

0 xyz549040622 10 年多前回复 yanmei zou

Guru 65885 points

原来这样，我说么，这么低级的错误。

0 xyz549040622 10 年多前回复 yanmei zou

Guru 65885 points

IntEnable(INT_I2C0);

//
// Configure and turn on the I2C0 slave interrupt. The I2CSlaveIntEnableEx()
// gives you the ability to only enable specific interrupts. For this case
// we are only interrupting when the slave device receives data.
//
I2CSlaveIntEnableEx(I2C0_BASE, I2C_SLAVE_INT_DATA);

//
// 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. For this example we will use a data rate of 100kbps.
//
I2CMasterInitExpClk(I2C0_BASE, SysCtlClockGet(), false);

//
// Enable the I2C0 slave module.
//
I2CSlaveEnable(I2C0_BASE);

//
// Set the slave address to SLAVE_ADDRESS. In loopback mode, it's an
// arbitrary 7-bit number (set in a macro above) that is sent to the
// I2CMasterSlaveAddrSet function.
//
I2CSlaveInit(I2C0_BASE, SLAVE_ADDRESS);

//
// Tell the master module what address it will place on the bus when
// communicating with the slave. Set the address to SLAVE_ADDRESS
// (as set in the slave module). The receive parameter is set to false
// which indicates the I2C Master is initiating a writes to the slave. If
// true, that would indicate that the I2C Master is initiating reads from
// the slave.
//
I2CMasterSlaveAddrSet(I2C0_BASE, SLAVE_ADDRESS, false);

//
// Set up the serial console to use for displaying messages. This is just
// for this example program and is not needed for proper I2C operation.
//
InitConsole();

//
// Enable interrupts to the processor.
//
IntMasterEnable();

官方给的例程的初始化顺序如下，TIVA对时序有些严格，或许存在你有的参数没写进去的情况。要么按照官方的顺序来，参考官方的例程，要么看看哪个寄存器没配置好吧。

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TIVA TM4C129 的I2C读取问题