TMS320F280039C: F280039

Yan JIANG

Part Number: TMS320F280039C

关于IIC读取：

IIC配置如下：

GPIO_setPinConfig(GPIO_26_I2CA_SDA); // SDA, I2C-A Open-Drain Bidirectional Data
GPIO_setPadConfig(26, GPIO_PIN_TYPE_PULLUP);
GPIO_setQualificationMode(26, GPIO_QUAL_ASYNC);

GPIO_setPinConfig(GPIO_27_I2CA_SCL); // SCL, I2C-A Open-Drain Bidirectional Clock
GPIO_setPadConfig(27, GPIO_PIN_TYPE_PULLUP);
GPIO_setQualificationMode(27, GPIO_QUAL_ASYNC);

// Initialize I2C
//I2caRegs.I2CMDR.bit.IRS = 0;
I2caRegs.I2CSAR.bit.SAR = 0x50; // Set slave address
I2caRegs.I2CMDR.bit.MST = 1; // Select master or slave mode
I2caRegs.I2CMDR.bit.DLB = 0; // Enable digital loopback bit
//I2caRegs.I2CPSC.all = 10; // Prescaler - need 7-12 Mhz on module clk
I2caRegs.I2CPSC.all = 11;
//I2caRegs.I2CCLKL = 10; // NOTE: must be non zero
//I2caRegs.I2CCLKH = 5; // NOTE: must be non zero
I2caRegs.I2CCLKL = 35; // NOTE: must be non zero
I2caRegs.I2CCLKH = 35; // NOTE: must be non zero

//I2caRegs.I2CFFTX.bit.TXFFIL = 16; // Set fifo interrupt level
//I2caRegs.I2CFFRX.bit.RXFFIENA = 1; // Enable Rx Fifo interrupt
//I2caRegs.I2CFFRX.bit.RXFFIL = 16; // Set fifo interrupt level
//I2caRegs.I2CFFRX.bit.RXFFINTCLR = 1; // Clear Rx interrupt flag

I2caRegs.I2CIER.all = 0x24; // Enable SCD & ARDY interrupts

I2caRegs.I2CFFTX.all = 0x6000; // Enable TxFIFO mode
I2caRegs.I2CFFRX.all = 0x2000; // Enable RxFIFO mode

//I2caRegs.I2CSTR.bit.AAS =1;
I2caRegs.I2CMDR.bit.IRS = 1; // Take I2C out of reset

读取底层驱动如下：

Uint16 uwWriteOrder;
static Uint16 uwWaitCnt = 0;
static Uint16 uwWaitCnt1 = 0;
static Uint16 uwWaitCnt2 = 0;
static Uint16 uwWaitCnt3 = 0;
static Uint16 uwWaitCnt4 = 0;

if(I2caRegs.I2CMDR.bit.STP == 1)
{
DEVICE_DELAY_US(80);
if(++uwWaitCnt1 > 250)
{
uwWaitCnt1 = 250;
return(2);
}
else return(0);
}
else
{
uwWaitCnt1 = 0;
}

uwWriteOrder = 0x50;
I2caRegs.I2CSAR.bit.SAR = uwWriteOrder;

if(I2caRegs.I2CSTR.bit.BB == 1) // Check if bus busy
{
DEVICE_DELAY_US(80);
if(++uwWaitCnt2 > 250)
{
uwWaitCnt2 = 250;
return(2);
}
else return(0);
}
else
{
uwWaitCnt2 = 0;
}

I2caRegs.I2CCNT = 2; // Set data length
I2caRegs.I2CDXR.bit.DATA = (10>>8);
I2caRegs.I2CDXR.bit.DATA = (10&0xff);

I2caRegs.I2CMDR.all = 0x6620;

上面配置完 EEPROM 芯片地址0x50；发送长度，以及相关寄存器后，

while(I2caRegs.I2CISRC.all != 0x3)
{
DEVICE_DELAY_US(80); //20
if(++uwWaitCnt > 10)
{
uwWaitCnt = 10;
return(2);
}
}

I2caRegs.I2CCNT = 2; // Set data length
I2caRegs.I2CMDR.all = 0x6C20;

系统会一直卡在while(I2caRegs.I2CISRC.all != 0x3) 这里，直到大于delay时间80us，跳出此函数。此时读取SCL和SDA波形，已经发出开始信号，SDA信号在SCL为高时被拉低，紧接着SCL被拉低。但是系统没有将EEPROM芯片的物理地址0x50传送出去。

I2caRegs.I2CISRC.all != 0x3 ，Registers ready to be accessed ：无法读取IIC寄存器？是因为I2caRegs.I2CIER.ARDY 中断没有触发嘛？

请帮忙分析一下是否有哪里未配置合理，谢谢。

2 年多前