ARM LPC2378 I2C与HMC5883L的接口
我正在尝试将LPC2378I2C0与HMC5883L接口。我编写了以下代码:ARM LPC2378 I2C与HMC5883L的接口,arm,embedded,keil,lpc,Arm,Embedded,Keil,Lpc,我正在尝试将LPC2378I2C0与HMC5883L接口。我编写了以下代码: main () { lcd_init(); lcd_clear(); PINSEL1 |= 0x01400000; I20CONCLR =0x6c; //Clear all flags I20CONSET=0X40; //Enable the interface. I20SCLH=I20SCLL=60; //100 KHz VICIntEnable |=
main () {
lcd_init();
lcd_clear();
PINSEL1 |= 0x01400000;
I20CONCLR =0x6c; //Clear all flags
I20CONSET=0X40; //Enable the interface.
I20SCLH=I20SCLL=60; //100 KHz
VICIntEnable |= 0x0000200;
VICVectPriority9 = 1;
VICVectAddr9 = (unsigned long)ISR_I2C;
I20CONSET=0X60; //to send Start bit
while(1)
{
// Idle state. Waiting for interrupts.
}
}
__irq void ISR_I2C(void) {
int status;
status=I20STAT;
if(status==0X08)
{
I20DAT=0x3C; // Slave address + R/W bit
lcd_print("Hello");
I20CONCLR=0x28; //start, interrupt clear
}
if(status==0X18)
{
I20DAT=0x02; //Slave ACK, Send data byte
lcd_print("ACK");
I20CONCLR=0x08; // interrupt clear
}
if(status==0X20)
{
lcd_print("NACK");
I20CONCLR=0x08; // interrupt clear
}
VICVectAddr = 0;
}
当我在Keil中模拟运行时,我得到了NACK状态,这是预期的,因为没有从机进行确认,但是当我连接到HMC5883L时,在传输SLA+W字节后,我既没有达到ACK状态,也没有达到NACK状态。此问题的原因可能是什么?您知道问题是出在i2C驱动程序还是通过i2C发送的数据上吗?如果你能将其分离出来,它将有助于解决你的问题。此外,如果你既没有收到ACK也没有收到NACK,让它打印出I20STAT寄存器的值,并在数据表中查找该值,以了解该值的含义。在调试器中一步一步地运行这个程序将帮助您监视所有这些寄存器。抱歉,除了这个建议之外,我并没有足够的LPC2378经验来提供帮助