Hello,
I'm working in lin mode with the LM4F232H5QC micro controller. I activate in the init part the sb,edge1,edge5 and rx interrupt like the data sheet request and activate the lin.
My problem is that the edge1 and edge5 i dont get correctly so sometimes he detect edge1 but not edge5 or he detect only sb and not the other. So i cant calculate correctly the frequency.
I add my code. What seems to be the problem?
void
uart2_IntHandler()
{
unsigned long ulStatus;
char newData,Tmp;
int i;
ulStatus = UARTIntStatus(UART2_BASE, true);
//Read Sync Break
if (ulStatus & UART_INT_LIN_SB)
{
Tmp=HWREG(UART2_BASE+UART_O_DR);
o_debug_printf(3,"\n\rSB\n\r");
}
if (ulStatus & UART_INT_LIN_EDGE1)
{
LinTimer1st=HWREG(UART2_BASE+UART_O_LTIM);
}
if (ulStatus & UART_INT_LIN_EDGE5)
{
LinTimer5th=HWREG(UART2_BASE+UART_O_LTIM);
LinFreq=((LinTimer5th-LinTimer1st)/2);
}
}
if (ulStatus & UART_INT_RX)
{
while(UARTCharsAvail(UART2_BASE))
{
newData = UARTCharGetNonBlocking(UART2_BASE);
LinBUARTbuffC[LinBUartBufferCIndex++] = newData;
}
}
UARTIntClear(UART2_BASE, ulStatus);
}
void
init_uart()
{
SysCtlPeripheralEnable(SYSCTL_PERIPH2_UART2);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
GPIOPinConfigure(GPIO_PD6_U2RX);
GPIOPinConfigure(GPIO_PD7_U2TX);
GPIOPinTypeUART(GPIO_PORTD_BASE, GPIO_PIN_6 | GPIO_PIN_7);
UARTConfigSetExpClk(UART2_BASE, SysCtlClockGet(), 10000,
(UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE |
UART_CONFIG_PAR_NONE));
//LIN Mode Enable
HWREG(UART2_BASE+UART_O_CTL) |= (UART_CTL_LIN |UART_CTL_RXE |UART_CTL_UARTEN );
//Define Lin intterupts
UARTIntEnable(UART2_BASE, UART_INT_RX | UART_INT_LIN_SB
| UART_INT_LIN_EDGE1 | UART_INT_LIN_EDGE5);
UARTFlowControlSet(UART2_BASE,UART_FLOWCONTROL_NONE);
UARTFIFOLevelSet(UART2_BASE,UART_FIFO_TX4_8,UART_FIFO_RX1_8);
UARTEnable(UART2_BASE);
IntPrioritySet(INT_UART2,PRIO_LEVEL4);
IntMasterEnable(); //Enable Interrupt
IntEnable(INT_UART2);
}
