I am having an issue recieving characters from a serial device. The device sends characters without any idle time in between bytes. For example, the device is supposed to respond with "OK<CR>" (3 byte response) upon receiving a specific command.
I only recieve the first character and overrun on the 2nd. I have tried polled mode and interrupts without any success. I have also cranked up the processor speed to 40MHz.
For interrupt mode, i initialize the peripheral as follows...
/* configure SCI2 interrupt mode */
/* SCI2C1: LOOPS=0,SCISWAI=0,Rsrc=0,M=0,WAKE=0,ILT=0,PE=0,PT=0 */
SCI2C1 = 0x00; /* Configure the SCI */
/* SCI2C3: R8=0,T8=0,TXDIR=0,TXINV=0,ORIE=0,NEIE=0,FEIE=0,PEIE=0 */
SCI2C3 = 0x00; /* Disable error interrupts */
/* SCI2S2: LBKDIF=0,RXEDGIF=0,??=0,RXINV=0,RWUID=0,BRK13=0,LBKDE=0,RAF=0 */
SCI2S2 = 0x00;
/* SCI2C2: TIE=0,TCIE=0,RIE=0,ILIE=0,TE=0,RE=0,RWU=0,SBK=0 */
SCI2C2 = 0x00; /* Disable all interrupts */
SCI2BD = UART_BAUD_9600;
/* SCI2C3: ORIE=0,NEIE=0,FEIE=0,PEIE=0 */
SCI2C3 |= 0x00; /* disable error interrupts */
SCI2C2 |= ( SCI2C2_TE_MASK | SCI2C2_RE_MASK | SCI2C2_RIE_MASK); /* Enable transmitter, Enable receiver, Enable receiver interrupt */
asm CLI;
My isr looks like...
void vSci2Rx(void){
char cDummy;
//clear the isr source
cDummy = SCI2S1;//dummy read to clear
//read the char into buf
ucRcvBuf[i++] = SCI2D;
//check for overrun
if(SCI2S1_OR){
cDummy = SCI2D;
}
}
Any ideas on how to improve thru-put w/ this peripheral?
regards
rich
