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I'm trying to setup SCI1 as a communications port (using the DSP56f807 EVM), but am running into difficulty with it. I have already setup SCI0 and verified it to be working so I know that i'm on the right track for sampling data. I have initialized both ports the same way, 9600 baud, 8 bits, no parity. Also, i have made sure bits 6-7 on GPIO_D_PER are 1, as they're shared between I/O and SCI1. Does anyone know if there is something else on the EVM that could cause problems with SCI port 1? Any help would be greatly appreciated. Below is the initialization, and ISR code for SCI1...(mind you, this exact setup works for SCI0, which is what leads me to believe that the EVM has something to do with it)... thanks again. -------------------------- (this is in a DSP_init() routine in main.c) /* Allow SCI to control bits 6-7 of GPIO_D */ GPIO_D_PER = (D6 | D7); GPIO_D_DDR = ( D0 | D1 | D2 | D3 | D4 | D5 | D6 ); -------------------------- (the following is in a separate sci module) PUBLIC void asci_init( void ) { uint8 dummy_read; /* * Keep Interrupts OFF while setting pointers & counters * (this prevents race conditions) */ inptr = in_buffer; *inptr = NEWLINE; /* end-of-input for SCI task */ outptr = out_tailptr = out_buffer; /* clear output pointers */ out_char_cnt = 0; /* * The UART is double-buffered, so we need to perform two * dummy reads to insure that the receiver is cleared */ dummy_read = SCI1_SCISR; dummy_read = SCI1_SCIDR; dummy_read = SCI1_SCISR; dummy_read = SCI1_SCIDR; /* * configure an interrupt priority level for SCI receive interrupts * (Note: diagnostic SCI interrupts are VERY LOW priority) */ hdw_set_PLR( SCI_1_RX_FULL_VECTOR, CH1 ); /* * initialize diagnostic port attributes and operating mode */ hdw_sci_clr_PE( SCI1 ); hdw_sci_clr_M( SCI1 ); sci_set_admin_baud( baud_9600 ); SCI1_SCICR = ( RIE | TE | RE); // RX IRQs + RX & TX enable } -------------------------- (here is the ISR for SCI1) ISR void admin_sci_isr( void ) { char c; status = SCI1_SCISR; // capture status and SCI1_SCISR = 0; // clear any pending errors // // if a character has been received, store it // otherwise substitute a NUL // if (status & RDRF) { input_char = SCI1_SCIDR; input_char &= 0xFF; } if ((status & OR) || (status & NF) || (status & FE)) { input_char = NUL; } } |
807 SCI1/GPIOD problems
Started by ●May 7, 2003
