Hi,
I am using TMS320DM6437 EVM for my project application, and I have some problems about UART0 interrupt.
Would you give me some suggestions?
I create a project to receive data from UART0 using interrupt, and make UART0 to worke in interrupt mode using DSP/BIOS. The settings are as follows:
...
bios.TSK.create("TSK_LedBlink");
bios.TSK.instance("TSK_LedBlink").order = 1;
bios.TSK.instance("TSK_LedBlink").comment = "Led Blink";
bios.TSK.instance("TSK_LedBlink").fxn = prog.extern("LedBlink");
bios.HWI.instance("HWI_INT5").fxn = prog.extern("UART0_ISR");
bios.HWI.instance("HWI_INT5").interruptSelectNumber = 84;
bios.HWI.instance("HWI_INT5").useDispatcher = 1;
...
I want to set receiver trigger level as 14 bytes, and modify the some code in 'evmdm6437_uart.c', the changes are listed bellow:
uart_handle->regs->PWREMU_MGMT = 0; // Reset UART TX & RX components
_wait(100);
uart_handle->regs->DLL = (divisor & 0xff); // Set baud rate
uart_handle->regs->DLH = (divisor >> 8) & 0xff;
//uart_handle->regs->FCR = 0x0007; // Clear UART TX & RX FIFOs
//uart_handle->regs->FCR = 0x0001; // Enable TX & RX FIFOs 1-byte
uart_handle->regs->FCR = 0x00C7; // Clear UART TX & RX FIFOs
uart_handle->regs->FCR = 0x00C1; // Enable TX & RX FIFOs 14-byte
uart_handle->regs->IER = 0x0007; // Enable interrupts
uart_handle->regs->LCR = 0x0003; // 8-bit words,
// 1 STOP bit generated,
// No Parity, No Stick paritiy,
// No Break control
uart_handle->regs->MCR = 0x0000; // RTS & CTS disabled,
// Loopback mode disabled,
// Autoflow disabled
uart_handle->regs->PWREMU_MGMT = 0x6001; // Emulation Free,
// Enable TX & RX componenets
If the settings are right, the UART0 interrupt will occur only when it has received 14 bytes, is that right? But when I send ONE byte character to DM6437 EVM using ComAsistant, the UART0 receiver interrupt occurs, and the program run into the UART0_ISR(). I don't konw why?
(1) I want to set trigger level as 14 bytes, How can I modify the file 'evmdm6437_uart.c'?
(2) If the trigger level has been setted as 14 bytes, How Can I access the FIFO buffer?
Can I access the FIFO as follows?
Uint32 *data;
*data = uart_handle->regs->THR;
*(data + 4) = *(&(uart_handle->regs->THR) + 4);
*(data + 8) = *(&(uart_handle->regs->THR) + 8);
*(data +12) = *(&(uart_handle->regs->THR) + 8) & 0xFFFF;
Is that right?
I am looking forward to your suggestions!
Sincerely yours
Michael Lee
