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im still stuck on getting my AIC loop routine to work i have some great help from Kieth larson but i guess im just so dum i cant see anything wrong with my code no matter how hard i look the address in the CPLD that holds the LRCIN at base address 0x80A000 knowing the base address i can then test to see when the LRCIN bit is a positive edge or a negative edge with in the address that contains the 8 bit flags. With bit 4 containing the flag for LRCIN so i dont know what i have done wrong in my code to identify the LRCIN bit. im stuck should i give up??? : ( ; ********************************************** ; * Simple loopback for PCM3003 using VC33 DSK * ; ********************************************** .include "c3xmmrs.asm" ;include memory map .start ".data",0x809C00 ;start address for data .data S0_run .word 0xEBC0000 ;Set global control register LRCIN .word 0x80A000 ;LRCIN holds the address of the CPLD. x_data .word 0x808048 r_data .word 0x80804c ; ********************************************* ; * MAIN CODE STARTS HERE * ; ********************************************* .entry INIT_DSK ; start of code INIT_DSK ldp @stack ; Set stack space ldi @stack,SP ; ldp T0_ctrl ; Use kernel data page and stack call AIC ; Initialize the AIC MAIN IDLE ;wait for interrupt b MAIN ; ****************************************************** ; * This Code Initialises the PCM3003 Codec as well as * ; * the timer0 and serial ports for 48kHz sampling. * ; ****************************************************** ;this code initialises the codec AIC ldi 0x0,R0 sti R0,@T0_ctrl ;halt the timer sti R0,@T0_prd ;zero out the counter ldi 0x3,R0 ;load a count into period register to give 12.288MHz sti R0,@T0_prd ;Now restart the timer. ldi 0x2C1,R0 ;this starts the timer running sti R0,@T0_ctrl ldi 0x111,R0 ;setup up tx and rx registers. sti R0,@S0_xctrl sti R0,@S0_rctrl ldi @S0_run,R0 sti R0,@S0_gctrl ;start serial port running. ldi 0x0,R0 sti R0,@x_data ldi 0X0,IF or 0X34,IE ;set the Xint0 Rint0 and int2 interupts or 0x2000,ST ;set the global interrupt enable(bit 14 of status) RETS ; *********************************** ; * XINT0 Interrupt Service Routine * ; *********************************** ;SAVE THE REST REGISTERS FROM THE REGISTER FILE XINT0 push ST ; save current status of register pushf R0 ; save upper 32bits of R0 push R0 ; save lower 32bits R0 push AR1 ; save AR1 ldi @LRCIN,AR2 ; load address of CPLD register into AR1 ldi *AR2,R1 ; load contents at address pointed to by AR1 into R0 and 0x10,R1 ; this isolates the LRCIN bit bnz right ; identify the channel ; *********************************** ; * Send Left Channel Sample Here * ; *********************************** ldi @r_data,AR1 ; load address of CPLD register into AR1 ldi *AR1,R0 ; load contents at address pointed to by AR1 into R0 lsh -12,R0 sti R0,@x_data ;RESTORE THE REGISTERS FROM THE REGISTER FILE pop AR1 ;restore AR1 popf R0 ;restore upper 32 bits of R0 pop R0 ;restore lower 32 bits of R0 pop ST ;restore status register reti ; *********************************** ; * RINT0 Interrupt Service Routine * ; *********************************** ;SAVE THE REST REGISTERS FROM THE REGISTER FILE RINT0 push ST ;save status register pushf R0 ;save upper 32bits of R0 push R0 ;save lower 32bits of R0 push AR1 ;save AR1 ldi @LRCIN,AR2 ; ldi *AR2,R1 ; ;Sample the LRCIN bit, and then store the data in the right place and 0x10,R1 ;isolated the LRCIN bit bnz right ;identify the channel ; *********************************** ; * Send Left Channel Sample Here * ; *********************************** ldi @r_data,AR1 ;load address of r_data into register AR1 ldi *AR1,R0 ;put the recived value into register RO lsh -12,R0 sti R0,@x_data ;RESTORE THE REGISTERS FROM THE REGISTER FILE pop AR1 ;restore AR1 popf R0 ;restore upper 32 bits of R0 pop R0 ;restore lower 32 bits of R0 pop ST ;restore status register reti ; *********************************** ; * Send right Channel Sample Here * ; *********************************** right ldi @r_data,AR1 ;load address of r_data into register AR1 ldi *AR1,R0 ;put the recived value into register RO lsh -12,R0 sti R0,@x_data ;RESTORE THE REGISTERS FROM THE REGISTER FILE pop AR1 ;restore AR1 popf R0 ;restore upper 32 bits of R0 pop R0 ;restore lower 32 bits of R0 pop ST ;restore status register reti ;====================================================================; ; By placing the stack at the end of the users runtime code, the ; ; maximum space is made available for applications. Essentialy once ; ; used initialization code or data can be reclaimed after it is used.; ; However, use this configuration for debug purposes ; ;====================================================================; .start "STACK",$ ; This is a reminder to put the stack .sect "STACK" ; stack in a safe place. $ places stack .word stack ; section at the current assy address ;****************************************************; ; Install the XINT/RINT ISR handler directly into ; ; the vector RAM location it will be used in ; ;****************************************************; .start "SP0VECT1",0x809FC5 .start "SP0VECT2",0x809FC6 .sect "SP0VECT1" BR XINT0 ; Go to routine RINT0 .sect "SP0VECT2" BR RINT0 ; Go to routine XINT0 .end |
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VC33 dsk help
Started by ●June 8, 2004
Reply by ●June 9, 20042004-06-09
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Dont give up yet. You are getting oh so very
close! Now that I look at this version of code, LRCIN is defined as a .word value that will load into AR1, so you can use this as a pointer. But you still have not quite got the hang of it when it comes to direct and indirect addressing. In particular, look at the statement where you have received data from the serial port (doing your direct followed by indirect load). What you have done is saved R0 to the location 'x_data' so nothing ever gets put into the DAC. Change this and you will at least get some distorted output (you have another problem). sti R0,@x_data Getting back to the direct/indirect. The following works but is not optimal. Read the comments here as I have made changes to them. r_data .word S0_rdata ; location of SP0 receive data ldi @r_data,AR1 ; load address of SP0 receive data into AR1 ldi *AR1,R0 ; load contents at address pointed to by AR1 into R0 lsh -12,R0 ; use the receive data Earlier you were very very close, but made a mistake ldi @S0_rdata,AR1 ; load SP0 receive data into AR1 ldi *AR1,R0 ; use that *data* as a pointer to load R0 lsh -12,R0 ; not likely what you wanted!!! What you should have done is simply used the data. I was hoping that you would have picked this up rather than using the working, but not optimal solution. ldi @S0_rdata,R0 ; load SP0 receive data directly into R0 lsh -12,R0 ; use the data Going back to the original issue, the following line has a problem. All it is doing is saving the value to the location @x_data which is the memory location you defined at the top of the listing. By the way, the minimal solution will be a single line. sti R0,@x_data ; wrongo! ; better, but not optimal ldi @x_data,AR1 ; load address of SP0 transmit data into AR1 sti R0,*AR1 ; write R0 to that address Like I said, after you fix this you should get some sound output (I did). Your next challenge is to figure out why. Maybe the left and right are getting confused? Your test for the LRCIN bit is by the way OK. Hope this helps Keith Larson male_uk00 wrote: im still stuck on getting my AIC loop routine to work i have some |
