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425 lines
15 KiB
425 lines
15 KiB
.origin 0 // start of program in PRU memory
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.entrypoint START // program entry point for the debugger
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//Copyright Doug Lewis Sept 2017
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#include <./pruadc.h>
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START:
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// Clear clock outputs to the ADS 1278
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CLR SPI_CLK_A_C_PIN
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// Clear all registers we are going to use, since we know that they can come up
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// with garbage in them
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MOV r0, 0
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MOV r1, 0
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MOV CLOCK_COUNT, 0 // R2
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MOV RUN_STATE, 0 // R3
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MOV ADC_CNTRL_STR, 0 // R4
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MOV ADC_CHNG_FLG, 0 // R5
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MOV SMPL_BIT_CNTR, 0 // R6
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MOV CHAN_BITMASK, 0 // R7
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MOV SHR_MEM_PTR, 0 // R8
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MOV SHR_MEM_SZ, 0 // R9
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MOV COUNT, 0 // R10
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MOV HEAD, 0 // R11
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MOV TAIL, 0 // R12
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MOV PRU_DATA_STRT, 0 // R13
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MOV CURRENT_SAMPLE, 0 // R14
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MOV CURRENT_BUF, 0 // R15
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MOV CUR_BUF_ADRS, 0 // R16
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MOV CUR_BUF_LEFT, 0 // R17
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MOV SHR_MEM_START, 0 // R18
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MOV NUM_BLOCKS, 0 // R19
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MOV BUFF_COUNT, 0 // R20
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MOV SAMPLE1 , 0 // R21
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MOV SAMPLE2 , 0 // R22
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MOV SAMPLE3 , 0 // R23
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MOV SAMPLE4 , 0 // R24
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MOV SAMPLE5 , 0 // R25
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MOV SAMPLE6 , 0 // R26
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MOV SAMPLE7 , 0 // R27
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MOV SAMPLE8 , 0 // R28
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MOV WRAP_COUNT, 0 // R29
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// Enable the OCP master port -- allows transfer of data to Linux userspace
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LBCO r0, C4, 4, 4 // load PRU-ICSS CFG reg into r0
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CLR r0, r0, 4 // clear bit 4 (STANDBY_INIT)
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SBCO r0, C4, 4, 4 // store the modified r0 back at the load addr
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START_LOOP: // This is an easy place to halt the debugger
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MOV r1,ADC_STATE_ADDR
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LBBO RUN_STATE, r1, 0, 4 // the daq state is now loaded into r3.
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QBEQ START_LOOP, RUN_STATE, 0 // We hang out in a loop until told to read the adc
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MOV r1,ADC_ADDR //
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LBBO SHR_MEM_PTR, r1, 0, 4 // load the Linux address that is passed into r8 -- to store sample values
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MOV R1, PRU0_START_OFFSET
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ADD PRU_DATA_STRT, SHR_MEM_START, R1
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MOV SHR_MEM_PTR, PRU_DATA_STRT
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MOV r1,ADC_SIZE //
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LBBO SHR_MEM_SZ, r1, 0, 4 // load the size that is passed into r9 -- the number of samples to take
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MOV r1,PRU0_NUM_BLOCKS //
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LBBO NUM_BLOCKS, r1, 0, 4 // load the count of how many 128K blocks we are going to record
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MEM_BUF_ALLOCATED:
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MOV CUR_BUF_LEFT, BUFSIZE
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MOV r1,ADC_CNTRL_CHANGE // load the base address into r1
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LBBO ADC_CHNG_FLG, r1, 0, 4 // the ADC_CNTL_CHANGE is now loaded into R5
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QBBS CONFIG_CHANGE, ADC_CHNG_FLG.t0 // If bit 1 of ADC_CTRL_CHANGE is set, there is a config
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//change
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QBA CONFIG_DONE // Else no changes, goto CONFIG_DONE
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CONFIG_CHANGE:
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MOV r1, CLOCK_CNTR_ADDR
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LBBO CLOCK_COUNT, r1, 0, 4 // the clock delay is now loaded into r2.
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MOV r1,ADC_CNTRL_STR_ADDR
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LBBO ADC_CNTRL_STR, r1, 0, 4 // the ADC_CNTL_STR is now loaded into R4
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CLR ADC_CHNG_FLG.t1 // Clear the change flag so we dont do the config every loop
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CONFIG_DONE:
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//We want to look at the first bit in the config bitmask.
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READ_NEXT_SAMPLE:
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MOV r1,ADC_STATE_ADDR //Check to see if we are still need to be running
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LBBO RUN_STATE, r1, 0, 4
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QBEQ CONTINUE_DAQ, RUN_STATE, 1
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HALT // We've been told to stop.
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CONTINUE_DAQ:
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MOV SAMPLE1, 0
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MOV SAMPLE2, 0
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MOV SAMPLE3, 0
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MOV SAMPLE4, 0
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MOV SAMPLE5, 0
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MOV SAMPLE6, 0
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MOV SAMPLE7, 0
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MOV SAMPLE8, 0
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// We check data ready to make sure the ADC has had a chance to initialize and set dready high before sampling.
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DATA_READY_HIGH:
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QBBS DATA_READY_WAIT, SPI_DSR_A_C_PIN
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QBA DATA_READY_HIGH
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DATA_READY_WAIT:
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QBBC DATA_READY, SPI_DSR_A_C_PIN // If Data Ready line clear, read a sample
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QBA DATA_READY_WAIT // Else hang out in a tight loop ...
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DATA_READY:
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MOV SMPL_BIT_CNTR, SAMPLE_SIZE // We're going to read 24 bits
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READ_CHANNEL1:
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MOV r0, CLOCK_COUNT // Reload the clock delay val into R0
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SET SPI_CLK_A_C_PIN // set the clock line to be high
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DELAYON1:
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SUB r0, r0, 1
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QBNE DELAYON1, r0, 0
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CLR SPI_CLK_A_C_PIN // set the clock to be low
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// Read Data In
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QBBC ZERO_BIT1, SPI_DATA_IN_A_C_PIN // Check to see whether Data In is a 0 or 1
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OR SAMPLE1, SAMPLE1, 0x00000001
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ZERO_BIT1:
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LSL SAMPLE1, SAMPLE1, 1 // Shift current sample contents left by one
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MOV r0, CLOCK_COUNT
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DELAYOFF1:
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SUB r0, r0, 1
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QBNE DELAYOFF1, r0, 0 // loop until the delay has expired (equals 0)
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SUB SMPL_BIT_CNTR, SMPL_BIT_CNTR, 1 // See if we have read all 24 bits of the sample
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QBNE READ_CHANNEL1, SMPL_BIT_CNTR, 0
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//////////////////////////
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MOV SMPL_BIT_CNTR, SAMPLE_SIZE // We're going to read 24 bits
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READ_CHANNEL2:
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MOV r0, CLOCK_COUNT // Reload the clock delay val into R0
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SET SPI_CLK_A_C_PIN // set the clock to be high
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DELAYON2:
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SUB r0, r0, 1
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QBNE DELAYON2, r0, 0
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// Reload the clock delay val into R0
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CLR SPI_CLK_A_C_PIN // set the clock to be low
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// Read Data In
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QBBC ZERO_BIT2, SPI_DATA_IN_A_C_PIN // Check to see whether Data In is a 0 or 1
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OR SAMPLE2, SAMPLE2, 0x00000001
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ZERO_BIT2:
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LSL SAMPLE2, SAMPLE2, 1 // Shift current sample contents left by one
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SUB SMPL_BIT_CNTR, SMPL_BIT_CNTR, 1 // See if we have read all 24 bits of the sample
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MOV r0, CLOCK_COUNT
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DELAYOFF2:
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SUB r0, r0, 1
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QBNE DELAYOFF2, r0, 0 // loop until the delay has expired (equals 0)
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QBNE READ_CHANNEL2, SMPL_BIT_CNTR, 0
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//////////////////////
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MOV SMPL_BIT_CNTR, SAMPLE_SIZE // We're going to read 24 bits
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READ_CHANNEL3:
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MOV r0, CLOCK_COUNT // Reload the clock delay val into R0
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SET SPI_CLK_A_C_PIN // set the clock to be high
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DELAYON3:
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SUB r0, r0, 1
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QBNE DELAYON3, r0, 0
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// Reload the clock delay val into R0
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CLR SPI_CLK_A_C_PIN // set the clock to be low
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// Read Data In
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QBBC ZERO_BIT3, SPI_DATA_IN_A_C_PIN // Check to see whether Data In is a 0 or 1
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OR SAMPLE3, SAMPLE3, 0x00000001
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ZERO_BIT3:
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LSL SAMPLE3, SAMPLE3, 1 // Shift current sample contents left by one
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SUB SMPL_BIT_CNTR, SMPL_BIT_CNTR, 1 // See if we have read all 24 bits of the sample
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MOV r0, CLOCK_COUNT
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DELAYOFF3:
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SUB r0, r0, 1
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QBNE DELAYOFF3, r0, 0 // loop until the delay has expired (equals 0)
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QBNE READ_CHANNEL3, SMPL_BIT_CNTR, 0
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/////////////////////////
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MOV SMPL_BIT_CNTR, SAMPLE_SIZE // We're going to read 24 bits
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READ_CHANNEL4:
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MOV r0, CLOCK_COUNT // Reload the clock delay val into R0
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SET SPI_CLK_A_C_PIN // set the clock to be high
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DELAYON4:
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SUB r0, r0, 1
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QBNE DELAYON4, r0, 0
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// Reload the clock delay val into R0
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CLR SPI_CLK_A_C_PIN // set the clock to be low
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// Read Data In
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QBBC ZERO_BIT4, SPI_DATA_IN_A_C_PIN // Check to see whether Data In is a 0 or 1
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OR SAMPLE4, SAMPLE4, 0x00000001
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ZERO_BIT4:
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LSL SAMPLE4, SAMPLE4, 1 // Shift current sample contents left by one
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SUB SMPL_BIT_CNTR, SMPL_BIT_CNTR, 1 // See if we have read all 24 bits of the sample
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MOV r0, CLOCK_COUNT
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DELAYOFF4:
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SUB r0, r0, 1
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QBNE DELAYOFF4, r0, 0 // loop until the delay has expired (equals 0)
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QBNE READ_CHANNEL4, SMPL_BIT_CNTR, 0
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/////////////////////////
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MOV SMPL_BIT_CNTR, SAMPLE_SIZE // We're going to read 24 bits
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READ_CHANNEL5:
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MOV r0, CLOCK_COUNT // Reload the clock delay val into R0
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SET SPI_CLK_A_C_PIN // set the clock to be high
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DELAYON5:
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SUB r0, r0, 1
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QBNE DELAYON5, r0, 0
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// Reload the clock delay val into R0
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CLR SPI_CLK_A_C_PIN // set the clock to be low
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// Read Data In
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QBBC ZERO_BIT5, SPI_DATA_IN_A_C_PIN // Check to see whether Data In is a 0 or 1
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OR SAMPLE5, SAMPLE5, 0x00000001
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ZERO_BIT5:
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LSL SAMPLE5, SAMPLE5, 1 // Shift current sample contents left by one
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SUB SMPL_BIT_CNTR, SMPL_BIT_CNTR, 1 // See if we have read all 24 bits of the sample
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MOV r0, CLOCK_COUNT
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DELAYOFF5:
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SUB r0, r0, 1
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QBNE DELAYOFF5, r0, 0 // loop until the delay has expired (equals 0)
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QBNE READ_CHANNEL5, SMPL_BIT_CNTR, 0
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/////////////////////////
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MOV SMPL_BIT_CNTR, SAMPLE_SIZE // We're going to read 24 bits
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READ_CHANNEL6:
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MOV r0, CLOCK_COUNT // Reload the clock delay val into R0
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SET SPI_CLK_A_C_PIN // set the clock to be high
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DELAYON6:
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SUB r0, r0, 1
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QBNE DELAYON6, r0, 0
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// Reload the clock delay val into R0
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CLR SPI_CLK_A_C_PIN // set the clock to be low
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// Read Data In
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QBBC ZERO_BIT6, SPI_DATA_IN_A_C_PIN // Check to see whether Data In is a 0 or 1
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OR SAMPLE6, SAMPLE6, 0x00000001
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ZERO_BIT6:
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LSL SAMPLE6, SAMPLE6, 1 // Shift current sample contents left by one
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SUB SMPL_BIT_CNTR, SMPL_BIT_CNTR, 1 // See if we have read all 24 bits of the sample
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MOV r0, CLOCK_COUNT
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DELAYOFF6:
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SUB r0, r0, 1
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QBNE DELAYOFF6, r0, 0 // loop until the delay has expired (equals 0)
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QBNE READ_CHANNEL6, SMPL_BIT_CNTR, 0
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/////////////////////////
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MOV SMPL_BIT_CNTR, SAMPLE_SIZE // We're going to read 24 bits
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READ_CHANNEL7:
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MOV r0, CLOCK_COUNT // Reload the clock delay val into R0
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SET SPI_CLK_A_C_PIN // set the clock to be high
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DELAYON7:
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SUB r0, r0, 1
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QBNE DELAYON7, r0, 0
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// Reload the clock delay val into R0
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CLR SPI_CLK_A_C_PIN // set the clock to be low
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// Read Data In
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QBBC ZERO_BIT7, SPI_DATA_IN_A_C_PIN // Check to see whether Data In is a 0 or 1
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OR SAMPLE7, SAMPLE7, 0x00000001
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ZERO_BIT7:
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LSL SAMPLE7, SAMPLE7, 1 // Shift current sample contents left by one
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SUB SMPL_BIT_CNTR, SMPL_BIT_CNTR, 1 // See if we have read all 24 bits of the sample
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MOV r0, CLOCK_COUNT
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DELAYOFF7:
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SUB r0, r0, 1
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QBNE DELAYOFF7, r0, 0 // loop until the delay has expired (equals 0)
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QBNE READ_CHANNEL7, SMPL_BIT_CNTR, 0
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/////////////////////////
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MOV SMPL_BIT_CNTR, SAMPLE_SIZE // We're going to read 24 bits
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READ_CHANNEL8:
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MOV r0, CLOCK_COUNT // Reload the clock delay val into R0
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SET SPI_CLK_A_C_PIN // set the clock to be high
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DELAYON8:
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SUB r0, r0, 1
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QBNE DELAYON8, r0, 0
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// Reload the clock delay val into R0
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CLR SPI_CLK_A_C_PIN // set the clock to be low
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// Read Data In
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QBBC ZERO_BIT8, SPI_DATA_IN_A_C_PIN // Check to see whether Data In is a 0 or 1
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OR SAMPLE8, SAMPLE8, 0x00000001
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ZERO_BIT8:
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LSL SAMPLE8, SAMPLE8, 1 // Shift current sample contents left by one
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SUB SMPL_BIT_CNTR, SMPL_BIT_CNTR, 1 // See if we have read all 24 bits of the sample
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MOV r0, CLOCK_COUNT
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DELAYOFF8:
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SUB r0, r0, 1
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QBNE DELAYOFF8, r0, 0 // loop until the delay has expired (equals 0)
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QBNE READ_CHANNEL8, SMPL_BIT_CNTR, 0
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/////////////////////////
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STORE_SAMPLE:
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LSR SAMPLE1, SAMPLE1, 1 // Need to shift the sample word back to the right by one
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LSR SAMPLE2, SAMPLE2, 1
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LSR SAMPLE3, SAMPLE3, 1
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LSR SAMPLE4, SAMPLE4, 1
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LSR SAMPLE5, SAMPLE5, 1
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LSR SAMPLE6, SAMPLE6, 1
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LSR SAMPLE7, SAMPLE7, 1
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LSR SAMPLE8, SAMPLE8, 1
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MOV SAMPLE1.b3, 0x01 // Stash the channel bitmask in the upper byte used to store the sample
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MOV SAMPLE2.b3, 0x02
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MOV SAMPLE3.b3, 0x04
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MOV SAMPLE4.b3, 0x08
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MOV SAMPLE5.b3, 0x10
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MOV SAMPLE6.b3, 0x20
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MOV SAMPLE7.b3, 0x40
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MOV SAMPLE8.b3, 0x80
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SBBO SAMPLE1, SHR_MEM_PTR, 0, 4 // store the sample value into shared memory space
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ADD SHR_MEM_PTR, SHR_MEM_PTR, 4 // Add 4 bytes per sample to the address pointer
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SBBO SAMPLE2, SHR_MEM_PTR, 0, 4 // store the sample value into shared memory space
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ADD SHR_MEM_PTR, SHR_MEM_PTR, 4 // Add 4 bytes per sample to the address pointer
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SBBO SAMPLE3, SHR_MEM_PTR, 0, 4 // store the sample value into shared memory space
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ADD SHR_MEM_PTR, SHR_MEM_PTR, 4 // Add 4 bytes per sample to the address pointer
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SBBO SAMPLE4, SHR_MEM_PTR, 0, 4 // store the sample value into shared memory space
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ADD SHR_MEM_PTR, SHR_MEM_PTR, 4 // Add 4 bytes per sample to the address pointer
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SBBO SAMPLE5, SHR_MEM_PTR, 0, 4 // store the sample value into shared memory space
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ADD SHR_MEM_PTR, SHR_MEM_PTR, 4 // Add 4 bytes per sample to the address pointer
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SBBO SAMPLE6, SHR_MEM_PTR, 0, 4 // store the sample value into shared memory space
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ADD SHR_MEM_PTR, SHR_MEM_PTR, 4 // Add 4 bytes per sample to the address pointer
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SBBO SAMPLE7, SHR_MEM_PTR, 0, 4 // store the sample value into shared memory space
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ADD SHR_MEM_PTR, SHR_MEM_PTR, 4 // Add 4 bytes per sample to the address pointer
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SBBO SAMPLE8, SHR_MEM_PTR, 0, 4 // store the sample value into shared memory space
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ADD SHR_MEM_PTR, SHR_MEM_PTR, 4 // Add 4 bytes per sample to the address pointer
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SUB CUR_BUF_LEFT, CUR_BUF_LEFT, 32 // reducing the number of samples - 4 bytes per sample, 8 channels
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QBEQ BUFFER_DONE, CUR_BUF_LEFT, 0 // See if we have taken 128kb of samples
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QBA READ_NEXT_SAMPLE // If we've looped thru all channels in the sample. wait for the next sample
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BUFFER_DONE:
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MOV CUR_BUF_LEFT, BUFSIZE
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// If we have recorded all of the buffers that we need to, then halt.
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SUB NUM_BLOCKS, NUM_BLOCKS, 1
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QBEQ END, NUM_BLOCKS, 0
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MOV R1, BUFSIZE
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ADD CUR_BUF_ADRS, CUR_BUF_ADRS, R1
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MOV r1, SHARED_MEM_SIZE
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QBEQ WRAP_TIME, CUR_BUF_ADRS, r1
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QBA READ_NEXT_SAMPLE
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WRAP_TIME:
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// Always wanted to be a rapper ;-0)
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// We have used all the shared memory to write samples, wrap back to the beginning.
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MOV CUR_BUF_ADRS, 0
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MOV r31.b0, PRU0_R31_VEC_VALID | PRU_EVTOUT_0
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HALT //DEBUG
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QBA READ_NEXT_SAMPLE
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// halt the pru program -- we reach here when the file is full.
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END:
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HALT
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