from I2Sduplex import I2Sduplex
from dma import DMA
import time, uctypes, array
import micropython
#from machine import Pin

print("Initialising audio interface...")
i2s = I2Sduplex()
DMA.abort_all()

PIO0_BASE      = 0x50200000
PIO0_BASE_TXF0 = PIO0_BASE + 0x10
PIO0_BASE_RXF0 = PIO0_BASE + 0x20


#buf = bytes(range(256))
txBuf0 = bytearray(array.array('l', [x for x in range(64)]))
txBuf1 = bytearray(array.array('l', [x-64 for x in range(64)]))
rxBuf0 = bytearray(256)
rxBuf1 = bytearray(256)
tx0 = uctypes.addressof(txBuf0)
tx1 = uctypes.addressof(txBuf1)
rx0 = uctypes.addressof(rxBuf0)
rx1 = uctypes.addressof(rxBuf1)

dma = [DMA(0), DMA(1), DMA(2), DMA(3)]
dma[0].config( 
    read_addr = uctypes.addressof(txBuf0), 
    write_addr = PIO0_BASE_TXF0,
    trans_count = len( txBuf0 ) // 4, 
    read_inc = True, 
    write_inc = False, 
    data_size = DMA.SIZE_WORD,
    treq_sel = DMA.DREQ_PIO0_TX0,
    chain_to = 1
)
dma[1].config( 
    read_addr = uctypes.addressof(txBuf1), 
    write_addr = PIO0_BASE_TXF0,
    trans_count = len( txBuf1 ) // 4, 
    read_inc = True, 
    write_inc = False,
    data_size = DMA.SIZE_WORD,
    treq_sel = DMA.DREQ_PIO0_TX0,
    chain_to = 0
)
dma[2].config( 
    read_addr = PIO0_BASE_RXF0, 
    write_addr = uctypes.addressof(rxBuf0),
    trans_count = len( rxBuf0 ) // 4, 
    read_inc = False, 
    write_inc = True, 
    data_size = DMA.SIZE_WORD,
    treq_sel = DMA.DREQ_PIO0_RX0,
    chain_to = 3
)
dma[3].config( 
    read_addr = PIO0_BASE_RXF0, 
    write_addr = uctypes.addressof(rxBuf1),
    trans_count = len( rxBuf1 ) // 4, 
    read_inc = False, 
    write_inc = True, 
    data_size = DMA.SIZE_WORD,
    treq_sel = DMA.DREQ_PIO0_RX0,
    chain_to = 2
)

i2s.sm.active(1)

dma[0].enable()
dma[1].enable_notrigger()
dma[2].enable()
dma[3].enable_notrigger()

@micropython.viper
def processBuffer(rx : ptr32, tx : ptr32):
    n = 0
    while n < 64:
        tx[n] = tx[n] + 128
        n += 1
    return

nextBuffer = 1
buffsDone = 0
while(buffsDone < 50):
    if(nextBuffer == 0 and not dma[0].is_busy() and not dma[2].is_busy()):
        #gp.high()
        machine.mem32[dma[0].READ_ADDR] = uctypes.addressof(txBuf0)
        machine.mem32[dma[2].WRITE_ADDR] = uctypes.addressof(rxBuf0)         
        processBuffer(rxBuf0, txBuf0)
        nextBuffer = 1
        buffsDone += 1
        #gp.low()            
    if(nextBuffer == 1 and not dma[1].is_busy() and not dma[3].is_busy()):
        #gp.high()
        machine.mem32[dma[1].READ_ADDR] = uctypes.addressof(txBuf1)
        machine.mem32[dma[3].WRITE_ADDR] = uctypes.addressof(rxBuf1)
        processBuffer(rxBuf1, txBuf1)
        nextBuffer = 0
        buffsDone += 1
        #gp.low()



DMA.abort_all()
i2s.sm.active(0)