【RPi PICO】用内联汇编实现触发器ADC采样和寄存器查看
<p>原帖：https://forum.micropython.org/viewtopic.php?t=9910&p=55444</p><p> </p>
<p>查看硬件寄存器，并在adc0提供采样。它以给定的频率（最高 500.000 次/秒）将数据放入缓冲区</p>
<p> </p>
<pre>
<code class="language-python">title= "inlineG.py" # http://docs.micropython.org/en/v1.9.3/pyboard/pyboard/tutorial/assembler.html
# by CWE
from rp2 import *
from machine import *
from time import *
import uarray
led= Pin(25,Pin.OUT)
#led(1)
#sleep(0.2)
#led(0)
adc0=ADC(0)
ledData = uarray.array('i',[
0xd0000000 + 0x010, # 0 SIO OUT
0xd0000000 + 0x018, # 4 SIO OUT_CLR
0xd0000000 + 0x014, # 8 SIO OUT_SET
1<<25 # 12 LED MASK
])
@micropython.asm_thumb
def regPeek(r0): # Address
mov(r1,r0)
ldr(r0,)
@micropython.asm_thumb
def regPoke(r0, r1): # Address, Data
str(r1,)
mov(r0,r1)
def regSet(adress, mask):
regPoke(adress, regPeek(adress) | mask)
rGPIO26= 0x4001c000+0x6c # S. 312
regPoke( rGPIO26, 1<<7 ) # switch off ADC0 input and output
adcBuf = uarray.array('h',range(0,20)) # 320 signed short
adcCtrl = uarray.array('i',[
0x4004c000, # BASE 0 CS, 4 Result, 8 FCS, 12 FIFO, 16 DIV S. 570
1, # 4 Status: 0 done, 1 start
len(adcBuf), # 8
1, # 12 trig sign 1= positive
2048 - 100, # 16 trigLevel
2048 + 100 # 20 trigger level
])
@micropython.asm_thumb
def adcGet(r0, r1): # BufferAddress, Ctrl-Array
b(Entry)
#b(StartSample)
label(GetAdc) # get one sample out of the fifo
ldr(r2,)
ldrh(r2,) # read upper Half of FCS - something in the fifo?
cmp(r2,0)
bls(GetAdc)
ldr(r2,)
ldr(r2,) # read FIFO
bx(lr)
label(Entry)
mov(r4,r0) # BufferAdress
ldr(r3,) # Trigger Level
mov(r0,r3)
#cpsid(1)
bl(GetAdc) # empty fifo
bl(GetAdc)
bl(GetAdc)
bl(GetAdc)
bl(GetAdc)
bl(GetAdc)
label(WaitLow)
bl(GetAdc)
cmp(r2,r3)
bgt(WaitLow)
ldr(r3,) # Upper Trigger Level
label(WaitHigh)
bl(GetAdc)
cmp(r3,r2)
bgt(WaitHigh)
label(StartSample)
ldr(r3,) # Buffer Length
label(GetNext)
bl(GetAdc)
strh(r2,)
add(r4,r4,2) # next address
sub(r3,r3,1)
cmp(r3,0)
bhi(GetNext)
#cpsie(1)
label(End)
print(title)
adc0.read_u16() # set up the channel
maxSample= 48e6 # Hz
fSample= 250_000 # This is the sampling frequency!
div= int(maxSample/fSample)
print("Div:", div)
regPoke(0x4004c000 + 0x10, div<<8) # set DIV register
#print("Div:", "{0:b}".format(regPeek(0x4004c000 + 0x10)))
regSet(0x4004c000 + 0x08, 1) # set fifo enable
#print("CS:", "{0:b}".format(regPeek(0x4004c000 + 0x00)))
regSet(0x4004c000, 1<<3) # set startmany
#print("CS:", "{0:b}".format(regPeek(0x4004c000 + 0x00)))
#while True:
#print(adcGet(adcBuf, adcCtrl))
led(1)
adcGet(adcBuf, adcCtrl)
led(0)
for i in range(0,len(adcBuf)):
print(adcBuf)
</code></pre>
<p> </p>
<p>高级！</p>
<p>又看到MOV指令了</p>
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