ESP32 Square Waves

# RMT1   5/15/22 rr
# continuous 5 MHz square wave
import esp32
from machine import Pin
r = esp32.RMT(0, pin=Pin(22), clock_div=8)
r.loop(True)
r.write_pulses((1,0))


#RMT2   5/15/22 rr
# configure 7 channels to output different frequency square waves simultaneously
import esp32
from machine import Pin

r15 = esp32.RMT(0, pin=Pin(15), clock_div=160) #    250,000 Hz pin D15
r16 = esp32.RMT(1, pin=Pin(16), clock_div=80)  #    500,000 Hz pin RX2
r17 = esp32.RMT(2, pin=Pin(17), clock_div=40)  #  1,000,000 Hz pin TX2
r18 = esp32.RMT(3, pin=Pin(18), clock_div=20)  #  2,000,000 Hz pin D18
r19 = esp32.RMT(4, pin=Pin(19), clock_div=16)  #  2,500,000 Hz pin D19
r21 = esp32.RMT(5, pin=Pin(21), clock_div=10)  #  4,000,000 Hz pin D21
r22 = esp32.RMT(6, pin=Pin(22), clock_div=8)   #  5,000,000 Hz pin D22

r15.loop(True), r16.loop(True), r17.loop(True), r18.loop(True)
r19.loop(True), r21.loop(True), r22.loop(True)

r15.write_pulses((1, 0))
r16.write_pulses((1, 0))
r17.write_pulses((1, 0))
r18.write_pulses((1, 0))
r19.write_pulses((1, 0))
r21.write_pulses((1, 0))
r22.write_pulses((1, 0))


#RMT3   5/15/22/rr
# read the RMT RAM configured by the r.write_pulses statement
import esp32
from machine import mem32, Pin
from micropython import const

RMT_RAM1 = const(0x3FF56800) # RMT RAM pulses 1-2; start of channel 0 RAM
RMT_RAM2 = const(0x3FF56804) # RMT RAM pulses 3-4
RMT_RAM3 = const(0x3FF56808) # RMT RAM pulses 5-6
RMT_RAM4 = const(0x3FF5680C) # RMT RAM pulses 7-8
RMT_RAM5 = const(0x3FF56810) # RMT RAM pulses 9-10
RMT_RAM6 = const(0x3FF56814) # RMT RAM zero to indicate end of transmission

r = esp32.RMT(0, pin=Pin(22), clock_div=8, idle_level=False)
r.write_pulses((10, 9, 8, 7, 6, 5, 4, 3, 2, 1),1)

value1 = '{:032b}'.format(int(hex(mem32[RMT_RAM1])))
print('RMT_RAM1 =',' '.join(value1[i:i+4] for i in range(0,len(value1),4)))

value2 = '{:032b}'.format(int(hex(mem32[RMT_RAM2])))
print('RMT_RAM2 =',' '.join(value2[i:i+4] for i in range(0,len(value2),4)))

value3 = '{:032b}'.format(int(hex(mem32[RMT_RAM3])))
print('RMT_RAM3 =',' '.join(value3[i:i+4] for i in range(0,len(value3),4)))

value4 = '{:032b}'.format(int(hex(mem32[RMT_RAM4])))
print('RMT_RAM4 =',' '.join(value4[i:i+4] for i in range(0,len(value4),4)))

value5 = '{:032b}'.format(int(hex(mem32[RMT_RAM5])))
print('RMT_RAM5 =',' '.join(value5[i:i+4] for i in range(0,len(value5),4)))

value6 = '{:032b}'.format(int(hex(mem32[RMT_RAM6])))
print('RMT_RAM6 =',' '.join(value6[i:i+4] for i in range(0,len(value5),4)))


#RMT4   5/11/22 rr
# practice code to format output
value1 = 0x01234567  # plug in any 32 bit value

print(hex(value1)) # hex, no leading zeroes
print('0x'+'{:08X}'.format(value1)) # hex & leading zeroes
print('{:010}'.format(int(hex(value1)))) # decimal & leading zeroes
print('{:032b}'.format(int(hex(value1)))) # binary 32 bits
value2 = ('{:032b}'.format(int(bin(value1)))) # binary 8 groups of 4 digits
print(' '.join(value2[i:i+4] for i in range(0,len(value2),4)))