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set raspberry pi pico as slave i2c

yuval kalan answered on February 10, 2023 Popularity 2/10 Helpfulness 8/10

answer set raspberry pi pico as slave i2c

set raspberry pi pico as slave i2c

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#pico code (slave) --------------------------------------------------------------

from machine import mem32, Pin
import utime

I2C0_BASE = 0x40044000
I2C1_BASE = 0x40048000
IO_BANK0_BASE = 0x40014000

mem_rw = 0x0000
mem_xor = 0x1000
mem_set = 0x2000
mem_clr = 0x3000

IC_CON = 0
IC_TAR = 4
IC_SAR = 8
IC_DATA_CMD = 0x10
IC_RX_TL = 0x38
IC_TX_TL = 0x3C
IC_CLR_INTR = 0x40
IC_ENABLE = 0x6c
IC_STATUS = 0x70


class I2CSlave:
    def __init__(self, i2c_id=0, sda=0, scl=1, address=0x41):
        self._scl = scl
        self._sda = sda
        self._address = address
        self._i2c_id = i2c_id
        if self._i2c_id == 0:
            self._i2c_base = I2C0_BASE
        else:
            self._i2c_base = I2C1_BASE

        # 1 Disable DW_apb_i2c
        self.clr_reg(IC_ENABLE, 1)
        # 2 set slave address
        # clr bit 0 to 9
        # set slave address
        self.clr_reg(IC_SAR, 0x1ff)
        self.set_reg(IC_SAR, self._address & 0x1ff)
        # 3 write IC_CON  7 bit, enable in slave-only
        self.clr_reg(IC_CON, 0b01001001)
        # set SDA PIN
        mem32[IO_BANK0_BASE | mem_clr | (4 + 8 * self._sda)] = 0x1f
        mem32[IO_BANK0_BASE | mem_set | (4 + 8 * self._sda)] = 3
        # set SLA PIN
        mem32[IO_BANK0_BASE | mem_clr | (4 + 8 * self._scl)] = 0x1f
        mem32[IO_BANK0_BASE | mem_set | (4 + 8 * self._scl)] = 3
        # 4 enable i2c
        self.set_reg(IC_ENABLE, 1)

    def write_reg(self, reg, data, method=0):
        mem32[self._i2c_base | method | reg] = data

    def set_reg(self, reg, data):
        self.write_reg(reg, data, method=mem_set)

    def clr_reg(self, reg, data):
        self.write_reg(reg, data, method=mem_clr)

    def any(self):
        # get IC_STATUS
        status = mem32[self._i2c_base | IC_STATUS]
        # check RFNE receive fifio not empty
        if status & 8:
            return True
        return False

    def get(self):
        while not self.any():
            pass
        return mem32[self._i2c_base | IC_DATA_CMD] & 0xff

s_i2c = I2CSlave(0, sda=0, scl=1, address=0x41)
try:
	while True:
    	print(chr(s_i2c.get()))
except KeyboardInterrupt:
  	pass
      
# raspberry code (master) -------------------------------------------------------
import smbus
bus = smbus.SMBus(1)
msg = 'message'
for c in msg:
    bus.write_byte(0x45, ord(c))

credit to https://python-academia.com/en/raspberry-pi-pico-slave/

Popularity 2/10 Helpfulness 8/10 Language python

Source: Grepper

Tags: i2c python raspberry-pi set slave

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Contributed on Feb 10 2023

yuval kalan

0 Answers Avg Quality 2/10

set raspberry pi pico as slave i2c

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