Show line number thonny11/18/2023 Super()._init_(width, height, external_vcc) amebuf = framebuf.FrameBuffer1(memoryview(self.buffer), width, height) Self.buffer = 0x40 # Set first byte of data buffer to Co=0, D/C=1 Self.buffer = bytearray(((height // 8) * width) + 1) # (without a major memory hit as memoryview doesn't copy to a separate # buffer is used to mask this byte from the framebuffer operations # to use hardware-compatible I2C transactions. # Add an extra byte to the data buffer to hold an I2C data/command byte # displays with width of 64 pixels are shifted by 32ĭef _init_(self, width, height, i2c, addr=0x3c, external_vcc=False): Self.write_cmd(SET_NORM_INV | (invert & 1)) SET_CHARGE_PUMP, 0x10 if self.external_vcc else 0x14, SET_ENTIRE_ON, # output follows RAM contents SET_PRECHARGE, 0x22 if self.external_vcc else 0xf1, SET_COM_PIN_CFG, 0x02 if self.height = 32 else 0x12, SET_COM_OUT_DIR | 0x08, # scan from COM to COM0 SET_SEG_REMAP | 0x01, # column addr 127 mapped to SEG0 # between I2C and SPI implementations (I2C needs an extra byte). # This is necessary because the underlying data buffer is different # Note the subclass must initialize amebuf to a framebuffer. #MicroPython SSD1306 OLED driver, I2C and SPI interfaces created by Adafruitĭef _init_(self, width, height, external_vcc): So, you need to upload the library to your ESP32/ESP8266 board. The library to write to the OLED display isn’t part of the standard MicroPython library by default. Note: The else block will not execute if the for loop is stopped by a break statement.Recommended reading: ESP8266 Pinout Reference Guide SSD1306 OLED Library When the loop finishes, it executes the else block and prints No items left. Here, the for loop prints all the items of the digits list. The else part is executed when the loop is exhausted (after the loop iterates through every item of a sequence). The _ symbol is used to denote that the elements of a sequence will not be used within the loop body.Ī for loop can have an optional else block. If we do not intend to use items of a sequence within the loop, we can write the loop like this: languages = The items of the list are not used within the loop. In each iteration, the loop body prints 'Hello' and 'Hi'. Here, the loop runs three times because our list has three items. It is not mandatory to use items of a sequence within a for loop. Note: To learn more about the use of for loop with range, visit Python range(). The loop continues until we reach the last item in the sequence.įlowchart of Python for Loop Working of Python for loopĮxample: Loop Through a String for x in 'Python': Here, val accesses each item of sequence on each iteration. The syntax of a for loop is: for val in sequence: This way, the loop runs until the last element of the list is accessed. Language is updated with the next element of the list, and the print statement is executed again. Swift, so the print statement inside the loop is executed. Initially, the value of language is set to the first element of the array,i.e. In the above example, we have created a list called languages. In Python, a for loop is used to iterate over sequences such as lists, tuples, string, etc.
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