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- # NOTE: Modified version to align with implemented I2C API in nrf port.
- #
- # Examples usage of SSD1306_SPI on pca10040
- #
- # from machine import Pin, SPI
- # from ssd1306 import SSD1306_SPI
- # spi = SPI(0, baudrate=40000000)
- # dc = Pin.board.PA11
- # res = Pin.board.PA12
- # cs = Pin.board.PA13
- # disp = SSD1306_SPI(128, 64, spi, dc, res, cs)
- #
- #
- # Example usage of SSD1306_I2C on pca10040
- #
- # from machine import Pin, I2C
- # from ssd1306_mod import SSD1306_I2C_Mod
- # i2c = I2C(0, Pin.board.PA3, Pin.board.PA4)
- # disp = SSD1306_I2C_Mod(128, 64, i2c)
- from ssd1306 import SSD1306_I2C
- SET_COL_ADDR = const(0x21)
- SET_PAGE_ADDR = const(0x22)
- class SSD1306_I2C_Mod(SSD1306_I2C):
- def show(self):
- x0 = 0
- x1 = self.width - 1
- if self.width == 64:
- # displays with width of 64 pixels are shifted by 32
- x0 += 32
- x1 += 32
- self.write_cmd(SET_COL_ADDR)
- self.write_cmd(x0)
- self.write_cmd(x1)
- self.write_cmd(SET_PAGE_ADDR)
- self.write_cmd(0)
- self.write_cmd(self.pages - 1)
- chunk_size = 254 # 255, excluding opcode.
- num_of_chunks = len(self.buffer) // chunk_size
- leftover = len(self.buffer) - (num_of_chunks * chunk_size)
- for i in range(0, num_of_chunks):
- self.write_data(self.buffer[chunk_size*i:chunk_size*(i+1)])
- if (leftover > 0):
- self.write_data(self.buffer[chunk_size * num_of_chunks:])
- def write_data(self, buf):
- buffer = bytearray([0x40]) + buf # Co=0, D/C#=1
- self.i2c.writeto(self.addr, buffer)
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