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