Merge pull request #50 from emeb/master

examples/adc_dma_opamp/Makefile

examples/adc_dma_opamp/adc.h

examples/adc_dma_opamp/adc_dma_opamp.c

examples/adc_dma_opamp/opamp.h

examples/adc_polled/Makefile

examples/adc_polled/adc.h

examples/adc_polled/adc_polled.c

examples/i2c_oled/Makefile

examples/i2c_oled/i2c.h

examples/spi_dac/Makefile

examples/spi_dac/spi_dac.c

examples/spi_dac/spidac.h

examples/systick_irq/Makefile

examples/systick_irq/systick.h

examples/systick_irq/systick_irq.c

examples/tim1_pwm/t1pwm.h

examples/tim1_pwm/tim1_pwm.c