Implement linux-i2c vesion of I2C library for use in Ubuntu platform #9
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…e bus. There's a difference between 'bus number' (0 or 1 in mgos) and 'device number' (/dev/i2c-* in linux)
rojer
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Jan 24, 2019
…nter, use c==NULL; bugfix: Valid file descriptors can be 0.
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Author: @pimvanpelt (#9) This adds i2c.dev_no to mos.yml, which instructs the driver to open /dev/i2c-? as backend for I2C. It then implements a Linux I2C version of the driver, using ioctl() to select the slave, and read/write to write to it. Notes: Linux doesn't have a call to free/reset the bus Linux doesn't expose the underlying SCL/SDA pins, so bitbanging a reset is not possible. Linux doesn't allow stop bit to be absent (!) Linux only supports 100KHz frequency. Basic functionality works -- reading and writing, SMBUS register read/write, and scanning. CL: ubuntu: Implement linux-i2c vesion of I2C library for use in Ubuntu platform PUBLISHED_FROM=794b7309c24d382ab9287f09bb9e56b961d6db17
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Author: @pimvanpelt (mongoose-os-libs/i2c#9) This adds i2c.dev_no to mos.yml, which instructs the driver to open /dev/i2c-? as backend for I2C. It then implements a Linux I2C version of the driver, using ioctl() to select the slave, and read/write to write to it. Notes: Linux doesn't have a call to free/reset the bus Linux doesn't expose the underlying SCL/SDA pins, so bitbanging a reset is not possible. Linux doesn't allow stop bit to be absent (!) Linux only supports 100KHz frequency. Basic functionality works -- reading and writing, SMBUS register read/write, and scanning. CL: ubuntu: Implement linux-i2c vesion of I2C library for use in Ubuntu platform PUBLISHED_FROM=794b7309c24d382ab9287f09bb9e56b961d6db17
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This adds
i2c.dev_noto mos.yml, which instructs the driver to open /dev/i2c-? as backend for I2C.It then implements a Linux I2C version of the driver, using ioctl() to select the slave, and read/write to write to it.
Notes:
Basic functionality works -- reading and writing, SMBUS register read/write, and scanning.