Hi, just joined this list, not sure what the protocol is.. but I have a
question about getting I2C working on the STM32L1(52RE).
First of all, I see that there are two versions of the I2C API: v1 and v2.
Can someone explain what the difference is between these? From digging
through the library, I can see that different device families use different
versions, e.g.:
F0: v2
F1: v1
F2: v1
F3: v2
F4: v1
F7: v2
L0: v2
L1: v1
L4: v2
So when following code examples, I guess I need to find examples that use
the v1 API. In libopencm3-examples, the only STM32 I2C v1 example I could
find is this one for F1
<https://github.com/libopencm3/libopencm3-examples/tree/master/examples/stm32/f1/other/i2c_stts75_sensor>.
Unfortunately, the i2c_setup() function in this code doesn't compile for
L1, because of some differences between the RCC and GPIO API's (namely,
RCC_AFIO and gpio_set_mode() are not defined for L1). So I made some
adjustments based on my best guesses, and ended up with this code
<https://gist.github.com/chronopoulos/d34de9b6119d4ec052451d6afaa99e79>,
which compiles. But, when I monitor the I2C lines with a logic analyzer, I
see nothing. Dead silence.
Am I missing something? Can anyone provide an example of I2C being used on
STM32L1?
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