mjb/altos/src/stm, branch android-build-update

altos: get ao_max6691 driver working

2019-04-21T23:54:54+00:00

The driver uses a timer connected to a DMA engine to measure pulse widths from the chip. We get 11 pulses for 4 channels; the first pulse is caused by the timer starting up, the next two are the marker pulse and then 8 more indicating the end of the high and low periods for each channel. The driver API returns the 8 pulse widths; the caller is expected to know what to do with those values as using them requires knowing the value of the configuration resistor and the characteristics of the thermistors. The test code assumes a 1k configuration resistor, using that it computes the resistance of the four thermistors. Signed-off-by: Keith Packard

altos: Work on MAX6691 driver

2019-04-21T23:54:54+00:00

altos: add ao_time_ns API

2019-02-25T23:42:25+00:00

This provides nano-second resolution times by reading the systick value (which runs at 250ns ticks on stm). Signed-off-by: Keith Packard

altos: Fix several mis-specified time types

2019-02-25T23:40:16+00:00

Make sure AO_TICK_TYPE is used "everywhere", instead of uint16_t or other. Signed-off-by: Keith Packard

altos: Fix ISR declarations to make them non-weak

2019-02-22T03:40:08+00:00

In my zeal to eliminate warnings, I added declarations of all ISR functions to a shared header file. However, I managed to include the 'weak' declaration, which meant that the intended ISR functions were as weak as the 'default' ISR functions. This left all interrupts non-functional, which doesn't make for a happy program. Signed-off-by: Keith Packard

altos: Move common build definitions to src/Makefile.defs

2019-02-18T21:08:23+00:00

This cleans up the build process for all architectures, providing a common place to specify vpath, cflags and build rules for various common files. Signed-off-by: Keith Packard

altos: Add -Wshadow to CFLAGS

2019-02-18T21:08:23+00:00

And fix up the related messages. Signed-off-by: Keith Packard

stm: Expose LCD font API in ao_lcd_font.h

2019-02-18T21:08:23+00:00

That required renaming the existing LCD font defintions from ao_lcd_font.h to ao_lcd_font_bits.h. Signed-off-by: Keith Packard

altos: Add a pile more compiler warnings

2019-02-18T21:08:23+00:00

Adds: -Wpointer-arith -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations -Wnested-externs Signed-off-by: Keith Packard

altos: Declare task stack as union of uint8_t and uint32_t

2019-02-18T21:08:23+00:00

Support -Wcast-align and -Wpointer-arith while still allowing architectures to pick whether they want an 8-bit or 32-bit stack. Signed-off-by: Keith Packard