mjb/altos/src/stmf0, branch debian/1.6.8-4

altos/arm: Align data so that gcc 5.4 doesn't do byte-accesses. Add -Wcast-align

2017-01-25T19:21:43+00:00

Gcc 5.4.1 tracks alignment of data through assignments, so that a uint32_t pointer which comes from byte-aligned uint8_t data: extern uint8_t foo[]; uint32_t *q = (void *) foo; Fetches and stores through this pointer are done bytewise. This is slow (meh), but if q references a device register, things to bad very quickly. This patch works around this bug in the compiler by adding __attribute__((aligned(4))) tags to some variables, or changing them from uint8_t to uint32_t. Places doing this will now be caught as I've added -Wcast-align to the compiler flags. That required adding (void *) casts, after the relevant code was checked to make sure the compiler could tell that the addresses were aligned. Signed-off-by: Keith Packard

altos/stmf0: Switch ADC fast to ADC clock

2016-08-09T05:39:16+00:00

Using this slower clock eliminates sampling problems with the ADC and cleans up the chaoskey raw data. Signed-off-by: Keith Packard

altos/stmf0: Clean .bin files from flash-loader dirs

2016-08-02T23:55:11+00:00

The .bin files are what the DFU utility uses to flash the boot loader using USB. Signed-off-by: Keith Packard

altos/stmf0: Hook up clock output support

2016-08-02T23:55:11+00:00

This was used to try and not have two xtals on telemini, but failed because the provided clock has too much noise. Signed-off-by: Keith Packard

altos: Add STM32F0 beep and SPI byte API.

2016-07-14T22:12:58+00:00

Signed-off-by: Keith Packard

Switch from GPLv2 to GPLv2+

2016-07-12T22:41:41+00:00

Signed-off-by: Keith Packard

altos/stmf0: Remove ao_usb_free

2016-06-12T05:17:01+00:00

This can't work without a lot more effort. Signed-off-by: Keith Packard

altos/stmf0: Rework the sram allocation to save a few text bytes

2016-06-12T05:16:12+00:00

Boot loaders were going over 4096 bytes of ROM. I suspect we'll need more serious work soon. Signed-off-by: Keith Packard

stmf0: Do not send more data than requested for GET_DESCRIPTOR

2016-06-10T05:06:30+00:00

When Linux boots, it asks for only the first 8 bytes of the device descriptor; we must limit the amount of data sent back to that amount or USB will get wedged. Signed-off-by: Keith Packard

stmf0: Clear all USB state when resetting chip. Wakeup all sleepers

2016-06-10T05:05:24+00:00

When USB is reset, but the board is not power cycled, all of the internal USB state needs to be reset, and any tasks blocked on sending or receiving packets need to be awoken so they can go wait for USB to start running again. Signed-off-by: Keith Packard