mjb/altos/src/stm/ao_usb_stm.c, branch tmgps

altos: Make CDC ACM 'line coding' public

2017-05-05T05:10:36+00:00

This allows other systems to see what baud rate the host has requested. Signed-off-by: Keith Packard

altos/stm: Allow use basepri instead of primask for masking interrupts

2017-02-20T20:32:50+00:00

This allows for high priority interrupts (priority 0) to run, even when other interrupts are blocked. Code executing in such interrupt handlers must not attempt to control task execution as that will race with the scheduler. Select this by defining AO_NONMASK_INTERRUPT in ao_pins.h. non-maskable interrupt priority is AO_STM_NVIC_NONMASK_PRIORITY Signed-off-by: Keith Packard

altos/stm: Interrupt priority is in the upper bits of the priority mask

2017-02-20T20:31:16+00:00

Because the STM32L only offers 16 priority levels, the bottom four bits of each priority mask are not used. All of the interrupt priority settings in the system were using values < 16, making them all effectively the same. Fix that by moving them into the upper 4 bits and using symbolic constants everywhere. Signed-off-by: Keith Packard

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

2016-12-18T05:04:33+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/stm: Make ao_usb_set_address static. Saves a bunch of text space

2016-12-13T00:44:47+00:00

I'm sure this makes the function end up in-lined, which saves enough text space to fit the flash loader in ROM again. Signed-off-by: Keith Packard

Switch from GPLv2 to GPLv2+

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

Signed-off-by: Keith Packard

altos/stm: Handle USB reset in STM32L usb driver

2016-06-10T21:39:25+00:00

Just like lpc and stmf0, deal with the host resetting the bus while rebooting by restoring all usb-related data to the initial values. Signed-off-by: Keith Packard

altos: Expose ao_usb_running globally

2014-02-18T17:44:52+00:00

This lets other bits of the code know when USB has been connected. Signed-off-by: Keith Packard

altos: Clean up some minor warnings from -Wall

2013-12-21T06:19:35+00:00

Unused variables, functions and labels, missing enums in switch. Signed-off-by: Keith Packard

altos/stm: Semantic error in STM usb disable caused it to not work

2013-12-19T02:20:55+00:00

The USB enable register wasn't actually getting rewritten with the enable bit turned off, so the USB device was still powered on in flight. Signed-off-by: Keith Packard