mjb/altos/src/stm/ao_arch_funcs.h, branch pong

stm: Add more mask-based GPIO controls

2017-04-04T23:04:25+00:00

Lets cortexelf do more things with groups of pins, rather than one pin at a time. Signed-off-by: Keith Packard

stm: Add a few more GPIO functions to make dealing with the 1802 easier

2017-04-03T18:37:21+00:00

ao_gpio_set_mask and ao_gpio_get_all Signed-off-by: Keith Packard

altos: add button matrix driver

2017-04-03T02:30:57+00:00

Scans the matrix once per clock tick queuing events for changed keys. 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/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_spi_duplex out pointer const

2016-09-03T05:58:39+00:00

Provides a bit better typechecking opportunities for this function. Signed-off-by: Keith Packard

Switch from GPLv2 to GPLv2+

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

Signed-off-by: Keith Packard

altos/stm: Add better byte-level SPI api

2016-06-30T02:17:45+00:00

This provides inline functions for sending and receiving individual bytes, and setup/finish functions to wrap them in. This make the byte sending respect the SPI hardware interface requirements. Signed-off-by: Keith Packard

altos/stm: Change ao_spi_send_sync definition to take const source

2016-06-30T02:17:45+00:00

Provides for a bit better error checking. Signed-off-by: Keith Packard

altos/stm: remove ao_dma_abort

2016-06-30T02:17:45+00:00

This function isn't used anywhere. Signed-off-by: Keith Packard