mjb/altos/src/stmf0/stm32f0.h, branch pong

altos/stmf0: Fix HSI clock rate.

2017-04-28T07:04:33+00:00

It's 8MHz, not 16MHz Signed-off-by: Keith Packard

altos/stmf0: Support timer 2/3 for the beeper

2017-02-21T01:35:51+00:00

Tested on timer 2, all four channels. 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/stmf0: Add USART support

2016-10-31T02:07:39+00:00

The STM32F0 usart can be operated much like the STM32L usart, but the registers are all moved around. 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: Fix external interrupts

2016-04-20T03:21:30+00:00

Missing a reserved address in the registers broke everything nicely, but the priority values were also wrong - stm32f0 exposes 8 bits per priority, like the stm32l, but it uses only the top two bits. Signed-off-by: Keith Packard

altos/stmf0: Support HPE clock source

2016-04-03T02:45:06+00:00

Allows the use of crystals instead of requiring USB. Signed-off-by: Keith Packard

altos/stmf0: Add SPI driver.

2016-04-03T02:45:06+00:00

This also changes the DMA interface a bit so we can select for interrupts on only the interesting channels. Signed-off-by: Keith Packard