cpu/stm32/include/periph/f7: add missing ADC_DEVS [backport 2022.04]

[fabian18]

Backport of #17923

Contribution description

#define ADC_DEVS was missing for stm32f7xxxx. All have 3 ADC units.

Testing procedure

BOARD=nucleo-f767zi make -C tests/pkg_mbedtls flash term crashes on master branch.

ADC3 is used in periph_conf.h.

static const adc_conf_t adc_config[] = {
    {GPIO_PIN(PORT_A, 3), 2, 3},
    {GPIO_PIN(PORT_C, 0), 2, 10},
    {GPIO_PIN(PORT_C, 3), 2, 13},
    {GPIO_PIN(PORT_F, 3), 2, 9},
    {GPIO_PIN(PORT_F, 5), 2, 15},
    {GPIO_PIN(PORT_F, 10), 2, 8},
    {GPIO_UNDEF, 0, 18}, /* VBAT */
};

Locks for every ADCx are defined in adc_f4_f7.c.

static mutex_t locks[] = {
#if ADC_DEVS > 1
    MUTEX_INIT,
#endif
#if ADC_DEVS > 2
    MUTEX_INIT,
#endif
    MUTEX_INIT
};

When prep() in adc_f4_f7.c tries to lock the mutex at locks[2], illegal memory is accessed.

Using this PR, it runs successful. (tests/pkg_mbedtls uses ADC noise as entropy source.)

Welcome to pyterm!
Type '/exit' to exit.
s
2022-04-12 22:36:42,424 # START
2022-04-12 22:36:42,429 # main(): This is RIOT! (Version: 2022.07-devel-3-gc89f6b)
2022-04-12 22:36:42,430 # mbedtls test
2022-04-12 22:36:42,430 # 
2022-04-12 22:36:42,433 #   SHA-224 test #1: passed
2022-04-12 22:36:42,435 #   SHA-224 test #2: passed
2022-04-12 22:36:43,137 #   SHA-224 test #3: passed
2022-04-12 22:36:43,139 #   SHA-256 test #1: passed
2022-04-12 22:36:43,142 #   SHA-256 test #2: passed
2022-04-12 22:36:43,844 #   SHA-256 test #3: passed
2022-04-12 22:36:43,845 # 
2022-04-12 22:36:43,847 # adc_noise_single_entropy: 0
2022-04-12 22:36:43,855 #   ENTROPY test: passed
2022-04-12 22:36:43,856 # 
2022-04-12 22:36:43,943 # { "threads": [{ "name": "main", "stack_size": 2048, "stack_used": 1536 }]}

Issues/PRs references

[kfessel]

the murdoc failure is unrelated see #17928
https://ci.riot-os.org/RIOT-OS/RIOT/17926/1b00ec01fe196bd837982d41763b22c2499863b1/output/compile/tests/pbkdf2/microbit:gnu.txt

complete report:
https://ci.riot-os.org/RIOT-OS/RIOT/17926/1b00ec01fe196bd837982d41763b22c2499863b1/output.html

on accept the ci compile tests can be skipped

[benpicco]

Needs a rebase because of the branch protection

[maribu]

ping :)

[benpicco]

With the next release just around the corner, I guess this does not matter much anymore

[chrysn]

Closing as it was apparently not merged into the 2022.04 branch and has become obsolete.