diff options
Diffstat (limited to 'os/hal/src')
| -rw-r--r-- | os/hal/src/onewire.c | 26 |
1 files changed, 12 insertions, 14 deletions
diff --git a/os/hal/src/onewire.c b/os/hal/src/onewire.c index 0717893..825bb63 100644 --- a/os/hal/src/onewire.c +++ b/os/hal/src/onewire.c @@ -18,19 +18,19 @@ /* Main ideas: */ /*=========================================================================== -1) switch PWM output pin it opendrain mode. -2) start 2 channels simultaneously. First (master channel) generates +1) switch PWM output pin it open drain mode. +2) start 2 channels _simultaneously_. First (master channel) generates pulses (read time slots) second (sample channel) generates interrupts from where read pin function calls. -- ---------------------------------------------- master channel - | / - ---- -- ------------------------------------ sample channel - | | - ------------------ - ^ - read interrupt here +- --------------------------------------- master channel generates pulses + | / + -- +- ----------------------------- sample channel reads pad state + | | + ---------------- + ^ + | read interrupt fires here For data write it is only master channel needed. Data bit width updates on every timer overflow event. @@ -39,8 +39,6 @@ on every timer overflow event. /*===========================================================================*/ /* General recommendations for strong pull usage */ /*=========================================================================== - * - * * 1) Use separate power rail instead of strong pull up whenever possible. * Driver's strong pull up feature is very interrupt jitter sensible. * 2) Use special 1-wire bus master (DS2484 for example) if you are @@ -101,7 +99,7 @@ onewireDriver OWD1; /* Driver local variables and types. */ /*===========================================================================*/ /** - * @brief Config for fast intialization of all fields + * @brief Config for fast initialization of all fields */ static const PWMConfig pwm_default_cfg = { 1000000, @@ -837,7 +835,7 @@ size_t onewireSearchRom(onewireDriver *owp, uint8_t *result, } /* - * Included (if enabled) test code + * Include test code (if enabled). */ #if ONEWIRE_SYNTH_SEARCH_TEST #include "search_rom_synth.c" |