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fix bug in sm_config_set_in_pin_count (#1880)

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* fix bug in sm_config_set_in_pin_count

* comment updates
This commit is contained in:
Graham Sanderson 2024-08-29 11:17:06 -05:00 • committed by GitHub
parent 2d60604b6e
commit 91864a0d6e
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1 changed files with 15 additions and 2 deletions
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17
src/rp2_common/hardware_pio/include/hardware/pio.h
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@ -382,6 +382,19 @@ static inline void sm_config_set_in_pins(pio_sm_config *c, uint in_base) {
sm_config_set_in_pin_base(c, in_base);
}
/*! \brief Set the count of 'in' pins in a state machine configuration
* \ingroup sm_config
*
* When reading pins using the IN pin mapping, this many (low) bits will be read, with the rest taking
* the value zero.
*
* \if rp2040_specific
* RP2040 does not have the ability to mask unused input pins, so the in_count must be 32
* \endif
*
* \param c Pointer to the configuration structure to modify
* \param in_count 1-32 The number of pins to include when reading via the IN pin mapping
*/
static inline void sm_config_set_in_pin_count(pio_sm_config *c, uint in_count) {
#if PICO_PIO_VERSION == 0
// can't be changed from 32 on PIO v0
@ -390,7 +403,7 @@ static inline void sm_config_set_in_pin_count(pio_sm_config *c, uint in_count) {
#else
valid_params_if(HARDWARE_PIO, in_count && in_count <= 32);
c->shiftctrl = (c->shiftctrl & ~PIO_SM0_SHIFTCTRL_IN_COUNT_BITS) |
((in_count - 1) << PIO_SM0_SHIFTCTRL_IN_COUNT_LSB);
((in_count & 0x1fu) << PIO_SM0_SHIFTCTRL_IN_COUNT_LSB);
#endif
}
@ -634,7 +647,7 @@ static inline void sm_config_set_mov_status(pio_sm_config *c, enum pio_mov_statu
* --------|--------
* Out Pins | 32 starting at 0
* Set Pins | 0 starting at 0
* In Pins (base) | 0
* In Pins | 32 starting at 0
* Side Set Pins (base) | 0
* Side Set | disabled
* Wrap | wrap=31, wrap_to=0