ESP32 Forum

Posted: **Sun Mar 01, 2020 9:14 am**

simply add #include "driver/pcnt.h" in my Project

causes two Compiler-Problems in "hal/pcnt_ll.h" line 48 and in line 60 (see Code below)

C:/Users/.../esp_idf_Tools_V2_2/components/soc/src/esp32/include/hal/pcnt_ll.h:48:71: error: cannot bind rvalue reference of type 'pcnt_dev_s::<unnamed struct>::<unnamed union>&&' to lvalue of type 'volatile pcnt_dev_s::<unnamed struct>::<unnamed

I cannot see why the Compiler does not understand this original espressif Code
- seems to be a Compiler Bug: - Looks like he regards the struct as CONST

I have also added my BugFix

I am using the latest Eclipse-plugin, Installed 4 Days ago
- Espressif IDF Plugins for Eclipse 1.0.0.202002201116 com.espressif.idf.feature.feature.group ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD

Code: Untitled.cpp Select all


/**

 * @brief Set PCNT counter mode

 *

 * @param hw Peripheral PCNT hardware instance address.

 * @param unit PCNT unit number

 * @param channel PCNT channel number

 * @param pos_mode Counter mode when detecting positive edge

 * @param neg_mode Counter mode when detecting negative edge

 * @param hctrl_mode Counter mode when control signal is high level

 * @param lctrl_mode Counter mode when control signal is low level

 */

static inline void pcnt_ll_set_mode(pcnt_dev_t *hw, pcnt_unit_t unit, pcnt_channel_t channel, pcnt_count_mode_t pos_mode, pcnt_count_mode_t neg_mode, pcnt_ctrl_mode_t hctrl_mode, pcnt_ctrl_mode_t lctrl_mode)

{

//    typeof(hw->conf_unit[unit].conf0) conf0_reg = hw->conf_unit[unit].conf0; //C:/Users/.../esp_idf_Tools_V2_2/components/soc/src/esp32/include/hal/pcnt_ll.h:48:71: error: cannot bind rvalue reference of type 'pcnt_dev_s::<unnamed struct>::<unnamed union>&&' to lvalue of type 'volatile pcnt_dev_s::<unnamed struct>::<unnamed union>'

//    if (channel == 0) {

//        conf0_reg.ch0_pos_mode = pos_mode;

//        conf0_reg.ch0_neg_mode = neg_mode;

//        conf0_reg.ch0_hctrl_mode = hctrl_mode;

//        conf0_reg.ch0_lctrl_mode = lctrl_mode;

//    } else {

//        conf0_reg.ch1_pos_mode = pos_mode;

//        conf0_reg.ch1_neg_mode = neg_mode;

//        conf0_reg.ch1_hctrl_mode = hctrl_mode;

//        conf0_reg.ch1_lctrl_mode = lctrl_mode;

//    }

//    hw->conf_unit[unit].conf0 = conf0_reg; //C:/Users/.../esp_idf_Tools_V2_2/components/soc/src/esp32/include/hal/pcnt_ll.h:60:33: error: cannot bind rvalue reference of type 'pcnt_dev_s::<unnamed struct>::<unnamed union>&&' to lvalue of type 'volatile pcnt_dev_s::<unnamed struct>::<unnamed union>'



//My Bugfix for the moment

    typeof(hw->conf_unit[unit].conf0)* lConf0RegPtr = &hw->conf_unit[unit].conf0;

    if (channel == 0) {

    	lConf0RegPtr->ch0_pos_mode = pos_mode;

    	lConf0RegPtr->ch0_neg_mode = neg_mode;

    	lConf0RegPtr->ch0_hctrl_mode = hctrl_mode;

    	lConf0RegPtr->ch0_lctrl_mode = lctrl_mode;

    } else {

    	lConf0RegPtr->ch1_pos_mode = pos_mode;

    	lConf0RegPtr->ch1_neg_mode = neg_mode;

    	lConf0RegPtr->ch1_hctrl_mode = hctrl_mode;

    	lConf0RegPtr->ch1_lctrl_mode = lctrl_mode;

    }

}

with PCNT

Posted: **Mon Mar 02, 2020 12:14 am**

Hi ESPI,

Thanks for reporting this. Is your project written in C++ or C?

I believe this isn't a compiler bug, it looks like this code is valid C but not valid C++ because of the type conversion - so currently you can't include this header into a .cpp file without getting errors like the above.

Will fix ASAP.

Posted: **Mon Mar 02, 2020 7:39 am**

Hi ESP_Angus

the Header is included via "driver/pcnt.h" and "pcnt_hal.h" from an .CPP file

the other aproach could be to avoid this inline in this Header File
--> Code moves from Header into a .c File

ESP32 Forum

compiler bug, occures in "hal/pcnt_ll.h" - Expresion regarded as CONST ?

compiler bug, occures in "hal/pcnt_ll.h" - Expresion regarded as CONST ?

Re: compiler bug, occures in "hal/pcnt_ll.h" - Expresion regarded as CONST ?

Re: compiler bug, occures in "hal/pcnt_ll.h" - Expresion regarded as CONST ?