[参考译文] LAUNCHXL-F280049C：在直流滤波器锁存器上强制设置 C2000驱动程序库 CMPSSn 异步路径

https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1479987/launchxl-f280049c-c2000-driver-lib-cmpssn-async-path-is-forced-on-dc-filter-latch

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如本文所述、用于设置 CMPCTL 寄存器位的驱动程序库调用中存在一个错误。 这种异常基本上会将带有数字滤波器 CTRIPH 和 CTRIPL 的 COMPH/L 输出推入或门、而 COMPCTL 输出所选的控件。

从表面上看、图16-1显示了异步路径是一个单独的寄存器控制寄存器位状态、例如位14 (ASYNCLEN)和位6 (ASYNCHEN)。

针对 CMPCTL 寄存器位的快速处理会修改如下所示的调用、以控制 位14 ASYNCLEN 和6 ASYNCHEN。  从表面上看、这需要添加单独的新函数(cmpss.h)来以更高的精度控制数字滤波器。 当前 cmpss.h 库调用 C2000Ware 5.04及更低版本的一个意外异常；COMP_H/L 状态寄存器不会响应进入 EPWM_Xbar CMPSS MUX0.0表9-2的数字滤波器输出状态的软件复位调用。

除了通过 SYSCLK 重置斜坡发生器之外、在异步路径之后使用数字滤波器 OR'D'(图16-1 CMPSS 方框图)的原因是什么？  

 当为锁存或不锁存滤波器状态选择数字滤波器时、以下解决方法可校正与 COMPH 或 COMPL 输出(ASYNC 路径)进行"或"运算的数字滤波器输出锁存状态到 ePWM XBAR MUX0.0。

//*****************************************************************************
//
//! Sets the output signal configuration for the high comparator.
//!
//! \param base is the base address of the CMPSS module.
//! \param config is the configuration of the high comparator output signals.
//!
//! This function configures a comparator's output signals CTRIP and CTRIPOUT.
//! The \e config parameter is the result of a logical OR operation between the
//! \b CMPSS_TRIPOUT_xxx and \b CMPSS_TRIP_xxx values.
//!
//! The \b CMPSS_TRIPOUT_xxx term can take on the following values to specify
//! which signal drives CTRIPOUTH:
//! - \b CMPSS_TRIPOUT_ASYNC_COMP - The asynchronous comparator output.
//! - \b CMPSS_TRIPOUT_SYNC_COMP - The synchronous comparator output.
//! - \b CMPSS_TRIPOUT_FILTER - The output of the digital filter.
//! - \b CMPSS_TRIPOUT_LATCH - The latched output of the digital filter.
//!
//! The \b CMPSS_TRIP_xxx term can take on the following values to specify
//! which signal drives CTRIPH:
//! - \b CMPSS_TRIP_ASYNC_COMP - The asynchronous comparator output.
//! - \b CMPSS_TRIP_SYNC_COMP - The synchronous comparator output.
//! - \b CMPSS_TRIP_FILTER - The output of the digital filter.
//! - \b CMPSS_TRIP_LATCH - The latched output of the digital filter.
//!
//! \return None.
//
//*****************************************************************************
static inline void
CMPSS_configOutputsHigh(uint32_t base, uint16_t config)
{
    //
    // Check the arguments.
    //
    ASSERT(CMPSS_isBaseValid(base));

    //
    // Write the high comparator output settings to the appropriate register.
    //
    EALLOW;

    HWREGH(base + CMPSS_O_COMPCTL) = (HWREGH(base + CMPSS_O_COMPCTL) &
                                      ~(CMPSS_COMPCTL_CTRIPOUTHSEL_M |
                                         CMPSS_COMPCTL_CTRIPHSEL_M |
                                          CMPSS_COMPCTL_ASYNCHEN)) |
                                     config;

    EDIS;
}

//*****************************************************************************
//
//! Sets the output signal configuration for the low comparator.
//!
//! \param base is the base address of the CMPSS module.
//! \param config is the configuration of the low comparator output signals.
//!
//! This function configures a comparator's output signals CTRIP and CTRIPOUT.
//! The \e config parameter is the result of a logical OR operation between the
//! \b CMPSS_TRIPOUT_xxx and \b CMPSS_TRIP_xxx values.
//!
//! The \b CMPSS_TRIPOUT_xxx term can take on the following values to specify
//! which signal drives CTRIPOUTL:
//! - \b CMPSS_TRIPOUT_ASYNC_COMP - OR The asynchronous comparator output.
//! - \b CMPSS_TRIPOUT_SYNC_COMP - The synchronous comparator output.
//! - \b CMPSS_TRIPOUT_FILTER - The output of the digital filter.
//! - \b CMPSS_TRIPOUT_LATCH - The latched output of the digital filter.
//!
//! The \b CMPSS_TRIP_xxx term can take on the following values to specify
//! which signal drives CTRIPL:
//! - \b CMPSS_TRIP_ASYNC_COMP - OR The asynchronous comparator output.
//! - \b CMPSS_TRIP_SYNC_COMP - The synchronous comparator output.
//! - \b CMPSS_TRIP_FILTER - The output of the digital filter.
//! - \b CMPSS_TRIP_LATCH - The latched output of the digital filter.
//!
//! \return None.
//
//*****************************************************************************
static inline void
CMPSS_configOutputsLow(uint32_t base, uint16_t config)
{
    //
    // Check the arguments.
    //
    ASSERT(CMPSS_isBaseValid(base));

    //
    // Write the low comparator output settings to the appropriate register.
    //
    EALLOW;

    HWREGH(base + CMPSS_O_COMPCTL) = (HWREGH(base + CMPSS_O_COMPCTL) &
                                      ~(CMPSS_COMPCTL_CTRIPOUTLSEL_M |
                                         CMPSS_COMPCTL_CTRIPLSEL_M |
                                          CMPSS_COMPCTL_ASYNCLEN)) |
                                     (config << 8U);

    EDIS;
}