[参考译文] MSPM0L1306：PA18上的 MSPM0L1306 UART0 RX

/// Constructor
///
/// @param port   GPIO port struct (e.g. GPIOA)
/// @param pin    The pin number (e.g. 1 for PA1)
Gpio(GPIO_Regs* const port, const uint32_t pin)
  : M_PORT{port},
    M_PIN_INDEX{pin},
    M_PIN_MASK{static_cast<uint32_t>(1U) << pin} {
    ASSERT(pin < 32U);
}

/// Configure the pin as an digital input pin
///
/// @param function           Alternate function selection (0 ... 15)
/// @param pull               Pull resistor (see #Pull)
/// @param inversion          Input inversion (see #Inversion)
/// @param hysteresis         Input hysteresis (see #Hysteresis)
void ConfigureAsInput(const uint32_t function,
                    const Pull pull = Pull::NONE,
                    const Inversion inversion = Inversion::DISABLE,
                    const Hysteresis hysteresis = Hysteresis::TTL) {
    uint32_t reg{};
    reg |= IOMUX_PINCM_INENA_ENABLE;
    reg |= IOMUX_PINCM_PC_CONNECTED;
    reg |= static_cast<uint32_t>(function);
    reg |= static_cast<uint32_t>(pull);
    reg |= static_cast<uint32_t>(inversion);
    reg |= static_cast<uint32_t>(hysteresis);
    SetMux(reg);
}

/// Configure the pin as an digital output pin
///
/// @param function           Function selection (0 ... 15)
/// @param outputType         Output type for pin (see #OutputType)
/// @param inversion          Output inversion (see #Inversion)
void ConfigureAsOutput(const uint32_t function,
                     const OutputType outputType = OutputType::PUSH_PULL,
                     const Inversion inversion = Inversion::DISABLE) {
    uint32_t reg{};
    reg |= IOMUX_PINCM_PC_CONNECTED;
    reg |= static_cast<uint32_t>(function);
    reg |= static_cast<uint32_t>(outputType);
    reg |= static_cast<uint32_t>(inversion);
    SetMux(reg);
    EnableOutput();
}

/// Set the mux register
///
/// @param reg   The value to write to the mux register
void SetMux(const uint32_t reg) {
    IOMUX->SECCFG.PINCM[M_PIN_INDEX] = reg;
}

mcal:Common::ResetPeripheral(GPIOA);

// Enable power
mcal::Power::EnableGpioA();

// Wait 16 cycles for the power to be enabled
mcal::Common::DelayCycles(16U);

// UART Pins
mcal::Gpio uartTxPin(GPIOA, 17U);
mcal::Gpio uartRxPin(GPIOA, 18U);

// GPIO MUX Function 2 is UART
uartTxPin.ConfigureAsOutput(2U);
uartRxPin.ConfigureAsInput(2U);

/* Defines for UART_0 RX = PA9 */
#define UART_0_INST                                                        UART0
#define UART_0_INST_IRQHandler                                  UART0_IRQHandler
#define UART_0_INST_INT_IRQN                                      UART0_INT_IRQn
#define GPIO_UART_0_RX_PORT                                                GPIOA
#define GPIO_UART_0_TX_PORT                                                GPIOA
#define GPIO_UART_0_RX_PIN                                         DL_GPIO_PIN_9
#define GPIO_UART_0_TX_PIN                                         DL_GPIO_PIN_8
#define GPIO_UART_0_IOMUX_RX                                     (IOMUX_PINCM10)
#define GPIO_UART_0_IOMUX_TX                                      (IOMUX_PINCM9)
#define GPIO_UART_0_IOMUX_RX_FUNC                      IOMUX_PINCM10_PF_UART0_RX
#define GPIO_UART_0_IOMUX_TX_FUNC                       IOMUX_PINCM9_PF_UART0_TX


/* Defines for UART_0 RX = PA18*/
#define UART_0_INST                                                        UART0
#define UART_0_INST_IRQHandler                                  UART0_IRQHandler
#define UART_0_INST_INT_IRQN                                      UART0_INT_IRQn
#define GPIO_UART_0_RX_PORT                                                GPIOA
#define GPIO_UART_0_TX_PORT                                                GPIOA
#define GPIO_UART_0_RX_PIN                                        DL_GPIO_PIN_18
#define GPIO_UART_0_TX_PIN                                         DL_GPIO_PIN_8
#define GPIO_UART_0_IOMUX_RX                                     (IOMUX_PINCM19)
#define GPIO_UART_0_IOMUX_TX                                      (IOMUX_PINCM9)
#define GPIO_UART_0_IOMUX_RX_FUNC                      IOMUX_PINCM19_PF_UART0_RX
#define GPIO_UART_0_IOMUX_TX_FUNC                       IOMUX_PINCM9_PF_UART0_TX