マイコンのレジスタをよくあるdefine文以外の方法でレジスタの設定するコードのイメージ。

reg_concept.c

    typedef struct {
        const struct {
            uint32_t CTSEN;
            uint32_t RTSEN;
            uint32_t RTS;
            uint32_t DTR;
            uint32_t RXE;
            uint32_t TXE;
            uint32_t LBE;
            uint32_t SIRLP;
            uint32_t SIREN;
            uint32_t UARTEN;
        } CR;
    } uart_bit_t;

    const uart_bit_t u = {
        .CR = {
            .CTSEN = 1 << 15,
            .RTSEN = 1 << 14,
            .RTS = 1 << 11,
            .DTR = 1 << 10,
            .RXE = 1 << 9,
            .TXE = 1 << 8,
            .LBE = 1 << 7,
            .SIRLP = 1 << 2,
            .SIREN = 1 << 1,
            .UARTEN = 1 << 0,
        }
    };
    
    *UART_CR = u.CR.UARTEN | u.CR.TXE | u.CR.RXE;