82. Structures-i

Question.4

A developer models a UART status register using bitfields:

typedef struct {
   uint8_t RX_Ready : 1;  // bit 0
   uint8_t TX_Ready : 1;  // bit 1
   uint8_t Error    : 1;  // bit 2
   uint8_t Reserved : 5;  // bits 3-7
} UART_Status;

UART_Status *st = (UART_Status *)&status_reg;

If the hardware status register reads 0x05 (00000101), what are the values of st->RX_Ready, st->TX_Ready and st->Error?

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RX_Ready=1, TX_Ready=0, Error=1
RX_Ready=1, TX_Ready=1, Error=0
RX_Ready=0, TX_Ready=1, Error=0
RX_Ready=1, TX_Ready=0, Error=0