Char nach Struct schreiben

[hermes]

Hallo,
ich habe eine Structure mit Bitfeldern

struct
{
	unsigned char bnv_on_off 	:2; // Bits 0..1
	unsigned char charge_malfunction_indicator_on_off :2; //Bits 2..3
	unsigned char acknowledge_of_voltage_demand	:2;     //Bits 4..5
	unsigned char acknowledge_of_current_demand   :2;     //Bits 6..7
}status_byte1;

Ich möchte nun eine unsigned char variable nach status_byte1 schreiben.
unsigned char x = 0x73;
status_byte1 = x;
oder
x = status_byte1;
ergibt die Fehlermeldung "illegal conversion"

Kann soetwas überhaupt Funktionieren und wenn ja wie?

Ich möchte die Syntax status_byte1.charge_malfunction_indicator_on_off = x >>2
vermeiden.

Gruß
Johann

[AJ]

Kein Problem mit einer union

union
{
   struct
   {
	unsigned char bnv_on_off 	:2; // Bits 0..1
	unsigned char charge_malfunction_indicator_on_off :2; //Bits 2..3
	unsigned char acknowledge_of_voltage_demand	:2;     //Bits 4..5
	unsigned char acknowledge_of_current_demand   :2;     //Bits 6..7
   } byte_st;
   unsigned char byte;
}status_byte1;

...

//komplettes byte beschreiben
status_byte1.byte = 0x73;

//nur einzelne bits auslesen
printf("on_off = %d", status_byte1.byte_st.bnv_on_off);

[hermes]

union
{
	struct
	{
		unsigned char bnv_on_off 	:2;
		unsigned char charge_malfunction_indicator_on_off :2;
		unsigned char acknowledge_of_voltage_demand	:2;
		unsigned char acknowledge_of_current_demand   :2;
	}bits;
	unsigned char byte;
}status_byte1;

status_byte1.byte = 0xf0;
status_byte1.bits.bnv_on_off = 1;

Funktioniert

Vielen Dank