dynamic char array sizing
- by droseman
Hello,
In my application, I have a char array defined which can take one of three options: "okay", "high", "low" which are then sent down a serial port to a remote device. I currently have the array sized to take the 4 character words plus carriage return and line feed, but when I have to send "low" I get a null character in the strings, which I am concerned would confuse the host terminal.
array definition
char mod1_status_char[6] = {'0','0','0','0','0','0'};
char mod2_status_char[6] = {'0','0','0','0','0','0'};
char mod3_status_char[6] = {'0','0','0','0','0','0'};
sample of switch case statement:
void DCOKStatus(uint8_t *ptr_status)
{
uint8_t status = *ptr_status;
switch (status)
{
case 0x00:
strcpy(mod1_status_char, "okay");
strcpy(mod2_status_char, "okay");
strcpy(mod3_status_char, "okay");
break;
case 0x10:
strcpy(mod1_status_char, "okay");
strcpy(mod2_status_char, "okay");
strcpy(mod3_status_char, "low");
break;
}
This is the struct which makes the message string to send
strcpy(MsgStatus_on.descriptor_msg, "$psu_");
MsgStatus_on.address01 = hex_addr[0];
MsgStatus_on.address02 = hex_addr[1];
MsgStatus_on.space01 = 0x20;
strcpy(MsgStatus_on.cmdmsg01, "op_en op1_");
strcpy(MsgStatus_on.statusmsg01, mod1_status_char);
MsgStatus_on.space02 = 0x20;
strcpy(MsgStatus_on.cmdmsg02, "op2_");
strcpy(MsgStatus_on.statusmsg02, mod2_status_char);
MsgStatus_on.space03 = 0x20;
strcpy(MsgStatus_on.cmdmsg03, "op3_");
strcpy(MsgStatus_on.statusmsg03, mod3_status_char);
MsgStatus_on.CR = 0x0D;
MsgStatus_on.LF = 0x0A;
and this sends the message
void USARTWrite(char *object, uint32_t size)
{
GPIO_SetBits(GPIOB, GPIO_Pin_1);
char *byte;
for (byte = object; size--; ++byte)
{
USART_SendData(USART1,*byte);
}
Would anyone be able to suggest a good approach to dynamically size the array to one character shorter when I need to send "low"?
Thanks
