error: invalid conversion from 'char*' to 'uint32_t

Question

I am trying to manually set up a RTC clock. When doen automatically, this is the working code:

clock.setDateTime((__DATE__, __TIME__));

But now I want to set it manually and this is what I am trying:

char dateTime[20];
strcat(dateTime, "2017,03,22,16,20,04");
//clock.setDateTime((__DATE__, __TIME__));
clock.setDateTime(dateTime);

I get the following error(at the last line):

error: invalid conversion from 'char*' to 'uint32_t {aka long unsigned int}' [-fpermissive]

How to solve?

EDIT: This is how setDateTime is defined:

void setDateTime(uint16_t year, uint8_t month, uint8_t day, uint8_t hour, uint8_t minute, uint8_t second);

Okay. So you need to split the string into parameters that match how `setDateTime` is defined. — NathanOliver, Mar 22 '17 at 15:26
You're feeding a string (`char *`) to a function that expects integer parameters... that's an invalid conversion (as the compiler is telling you). What do you expect? — DevSolar, Mar 22 '17 at 15:28
Also, I guess there are multiple declarations for `setDateTime()`, as 1) the one you're showing us shouldn't work with `(__DATE__, __TIME__)` either, and 2) the one you're showing us is not expecting `uint32_t` which is what the compiler complains about. — DevSolar, Mar 22 '17 at 15:34
Why screw around with strings if you could just call `clock.setDateTime(2017,3,22,16,20,4)`? — gre_gor, Mar 22 '17 at 15:40

score 2 · Answer 1 · edited Jun 20 '20 at 09:12

setDateTime() takes the date as a succession of integers:

setDateTime(year, month, day, hours, minutes, seconds);

Bonus: according to man strcat:

char *strcat(char *dest, const char *src);
Description

The strcat() function appends the src string to the dest string, ...

Since you use it this way:

char dateTime[20];
strcat(dateTime, "2017,03,22,16,20,04");

you append "2017,03,22,16,20,04" to unitialized memory, which is undefined behaviour.

score 1 · Accepted Answer · answered Mar 22 '17 at 15:44

1

setDateTime() accepts ints as parameters, yet you give it char array.

The call should be:

clock.setDataTime(2017, 3, 22, 16, 20, 4);

answered Mar 22 '17 at 15:44

zhm

2 Answers2