RE: value of uint8_t array suddenly changed and sizeof value is not correct

azwawe — Wed, 23 Nov 2022 03:28:16 GMT

Hi, thanks for responding Einar.

Anyway, I got the solution. My senior engineer told me to expand it and implement it one by one. The way to implement this array is like the code below.

int ch201_write_byte(ch201_device *dev_ptr, uint16_t mem_addr, uint8_t data_value) {
	uint8_t message[2];
	message[0] = sizeof(data_value);
	message[1] = data_value;
	int ch_err = i2c_block_write(CH201_I2C_ADDR_PROG, mem_addr, sizeof(message), message);
	return ch_err;
}

TBH, I don't know why I have to do that, but at least it works. Hehe.

Thanks.

RE: value of uint8_t array suddenly changed and sizeof value is not correct

Einar Thorsrud — Mon, 21 Nov 2022 13:11:26 GMT

Hi,

You are right, sizeof a uint8 is always 1. This could be caused by a stack overflow, some other part of the code in an interrupt for instance that overwrites and corrupts this memory, or similar. It could also be just a issue with debugging, for instance if you are debugging optimized code things might look strange. A bit more information about your code and how you debug would be needed in order to say more precisely what the cause is here.