MSP430f5529lp ADC doesn't work

Ekaterina Shyshchenko said:

I am using ccs example project "MSP430F55xx_adc_01.c" where a single sample is made on channel A0 .

From which version of MSP430Ware? What device are you using?

This example is designed for a MSP430F552x device. It may require some tweaking to work with other 5xx devices.

Ekaterina Shyshchenko said:

The problem is that the register ADC12SC (start conversion) always set to zero, though the following command is set:

ADC12CTL0 |= ADC12SC

I'm sure you meant that the bit ADC12SC is always clear, since there is no register named ADC12SC. Regardless, Table 28-4 in the User's Guide states that this bit is reset automatically after being set. So you should not presume to be able to ever read back that bit being set.

Ekaterina Shyshchenko said:

Also, when I gave 3.3V with 5 Ohm resistor to A0, the MSP430 rebooted.

Not sure about this, especially without know what the target device and board are. What is AVcc connected to? The example doesn't set any bits for reference voltage, so if you have a device with REF module, you may need to make some changes.

I am using MSP -EXP430F5529lp if to be more specific...

And yes,I have meant a bit ADC12SC, ( at the ADC12CTL0 register).

I have tried to play with the references at ADC10MCTL0 Register. I have set a Vref+ as Avcc

But still, I can't read any sample from ADC12MEM0, it's always clear, even with the example at ccs.

Ekaterina Shyshchenko said:

The problem is that the register ADC12SC (start conversion) always set to zero

When looking at it with a debugger (e.g. single-stepping), the ADC has done the conversion long before the debugger reads the register. And the bit has been cleared again. The debugger only stops the CPU but not the ADC.

Ekaterina Shyshchenko said:

Also, when I gave 3.3V with 5 Ohm resistor to A0, the MSP430 rebooted.