Serial communication between CC2541 and MSP430

liunengjian

Serial communication between CC2541 and MSP430 [Copy link]

 

CC2541 and MSP430 communicate via serial port. The levels of CC2541 TX and MSP430 RX are reversed. The communication is not normal. How to solve this problem? I am connecting directly. Do I need to convert the level in the middle?

iushiyuan

Check whether the voltages of the two ICs are consistent. If they are, there is no need to convert them.

chunyang

The electrical level is reversed? Impossible. How did you come to this conclusion? The serial port of CC2541 is the 51 serial port on the chip, which is standard. If the electrical level is different, it can be converted, but incompatible electrical levels are different from reverse electrical levels.

懒猫爱飞

It's probably a programming problem.

liunengjian

iushiyuan posted on 2019-2-14 17:52 Check if the voltages of these two ICs are consistent. If they are the same, there is no need to add conversion.

They are from the same power supply

liunengjian

chunyang posted on 2019-2-14 18:05 Is the level reversed? Impossible. How did you come to this conclusion? The serial port of CC2541 is the 51 serial port in the chip, which is standard. If the level is different, you can convert...

Two are connected to UCA1 of 430, one of which is the serial port of CC2541

liunengjian

Lazy Cat Loves Flying posted on 2019-2-15 08:24 It should be a program problem

I connected two ports to UCA1 of 430, one of which is the serial port of CC2541, and one of them is correct, and the RX and TX levels of CC2541 are exactly opposite

liunengjian

chunyang posted on 2019-2-14 18:05 Is the level reversed? Impossible. How did you come to this conclusion? The serial port of CC2541 is the 51 serial port in the chip, which is standard. If the level is different, you can convert...

I connected 2 UCA1 of 430, one of which is the serial port of CC2541

liunengjian

chunyang posted on 2019-2-14 18:05 Is the level reversed? Impossible. How did you come to this conclusion? The serial port of CC2541 is the 51 serial port inside the chip, which is standard. If the level is different, you can convert...

I connected two ports to UCA1 of 430, one of which is the serial port of CC2541, and one is correct. The correct one is exactly the opposite of the RX and TX levels of CC2541.

liunengjian

I connected two ports to UCA1 of 430, one of which is the serial port of CC2541. One of them is correct, and the RX and TX levels of CC2541 are exactly opposite.

liunengjian

Lazy Cat Loves Flying posted on 2019-2-15 08:24 It should be a program problem

I connected two ports to UCA1 of 430, one of which is the serial port of CC2541, and one of them is correct, and the RX and TX levels of CC2541 are exactly opposite

liunengjian

I connected two ports to UCA1 of 430, one of which is the serial port of CC2541. One of them is correct, and the RX and TX levels of CC2541 are exactly opposite.

chunyang

Give a specific circuit.

常见泽1

CC2541 serial port TX connected to 430 RX cc2541 voltage [attach] 402127 [/attach]

alan000345

常常泽1 Published on 2019-2-16 09:03 CC2541 serial port TX connected to 430 RX cc2541 voltage

It is given by an expert, it is really detailed.

zhuyebb

The voltage level is reversed? Impossible

alan000345

zhuyebb posted on 2019-2-18 16:31 Is the voltage level reversed? Impossible

Yes, it is probably because of the design problem of the chip's peripheral circuit.

tiankai001

The electrical levels are reversed, which is impossible. In addition, according to the electrical levels of CC2541 given on the 14th floor, it means that the two can be directly connected without level conversion.

youganw

I suggest you check if it's a level incompatibility issue.

alan000345

Did you solve the problem in the end?