Part Number: TMS320F28377S
Other Parts Discussed in Thread: ISO1050
Hello,
I'm having issues using can communication with the ISO1050 transciever and Launchpad XL.
The signal i see on the F28377S CANBRX pin is a 1Vpp communication signal ( attached is the image from the osciloscope with the waveform on the Rx pin from the tansciever ).
I'm using pins 33 and 34 from jumper J4 ( CANRXB and CANTXB) to communicate with the transciever. When i don't connect the transciever to the Launchpad, the waveform of the Rx pin is from 0V to 3.3V. When i connect the Tx and Rx from the ISO to the launchpad Pins, the signal drops to 1V .
Can this be a configuration issue ? Im using the typical CAN circuit ( 120R between CANL and CANH , 0,1uF Cap bypass near VCC1 and VCC2, VCC1 = 3.3V, VCC2 = 5V )
The CANB pin configuration i'm using is :
//CANB
GPIO_SetupPinMux(21, GPIO_MUX_CPU2CLA, 5); //CANRXB
GPIO_SetupPinOptions(21, GPIO_INPUT, GPIO_ASYNC);
GPIO_SetupPinMux(20, GPIO_MUX_CPU2CLA, 5); //CANTXB
GPIO_SetupPinOptions(20, GPIO_OUTPUT, GPIO_PUSHPULL);
EDIS;
Thanks.
Best Regards,
Bruno Duarte