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techfreak
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techfreak
Asked: July 30, 2022In:
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Just got the EK-RA4M2. Downloaded example code from here (EK-RA4M2 – Evaluation Kit for RA4M2 MCU Group | Renesas). Connected 1) RXD MISO P410 ——-> TXD Pin of USB-UART 2) TXD MOSI P411 ——-> RXD Pin of USB-UART 3) Common GND as ...Read more

Just got the EK-RA4M2. Downloaded example code from here (EK-RA4M2 – Evaluation Kit for RA4M2 MCU Group | Renesas). Connected

1) RXD MISO P410 ——-> TXD Pin of USB-UART
2) TXD MOSI P411 ——-> RXD Pin of USB-UART
3) Common GND

as readme.txt.

However, there is no serial activity. any suggestions?

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EK-RA4M2renesassciSCI_UARTuart
  1. dev krishnan

    The pins P410, P411 are connected to the SCI0, and pins P601, P602 are connected to the SCI9. Have you changed the channel number in the UART stack like this? Also make sure that the Rx/Tx pins have both CMOS output type:

    The pins P410, P411 are connected to the SCI0, and pins P601, P602 are connected to the SCI9. Have you changed the channel number in the UART stack like this?

    Also make sure that the Rx/Tx pins have both CMOS output type:

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Anonymous
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Anonymous
Asked: July 28, 2022In:
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 I wanted to clarify the difference between using the SCI module’s SPI pins as opposed to using the SPI pins that aren’t within the SCI module. I was wondering if you could explain why one would choose to use either ...Read more

 I wanted to clarify the difference between using the SCI module’s SPI pins as opposed to using the SPI pins that aren’t within the SCI module. I was wondering if you could explain why one would choose to use either the SPI inside of the SCI module, or use the independent SPI and some design considerations that would be included in making that decision. One more point of confusion for me was why there are pins dedicated to slave selection for SPI communication. To my understanding (which is quite limited), generally with other microcontrollers, you may use a simple GPIO as a slave selection pin, I was wondering if Renesas microcontrollers also had this option or if you have to use the slave selection pins given by the datasheet of the microcontroller.

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gpioscispi
  1. pallavi sharma

    The SCI supports a so-called "Simple SPI" mode that has far less capability than the std SPI peripheral.  From the hardware U/M: If your application requirements can be met by the Simple-SPI then it could be used.

    The SCI supports a so-called “Simple SPI” mode that has far less capability than the std SPI peripheral.  From the hardware U/M:

    If your application requirements can be met by the Simple-SPI then it could be used.

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vsharma
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vsharma
Asked: July 12, 2022In:
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In Renesas RA4M3 with an SCI SPI setup, we have MOSI rising up to 3.7 V instead of 3.3V. After verifying that all input voltage to the processor is 3.3V and testing it with nothing connected to the SCI SPI ...Read more

In Renesas RA4M3 with an SCI SPI setup, we have MOSI rising up to 3.7 V instead of 3.3V. After verifying that all input voltage to the processor is 3.3V and testing it with nothing connected to the SCI SPI as well we could not find reason for MOSI rising up to 3.7V.

Any insight on why this happens?

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mosira4m3renesasscispi
  1. pallavi sharma

    It seems that the motor driver board is sourcing voltage and current into the EVK. 

    It seems that the motor driver board is sourcing voltage and current into the EVK. 

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