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  • Case ID: 104519
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Pull up or down resistor SPI

valdev

Hello, I am doing some dev on the NRF51822 with a Cortex MO manager. I have trouble on the MISO pin, and I am wondering if I have to drive this MISO pin by any kind of pull up or down resistor. Thanks for you help

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    Thanks for your answer. It s true I should describe a little bit more my dev

    I am using the spi_master_example_with_slave_main main.c example from Nordic. I did some changes in order to avoid the error transfert and to send my own sequence several times. When I trig all the pins I get my clock cycles (3.3 Vpp) I expect, the CS is good (3.3V and 0V), I get an answer from my slave. On the MOSI pin I have a signal looks likes my clock with a 500mV pic pic and not my sequence!

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    Thanks for your answer. It s true I should describe a little bit more my dev

    I am using the spi_master_example_with_slave_main main.c example from Nordic. I did some changes in order to avoid the error transfert and to send my own sequence several times. When I trig all the pins I get my clock cycles (3.3 Vpp) I expect, the CS is good (3.3V and 0V), I get an answer from my slave. On the MOSI pin I have a signal looks likes my clock with a 500mV pic pic and not my sequence!

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