How to transmit 20 bits at once over SPI using nRF5 SDK

RE: How to transmit 20 bits at once over SPI using nRF5 SDK

karthikeyan — Thu, 22 Feb 2018 05:21:52 GMT

hi,

yes this will work. but this will not represent 20 bit. it will be 24 bit.

RE: How to transmit 20 bits at once over SPI using nRF5 SDK

Jan Lundskov — Wed, 21 Feb 2018 06:24:16 GMT

Thanks for your reply. So will it be possible to do it in this way?

static uint8_t m_tx_buf[3]

m_tx_buf[] = {0xD0, 0x50, 0x05};

RE: How to transmit 20 bits at once over SPI using nRF5 SDK

Turbo J — Tue, 20 Feb 2018 17:37:55 GMT

m_tx_buf[0] =  0xD0505;   // 20 bit value to be transmitted

This code tries to put 20 bits into a variable that holds just 8. Please read some basic literature about the "C" programming language, this 40+ year old beast is not self-explanatory at all. Oh, you also want to turn on compiler warnings.