SPI master RX problem with reception

RE: SPI master RX problem with reception

haakonsh — Thu, 26 Oct 2017 10:43:31 GMT

A nice! :)

RE: SPI master RX problem with reception

jean.oriano — Wed, 25 Oct 2017 15:34:48 GMT

My first choice because of the price. today, visual studio + gdb is about 700 €. and it's a performent IDE. I think for more complex embedded system, keil or iar are most efficient but for my entreprise application's it is more than sufficient. the second thing is that i use xamarin to developp my BLE application on android & IOS. So for 1 IDE byu and his extension, i can develop my smartphone application and my embedded program.

RE: SPI master RX problem with reception

haakonsh — Mon, 23 Oct 2017 07:56:19 GMT

Jean. I've never used GDB myself, maybe it's time to check it out^^

RE: SPI master RX problem with reception

jean.oriano — Mon, 23 Oct 2017 07:32:49 GMT

haakonsh : it's not a real time visualisation, u can update the value automaticly all the 10ms. Today, i d'ont need more. It's simple to use and no need extra installation.

RE: SPI master RX problem with reception

jean.oriano — Mon, 23 Oct 2017 07:30:56 GMT

hey MainOFF, i use VisualStudio and his extension VisualGDB. U can use spy windows to show all the variable you want. you just need to be carefull about the life cycle of the variable. For show in "real time" you need to show the live variable window. Same, be carefull about life cycle of variable. To show this windows, go to menu "debug"->"windows"->"live variables" or "debug"->"windows"->"spy"->"spy 1"

yes it's works on NRF52 :)

RE: SPI master RX problem with reception

haakonsh — Fri, 20 Oct 2017 10:49:46 GMT

For real-time debugging you need to use Segger RTT or ETM/ITM trace

RE: SPI master RX problem with reception

MainOFF — Fri, 20 Oct 2017 10:25:29 GMT

I was working with stm32 MCU. debug monitor of them very good! I can see value of variable with realtime. Can I do that with nrf52?

RE: SPI master RX problem with reception

haakonsh — Fri, 20 Oct 2017 08:10:00 GMT

You need to set a break point in the SPI event handler. The m_rx_buf should appear as a variable in the Call Stack once you hit that break point. You can also add m_rx_buf to Watch or Memory by right clicking on it.

RE: SPI master RX problem with reception

MainOFF — Fri, 20 Oct 2017 06:21:58 GMT

hey brother. How can you show value of m_rx_buf in the monitor ?

RE: SPI master RX problem with reception

haakonsh — Tue, 25 Oct 2016 09:03:34 GMT

Hey Jean,

This is a feature of the SPI protocol. SPI is a simple generic full-duplex serial protocol. There are no preamble, headers or error correction mechanisms built in. There is only a Rx buffer and a Tx buffer which is accessed one SPI word at a time, usually one byte.

For every SPI clock cycle, one bit is transmitted from the Tx buffer, and one bit is received in the Rx buffer. The HW SPI peripheral or the SPI driver does not know that while you are transmitting, for instance, a control byte followed by a couple of address bytes, you are actually not interested in what you receive, they care only that you DO receive something, even if its 0x00.

You will have to implement a method for reading the Rx buffer yourself. You can either get the data you want by directly accessing m_rx_buf[4] or[5], or you can create an array pointer and point to the address of m_rx_buf[4]. Then your data would start in element 0 of the array pointer.

Cheers, Håkon