Hi, So I’m trying to get the hardware SPI up and running on my Particle Photon. (frirmware 4.9) And the instructions explains this fairly well. I do lack some good examples. At some places on the net it says the SPI bus goes max on 10Mhz, the manual says 60 and so on. I have the following setup: …

Thanks for the information! I will not port, so DividerReference is not needed. On the other hand, if I don’t specify Clock or divider the SPI will run in 60Mhz? I have no clue if slave circuit can handle that. The only thing I know right now, is that my clock reading (oscilloscope) where funky. T…

[image] bytheway: I don't specify Clock or divider the SPI will run in 60Mhz? SPI clock is 60MHz and SPI1 is 30MHz, however the divider is set to DIV2 by default so they will run at 30MHz and 15Mhz respectively. Now thinking about this, it might be a good idea to default these to something s…

So, here is what’s works for me as test (I played around with Clock speed): void setup() { SPI.begin(); SPI.setClockSpeed(10, MHZ); SPI.setBitOrder(MSBFIRST); // Data is read and written MSB first. SPI.setDataMode(SPI_MODE0); } void loop() { Serial.println(registerRead()); …

This overload of SPI.transfer() is meant for transfering a fair number of bytes, and uses DMA for speed. If you only want to transfer single bytes you'd better use result = SPI.transfer(cmdByte);. The docs do tell about the function meaning SPI.transfer(tx_buffer, rx_buffer, 1, NULL); // synch…

Thanks for the above answer. Just want to add some code that works for me, enjoy: /* ========= Application.cpp ============= */ uint8_t _latchPin = A2; uint8_t _sclkPin = A3; uint8_t _sdoPin = A4; uint8_t _sdiPin = A5; void setup() { //Initializes the SPI bus by setting SCK, MOSI, and a user-spe…

is the above code for master or slave? and is it not important to specify like this SPI2.begin(SPI_MODE_SLAVE, DAC1); to make the hardware slave or master?

i assume the above code is for master and it is receiving data. Can you tell me the code for slave, that is sending data? I tried to communication in electron(master ) and P1(slave) but slave is receiving nothing.

An SPI slave will not be able to send data on its own. It needs the master to provide the clock and can only send when the master wants to receive data from that device (SS/CS pulled LOW). The sample code for SPI.onSelect() should provide some clues. In a bidirectional setup, you’d usually see the…

Thanks for the response, but that’s exactly what i am trying to do. Electron is master and it has to send data to the slave wifi. Electron code (master): /******************* electron ****************************/ #include "application.h" static uint8_t rx_buffer[64]; static uint8_t tx_buffer[6…

Hardware SPI setup

Getting Started

Arjun June 7, 2017, 3:31pm 22

and this was asked by me, so pins and code are already provided in this link. thank you

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Hardware SPI setup

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