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SPISlave

SPISlave class hierarchy

Use the SPISlave class to communicate with a SPI master device.

The default format is set to 8 bits, mode 0 and a clock frequency of 1MHz. Synchronization level: not protected.

SPISlave class reference

Public Member Functions
 SPISlave (PinName mosi, PinName miso, PinName sclk, PinName ssel)
 Create a SPI slave connected to the specified pins. More...
void format (int bits, int mode=0)
 Configure the data transmission format. More...
void frequency (int hz=1000000)
 Set the SPI bus clock frequency. More...
int receive (void)
 Polls the SPI to see if data has been received. More...
int read (void)
 Retrieve data from receive buffer as slave. More...
void reply (int value)
 Fill the transmission buffer with the value to be written out as slave on the next received message from the master. More...

SPISlave example

Reply to a SPI master as slave:

#include "mbed.h"

SPISlave device(D9, D11, D12, D13); // mosi, miso, sclk, ssel

int main() {
   device.reply(0x00);              // Prime SPI with first reply
   while(1) {
       if(device.receive()) {
           int v = device.read();   // Read byte from master
           v = (v + 1) % 0x100;     // Add one to it, modulo 256
           device.reply(v);         // Make this the next reply
       }
   }
}
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