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... | |
| SPISlave (const spi_pinmap_t &pinmap) | |
| 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
}
}
}