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-rw-r--r--examples/i2c_slave_example.cpp110
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diff --git a/examples/i2c_slave_example.cpp b/examples/i2c_slave_example.cpp
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-/*
- * i2c_slave example.cpp
- *
- * Created on: 4 Sep 2012
- * Author: Barry Carter <barry.carter@gmail.com>
- */
-#include <wirish/wirish.h>
-#include <i2c.h>
-
-#define USE_BUFFERED_EXAMPLE 1
-
-i2c_msg msg;
-i2c_msg *pmsg = &msg;
-uint8 buffer[255];
-
-uint8 value_to_print = 'A';
-
-void funcrx(i2c_msg *msg)
-{
- // Received length will be in msg->length
- char return_data = msg->data[0];
- value_to_print = return_data;
-}
-
-#if USE_BUFFERED_EXAMPLE == 1
-/* We ARE using a buffer to transmit the data out.
- * Make sure you fill the buffer with the data AND you set the length correctly
- */
-void functx(i2c_msg *msg)
-{
- // Cheeky. We are using the received byte of the data which is currently in
- // byte 0 to echo it back to the master device
- //msg->data[0] = 0x01; // We are re-using the rx buffer here to echo the request back
- msg->data[1] = 0x02;
- msg->data[2] = 0x03;
- msg->data[3] = 0x04;
- msg->data[4] = 0x05;
- msg->length = 5;
-}
-
-#else
-
-/* We are NOT using the buffered data transmission
- * We will get this callback for each outgoing packet. Make sure to call i2c_write
- * Strickly speaking, we should be sending a NACk on the last byte we want to send
- * but for this test example I am going to assume the master will NACK it when it
- * wants to stop.
- */
-void functx(i2c_msg *msg)
-{
- i2c_write(I2C1, msg->data[0]);
-}
-
-#endif
-
-
-void setup() {
- SerialUSB.begin();
- SerialUSB.println("I2C Slave example");
-
- // attach the buffer
- msg.data = buffer;
-
- /* Init slave mode. Enables master too
- * We are going to configure the slave device to
- * - enable fast I2C (400khz)
- * - dual addresses (can have 2 addresses per module)
- * general call (accepts data writes to 0x00 on a broadcast basis)
- *
- * If the buffered example is enabled, then we also enable the
- * buffer for rx and tx.
- * Note you can independently enable/disable RX and TX buffers to
- * allow a buffered read and direct writes. Useful if you don't know how
- * much the master will read.
- */
-#if USE_BUFFERED_EXAMPLE == 1
- i2c_slave_enable(I2C1, I2C_FAST_MODE | I2C_SLAVE_DUAL_ADDRESS | I2C_SLAVE_GENERAL_CALL | I2C_SLAVE_USE_RX_BUFFER | I2C_SLAVE_USE_TX_BUFFER);
-#else
- i2c_slave_enable(I2C1, I2C_FAST_MODE | I2C_SLAVE_DUAL_ADDRESS | I2C_SLAVE_GENERAL_CALL);
-#endif
-
- // attach receive handler
- i2c_slave_attach_recv_handler(I2C1, &msg, funcrx);
- // attach transmit handler
- i2c_slave_attach_transmit_handler(I2C1, &msg, functx);
-
- // set addresss 1 to 16
- i2c_slave_set_own_address(I2C1, 0x10);
- // set addresss 2 to 32
- i2c_slave_set_own_address2(I2C1, 0x20);
-}
-
-void loop() {
- SerialUSB.print("Last byte: ");
- SerialUSB.println(value_to_print);
-}
-
-// Force init() to be called before anything else.
-__attribute__((constructor)) void premain() {
- init();
-}
-
-int main(void) {
- setup();
-
- while (true) {
- loop();
- }
- return 0;
-}