1 files changed, 42 insertions, 0 deletions
diff --git a/src/at24c.rs b/src/at24c.rs
new file mode 100644
index 0000000..534f736
--- /dev/null
+++ b/src/at24c.rs
@@ -0,0 +1,42 @@
+extern crate stm32f103xx;
+use i2c::{I2C, TransDir, DutyType};
+
+const AT24C_ADDR: u8 = 0b1010111; /* suppose A0, A1, A2 = 1 */
+
+pub struct AT24C<'a, 'b: 'a>(&'a I2C<'a, 'b>);
+
+impl<'a, 'b> AT24C<'a, 'b> {
+    pub fn new(i2c: &'a I2C<'a, 'b>) -> AT24C<'a, 'b> {
+        AT24C(i2c)
+    }
+
+    pub fn read(&self, start: u16, size: usize, buf: &mut [u8]) {
+        let &AT24C(ref i2c) = self;
+        i2c.conf_ack(true); /* enable ack */
+        i2c.start(true, true); /* start condition (for writing addr) */
+        i2c.send_addr(AT24C_ADDR, TransDir::TRANSMITTER, true);
+        i2c.send(((start >> 8) & 0x0f) as u8, true); /* first word addr */
+        i2c.send((start & 0xff) as u8, true);        /* second word addr */
+        i2c.start(true, true); /* restart to read */
+        i2c.send_addr(AT24C_ADDR, TransDir::RECEIVER, true);
+        for i in 0..(size - 1) {
+            buf[i] = i2c.recv(true);
+        }
+        i2c.conf_ack(false); /* nack */
+        buf[size - 1] = i2c.recv(true);
+        i2c.stop(true);
+    }
+
+    pub fn page_write(&self, start: u16, size: usize, buf: &[u8]) {
+        let &AT24C(ref i2c) = self;
+        i2c.conf_ack(true); /* enable ack */
+        i2c.start(true, true); /* start condition (for writing addr) */
+        i2c.send_addr(AT24C_ADDR, TransDir::TRANSMITTER, true);
+        i2c.send(((start >> 8) & 0x0f) as u8, true); /* first word addr */
+        i2c.send((start & 0xff) as u8, true);        /* second word addr */
+        for i in 0..size {
+            i2c.send(buf[i], true);
+        }
+        i2c.stop(true);
+    }
+}