Diff: AT24C1024.cpp

Revision:

0:b9f5cf0309af

Child:

1:05012e75c050

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/AT24C1024.cpp	Sun Jun 22 06:07:18 2014 +0000
@@ -0,0 +1,112 @@
+/*
+ * mbed library program 
+ *  Control AT24C1024 EEPROM
+ *
+ * Copyright (c) 2014 Kenji Arai / JH1PJL
+ *  http://www.page.sannet.ne.jp/kenjia/index.html
+ *  http://mbed.org/users/kenjiArai/
+ *      Created: June      17th, 2014
+ *      Revised: June      21st, 2014
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
+ * AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "mbed.h"
+#include "AT24C1024.h"
+
+AT24C1024::AT24C1024 (PinName p_sda, PinName p_scl) : i2c(p_sda, p_scl) {
+    AT24C1024_addr = AT24C1024ADDR;
+}
+
+AT24C1024::AT24C1024 (I2C& p_i2c) : i2c(p_i2c) { 
+    AT24C1024_addr = AT24C1024ADDR;
+}
+
+uint8_t AT24C1024::read(int addr) {
+uint8_t eep_dt[2];
+uint8_t tmp_addr;
+
+    tmp_addr = AT24C1024_addr;
+    if ( addr & 0x10000 ){  // addr > 0xffff then P0 sets 1
+        tmp_addr += 0x02;       // P0=1
+    }
+    eep_dt[0] = ( uint8_t )( (addr & 0xff00) >> 8 );
+    eep_dt[1] = ( uint8_t )( (addr & 0xff) );
+    i2c_write_n_bytes((int)tmp_addr, (char *)eep_dt, 2);
+    i2c_read_n_bytes((int)tmp_addr, (char *)eep_dt, 1);
+    return eep_dt[0];
+}
+
+void AT24C1024::write(int addr, uint8_t dt) {
+uint8_t eep_dt[3];
+uint8_t tmp_addr;
+
+    tmp_addr = AT24C1024_addr;
+    if ( addr & 0x10000 ){  // addr > 0xffff then P0 sets 1
+        tmp_addr += 0x02;       // P0=1
+    }
+    eep_dt[0] = ( uint8_t )( (addr & 0xff00) >> 8 );
+    eep_dt[1] = ( uint8_t )( (addr & 0xff) );
+    eep_dt[2] = dt;
+    i2c_write_n_bytes((int)tmp_addr, (char *)eep_dt, 3);
+}
+
+AT24C_STATUS AT24C1024::read_page(uint32_t addr_page_top, uint8_t *dt, int size) {
+uint8_t eep_dt[2];
+uint8_t tmp_addr;
+
+    if (size >= 256 + 2){
+        if ((addr_page_top & 0xff) == 0){
+            tmp_addr = AT24C1024_addr;
+            if ( addr_page_top & 0x10000 ){ // addr > 0xffff then P0 sets 1
+                tmp_addr += 0x02;               // P0=1
+            }
+            eep_dt[0] = ( uint8_t )( (addr_page_top & 0xff00) >> 8 );
+            eep_dt[1] = 0;
+            i2c_write_n_bytes((int)tmp_addr, (char *)eep_dt, 2);
+            i2c_read_n_bytes((int)tmp_addr, (char *)dt, 256);
+            return AT24C_OK;
+        } else {
+            return AT24C_WRONG_TOP_ADDR;
+        }
+    } else {
+        return AT24C_WRONG_BF_SIZE;
+    }
+}
+
+AT24C_STATUS AT24C1024::write_page(uint32_t addr_page_top, uint8_t *dt, int size) {
+uint8_t tmp_addr;
+int i;
+
+    if (size >= 256 + 2){
+        if ((addr_page_top & 0xff) == 0){
+            for (i = 255 + 2; i > 1; i--){  // shift data
+                dt[i] = dt[i-2];
+            }
+            tmp_addr = AT24C1024_addr;
+            if ( addr_page_top & 0x10000 ){ // addr > 0xffff then P0 sets 1
+                tmp_addr += 0x02;               // P0=1
+            }
+            dt[0] = ( uint8_t )( (addr_page_top & 0xff00) >> 8 );
+            dt[1] = 0;
+            i2c_write_n_bytes((int)tmp_addr, (char *)dt, 256 + 2);
+            return AT24C_OK;
+        } else {
+            return AT24C_WRONG_TOP_ADDR;
+        }
+    } else {
+        return AT24C_WRONG_BF_SIZE;
+    }
+}
+
+void AT24C1024::i2c_read_n_bytes (int addr, char *dt, int n) {
+    i2c.read(addr, dt, n);
+}
+
+void AT24C1024::i2c_write_n_bytes (int addr, char *dt, int n) {
+    i2c.write(addr, dt, n);
+}