Diff: ds1775_c.cpp

Revision:

9:315236fb3c6a

Parent:

8:b2d4c71268aa

Child:

10:03645de9c017

--- a/ds1775_c.cpp	Sun Apr 07 07:43:11 2019 +0000
+++ b/ds1775_c.cpp	Sun Apr 07 08:59:48 2019 +0000
@@ -57,6 +57,31 @@
     return DS1775_NO_ERROR;
 }
  
+/******************************************************************************/
+int ds1775_read_cfg_reg(uint8_t *value, I2C &i2c_bus) 
+{
+    int32_t ret;
+    char data[1] = {0};
+    char reg = DS1775_REG_CONFIGURATION;
+
+    /* write to the Register Select, true is for repeated start */
+    ret = i2c_bus.write(ds1775_write_address, &reg, 1, true);
+    if (ret == 0) {
+        ret = i2c_bus.read(ds1775_read_address, data, 1, false);
+        if (ret == 0) {
+            *value = data[0];
+        printf("%s: cfg %x\r\n", __func__, *value);
+            return DS1775_NO_ERROR;
+        } else {
+            printf("%s: failed to read data: ret: %d\r\n", __func__, ret);
+            }
+    } else {                
+        printf("%s: failed to write to Register Select: ret: %d\r\n",
+            __func__, ret);
+    }
+    return DS1775_ERROR;
+}
+
 
 /******************************************************************************/
 int ds1775_read_reg(uint16_t *value, char reg, I2C &i2c_bus) 
@@ -66,7 +91,7 @@
     ds1775_raw_data tmp;
      
     if (reg <= DS1775_REG_MAX) {
-        /* write to the Register Select */
+        /* write to the Register Select, true is for repeated start */
         ret = i2c_bus.write(ds1775_write_address, &reg, 1, true);
         /* read the two bytes of data */
         if (ret == 0) {
@@ -131,11 +156,6 @@
         cmd[2] = tmp.lsb;
         ret = i2c_bus.write(ds1775_write_address, cmd, 3, false);
         if (ret == 0) {
-            if (DS1775_REG_CONFIGURATION == reg) {
-                ds1775_extended_format = 0;
-                if (tmp.uwrd & DS1775_CFG_EXTENDED_FORMAT)
-                    ds1775_extended_format = 1;
-            }
             return DS1775_NO_ERROR;
         } else {
             printf("%s: I2C write error %d\r\n",__func__, ret);
@@ -147,8 +167,29 @@
     }
 }
 
+/******************************************************************************/
+int ds1775_write_reg_one_byte(uint8_t value, char reg, I2C &i2c_bus) 
+{
+    int32_t ret;
+    char cmd[2];
 
-int ds1775_write_cfg(uint16_t cfg, I2C &i2c_bus)
+    if (reg == DS1775_REG_CONFIGURATION) {
+        cmd[0] = reg;
+        cmd[1] = value;
+        ret = i2c_bus.write(ds1775_write_address, cmd, 2, false);
+        if (ret == 0) {
+            return DS1775_NO_ERROR;
+        } else {
+            printf("%s: I2C write error %d\r\n",__func__, ret);
+            return DS1775_ERROR;
+        }
+    } else {
+        printf("%s: register value invalid %x\r\n",__func__, reg);
+        return DS1775_ERROR;
+    }
+}
+
+int ds1775_write_cfg(uint8_t cfg, I2C &i2c_bus)
 {
     return ds1775_write_reg(cfg, DS1775_REG_CONFIGURATION, i2c_bus);
 }