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mbed library sources

Dependents:   Encrypted my_mbed lklk CyaSSL_DTLS_Cellular ... more

Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

Import librarymbed

The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

Diff: targets/hal/TARGET_STM/TARGET_NUCLEO_F072RB/i2c_api.c

Revision:
305:1f0269907d8b
Parent:
247:135e3186a638
Child:
402:09075a3b15e3
--- a/targets/hal/TARGET_STM/TARGET_NUCLEO_F072RB/i2c_api.c	Fri Aug 29 17:15:07 2014 +0100
+++ b/targets/hal/TARGET_STM/TARGET_NUCLEO_F072RB/i2c_api.c	Fri Aug 29 20:45:07 2014 +0100
@@ -59,6 +59,9 @@
 
 I2C_HandleTypeDef I2cHandle;
 
+int i2c1_inited = 0;
+int i2c2_inited = 0;
+
 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
     // Determine the I2C to use
     I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
@@ -67,20 +70,27 @@
     obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
     MBED_ASSERT(obj->i2c != (I2CName)NC);
 
-    // Enable I2C clock
-    if (obj->i2c == I2C_1) {
+    // Enable I2C1 clock and pinout if not done
+    if ((obj->i2c == I2C_1)&& !i2c1_inited) {
+        i2c1_inited = 1;
         __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
         __I2C1_CLK_ENABLE();
+        // Configure I2C pins
+        pinmap_pinout(sda, PinMap_I2C_SDA);
+        pinmap_pinout(scl, PinMap_I2C_SCL);
+        pin_mode(sda, OpenDrain);
+        pin_mode(scl, OpenDrain);
     }
-    if (obj->i2c == I2C_2) {
+    // Enable I2C2 clock and pinout if not done
+    if ((obj->i2c == I2C_2)&& !i2c2_inited) {
+        i2c2_inited = 1;
         __I2C2_CLK_ENABLE();
-    }
-
     // Configure I2C pins
     pinmap_pinout(sda, PinMap_I2C_SDA);
     pinmap_pinout(scl, PinMap_I2C_SCL);
     pin_mode(sda, OpenDrain);
     pin_mode(scl, OpenDrain);
+    }
 
     // Reset to clear pending flags if any
     i2c_reset(obj);
@@ -91,8 +101,12 @@
 
 void i2c_frequency(i2c_t *obj, int hz) {
     MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
+    I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
+    int timeout;
 
-    I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
+    // wait before init
+    timeout = LONG_TIMEOUT;
+    while((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
 
     // Common settings: I2C clock = 48 MHz, Analog filter = ON, Digital filter coefficient = 0
     switch (hz) {
@@ -274,6 +288,12 @@
 }
 
 void i2c_reset(i2c_t *obj) {
+    int timeout;
+	
+    // wait before reset
+    timeout = LONG_TIMEOUT;
+    while((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
+
     if (obj->i2c == I2C_1) {
         __I2C1_FORCE_RESET();
         __I2C1_RELEASE_RESET();