mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
Diff: targets/hal/TARGET_STM/TARGET_NUCLEO_F401RE/i2c_api.c
- Revision:
- 305:1f0269907d8b
- Parent:
- 247:135e3186a638
--- a/targets/hal/TARGET_STM/TARGET_NUCLEO_F401RE/i2c_api.c Fri Aug 29 17:15:07 2014 +0100 +++ b/targets/hal/TARGET_STM/TARGET_NUCLEO_F401RE/i2c_api.c Fri Aug 29 20:45:07 2014 +0100 @@ -60,6 +60,10 @@ I2C_HandleTypeDef I2cHandle; +int i2c1_inited = 0; +int i2c2_inited = 0; +int i2c3_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); @@ -68,22 +72,36 @@ 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; __I2C1_CLK_ENABLE(); - } - if (obj->i2c == I2C_2) { - __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); } - if (obj->i2c == I2C_3) { - __I2C3_CLK_ENABLE(); + // 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); } - - // Configure I2C pins - pinmap_pinout(sda, PinMap_I2C_SDA); - pinmap_pinout(scl, PinMap_I2C_SCL); - pin_mode(sda, OpenDrain); - pin_mode(scl, OpenDrain); + // Enable I2C3 clock and pinout if not done + if ((obj->i2c == I2C_3)&& !i2c3_inited) { + i2c3_inited = 1; + __I2C3_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); @@ -98,6 +116,11 @@ void i2c_frequency(i2c_t *obj, int hz) { MBED_ASSERT((hz != 0) && (hz <= 400000)); I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c); + int timeout; + + // wait before init + timeout = LONG_TIMEOUT; + while((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0)); // I2C configuration I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT; @@ -285,6 +308,12 @@ } 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();