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[NUCLEO_F334R8] Fix I2C clock issue #426

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Merged
merged 1 commit into from
Aug 5, 2014
Merged

[NUCLEO_F334R8] Fix I2C clock issue #426

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23 changes: 9 additions & 14 deletions libraries/mbed/targets/hal/TARGET_STM/TARGET_NUCLEO_F334R8/i2c_api.c
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Original file line number Diff line number Diff line change
Expand Up @@ -69,6 +69,9 @@ void i2c_init(i2c_t *obj, PinName sda, PinName scl)
// Enable I2C clock
__I2C1_CLK_ENABLE();

// Configure the I2C clock source
__HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);

// Configure I2C pins
pinmap_pinout(sda, PinMap_I2C_SDA);
pinmap_pinout(scl, PinMap_I2C_SCL);
Expand Down Expand Up @@ -102,22 +105,17 @@ void i2c_frequency(i2c_t *obj, int hz)
- I2C clock source = 64 MHz (System Clock w/ HSI) or 72 (System Clock w/ HSE)
- Analog filter delay = ON
- Digital filter coefficient = 0
- Rise time = 100 ns
- Fall time = 10ns
*/
if (SystemCoreClock == 64000000) {
switch (hz) {
case 100000:
tim = 0x60302730; // Standard mode
break;
case 200000:
tim = 0x00C07AB3; // Fast Mode
tim = 0x10B17DB4; // Standard mode with Rise time = 120ns, Fall time = 120ns
break;
case 400000:
tim = 0x00C0216C; // Fast Mode
tim = 0x00E22163; // Fast Mode with Rise time = 120ns, Fall time = 120ns
break;
case 1000000:
tim = 0x00900B22; // Fast Mode Plus
tim = 0x00A00D1E; // Fast Mode Plus with Rise time = 120ns, Fall time = 10ns
// Enable the Fast Mode Plus capability
__HAL_SYSCFG_FASTMODEPLUS_ENABLE(HAL_SYSCFG_FASTMODEPLUS_I2C1);
break;
Expand All @@ -127,16 +125,13 @@ void i2c_frequency(i2c_t *obj, int hz)
} else if (SystemCoreClock == 72000000) {
switch (hz) {
case 100000:
tim = 0x10C08DCF; // Standard mode
break;
case 200000:
tim = 0xA010031A; // Fast Mode
tim = 0x10D28DCB; // Standard mode with Rise time = 120ns, Fall time = 120ns
break;
case 400000:
tim = 0x00E0257A; // Fast Mode
tim = 0x00F32571; // Fast Mode with Rise time = 120ns, Fall time = 120ns
break;
case 1000000:
tim = 0x00A00D26; // Fast Mode Plus
tim = 0x00C00D24; // Fast Mode Plus with Rise time = 120ns, Fall time = 10ns
// Enable the Fast Mode Plus capability
__HAL_SYSCFG_FASTMODEPLUS_ENABLE(HAL_SYSCFG_FASTMODEPLUS_I2C1);
break;
Expand Down