void i2c_frequency(i2c_t *obj, int hz) {
MBED_ASSERT((hz == 100000) || (hz == 200000) || (hz == 400000) || (hz == 1000000));
I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
I2C_InitTypeDef I2C_InitStructure;
uint32_t tim = 0;
// Disable the Fast Mode Plus capability
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); // Enable SYSCFG clock
SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C1, DISABLE);
SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C2, DISABLE);
/*
Values calculated with I2C_Timing_Configuration_V1.0.1.xls file (see AN4235)
* Standard mode (up to 100 kHz)
* Fast Mode (up to 400 kHz)
* Fast Mode Plus (up to 1 MHz)
Below values obtained with:
- I2C clock source = 48 MHz (System Clock)
- Analog filter delay = ON
- Digital filter coefficient = 0
- Rise time = 100 ns
- Fall time = 10ns
*/
switch (hz) {
case 100000:
tim = 0x10805E89; // Standard mode
break;
case 200000:
tim = 0x00905E82; // Fast Mode
break;
case 400000:
tim = 0x00901850; // Fast Mode
break;
case 1000000:
tim = 0x00700818; // Fast Mode Plus
// Enable the Fast Mode Plus capability
if (obj->i2c == I2C_1) {
SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C1, ENABLE);
}
if (obj->i2c == I2C_2) {
SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C2, ENABLE);
}
break;
default:
break;
}
// I2C configuration
I2C_DeInit(i2c);
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;
I2C_InitStructure.I2C_DigitalFilter = 0x00;
I2C_InitStructure.I2C_OwnAddress1 = 0x00;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_Timing = tim;
I2C_Init(i2c, &I2C_InitStructure);
I2C_Cmd(i2c, ENABLE);
}
void i2c_frequency(i2c_t *obj, int hz) {
I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
I2C_InitTypeDef I2C_InitStructure;
uint32_t tim = 0;
// Disable the Fast Mode Plus capability
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); // Enable SYSCFG clock
SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C1, DISABLE);
SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C2, DISABLE);
/*
Values calculated with I2C_Timing_Configuration_V1.0.1.xls file (see AN4235)
* Standard mode (up to 100 kHz)
* Fast Mode (up to 400 kHz)
* Fast Mode Plus (up to 1 MHz)
Below values obtained with:
- I2C clock source = 8 MHz (HSI clock per default)
- Analog filter delay = ON
- Digital filter coefficient = 0
- Rise time = 100 ns
- Fall time = 10ns
*/
switch (hz) {
case 100000:
tim = 0x00201D2B; // Standard mode
break;
case 200000:
tim = 0x0010021E; // Fast Mode
break;
case 400000:
tim = 0x0010020A; // Fast Mode
break;
case 1000000:
tim = 0x00100001; // Fast Mode Plus
// Enable the Fast Mode Plus capability
if (obj->i2c == I2C_1) {
SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C1, ENABLE);
}
if (obj->i2c == I2C_2) {
SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C2, ENABLE);
}
break;
default:
error("Only 100kHz, 200kHz, 400kHz and 1MHz I2C frequencies are supported.");
break;
}
// I2C configuration
I2C_DeInit(i2c);
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;
I2C_InitStructure.I2C_DigitalFilter = 0x00;
I2C_InitStructure.I2C_OwnAddress1 = 0x00;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_Timing = tim;
I2C_Init(i2c, &I2C_InitStructure);
I2C_Cmd(i2c, ENABLE);
}
void i2c_frequency(i2c_t *obj, int hz) {
I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
I2C_InitTypeDef I2C_InitStructure;
uint32_t tim = 0;
// Disable the Fast Mode Plus capability
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); // Enable SYSCFG clock
SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C1, DISABLE);
SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C2, DISABLE);
/*
Values calculated with I2C_Timing_Configuration_V1.0.1.xls file (see AN4235)
* Standard mode (up to 100 kHz)
* Fast Mode (up to 400 kHz)
* Fast Mode Plus (up to 1 MHz)
Below values obtained with:
- 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
break;
case 400000:
tim = 0x00C0216C; // Fast Mode
break;
case 1000000:
tim = 0x00900B22; // Fast Mode Plus
// Enable the Fast Mode Plus capability
if (obj->i2c == I2C_1) {
SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C1, ENABLE);
}
if (obj->i2c == I2C_2) {
SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C2, ENABLE);
}
break;
default:
error("Only 100kHz, 200kHz, 400kHz and 1MHz I2C frequencies are supported.");
break;
}
}
else if (SystemCoreClock == 72000000) {
switch (hz) {
case 100000:
tim = 0x10C08DCF; // Standard mode
break;
case 200000:
tim = 0xA010031A; // Fast Mode
break;
case 400000:
tim = 0x00E0257A; // Fast Mode
break;
case 1000000:
tim = 0x00A00D26; // Fast Mode Plus
// Enable the Fast Mode Plus capability
if (obj->i2c == I2C_1) {
SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C1, ENABLE);
}
if (obj->i2c == I2C_2) {
SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C2, ENABLE);
}
break;
default:
error("Only 100kHz, 200kHz, 400kHz and 1MHz I2C frequencies are supported.");
break;
}
}
else {
error("System clock setting is not supported.");
}
// I2C configuration
I2C_DeInit(i2c);
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;
I2C_InitStructure.I2C_DigitalFilter = 0x00;
I2C_InitStructure.I2C_OwnAddress1 = 0x00;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_Timing = tim;
I2C_Init(i2c, &I2C_InitStructure);
I2C_Cmd(i2c, ENABLE);
}
