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);
I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
if (obj->i2c == (I2CName)NC) {
error("I2C error: pinout mapping failed.");
}
// Enable I2C clock
if (obj->i2c == I2C_1) {
__HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
__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);
// Reset to clear pending flags if any
i2c_reset(obj);
// I2C configuration
i2c_frequency(obj, 100000); // 100 kHz per default
}
void i2c_init(i2c_t *obj, PinName sda, PinName scl)
{
static int i2c1_inited = 0;
static int i2c2_inited = 0;
#if defined(I2C3_BASE)
static int i2c3_inited = 0;
#endif
// Determine the I2C to use
I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
MBED_ASSERT(obj->i2c != (I2CName)NC);
// 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);
}
// 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);
}
#if defined(I2C3_BASE)
// 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);
}
#endif
// Reset to clear pending flags if any
i2c_reset(obj);
// I2C configuration
i2c_frequency(obj, 100000); // 100 kHz per default
}
/**
* @brief Initializes the RCC extended peripherals clocks according to the specified parameters in the
* RCC_PeriphCLKInitTypeDef.
* @param PeriphClkInit: pointer to an RCC_PeriphCLKInitTypeDef structure that
* contains the configuration information for the Extended Peripherals clocks(USART1,USART2, LPUART1,
* I2C1, RTC, USB/RNG and LPTIM1 clocks).
* @retval HAL status
*/
HAL_StatusTypeDef HAL_RCCEx_PeriphCLKConfig(RCC_PeriphCLKInitTypeDef *PeriphClkInit)
{
uint32_t tickstart = 0;
uint32_t tmpreg = 0;
/* Check the parameters */
assert_param(IS_RCC_PERIPHCLK(PeriphClkInit->PeriphClockSelection));
/*------------------------------- USART1 Configuration ------------------------*/
if(((PeriphClkInit->PeriphClockSelection) & RCC_PERIPHCLK_USART1) == RCC_PERIPHCLK_USART1)
{
/* Check the parameters */
assert_param(IS_RCC_USART1CLKSOURCE(PeriphClkInit->Usart1ClockSelection));
/* Configure the USART1 clock source */
__HAL_RCC_USART1_CONFIG(PeriphClkInit->Usart1ClockSelection);
}
/*----------------------------- USART2 Configuration --------------------------*/
if(((PeriphClkInit->PeriphClockSelection) & RCC_PERIPHCLK_USART2) == RCC_PERIPHCLK_USART2)
{
/* Check the parameters */
assert_param(IS_RCC_USART2CLKSOURCE(PeriphClkInit->Usart2ClockSelection));
/* Configure the USART2 clock source */
__HAL_RCC_USART2_CONFIG(PeriphClkInit->Usart2ClockSelection);
}
/*------------------------------ LPUART1 Configuration ------------------------*/
if(((PeriphClkInit->PeriphClockSelection) & RCC_PERIPHCLK_LPUART1) == RCC_PERIPHCLK_LPUART1)
{
/* Check the parameters */
assert_param(IS_RCC_LPUART1CLKSOURCE(PeriphClkInit->Lpuart1ClockSelection));
/* Configure the LPUAR1 clock source */
__HAL_RCC_LPUART1_CONFIG(PeriphClkInit->Lpuart1ClockSelection);
}
/*------------------------------ I2C1 Configuration ------------------------*/
if(((PeriphClkInit->PeriphClockSelection) & RCC_PERIPHCLK_I2C1) == RCC_PERIPHCLK_I2C1)
{
/* Check the parameters */
assert_param(IS_RCC_I2C1CLKSOURCE(PeriphClkInit->I2c1ClockSelection));
/* Configure the I2C1 clock source */
__HAL_RCC_I2C1_CONFIG(PeriphClkInit->I2c1ClockSelection);
}
/*---------------------------- RTC configuration -------------------------------*/
if(((PeriphClkInit->PeriphClockSelection) & RCC_PERIPHCLK_RTC) == (RCC_PERIPHCLK_RTC))
{
/* Enable Power Clock*/
__PWR_CLK_ENABLE();
/* Enable write access to Backup domain */
PWR->CR |= PWR_CR_DBP;
/* Wait for Backup domain Write protection disable */
tickstart = HAL_GetTick();
while((PWR->CR & PWR_CR_DBP) == RESET)
{
if((HAL_GetTick() - tickstart ) > DBP_TIMEOUT_VALUE)
{
return HAL_TIMEOUT;
}
}
/* Reset the Backup domain only if the RTC Clock source selection is modified */
if((RCC->CSR & RCC_CSR_RTCSEL) != (PeriphClkInit->RTCClockSelection & RCC_CSR_RTCSEL))
{
/* Store the content of CSR register before the reset of Backup Domain */
tmpreg = (RCC->CSR & ~(RCC_CSR_RTCSEL));
/* RTC Clock selection can be changed only if the Backup Domain is reset */
__HAL_RCC_BACKUPRESET_FORCE();
__HAL_RCC_BACKUPRESET_RELEASE();
/* Restore the Content of CSR register */
RCC->CSR = tmpreg;
}
/* If LSE is selected as RTC clock source, wait for LSE reactivation */
if(PeriphClkInit->RTCClockSelection == RCC_RTCCLKSOURCE_LSE)
{
/* Get timeout */
tickstart = HAL_GetTick();
/* Wait till LSE is ready */
while(__HAL_RCC_GET_FLAG(RCC_FLAG_LSERDY) == RESET)
{
if((HAL_GetTick() - tickstart ) > LSE_TIMEOUT_VALUE)
{
return HAL_TIMEOUT;
}
}
}
__HAL_RCC_RTC_CONFIG(PeriphClkInit->RTCClockSelection);
}
#if !defined(STM32L051xx) && !defined(STM32L061xx)
/*---------------------------- USB and RNG configuration --------------------*/
if(((PeriphClkInit->PeriphClockSelection) & RCC_PERIPHCLK_USB) == (RCC_PERIPHCLK_USB))
{
assert_param(IS_RCC_USBCLKSOURCE(PeriphClkInit->UsbClockSelection));
__HAL_RCC_USB_CONFIG(PeriphClkInit->UsbClockSelection);
}
#endif /* !(STM32L051xx) && !(STM32L061xx) */
/*---------------------------- LPTIM1 configuration ------------------------*/
if(((PeriphClkInit->PeriphClockSelection) & RCC_PERIPHCLK_LPTIM1) == (RCC_PERIPHCLK_LPTIM1))
{
assert_param(IS_RCC_LPTIMCLK(PeriphClkInit->LptimClockSelection));
__HAL_RCC_LPTIM1_CONFIG(PeriphClkInit->LptimClockSelection);
}
return HAL_OK;
}