/**
* @brief Measure the LSI frequency using timer IC1 and update the calibration registers.
* @note It is recommended to use a timer clock frequency of at least 10MHz in order
* to obtain a better in the LSI frequency measurement.
* @param None
* @retval None
*/
uint32_t LSIMeasurment(void)
{
uint32_t lsi_freq_hz = 0x0;
uint32_t fmaster = 0x0;
uint16_t ICValue1 = 0x0;
uint16_t ICValue2 = 0x0;
/* Get master frequency */
fmaster = CLK_GetClockFreq();
/* Enable the LSI measurement: LSI clock connected to timer Input Capture 1 */
AWU->CSR |= AWU_CSR_MSR;
/* Measure the LSI frequency with TIMER Input Capture 1 */
/* Capture only every 8 events!!! */
/* Enable capture of TI1 */
TIM3_ICInit(TIM3_CHANNEL_1, TIM3_ICPOLARITY_RISING, TIM3_ICSELECTION_DIRECTTI, TIM3_ICPSC_DIV8, 0);
/* Enable TIM3 */
TIM3_Cmd(ENABLE);
/* wait a capture on cc1 */
while ((TIM3->SR1 & TIM3_FLAG_CC1) != TIM3_FLAG_CC1);
/* Get CCR1 value*/
ICValue1 = TIM3_GetCapture1();
TIM3_ClearFlag(TIM3_FLAG_CC1);
/* wait a capture on cc1 */
while ((TIM3->SR1 & TIM3_FLAG_CC1) != TIM3_FLAG_CC1);
/* Get CCR1 value*/
ICValue2 = TIM3_GetCapture1();
TIM3_ClearFlag(TIM3_FLAG_CC1);
/* Disable IC1 input capture */
TIM3->CCER1 &= (uint8_t)(~TIM3_CCER1_CC1E);
/* Disable timer3 */
TIM3_Cmd(DISABLE);
/* Compute LSI clock frequency */
lsi_freq_hz = (8 * fmaster) / (ICValue2 - ICValue1);
/* Disable the LSI measurement: LSI clock disconnected from timer Input Capture 1 */
AWU->CSR &= (uint8_t)(~AWU_CSR_MSR);
return (lsi_freq_hz);
}
void Config()
{
//System clock at power up is HSI/8 = 16MHz/8 = 2MHz
//CLK_SYSCLKDivConfig(CLK_SYSCLKDiv_1); //set HSI/4 = 4MHz SysClk to Core and Memory, minimum clock = 125KHz for CLK_SYSCLKDiv_128
//PWR_PVDCmd(ENABLE); //Power voltage detector and brownout Reset unit supply current 2,6uA
//PWR_PVDLevelConfig(PWR_PVDLevel_2V26); //set Programmable voltage detector threshold to 2,26V
//PWR_GetFlagStatus(PWR_FLAG_PVDOF); //checks whether the specified PWR flag is set or not
//Configure external interrupts - BTN1 and BTN2 presses
//EXTI_SetPinSensitivity(EXTI_Pin_2, EXTI_Trigger_Falling_Low);
//EXTI_SetPinSensitivity(EXTI_Pin_4, EXTI_Trigger_Falling_Low);
//EXTI_SelectPort(EXTI_Port_B);
//EXTI_SetHalfPortSelection(EXTI_HalfPort_B_MSB, ENABLE);
// Timer 4 Configuration
CLK_PeripheralClockConfig(CLK_Peripheral_TIM4, ENABLE); // 8bit: used for system periodic flags and timeouts
TIM4_TimeBaseInit(TIM4_Prescaler_16, 125); // Overflow at 1ms, 2MHz/16/125 = 1000
TIM4_ITConfig(TIM4_IT_Update, ENABLE);
TIM4_Cmd(ENABLE);
// Timer 2 Configuration
CLK_PeripheralClockConfig(CLK_Peripheral_TIM2, ENABLE); // 16bit: used for runtime measurement
TIM2_TimeBaseInit(TIM2_Prescaler_2, TIM2_CounterMode_Up, 0xFFFF); // timebase of 1us, 2MHz/2=1M
TIM2_Cmd(ENABLE);
// Timer3 Configuration
CLK_PeripheralClockConfig(CLK_Peripheral_TIM3, ENABLE);
TIM3_TimeBaseInit(TIM3_Prescaler_2, TIM3_CounterMode_Up, 0xFFFF); // 1us timebase @ 2MHz system clock
TIM3_ICInit(TIM3_Channel_2,
TIM3_ICPolarity_Falling,
TIM3_ICSelection_IndirectTI,
TIM3_ICPSC_Div1,
0);
TIM3_ICInit(TIM3_Channel_1,
TIM3_ICPolarity_Rising,
TIM3_ICSelection_DirectTI,
TIM3_ICPSC_Div1,
0);
TIM3_SelectInputTrigger(TIM3_TRGSelection_TI1FP1);
TIM3_SelectSlaveMode(TIM3_SlaveMode_Reset); // Reset timer on selected trigger signal
TIM3_ITConfig(TIM3_IT_CC1, ENABLE);
TIM3_ITConfig(TIM3_IT_CC2, ENABLE);
TIM3_Cmd(ENABLE);
/* Output PP High - bicolor LED to GND */
GPIO_Init(LED_PORT, LED_PIN1, GPIO_Mode_Out_PP_Low_Slow);
GPIO_Init(LED_PORT, LED_PIN2, GPIO_Mode_Out_PP_Low_Slow);
/* Input pull up no IT - onboard Button, external pull-up */
GPIO_Init(BTN1_PORT, BTN1_PIN, GPIO_Mode_In_FL_No_IT);
/* RFM85W pins */
GPIO_Init(RFM_DATA_PORT, RFM_DATA_PIN, GPIO_Mode_In_FL_No_IT);
/* DEBUG pin */
GPIO_Init(DEBUG_PIN_PORT, DEBUG_PIN_PIN, GPIO_Mode_Out_PP_Low_Fast);
/* H bridge outputs */
GPIO_Init(PMOS_L_PORT, PMOS_L_PIN, GPIO_Mode_Out_PP_High_Fast);
GPIO_Init(PMOS_R_PORT, PMOS_R_PIN, GPIO_Mode_Out_PP_High_Fast);
GPIO_Init(NMOS_L_PORT, NMOS_L_PIN, GPIO_Mode_Out_PP_Low_Fast);
GPIO_Init(NMOS_R_PORT, NMOS_R_PIN, GPIO_Mode_Out_PP_Low_Fast);
}
