There are two problems with this clock setting:
- In MX advanced setting, if I set RCC driver in using LL library. The initiating code will stuck in "while(LL_RCC_HSE_IsReady() != 1)". However if the skeleton code is generate by setting RCC to HAL the init code works fine and do not stuck in the middle. The init code generated by CubeMX is attached below.
- For the RCC code generated using HAL, although the code runs in the debug mode, the system clock and timer clock frequencies are not the same as it mean to be (96MHz/48MHz). This was tested by setting timer pre-scaler and Auto reload register and check the update event. The real frequency seem to be much slower then the expected although all the code for setting system clock is made by CubeMX. Not sure whats wrong here.
// system clock init code using LL
void SystemClock_Config(void)
{
LL_FLASH_SetLatency(LL_FLASH_LATENCY_3);
if(LL_FLASH_GetLatency() != LL_FLASH_LATENCY_3)
{
Error_Handler();
}
//LL_PWR_SetRegulVoltageScaling(LL_PWR_REGU_VOLTAGE_SCALE1);
LL_RCC_HSE_EnableBypass();
LL_RCC_HSE_Enable();
/* Wait till HSE is ready */
while(LL_RCC_HSE_IsReady() != 1)
{
}
LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSE, LL_RCC_PLLM_DIV_4, 192, LL_RCC_PLLP_DIV_4);
LL_RCC_PLL_ConfigDomain_48M(LL_RCC_PLLSOURCE_HSE, LL_RCC_PLLM_DIV_4, 192, LL_RCC_PLLQ_DIV_8);
LL_RCC_PLLI2S_ConfigDomain_I2S(LL_RCC_PLLSOURCE_HSE, LL_RCC_PLLI2SM_DIV_5, 200, LL_RCC_PLLI2SR_DIV_2);
LL_RCC_PLL_Enable();
/* Wait till PLL is ready */
while(LL_RCC_PLL_IsReady() != 1)
{
}
LL_RCC_PLLI2S_Enable();
/* Wait till PLL is ready */
while(LL_RCC_PLLI2S_IsReady() != 1)
{
}
LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_4);
LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
/* Wait till System clock is ready */
while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
{
}
LL_Init1msTick(96000000);
LL_SYSTICK_SetClkSource(LL_SYSTICK_CLKSOURCE_HCLK);
LL_SetSystemCoreClock(96000000);
LL_RCC_SetI2SClockSource(LL_RCC_I2S1_CLKSOURCE_PLLI2S);
LL_RCC_SetTIMPrescaler(LL_RCC_TIM_PRESCALER_TWICE);
}// system clock init using HAL
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
/**Configure the main internal regulator output voltage
*/
__HAL_RCC_PWR_CLK_ENABLE();
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
/**Initializes the CPU, AHB and APB busses clocks
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLM = 4;
RCC_OscInitStruct.PLL.PLLN = 192;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
RCC_OscInitStruct.PLL.PLLQ = 8;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/**Initializes the CPU, AHB and APB busses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK)
{
Error_Handler();
}
PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_I2S;
PeriphClkInitStruct.PLLI2S.PLLI2SN = 200;
PeriphClkInitStruct.PLLI2S.PLLI2SM = 5;
PeriphClkInitStruct.PLLI2S.PLLI2SR = 2;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
{
Error_Handler();
}
}
lordy lord lord - this is the same bug I had - even with newest IDE 1.7.1 today...
Make SURE to go to RCC and enable the HSE crystal! then both pins will be shown in the clock configuration
