Posted on May 17, 2011 at 13:04So I have been trying to get the HSI clock as the MCO and output it on pin#67, PA8. I am using a STM32F103 VB chip.Following is my code for it.
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
RCC_MCOConfig(RCC_MCO_HSI);
I can see in my RCC_CCR that my HSI is on and stable/ready. Also on executing the code I can see in my register that HSI is used as MCO source.
When I try to see the signal on a scope, the HSI clock is not outputted on pin PA8 #67.
I have the same issue with RTC, I am using the LSE clock 32 Khz to output on pin#7, PC13-Tamper RTC. Again I can see in my registers as I step through the following code that the LSE is on, LSE is selected as RTC clock.
/* Enable PWR and BKP clocks */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);
/* Allow access to BKP Domain */
PWR_BackupAccessCmd(ENABLE);
/* Reset Backup Domain */
BKP_DeInit();
/* Enable LSE */
RCC_LSEConfig(RCC_LSE_ON);
/* Wait till LSE is ready */
while (RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET)
{}
/* Select LSE as RTC Clock Source */
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);
/* Enable RTC Clock */
RCC_RTCCLKCmd(ENABLE);
/* Wait for RTC registers synchronization */
RTC_WaitForSynchro();
I am using both clocks to clock my CPLD ( they are already routed to the CPLD clock pins). Any recommendations or troubleshooting tips would be
really appreciated.
