Posted on May 17, 2011 at 13:50I have found some differences in the way that the clock domains have been initialised between the working version and the V3.3.
When I forced the :
SYSCLK_Frequency
HCLK_Frequency
PCLK1_Frequency
PCLK2_Frequency
ADCCLK_Frequency
In the serial initialisation then the serial worked. The bit I dont understand about this is that the clocks are setup, well at least I think they are, maybe this is where its going wrong:
void Clk_Init (void)
{
// 1. Cloking the controller from internal HSI RC (8 MHz)
RCC_HSICmd(ENABLE);
// wait until the HSI is ready
while(RCC_GetFlagStatus(RCC_FLAG_HSIRDY) == RESET);
RCC_SYSCLKConfig(RCC_SYSCLKSource_HSI);
// 2. Enable ext. high frequency OSC
RCC_HSEConfig(RCC_HSE_ON);
// wait until the HSE is ready
while(RCC_GetFlagStatus(RCC_FLAG_HSERDY) == RESET);
// 3. Init PLL
RCC_PLLConfig(RCC_PLLSource_HSE_Div1,RCC_PLLMul_9); // 72MHz
// RCC_PLLConfig(RCC_PLLSource_HSE_Div2,RCC_PLLMul_9); // 72MHz
RCC_PLLCmd(ENABLE);
// wait until the PLL is ready
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);
// 4. Set system clock divders
RCC_USBCLKConfig(RCC_USBCLKSource_PLLCLK_1Div5);
RCC_ADCCLKConfig(RCC_PCLK2_Div8);
RCC_PCLK2Config(RCC_HCLK_Div1);
RCC_PCLK1Config(RCC_HCLK_Div2);
RCC_HCLKConfig(RCC_SYSCLK_Div1);
// Flash 1 wait state
*(vu32 *)0x40022000 = 0x12;
// 5. Clock system from PLL
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
}
The values looked correct when they were initialised but when the USART code queried the clocks with :
RCC_GetClocksFreq()
It got returned only the SYSCLK_Frequency and all other frequencies were 0.
This is where my problem is. It looked as though the APBAHBPrescTable entries were wrong. I will have another look at it today.
Thanks for the replies.
