stm8s cco flag never set

Question

I have a discovery stm8s003k board and when I tested a program for cco capability it seems cco will never be stable and program always remain in line: while(CLK_GetFlagStatus(CLK_FLAG_CCORDY) == FALSE); code and more explain is in detail.

I tested it with below code and I even change pre-scalers for lower and higher frequency, I also check it with external crystal (and change the code) but it remains in while(CLK_GetFlagStatus(CLK_FLAG_CCORDY) == FALSE); forever.

When I debug the code and step over in debugger environment after the program enables CCOEN bit the output will start and frequency is just true. but both flags CCORDY and CCOBSY remains set (CCOR=0x69 in debugger) and it always remain in while loop. My code is:

#include "STM8S.h"
#define LED_pin                      GPIO_PIN_0
#define LED_port                     GPIOD

void setup(void);
void clock_setup(void);
void GPIO_setup(void);

void main(void)
{
  setup();
  GPIO_WriteLow(LED_port, LED_pin);
  while(TRUE){};
}

void setup(void)
{
  clock_setup();
  GPIO_setup();
}

void clock_setup(void)
{
  CLK_DeInit();
  CLK_HSECmd(DISABLE);
  CLK_LSICmd(DISABLE);
  CLK_HSICmd(ENABLE);

  while(CLK_GetFlagStatus(CLK_FLAG_HSIRDY) == FALSE);

  CLK_ClockSwitchCmd(ENABLE);
  CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV8);
  CLK_SYSCLKConfig(CLK_PRESCALER_CPUDIV4);
  CLK_ClockSwitchConfig(CLK_SWITCHMODE_AUTO, CLK_SOURCE_HSI,
  DISABLE, CLK_CURRENTCLOCKSTATE_ENABLE);
  CLK_PeripheralClockConfig(CLK_PERIPHERAL_I2C, DISABLE);
  CLK_PeripheralClockConfig(CLK_PERIPHERAL_SPI, DISABLE);
  CLK_PeripheralClockConfig(CLK_PERIPHERAL_UART1, DISABLE);
  CLK_PeripheralClockConfig(CLK_PERIPHERAL_AWU, DISABLE);
  CLK_PeripheralClockConfig(CLK_PERIPHERAL_ADC, DISABLE);
  CLK_PeripheralClockConfig(CLK_PERIPHERAL_TIMER1, DISABLE);
  CLK_PeripheralClockConfig(CLK_PERIPHERAL_TIMER2, DISABLE);
  CLK_PeripheralClockConfig(CLK_PERIPHERAL_TIMER4, DISABLE);
  CLK_CCOConfig(CLK_OUTPUT_CPU);
  CLK_CCOCmd(ENABLE);

  while(CLK_GetFlagStatus(CLK_FLAG_CCORDY) == FALSE);
}

void GPIO_setup(void)
{                              
  GPIO_DeInit(LED_port);
  GPIO_Init(LED_port, LED_pin, GPIO_MODE_OUT_OD_HIZ_FAST);
}

stm8s cco flag never set

0 Answers