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Finally, the last segment enables/disables peripheral clocks:

CLK_PeripheralClockConfig(CLK_PERIPHERAL_SPI, DISABLE);

CLK_PeripheralClockConfig(CLK_PERIPHERAL_I2C, DISABLE);

CLK_PeripheralClockConfig(CLK_PERIPHERAL_ADC, DISABLE);

CLK_PeripheralClockConfig(CLK_PERIPHERAL_AWU, DISABLE);

CLK_PeripheralClockConfig(CLK_PERIPHERAL_UART1, DISABLE);

CLK_PeripheralClockConfig(CLK_PERIPHERAL_TIMER1, DISABLE);

CLK_PeripheralClockConfig(CLK_PERIPHERAL_TIMER2, DISABLE);

CLK_PeripheralClockConfig(CLK_PERIPHERAL_TIMER4, DISABLE);

This segment is very important and should always be rechecked. Different chips have different internal

hardware peripheral and so this segment will be different. For instance, STM8S105 has no UART1

module but it has UART2 instead. Research which hardware are available in your target micro and

then code this segment. I ended up with several wasted hours of finding trouble in various cases only

to find that I didn’t enable the required hardware.

Configuring Similar Stuffs Quickly

Sometimes you may end up doing the same stuff over and over again while you could have done it

simply with one or two lines of code. For example, in the LCD library, the GPIOs that connect with the

LCD share the same configurations. All are fast push-pull outputs.

GPIO_Init(LCD_PORT, LCD_RS, GPIO_MODE_OUT_PP_HIGH_FAST);

GPIO_Init(LCD_PORT, LCD_EN, GPIO_MODE_OUT_PP_HIGH_FAST);

GPIO_Init(LCD_PORT, LCD_DB4, GPIO_MODE_OUT_PP_HIGH_FAST);

GPIO_Init(LCD_PORT, LCD_DB5, GPIO_MODE_OUT_PP_HIGH_FAST);

GPIO_Init(LCD_PORT, LCD_DB6, GPIO_MODE_OUT_PP_HIGH_FAST);

GPIO_Init(LCD_PORT, LCD_DB7, GPIO_MODE_OUT_PP_HIGH_FAST);

This can be done in a more simplistic manner with just one line of code:

GPIO_MODE_OUT_PP_HIGH_FAST);

As you can see it is just a bunch of logical OR operation. The same method is applicable for other

peripherals that share the same initialization function.

Some Stuffs About Cosmic C and SPL

• Functions, variables and definitions in Cosmic C are case sensitive.

• Functions with no arguments must not have empty argument areas. For example, you

cannot write:

void setup ();

You should write it as:

void setup (void);

STMicroelectronics STM8 User Manual

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