i have a small board (commercial product) which uses the STM32F100C4, it has LCD a couple of buttons, 2 uarts and a couple of LEDs. The actual product is coded in uVision but it has all the basics for simple testing so i thought lets try the mikroC ARM compiler out on it.
The LCD is in 4bit mode with R/W (this is simply defined and driven low to fit with mE LCD library), the main thing to take from this quick example is that PORTB PIN4 is a JTAG pin by default and so there are a couple of things that need to be done to use this pin as a gpio. Alternate function switch and alternate function clock needs to be turned on.
taking the LCD example supplied with the compiler and making a couple of minor changes...
Code: Select all
/*
* Project name:
Lcd_Custom_Test (Simple demonstration of the LCD Library functions)
* Copyright:
(c) mikroElektronika, 2009.
* Revision History:
20091030:
- Initial release;
* Description:
This is a simple demonstration of LCD library functions. LCD is first
initialized (PORB, 4-bit data interface, default pin settings), then some
text is written at the first and the second row.
* Test configuration:
MCU: STM32F100C4
Oscillator: HSI noPLL, 8.000MHz
Ext. Modules: ac:LCD
on portB
SW: mikroC PRO for ARM
* NOTES:
Using PORTB to drive LCD, MCU PIN PB4 is a JTAG pin be default so
Alternate function needs to be enabled and APB2PeriphAFIO clock needs
to be enabled.
*/
// LCD module connections
sbit LCD_RS at GPIOB_ODR.B2;
sbit LCD_EN at GPIOB_ODR.B0;
sbit LCD_D4 at GPIOB_ODR.B4; // alternate pin function
sbit LCD_D5 at GPIOB_ODR.B5;
sbit LCD_D6 at GPIOB_ODR.B6;
sbit LCD_D7 at GPIOB_ODR.B7;
sbit LCDRW at GPIOB_ODR.B1;
// End LCD module connections
/*************************************************************************************************
* Init MCU function
**************************************************************************************************/
void InitMCU(){
// setup LCD RW pin as output and drive low
LCDRW = 0;
GPIO_Config(&GPIOB_BASE, _GPIO_PINMASK_1, _GPIO_CFG_DIGITAL_OUTPUT);
}
char txt1[] = "mikroElektronika";
char txt2[] = "STM32F100C4";
char txt3[] = "Lcd4bit";
char txt4[] = "example";
char i; // Loop variable
void Move_Delay() { // Function used for text moving
Delay_ms(750); // You can change the moving speed here
}
void main(){
InitMCU();
AFIOEN_bit = 1; //APB2 AFIO clock
SWJ_CFG0_bit = 1; // PB4 alternate function enable //AFIO_MAPR.B24 = 1;
Lcd_Init(); // Initialize LCD
Lcd_Cmd(_LCD_CLEAR); // Clear display
Lcd_Cmd(_LCD_CURSOR_OFF); // Cursor off
Lcd_out(1,1,"Hello");
Delay_ms(2000);
Lcd_Cmd(_LCD_CLEAR); // Clear display
Lcd_Out(1,6,txt3); // Write text in first row
Lcd_Out(2,6,txt4); // Write text in second row
Delay_ms(2000);
Lcd_Cmd(_LCD_CLEAR); // Clear display
Lcd_Out(1,1,txt1); // Write text in first row
Lcd_Out(2,4,txt2); // Write text in second row
Delay_ms(2000);
// Moving text
for(i=0; i<4; i++) { // Move text to the right 4 times
Lcd_Cmd(_LCD_SHIFT_RIGHT);
Move_Delay();
}
while(1) { // Endless loop
for(i=0; i<7; i++) { // Move text to the left 7 times
Lcd_Cmd(_LCD_SHIFT_LEFT);
Move_Delay();
}
for(i=0; i<7; i++) { // Move text to the right 7 times
Lcd_Cmd(_LCD_SHIFT_RIGHT);
Move_Delay();
}
}
}
