Assembly Language Functions, embaded system, EECE 237
h2o
main_lab2_s15.c.docx//
// EECE 237 S15
// Lab #2 main C File
// (Assumes I2C LCD connected...)
//
//includes for the project
#include "stm32F30x.h"
#include "STM32f3_discovery.h"
#include "stm32f30x_gpio.h"
#include "stm32f30x_i2c.h"
#include "main.h"
#include "stdio.h"
#include "string.h"
RCC_ClocksTypeDef RCC_Clocks;
GPIO_InitTypeDef GPIO_InitStructure;
void IO_Init(void);
void I2C_init(void);
void I2C2_init(void);
void LCD_write(int,int, char);
void LCD_clear(void);
void LCD_contrast(int); // Contrast level = 1..50
void LCD_backlight(int); // Backlight level = 1..8
void Delay(uint32_t nTime);
extern int binary_disp(int); // Function prototype for Assembly Language function
extern void hex_disp(int); // Function prototype for Assembly Language function
unsigned int tick_count = 0;
char strDisp[20] ;
volatile int ButtonPressed = 0;
int random = 0;
static __IO uint32_t TimingDelay;
char message[16];
char ready_msg[] = "Ready:";
int main(void) {
int i, j = 0;
int num_ones;
IO_Init();
I2C2_init();
while(I2C_GetFlagStatus(I2C2, I2C_ISR_BUSY) != RESET);
LCD_contrast(35);
LCD_backlight(2);
LCD_clear();
for (i=0; i < strlen(ready_msg); i++) // Write "Ready:"
LCD_write(0, i, ready_msg[i]);
while (!ButtonPressed);
ButtonPressed = 0;
GPIOE->ODR = 0;
while(1){
random = (tick_count % 65536); // Get random(ish) number
sprintf(message, "Num=%5i", random);
for (i=0; i < strlen(message); i++)
LCD_write(0, i, message[i]); // Display number on 1st line of display
hex_disp(random); // Call assembly Language Function
num_ones = binary_disp(random); // Call assembly Language Function (note return value)
while (!ButtonPressed);
ButtonPressed = 0;
LCD_clear();
sprintf(message, " %5i contains",random);
for (i=0; i < strlen(message); i++)
LCD_write(0, i, message[i]); // Display number on 1st line of display
sprintf(message, " %2i Ones ",num_ones);
for (i=0; i < strlen(message); i++)
LCD_write(1, i, message[i]); // Display number on 1st line of display
GPIOE->ODR &= 0x8000 >> j++;
j %= 8;
while (!ButtonPressed);
ButtonPressed = 0;
LCD_clear();
}
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void IO_Init() {
EXTI_InitTypeDef EXTI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
/* SysTick end of count event each 1ms */
RCC_GetClocksFreq(&RCC_Clocks);
SysTick_Config(RCC_Clocks.HCLK_Frequency / 1000);
/* GPIOE Periph clock enable */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOE, ENABLE);
/* Configure PE14 and PE15 in output pushpull mode */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15 | GPIO_Pin_14 | GPIO_Pin_13 | GPIO_Pin_12
| GPIO_Pin_11| GPIO_Pin_10| GPIO_Pin_9| GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //GPIO_PuPd_NOPULL
GPIO_Init(GPIOE, &GPIO_InitStructure);
/* Enable GPIOA clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
/* Configure PA0 pin as input floating */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Enable SYSCFG clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
/* Connect EXTI0 Line to PA0 pin */
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);
/* Configure EXTI0 line */
EXTI_InitStructure.EXTI_Line = EXTI_Line0;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
/* Enable and set EXTI0 Interrupt to the lowest priority */
NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void I2C2_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
I2C_InitTypeDef I2C_InitStructure;
RCC_I2CCLKConfig(RCC_I2C2CLK_SYSCLK);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_4);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_4);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_Init(GPIOA, &GPIO_InitStructure);
I2C_DeInit(I2C2);
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;
I2C_InitStructure.I2C_DigitalFilter = 0x00;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_Timing = 0xC062121F;
I2C_Init(I2C2, &I2C_InitStructure);
I2C_Cmd(I2C2, ENABLE);
}
void LCD_write(int row, int col, char data) {
// Move to sepcified row, col
I2C_TransferHandling(I2C2, 0x50 , 3, I2C_SoftEnd_Mode, I2C_Generate_Start_Write);
while(I2C_GetFlagStatus(I2C2, I2C_ISR_TXIS) == RESET);
I2C_SendData(I2C2, 0xFE);
while(I2C_GetFlagStatus(I2C2, I2C_ISR_TXIS) == RESET);
I2C_SendData(I2C2, 0x45);
while(I2C_GetFlagStatus(I2C2, I2C_ISR_TXIS) == RESET);
if (!row) // if row == 0
I2C_SendData(I2C2, col);
else // else row asumed to be 1
I2C_SendData(I2C2, (0x40 + col));
I2C_TransferHandling(I2C2, 0x50 , 1, I2C_SoftEnd_Mode, I2C_Generate_Start_Write);
while(I2C_GetFlagStatus(I2C2, I2C_ISR_TXIS) == RESET);
I2C_SendData(I2C2, data);
}
//
// Set LCD Contrast - Level should be 1..50 (Seems to work best if > 35)
//
void LCD_contrast(int level) {
I2C_TransferHandling(I2C2, 0x50 , 3, I2C_SoftEnd_Mode, I2C_Generate_Start_Write);
while(I2C_GetFlagStatus(I2C2, I2C_ISR_TXIS) == RESET);
I2C_SendData(I2C2, 0xFE);
while(I2C_GetFlagStatus(I2C2, I2C_ISR_TXIS) == RESET);
I2C_SendData(I2C2, 0x52);
while(I2C_GetFlagStatus(I2C2, I2C_ISR_TXIS) == RESET);
I2C_SendData(I2C2, level);
Delay(20);
}
//
// Set LCD Backlight - Level should be 1..8 (Seems to work best if > 1)
//
void LCD_backlight(int level) {
I2C_TransferHandling(I2C2, 0x50 , 3, I2C_SoftEnd_Mode, I2C_Generate_Start_Write);
while(I2C_GetFlagStatus(I2C2, I2C_ISR_TXIS) == RESET);
I2C_SendData(I2C2, 0xFE);
while(I2C_GetFlagStatus(I2C2, I2C_ISR_TXIS) == RESET);
I2C_SendData(I2C2, 0x53);
while(I2C_GetFlagStatus(I2C2, I2C_ISR_TXIS) == RESET);
I2C_SendData(I2C2, level);
Delay(20);
}
void LCD_clear() {
I2C_TransferHandling(I2C2, 0x50 , 2, I2C_SoftEnd_Mode, I2C_Generate_Start_Write);
while(I2C_GetFlagStatus(I2C2, I2C_ISR_TXIS) == RESET);
I2C_SendData(I2C2, 0xFE);
while(I2C_GetFlagStatus(I2C2, I2C_ISR_TXIS) == RESET);
I2C_SendData(I2C2, 0x51);
Delay(20);
}
/**
* @brief Inserts a delay time.
* @param nTime: specifies the delay time length, in milliseconds.
* @retval None
*/
void Delay(uint32_t nTime)
{
TimingDelay = nTime;
while(TimingDelay != 0);
}
/**
* @brief Decrements the TimingDelay variable.
* @param None
* @retval None
*/
void TimingDelay_Decrement(void)
{
if (TimingDelay != 0x00)
{
TimingDelay--;
}
}
void SysTick_Handler(void)
{
TimingDelay_Decrement();
tick_count++;
}
void EXTI0_IRQHandler(void)
{
if ((EXTI_GetITStatus(USER_BUTTON_EXTI_LINE) == SET)&&(STM_EVAL_PBGetState(BUTTON_USER) != RESET))
{
GPIOE->ODR ^= 0xFF00;
ButtonPressed = 1;
/* Clear the EXTI line 0 pending bit */
EXTI_ClearITPendingBit(USER_BUTTON_EXTI_LINE);
}
}
