Embedded system
m-jaz
main_lab2.zipLab2_demo_s15.s
; ; EECE 237 S15 ; Lab #2 Demo Code.s File ; AREA Lab2, CODE, READONLY ;ENTRY EXPORT binary_disp EXPORT hex_disp EXTERN LCD_write ;------------------------------------------------------------------------------------------------ ; binary_disp ; ; Displays the binary representation of the 16 bit value passed as a parameter ; on the 2nd row of the LCD screen (using call s C function LCD_write) ; binary_disp PROC PUSH {R4-R7} ; Save R5 since we modify it MOV R5, #15 ; Loop control variable loop MOV R0, #1 ; Row = 1 means second row MOV R1, R5 ; Column MOV R2, #'0' ; 0 to be written PUSH {R0-R6, LR} BL LCD_write ; Write the character to the LCD POP {R0-R6, LR} SUBS R5, R5, #1 ; If count < 16, keep writing BGE loop POP {R4-R7} ; Restore R5 MOV R0, #42 ; totally fake return value BX LR ; return ENDP ;------------------------------------------------------------------------------------------------ ; hex_display ; ; Displays the hex representation of the 16 bit value passed as a parameter ; on the 1st row of the LCD screen starting at column 11(using call s C function LCD_write) ; hex_disp PROC PUSH {R4-R7} ; Save R5 since we modify it MOV R5, #4 ; Loop control variable MOV R0, #0 ; Row = 0 means first row MOV R1, #11 ; Column MOV R2, #'A' ; Poor man's ASCII conversion - A..F hloop ADD R2, R2, #1 hwrite PUSH {R0-R6, LR} BL LCD_write ; Write the character to the LCD POP {R0-R6, LR} ADD R1, R1, #1 SUBS R5, R5, #1 ; If count < 5, keep writing BGE hloop POP {R4-R7} ; Restore R5 BX LR ; return ENDP END
__MACOSX/._Lab2_demo_s15.s
main_Lab2_S15.c
// // 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); } }
