initial commit

2022-11-11 08:00:44 +01:00
commit 4344c1c914
5 changed files with 909 additions and 0 deletions
@@ -0,0 +1,43 @@
+#include <reg_stm32f4xx.h>
+#include <stdint.h>
+
+void adc_init(void)
+{
+    // Clock configuration
+    RCC->APB2ENR |= 0x00000400;
+    RCC->APB1ENR |= 0x00000020;
+
+    // Analog pin configuration
+    GPIOF->MODER |= 0x00003000;
+
+    // ADC configuration
+    ADC3->CR1 |= 0x02000000;                                      // Resolution
+                                                                  // -> 8 Bit,
+                                                                  // scan mode
+                                                                  // -> disabled
+    ADC3->CR2 |= 0x00000002;                                      // Continous
+                                                                  // conversion
+                                                                  // mode ->
+                                                                  // enabled
+
+    // Enable ADC conversion
+    ADC3->CR2 |= 0x00000001;                                  // ADC3 enable
+
+    // Select the channel to be read from
+    ADC3->SMPR2 |= 0x00006000;                          // Channel 4 sampling
+                                                          // time -> 144 cycles
+    ADC3->SQR3 |= 0x00000004;                               // Channel 4 rank
+                                                              // -> 1 (?)
+}
+
+uint8_t adc_get_value(void)
+{
+    // Start the conversion
+    ADC3->CR2 |= 0x40000000;
+
+    // Wait till conversion is finished
+    while (!ADC3->SR & 0x00000002) ;
+
+    // Return the converted data
+    return (uint8_t)ADC3->DR & 0x000000ff;
+}
@@ -0,0 +1,117 @@
+; ------------------------------------------------------------------
+; --  _____       ______  _____                                    -
+; -- |_   _|     |  ____|/ ____|                                   -
+; --   | |  _ __ | |__  | (___    Institute of Embedded Systems    -
+; --   | | | '_ \|  __|  \___ \   Zurich University of             -
+; --  _| |_| | | | |____ ____) |  Applied Sciences                 -
+; -- |_____|_| |_|______|_____/   8401 Winterthur, Switzerland     -
+; ------------------------------------------------------------------
+; --
+; -- main.s
+; --
+; -- CT1 P08 "Strukturierte Codierung" mit Assembler
+; --
+; -- $Id: struct_code.s 3787 2016-11-17 09:41:48Z kesr $
+; ------------------------------------------------------------------
+;Directives
+        PRESERVE8
+        THUMB
+
+; ------------------------------------------------------------------
+; -- Address-Defines
+; ------------------------------------------------------------------
+; input
+ADDR_DIP_SWITCH_7_0       EQU        0x60000200
+ADDR_BUTTONS              EQU        0x60000210
+
+; output
+ADDR_LED_31_0             EQU        0x60000100
+ADDR_7_SEG_BIN_DS3_0      EQU        0x60000114
+ADDR_LCD_COLOUR           EQU        0x60000340
+ADDR_LCD_ASCII            EQU        0x60000300
+ADDR_LCD_ASCII_BIT_POS    EQU        0x60000302
+ADDR_LCD_ASCII_2ND_LINE   EQU        0x60000314
+
+
+; ------------------------------------------------------------------
+; -- Program-Defines
+; ------------------------------------------------------------------
+; value for clearing lcd
+ASCII_DIGIT_CLEAR        EQU         0x00000000
+LCD_LAST_OFFSET          EQU         0x00000028
+
+; offset for showing the digit in the lcd
+ASCII_DIGIT_OFFSET        EQU        0x00000030
+
+; lcd background colors to be written
+DISPLAY_COLOUR_RED        EQU        0
+DISPLAY_COLOUR_GREEN      EQU        2
+DISPLAY_COLOUR_BLUE       EQU        4
+
+; ------------------------------------------------------------------
+; -- myConstants
+; ------------------------------------------------------------------
+        AREA myConstants, DATA, READONLY
+; display defines for hex / dec
+DISPLAY_BIT               DCB        "Bit "
+DISPLAY_2_BIT             DCB        "2"
+DISPLAY_4_BIT             DCB        "4"
+DISPLAY_8_BIT             DCB        "8"
+        ALIGN
+
+; ------------------------------------------------------------------
+; -- myCode
+; ------------------------------------------------------------------
+        AREA myCode, CODE, READONLY
+        ENTRY
+
+        ; imports for calls
+        import adc_init
+        import adc_get_value
+
+main    PROC
+        export main
+        ; 8 bit resolution, cont. sampling
+        BL         adc_init 
+        BL         clear_lcd
+
+main_loop
+; STUDENTS: To be programmed
+
+
+
+
+; END: To be programmed
+        B          main_loop
+        
+clear_lcd
+        PUSH       {R0, R1, R2}
+        LDR        R2, =0x0
+clear_lcd_loop
+        LDR        R0, =ADDR_LCD_ASCII
+        ADDS       R0, R0, R2                       ; add index to lcd offset
+        LDR        R1, =ASCII_DIGIT_CLEAR
+        STR        R1, [R0]
+        ADDS       R2, R2, #4                       ; increas index by 4 (word step)
+        CMP        R2, #LCD_LAST_OFFSET             ; until index reached last lcd point
+        BMI        clear_lcd_loop
+        POP        {R0, R1, R2}
+        BX         LR
+
+write_bit_ascii
+        PUSH       {R0, R1}
+        LDR        R0, =ADDR_LCD_ASCII_BIT_POS 
+        LDR        R1, =DISPLAY_BIT
+        LDR        R1, [R1]
+        STR        R1, [R0]
+        POP        {R0, R1}
+        BX         LR
+
+        ENDP
+        ALIGN
+
+
+; ------------------------------------------------------------------
+; End of code
+; ------------------------------------------------------------------
+        END