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A real N32G031 session: GPIOA clocks, DHT11 on the wire, click-to-flash.

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N32G031_OLED_DHT11-mainn32g031 saved to disk

N32G031_OLED_DHT11-main

>Linked to disk · ~/Projects/N32G031_OLED_DHT11

flash ok · 240 bytes · 0.8s · OpenOCD n32g031

Files

src

7

misc.c

n32g031_it.c

oled.c

system_n32g031.c

utils.c

drivers

51

filemain

2

inc

10

Tools

Hardware

2

Toolchain

1

Cloud

3

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4

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main.c✕

src/main.c

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1#include "n32g031.h"

2#include "n32g031_gpio.h"

3#include "n32g031_rcc.h"

4#include "core_cm0.h"

5#include "dht11.h"

6#include "oled.h"

7#include "utils.h"

8#include <stdio.h>

9

10// --- ADDED: LED Initialization ---

11void leds_init(void)

12{

13 // Enable GPIOA clock (Bit 2 in APB2PCLKEN)

14 RCC->APB2PCLKEN |= (1U << 2);

15

16 // Configure PA2 (Yellow), PA3 (Green), PA4 (Red) as Output (01)

17 GPIOA->PMODE &= ~((3U << 4) | (3U << 6) | (3U << 8));

18 GPIOA->PMODE |= ((1U << 4) | (1U << 6) | (1U << 8));

19

20 // Configure as Push-Pull (0)

21 GPIOA->POTYPE &= ~((1U << 2) | (1U << 3) | (1U << 4));

22

23 // Configure No Pull-up/Pull-down (00)

24 GPIOA->PUPD &= ~((3U << 4) | (3U << 6) | (3U << 8));

25

26 // Turn all LEDs OFF initially (write 1 to Port Bit Clear register)

27 GPIOA->PBC = (1U << 2) | (1U << 3) | (1U << 4);

28}

29// ---------------------------------

30

31int main(void)

32{

33 uint8_t current_temp = 0;

34 uint8_t current_humi = 0;

35

36 uint8_t last_temp = 255;

37 uint8_t last_humi = 255;

38 uint8_t was_error = 1;

39

40 uint8_t error_count = 0;

41

42 char buffer[20];

43

44 SystemInit();

45 SystemCoreClockUpdate();

46

47 leds_init(); // Initialize the 3 LEDs

48

49 delay_ms(500);

50 OLED_Init();

51 OLED_Clear();

52 DHT11_Init();

53

54 OLED_ShowString(10, 24, "System Ready", 16);

55 delay_ms(1500);

56

57 OLED_Clear();

58

59 while (1)

60 {

61 if (DHT11_Read_Data(&current_temp, &current_humi) == 1)

62 {

63 error_count = 0;

64

65 if (was_error)

66 {

67 OLED_Clear();

68 OLED_ShowString(0, 0, "Temp: ", 8);

69 OLED_ShowString(0, 32, "Humidity: ", 8);

70 was_error = 0;

71 last_temp = 255;

72 last_humi = 255;

73 }

74

75 if (current_temp != last_temp)

76 {

77 sprintf(buffer, "%02d C ", current_temp);

78 OLED_ShowString(0, 12, buffer, 16);

79 OLED_ShowString(24, 12, "o", 8);

80 last_temp = current_temp;

81 }

82

83 if (current_humi != last_humi)

84 {

85 sprintf(buffer, "%02d %% ", current_humi);

86 OLED_ShowString(0, 44, buffer, 16);

87 last_humi = current_humi;

88 }

89

90 // --- ADDED: LED Logic based on Humidity ---

91 if (current_humi < 40)

92 {

93 GPIOA->PBSC = (1U << 3); // Green ON (PA3)

94 GPIOA->PBC = (1U << 2) | (1U << 4); // Yellow, Red OFF

95 }

96 else if (current_humi >= 40 && current_humi <= 60)

97 {

98 GPIOA->PBSC = (1U << 2); // Yellow ON (PA2)

99 GPIOA->PBC = (1U << 3) | (1U << 4); // Green, Red OFF

100 }

101 else

102 {

103 GPIOA->PBSC = (1U << 4); // Red ON (PA4)

104 GPIOA->PBC = (1U << 2) | (1U << 3); // Green, Yellow OFF

105 }

106 // ------------------------------------------

107 }

108 else

109 {

110 error_count++;

111

112 if (error_count >= 3)

113 {

114 if (!was_error)

115 {

116 OLED_Clear();

117 was_error = 1;

118 }

119 OLED_ShowString(0, 0, "Sensor Error! ", 16);

120 OLED_ShowString(0, 24, "Check Wiring. ", 16);

121

122 // Optional: Turn off all LEDs on error

123 GPIOA->PBC = (1U << 2) | (1U << 3) | (1U << 4);

124 }

125 }

126

127 delay_ms(2000);

128 }

129}

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Starter, Pro and Learning kits share the same Cortex-M0+ board. Rotate a kit, then order from the form below.

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