add untested driver prototype for DHT11 humidity and temperature sensor
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30
Core/Inc/dht11.h
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30
Core/Inc/dht11.h
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@ -0,0 +1,30 @@
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#ifndef __DHT11
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#define __DHT11
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#define SKIP_LOW while (!(GPIOD->IDR & 0x0800)) {}
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#define SKIP_HIGH while (GPIOD->IDR & 0x0800) {}
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#define FILL_REGISTER do { \
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for (int i = 0; i < 8; i++) { \
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read_register <<= 1; \
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SKIP_LOW; \
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read_register |= dht11_measure_high_duration(); \
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} } while (0)
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struct SysTickConfig {
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uint32_t ctrl;
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uint32_t load;
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uint32_t val;
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};
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struct DHT11_Data {
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uint8_t humid_integral;
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uint8_t humid_decimal;
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uint8_t temp_integral;
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uint8_t temp_decimal;
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uint8_t crc;
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};
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void dht11_show_both(void);
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#endif
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98
Core/Src/dht11.c
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98
Core/Src/dht11.c
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@ -0,0 +1,98 @@
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#include "main.h"
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#include "generic_macros.h"
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#include "dht11.h"
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static struct SysTickConfig stc;
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static uint32_t *systick_base = (uint32_t *) SysTick_BASE;
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static void wait(uint32_t wait_us)
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{
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int target_time = *(systick_base+8);
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target_time -= wait_us << 4;
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while (*(systick_base+8) > target_time) {}
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}
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static void dht11_save_systick_state(void)
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{
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stc.ctrl = *(systick_base + 0);
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stc.load = *(systick_base + 4);
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stc.val = *(systick_base + 8);
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}
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static void dht11_load_systick_state(void)
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{
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*(systick_base + 4) = stc.load;
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*(systick_base + 8) = stc.val;
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*(systick_base + 0) = stc.ctrl;
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}
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static void dht11_init_systick(void)
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{
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dht11_save_systick_state();
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*(systick_base + 0) = 0x5; // disable /8 prescaler, no interrupts, enable counting
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*(systick_base + 4) = 0xFFFFFF; // load largest possible value
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// verify value load
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if (*(systick_base + 8) == 0)
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PANIC(0x4000);
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}
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static size_t dht11_measure_high_duration(void)
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{
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int current_time = *(systick_base+8);
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SKIP_HIGH;
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// elapsed_time > 49us ? 1 : 0
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return (current_time - *(systick_base+8)) > (49 << 4);
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}
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static void dht11_read_value(struct DHT11_Data *data)
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{
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dht11_init_systick();
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register uint8_t read_register = 0;
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GPIOD->BSRR = GPIO_PIN_11; // enable DHT11
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wait(50000); // hold HIGH for 50 ms
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GPIOD->BSRR = GPIO_PIN_11 << 16; // start signal
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wait(30000); // hold it for 30 ms
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GPIOD->BSRR = GPIO_PIN_11; // pull up, DHT will now take control over the connection
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// switch GPIOD 11 to input mode
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GPIOD->MODER &= 0xFF3FFFFF;
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// read transmission start sequence from DHT11
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SKIP_HIGH;
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SKIP_LOW;
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SKIP_HIGH;
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// read humidity integral
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FILL_REGISTER;
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data->humid_integral = read_register;
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// read humidity decimal
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FILL_REGISTER;
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data->humid_decimal = read_register;
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// read temperature integral
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FILL_REGISTER;
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data->temp_integral = read_register;
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// read temperature decimal
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FILL_REGISTER;
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data->temp_decimal = read_register;
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// read crc
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FILL_REGISTER;
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data->crc = read_register;
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dht11_load_systick_state();
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}
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void dht11_show_both(void)
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{
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struct DHT11_Data data;
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dht11_read_value(&data);
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}
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@ -25,6 +25,7 @@
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#include "generic_macros.h"
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#include "lcd.h"
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#include "external_temp.h"
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#include "dht11.h"
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/* USER CODE END Includes */
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@ -49,6 +50,7 @@ ADC_HandleTypeDef hadc1;
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/* USER CODE BEGIN PV */
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void ((*executors[])(void)) = {
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dht11_show_both,
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external_temp_show_celsius,
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external_temp_show_fahrenheit
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};
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@ -104,6 +106,7 @@ int main(void)
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GPIOD->ODR = 0xF000;
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display_init();
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HAL_Delay(1000);
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GPIOD->ODR = 0x0000;
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/* USER CODE END 2 */
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@ -236,7 +239,8 @@ static void MX_GPIO_Init(void)
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|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15, GPIO_PIN_RESET);
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/*Configure GPIO pin Output Level */
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HAL_GPIO_WritePin(GPIOD, GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15, GPIO_PIN_RESET);
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HAL_GPIO_WritePin(GPIOD, GPIO_PIN_11|GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14
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|GPIO_PIN_15, GPIO_PIN_RESET);
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/*Configure GPIO pin : PA0 */
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GPIO_InitStruct.Pin = GPIO_PIN_0;
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@ -253,8 +257,10 @@ static void MX_GPIO_Init(void)
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GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
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HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);
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/*Configure GPIO pins : PD12 PD13 PD14 PD15 */
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GPIO_InitStruct.Pin = GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15;
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/*Configure GPIO pins : PD11 PD12 PD13 PD14
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PD15 */
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GPIO_InitStruct.Pin = GPIO_PIN_11|GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14
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|GPIO_PIN_15;
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GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
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GPIO_InitStruct.Pull = GPIO_NOPULL;
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GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
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@ -5,6 +5,7 @@
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# Add inputs and outputs from these tool invocations to the build variables
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C_SRCS += \
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../Core/Src/dht11.c \
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../Core/Src/external-temperature.c \
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../Core/Src/external_temp.c \
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../Core/Src/lcd.c \
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@ -16,6 +17,7 @@ C_SRCS += \
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../Core/Src/system_stm32f4xx.c
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OBJS += \
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./Core/Src/dht11.o \
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./Core/Src/external-temperature.o \
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./Core/Src/external_temp.o \
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./Core/Src/lcd.o \
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@ -27,6 +29,7 @@ OBJS += \
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./Core/Src/system_stm32f4xx.o
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C_DEPS += \
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./Core/Src/dht11.d \
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./Core/Src/external-temperature.d \
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./Core/Src/external_temp.d \
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./Core/Src/lcd.d \
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@ -45,7 +48,7 @@ Core/Src/%.o Core/Src/%.su Core/Src/%.cyclo: ../Core/Src/%.c Core/Src/subdir.mk
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clean: clean-Core-2f-Src
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clean-Core-2f-Src:
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-$(RM) ./Core/Src/external-temperature.cyclo ./Core/Src/external-temperature.d ./Core/Src/external-temperature.o ./Core/Src/external-temperature.su ./Core/Src/external_temp.cyclo ./Core/Src/external_temp.d ./Core/Src/external_temp.o ./Core/Src/external_temp.su ./Core/Src/lcd.cyclo ./Core/Src/lcd.d ./Core/Src/lcd.o ./Core/Src/lcd.su ./Core/Src/main.cyclo ./Core/Src/main.d ./Core/Src/main.o ./Core/Src/main.su ./Core/Src/stm32f4xx_hal_msp.cyclo ./Core/Src/stm32f4xx_hal_msp.d ./Core/Src/stm32f4xx_hal_msp.o ./Core/Src/stm32f4xx_hal_msp.su ./Core/Src/stm32f4xx_it.cyclo ./Core/Src/stm32f4xx_it.d ./Core/Src/stm32f4xx_it.o ./Core/Src/stm32f4xx_it.su ./Core/Src/syscalls.cyclo ./Core/Src/syscalls.d ./Core/Src/syscalls.o ./Core/Src/syscalls.su ./Core/Src/sysmem.cyclo ./Core/Src/sysmem.d ./Core/Src/sysmem.o ./Core/Src/sysmem.su ./Core/Src/system_stm32f4xx.cyclo ./Core/Src/system_stm32f4xx.d ./Core/Src/system_stm32f4xx.o ./Core/Src/system_stm32f4xx.su
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-$(RM) ./Core/Src/dht11.cyclo ./Core/Src/dht11.d ./Core/Src/dht11.o ./Core/Src/dht11.su ./Core/Src/external-temperature.cyclo ./Core/Src/external-temperature.d ./Core/Src/external-temperature.o ./Core/Src/external-temperature.su ./Core/Src/external_temp.cyclo ./Core/Src/external_temp.d ./Core/Src/external_temp.o ./Core/Src/external_temp.su ./Core/Src/lcd.cyclo ./Core/Src/lcd.d ./Core/Src/lcd.o ./Core/Src/lcd.su ./Core/Src/main.cyclo ./Core/Src/main.d ./Core/Src/main.o ./Core/Src/main.su ./Core/Src/stm32f4xx_hal_msp.cyclo ./Core/Src/stm32f4xx_hal_msp.d ./Core/Src/stm32f4xx_hal_msp.o ./Core/Src/stm32f4xx_hal_msp.su ./Core/Src/stm32f4xx_it.cyclo ./Core/Src/stm32f4xx_it.d ./Core/Src/stm32f4xx_it.o ./Core/Src/stm32f4xx_it.su ./Core/Src/syscalls.cyclo ./Core/Src/syscalls.d ./Core/Src/syscalls.o ./Core/Src/syscalls.su ./Core/Src/sysmem.cyclo ./Core/Src/sysmem.d ./Core/Src/sysmem.o ./Core/Src/sysmem.su ./Core/Src/system_stm32f4xx.cyclo ./Core/Src/system_stm32f4xx.d ./Core/Src/system_stm32f4xx.o ./Core/Src/system_stm32f4xx.su
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.PHONY: clean-Core-2f-Src
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@ -1,3 +1,4 @@
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"./Core/Src/dht11.o"
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"./Core/Src/external-temperature.o"
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"./Core/Src/external_temp.o"
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"./Core/Src/lcd.o"
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17
test1.ioc
17
test1.ioc
@ -24,10 +24,11 @@ Mcu.Name=STM32F407V(E-G)Tx
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Mcu.Package=LQFP100
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Mcu.Pin0=PA0-WKUP
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Mcu.Pin1=PB1
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Mcu.Pin10=PD13
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Mcu.Pin11=PD14
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Mcu.Pin12=PD15
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Mcu.Pin13=VP_SYS_VS_Systick
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Mcu.Pin10=PD12
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Mcu.Pin11=PD13
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Mcu.Pin12=PD14
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Mcu.Pin13=PD15
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Mcu.Pin14=VP_SYS_VS_Systick
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Mcu.Pin2=PE7
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Mcu.Pin3=PE10
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Mcu.Pin4=PE11
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@ -35,8 +36,8 @@ Mcu.Pin5=PE12
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Mcu.Pin6=PE13
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Mcu.Pin7=PE14
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Mcu.Pin8=PE15
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Mcu.Pin9=PD12
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Mcu.PinsNb=14
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Mcu.Pin9=PD11
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Mcu.PinsNb=15
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Mcu.ThirdPartyNb=0
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Mcu.UserConstants=
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Mcu.UserName=STM32F407VGTx
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@ -58,6 +59,8 @@ PA0-WKUP.Locked=true
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PA0-WKUP.Signal=GPXTI0
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PB1.Locked=true
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PB1.Signal=ADCx_IN9
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PD11.Locked=true
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PD11.Signal=GPIO_Output
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PD12.Locked=true
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PD12.Signal=GPIO_Output
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PD13.Locked=true
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@ -111,7 +114,7 @@ ProjectManager.ToolChainLocation=
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ProjectManager.UAScriptAfterPath=
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ProjectManager.UAScriptBeforePath=
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ProjectManager.UnderRoot=true
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ProjectManager.functionlistsort=1-SystemClock_Config-RCC-false-HAL-false,2-MX_GPIO_Init-GPIO-false-HAL-true
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ProjectManager.functionlistsort=1-SystemClock_Config-RCC-false-HAL-false,2-MX_GPIO_Init-GPIO-false-HAL-true,3-MX_ADC1_Init-ADC1-false-HAL-true
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RCC.AHBFreq_Value=16000000
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RCC.APB1Freq_Value=16000000
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RCC.APB1TimFreq_Value=16000000
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