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[DHT11] minor bugfixes, minor speed improvements 

- fix timeout awaiting, add more time
- move SKIP_LOW into dht11_measure_high_duration function to execute the function call before the PD11 line goes high, thus increasing the precision of signal length measurement
This commit is contained in:
ІО-23 Шмуляр Олег 2025-04-19 13:38:11 +03:00
parent 4b467f6701
commit 7844c8bdce
4 changed files with 21 additions and 12 deletions
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2
.cproject
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@ -36,7 +36,7 @@
</tool>
<tool id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.1285639549" name="MCU/MPU GCC Compiler" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler">
<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.debuglevel.75005491" name="Debug level" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.debuglevel" useByScannerDiscovery="false" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.debuglevel.value.g3" valueType="enumerated"/>
<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.optimization.level.1711938240" name="Optimization level" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.optimization.level" useByScannerDiscovery="false"/>
<option id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.optimization.level.1711938240" name="Optimization level" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.optimization.level" useByScannerDiscovery="false" value="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.optimization.level.value.o0" valueType="enumerated"/>
<option IS_BUILTIN_EMPTY="false" IS_VALUE_EMPTY="false" id="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.definedsymbols.1662015804" name="Define symbols (-D)" superClass="com.st.stm32cube.ide.mcu.gnu.managedbuild.tool.c.compiler.option.definedsymbols" useByScannerDiscovery="false" valueType="definedSymbols">
<listOptionValue builtIn="false" value="DEBUG"/>
<listOptionValue builtIn="false" value="USE_HAL_DRIVER"/>

12
Core/Src/DHT11.c
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@ -15,6 +15,7 @@ static void wait(uint32_t wait_us)
static size_t dht11_measure_high_duration(void)
{
SKIP_LOW;
uint32_t start_time = TIM2->CNT;
SKIP_HIGH;
uint32_t end_time = TIM2->CNT;
@ -28,7 +29,7 @@ static size_t dht11_read_value(struct DHT11_Data *data)
// treat data as a normal array to simplify read loop
uint8_t *buffer = (uint8_t *) data;
register uint8_t read_register = 0;
register uint32_t read_register = 0;
TIM2->CNT = 0;
HAL_TIM_Base_Start(&htim2);
@ -44,11 +45,11 @@ static size_t dht11_read_value(struct DHT11_Data *data)
GPIOD->MODER &= 0xFF3FFFFF; // switch GPIOD 11 to input mode
// reading transmission from DHT11
// reading pull down from DHT11
SKIP_LOW;
// waiting for 50 ms max
for (size_t i = TIM2->CNT + (50000 << 4); TIM2->CNT >= i; )
// waiting for 500ms max
for (size_t i = TIM2->CNT + (500000 << 4); TIM2->CNT <= i; )
if (!(GPIOD->IDR & 0x0800))
goto reading_data;
@ -60,11 +61,10 @@ reading_data:
for (size_t i = 0; i < 5; i++) {
for (register size_t j = 0; j < 8; j++) {
read_register <<= 1;
SKIP_LOW;
read_register |= dht11_measure_high_duration();
}
buffer[i] = read_register;
buffer[i] = (uint8_t) read_register;
}
HAL_TIM_Base_Stop(&htim2);

17
Core/Src/main.c
View File

@ -112,7 +112,7 @@ int delay_between_runs[] = {
-1
};
size_t current_executor_id = 0;
size_t current_executor_id = 11;
size_t buttons_interrupt_enabled;
@ -641,10 +641,17 @@ static void MX_GPIO_Init(void)
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);
/*Configure GPIO pins : PD11 PD12 PD13 PD14
PD15 PD4 PD7 */
GPIO_InitStruct.Pin = GPIO_PIN_11|GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14
|GPIO_PIN_15|GPIO_PIN_4|GPIO_PIN_7;
/*Configure GPIO pin : PD11 */
GPIO_InitStruct.Pin = GPIO_PIN_11;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
/*Configure GPIO pins : PD12 PD13 PD14 PD15
PD4 PD7 */
GPIO_InitStruct.Pin = GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15
|GPIO_PIN_4|GPIO_PIN_7;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;

2
test1.ioc
View File

@ -121,6 +121,8 @@ PC8.Locked=true
PC8.Signal=GPIO_Input
PC9.Locked=true
PC9.Signal=GPIO_Input
PD11.GPIOParameters=GPIO_Speed
PD11.GPIO_Speed=GPIO_SPEED_FREQ_VERY_HIGH
PD11.Locked=true
PD11.Signal=GPIO_Output
PD12.Locked=true