Fixed uart interrupt enable/disable

fw_old/Core/Src/main.c

@@ -659,6 +659,8 @@ int8_t uart_disable_interrupts(void)
 int8_t uart_enable_interrupts(void)
 {
 	LL_LPUART_Enable(LPUART1);
+	LL_LPUART_ClearFlag_IDLE(LPUART1);
+	LL_LPUART_ClearFlag_NE(LPUART1);
 	LL_LPUART_EnableIT_IDLE(LPUART1);
 	LL_LPUART_EnableIT_RXNE(LPUART1);
 

fw_old/Core/Src/scd4x.c

@@ -66,6 +66,8 @@ int8_t scd4x_read_measurement(uint16_t * co2, int16_t *temperature, uint16_t *re
 	}*/
 
 
+	// disable interrupts to prevent MODBUS/I2C conflict
+	uart_disable_interrupts();
 	// start measurement
 	buffer[0] = SCD4X_READ_MEASUREMENT >> 8;
 	buffer[1] = SCD4X_READ_MEASUREMENT & 0x00ff;
@@ -80,6 +82,7 @@ int8_t scd4x_read_measurement(uint16_t * co2, int16_t *temperature, uint16_t *re
 	uart_disable_interrupts();
 	// read out
 	result = i2c_receive(SCD4X_I2C_ADDRESS<<1, buffer, 9);
+	uart_enable_interrupts();
 	if (result != I2C_OK)
 	{
 		return SCD4X_ERROR;

fw_old/Core/Src/sht4x.c

@@ -23,6 +23,8 @@ int8_t sht4x_measure(int16_t *temperature, uint16_t *relative_humidity)
 	uint8_t buffer[32];
 	int result;
 
+	// disable interrupts
+	uart_disable_interrupts();
 	// start measurement
 	buffer[0] = SHT4X_START_MEAS_HIGH_PRECISION;
 	result = i2c_transmit(SHT4X_I2C_ADDRESS<<1, buffer, 1);
@@ -31,11 +33,14 @@ int8_t sht4x_measure(int16_t *temperature, uint16_t *relative_humidity)
 	if (result != I2C_OK) {
 		return SHT4X_ERROR;
 	}*/
+	// enable interrupts while waiting
 	uart_enable_interrupts();
 	LL_mDelay(10); // 10 ms should be enough
 	uart_disable_interrupts();
 	// read out
 	result = i2c_receive(SHT4X_I2C_ADDRESS<<1, buffer, 6);
+	// enable interrupts again
+	uart_enable_interrupts();
 	if (result != I2C_OK) {
 		return SHT4X_ERROR;
 	}

fw_old/Debug/Core/Src/main.su

@@ -17,6 +17,8 @@ stm32l0xx_ll_lpuart.h:1233:22:LL_LPUART_SetDEAssertionTime	16	static
 stm32l0xx_ll_lpuart.h:1255:22:LL_LPUART_EnableDEMode	16	static
 stm32l0xx_ll_lpuart.h:1291:22:LL_LPUART_SetDESignalPolarity	16	static
 stm32l0xx_ll_lpuart.h:1400:26:LL_LPUART_IsActiveFlag_TXE	16	static
+stm32l0xx_ll_lpuart.h:1533:22:LL_LPUART_ClearFlag_NE	16	static
+stm32l0xx_ll_lpuart.h:1555:22:LL_LPUART_ClearFlag_IDLE	16	static
 stm32l0xx_ll_lpuart.h:1619:22:LL_LPUART_EnableIT_IDLE	16	static
 stm32l0xx_ll_lpuart.h:1631:22:LL_LPUART_EnableIT_RXNE	16	static
 stm32l0xx_ll_lpuart.h:1726:22:LL_LPUART_DisableIT_IDLE	16	static
@@ -58,6 +60,6 @@ main.c:596:13:MX_GPIO_Init	32	static
 main.c:639:6:LPUART1_TX_Buffer	24	static,ignoring_inline_asm
 main.c:650:8:uart_disable_interrupts	8	static
 main.c:659:8:uart_enable_interrupts	8	static
-main.c:668:8:modbus_slave_callback	32	static
+main.c:670:8:modbus_slave_callback	32	static
-main.c:787:8:modbus_transmit_function	16	static
+main.c:789:8:modbus_transmit_function	16	static
-main.c:799:6:Error_Handler	8	static,ignoring_inline_asm
+main.c:801:6:Error_Handler	8	static,ignoring_inline_asm

tests/read_input_register_test.py

@@ -4,10 +4,10 @@ from sys import exit
 import minimalmodbus
 import serial
 
-slave_address = 254
+slave_address = 252
 instrument = minimalmodbus.Instrument('/dev/rs485', slave_address, close_port_after_each_call=True)  # port name, slave address (in decimal)
 
-instrument.serial.baudrate = 19200
+instrument.serial.baudrate = 115200
 instrument.serial.bytesize = 8
 instrument.serial.parity   = serial.PARITY_EVEN
 instrument.serial.stopbits = 1