I have tried with an image that sherazi have in one of his blogs without. I am actually looking for SIM900B email firmware, the last firmware I am using is 1137B09SIM900B32ST. If(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) /* RXNE if set, then data is received in DR register. Hello chipseller, All the info here have been very useful to understand more about SIM900 firmwares and tools. Especially the Alternate Function assignment. ![]() I was using STM32F0 Discovery board, so the pins and functions are different. Here i am using CooCox with inbuilt libraries for fast code implementation We will use SIM800/900 GSM Module with STM32 Microcontroller, i.e STM32F103C8T6 and send the DHT11 Sensor data to Thingspeak Server. NVIC_EnableIRQ(USART1_IRQn) //NVIC enables the IRQ 1 4 minutes read In this project we will learn about IoT using GSM Module. USART_ITConfig(USART1, USART_IT_RXNE, ENABLE) // ONLY RX mode config UART1_BT.USART_HardwareFlowControl = USART_HardwareFlowControl_None UART1_BT.USART_StopBits = USART_StopBits_1 UART1_BT.USART_WordLength = USART_WordLength_8b GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_0) The SIM900 can communicate with an external. GPIO_RX_Pin.GPIO_PuPd = GPIO_PuPd_NOPULL In this tutorial, well learn how to send a text message using an STM32 microcontroller and SIM900 GSM module. Quad Band GSM GPRS SIM900 Shield Development Board. GPIO_RX_Pin.GPIO_Speed = GPIO_Speed_Level_1 STM32 by ST NUCLEO-F756 STM32 Nucleo-144 Development Board with STM32F756 MCU. ![]() * Configure USART1 pins: Rx * - PB7 Alternative as TIM1 uses 4 channel PWM generation */ RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE) RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE) Make sure your grounds are common, or else it won't work. This is the code which i used for USART Receive only mode at 9600 Baud Rate. ![]() If((Timeout = 0)||((HAL_GetTick() - tickstart ) > Timeout)) While(_HAL_UART_GET_FLAG(huart, Flag) = RESET) To be exact, it goes inside this first if and waits for the next character to be received: /* Wait until flag is set */ When I step into the HAL_UART_Receive function in debug mode, I see the program stuck inside static HAL_StatusTypeDef UART_WaitOnFlagUntilTimeout() function. If( HAL_UART_Receive(
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