I'm using an STM32G071G8U6TR and a CP2102N-Axx-xQFN28 to communicate over USB. I am managing to get messages onto the STM32 but it seems that the first few characters of the message are coming through jumbled,
#include "main.h"
#include "UART_Polling.h"
#include "stdbool.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
UART_HandleTypeDef huart2;
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART2_UART_Init(void);
/* USER CODE BEGIN PFP */
static uint16_t Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength);
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
uint32_t cycle;
/*********************** 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 *************/
uint8_t tx_buff[] = {65, 66, 67, 68, 69, 70, 71, 72, 73, 74}; //Transmitter Buffer
uint8_t true_buff[] = {77, 101, 115, 115, 97, 103, 101, 32, 114, 101, 99, 101, 105, 118, 101, 100, 10, 13}; //True buffer - 18 Characters long
uint8_t false_buff[] = {78, 111, 32, 109, 101, 115, 115, 97, 103, 101, 10, 13}; //False buffer - 12 Characters long
uint8_t v_set_buff[] = {86, 97, 108, 117, 101, 32, 115, 101, 116, 32, 65, 51, 51, 46, 52, 10, 13}; //Value Set buffer - 17 characters long
uint8_t i_set_buff[] = {73, 110, 99, 114, 101, 109, 101, 110, 116, 32, 115, 101, 116, 32, 51, 51, 46, 52, 10, 13}; //Increment Set buffer - 20 Character long
uint8_t idn_buff[] = {"FLANN MICROWAVE"};
uint8_t status_ref[] = {48, 48, 48, 48, 48, 48, 48, 48, 10, 13}; //Status bit - 10 characters long
uint8_t comm_error[] = {"UNKNOWN COMMAND"};
uint8_t rx_buff[30] = {"##############################"};
uint8_t process_buff[30] = {"##############################"};
uint8_t i=0;
uint8_t temp = 0;
bool uart_received = false;
bool query;
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_USART2_UART_Init();
/* USER CODE BEGIN 2 */
HAL_GPIO_WritePin(debug_LED_GPIO_Port, debug_LED_Pin, GPIO_PIN_SET);
HAL_UART_Receive_IT(&huart2, rx_buff, 10);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
//PollingInit();
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
if (rx_buff[0] != 0x23)
{
while(i<30)
{
if (rx_buff[i] == 0x3F) // If ?
{
tx_buff[0] = 0x74; //t
tx_buff[1] = 0x65; //e
tx_buff[2] = 0x73; //s
tx_buff[3] = 0x74; //t
tx_buff[4] = 0x20; //' '
tx_buff[5] = 0x72; //r
tx_buff[6] = 0x65; //e
tx_buff[7] = 0x63; //c
tx_buff[8] = 0x65; //e
tx_buff[9] = 0x69; //i
tx_buff[10] = 0x76; //v
tx_buff[11] = 0x65; //e
tx_buff[12] = 0x64; //d
tx_buff[13] = 0x0A;
tx_buff[14] = 0x0D;
HAL_UART_Transmit_IT(&huart2, tx_buff, 15);
}
if (rx_buff[i] > 96)
{
process_buff[i] = rx_buff[i] - 32;
rx_buff[i] = 0x23;
}
else
{
process_buff[i] = rx_buff[i];
rx_buff[i] = 0x23;
}
if (process_buff[i] == 0x3F)
{
query = true;
HAL_GPIO_TogglePin(debug_LED_GPIO_Port, debug_LED_Pin);
}
HAL_Delay(100);
i++;
}
process_buff[28] = 0x0A;
process_buff[29] = 0x0D;
HAL_UART_Transmit_IT(&huart2, process_buff, 30);
tx_buff[i] = 10;
i++;
tx_buff[i] = 13;
//HAL_UART_Transmit_IT(&huart2, tx_buff, 15);
HAL_Delay(1000);
i = 0;
while (i < 30)
{
rx_buff[i] = 0x23;
i++;
}
}
}
/* USER CODE END 3 */
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Configure the main internal regulator output voltage
*/
HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1);
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSIDiv = RCC_HSI_DIV1;
RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
{
Error_Handler();
}
}
/**
* @brief USART2 Initialization Function
* None
* @retval None
*/
static void MX_USART2_UART_Init(void)
{
/* USER CODE BEGIN USART2_Init 0 */
/* USER CODE END USART2_Init 0 */
/* USER CODE BEGIN USART2_Init 1 */
/* USER CODE END USART2_Init 1 */
huart2.Instance = USART2;
huart2.Init.BaudRate = 115200;
huart2.Init.WordLength = UART_WORDLENGTH_8B;
huart2.Init.StopBits = UART_STOPBITS_1;
huart2.Init.Parity = UART_PARITY_NONE;
huart2.Init.Mode = UART_MODE_TX_RX;
huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart2.Init.OverSampling = UART_OVERSAMPLING_16;
huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
huart2.Init.ClockPrescaler = UART_PRESCALER_DIV1;
huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
if (HAL_UART_Init(&huart2) != HAL_OK)
{
Error_Handler();
}
if (HAL_UARTEx_SetTxFifoThreshold(&huart2, UART_TXFIFO_THRESHOLD_1_8) != HAL_OK)
{
Error_Handler();
}
if (HAL_UARTEx_SetRxFifoThreshold(&huart2, UART_RXFIFO_THRESHOLD_1_8) != HAL_OK)
{
Error_Handler();
}
if (HAL_UARTEx_DisableFifoMode(&huart2) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN USART2_Init 2 */
/* USER CODE END USART2_Init 2 */
}
/**
* @brief GPIO Initialization Function
* None
* @retval None
*/
static void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
/* USER CODE BEGIN MX_GPIO_Init_1 */
/* USER CODE END MX_GPIO_Init_1 */
/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOB_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(debug_LED_GPIO_Port, debug_LED_Pin, GPIO_PIN_RESET);
/*Configure GPIO pin : debug_LED_Pin */
GPIO_InitStruct.Pin = debug_LED_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(debug_LED_GPIO_Port, &GPIO_InitStruct);
/* USER CODE BEGIN MX_GPIO_Init_2 */
/* USER CODE END MX_GPIO_Init_2 */
}
/* USER CODE BEGIN 4 */
/**
* @brief Compares two buffers.
* pBuffer1, pBuffer2: buffers to be compared.
* BufferLength: buffer's length
* @retval 0 : pBuffer1 identical to pBuffer2
* >0 : pBuffer1 differs from pBuffer2
*/
static uint16_t Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength)
{
while (BufferLength--)
{
if ((*pBuffer1) != *pBuffer2)
{
return BufferLength;
}
pBuffer1++;
pBuffer2++;
}
return 0;
}
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
uart_received = true; /*Set Message Received varible*/
HAL_UART_Receive_IT(&huart2, rx_buff, 30); /*Load the message into the rx buffer*/
}
/* USER CODE END 4 */
/**
* @brief This function is executed in case of error occurrence.
* @retval None
*/
void Error_Handler(void)
{
/* USER CODE BEGIN Error_Handler_Debug */
/* User can add his own implementation to report the HAL error return state */
__disable_irq();
while (1)
{
}
/* USER CODE END Error_Handler_Debug */
}
This is the code I am currently using. At the moment once it receives a message it's meant to scan through and check for a '?', if it does see this it responds with 'test received' and then loads the received buffer into another buffer before sending that back. When I use PuTTY to send messages I get these responses.
The message sent is CL_VALUE_SET? I get a good response for the first message, the second time I send a message I don't get any response and the third time it doesn't see the ? it seems.
