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uart config without HAL

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This commit is contained in:
Eggert Jung
2025-04-25 23:02:37 +02:00
parent 51f3791ddf
commit 379255caf7
8 changed files with 54 additions and 251 deletions
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117
Src/main.c
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@@ -23,7 +23,7 @@
/* USER CODE BEGIN Includes */
#include "SEGGER_RTT.h"
#include "stm32g0b1xx.h"
#include "uart.h"
#include "stm32g0xx_hal_cortex.h"
#include <stdint.h>
#include <stdio.h>
/* USER CODE END Includes */
@@ -44,8 +44,6 @@
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
UART_HandleTypeDef huart1;
DMA_HandleTypeDef hdma_usart1_rx;
/* USER CODE BEGIN PV */
@@ -54,16 +52,33 @@ DMA_HandleTypeDef hdma_usart1_rx;
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_DMA_Init(void);
static void MX_USART1_UART_Init(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
#define BUFFER_SIZE 64
#define BUFFER_SIZE 8
uint8_t rxBuffer[BUFFER_SIZE];
void init_UART1(){
USART1->CR1 &= ~USART_CR1_UE;
RCC->APBENR2 |= RCC_APBENR2_USART1EN;
RCC->IOPENR |= RCC_IOPENR_GPIOCEN;
GPIOC->MODER &= ~GPIO_MODER_MODE5; // Alternate function mode on RX pin
GPIOC->MODER |= GPIO_MODER_MODE5_1;
GPIOC->AFR[0] &= GPIO_AFRL_AFSEL5;
GPIOC->AFR[0] |= 1 << GPIO_AFRL_AFSEL5_Pos;
USART1->BRR = 128; // 32000000÷250000
USART1->CR3 |= USART_CR3_EIE;
USART1->CR1 = USART_CR1_RE;
USART1->CR1 |= USART_CR1_UE;
HAL_NVIC_SetPriority(USART1_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(USART1_IRQn);
}
/* USER CODE END 0 */
/**
@@ -95,17 +110,31 @@ int main(void)
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_DMA_Init();
MX_USART1_UART_Init();
/* USER CODE BEGIN 2 */
HAL_UART_Receive_DMA(&huart1, rxBuffer, BUFFER_SIZE);
init_UART1();
printf("CR1 init: 0x%02lX\n", USART1->CR1 );
printf("CR2 init: 0x%02lX\n", USART1->CR2 );
printf("CR3 init: 0x%02lX\n", USART1->CR3 );
printf("BRR init: 0x%02lX\n", USART1->BRR );
printf("GTPR init: 0x%02lX\n", USART1->GTPR );
printf("RTOR init: 0x%02lX\n", USART1->RTOR );
printf("RQR init: 0x%02lX\n", USART1->RQR );
printf("ISR init: 0x%02lX\n", USART1->ISR );
printf("ICR init: 0x%02lX\n", USART1->ICR );
printf("RDR init: 0x%02lX\n", USART1->RDR );
printf("TDR init: 0x%02lX\n", USART1->TDR );
printf("PRESC init: 0x%02lX\n", USART1->PRESC);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
//HAL_UART_Receive_DMA(&huart1, rxBuffer, BUFFER_SIZE);
while (1)
{
printf("buf: %s\n", rxBuffer);
if(USART1->ISR & USART_ISR_RXNE_RXFNE)
printf("char: '%c'\n", USART1->RDR);
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
@@ -158,73 +187,6 @@ void SystemClock_Config(void)
}
/**
* @brief USART1 Initialization Function
* @param None
* @retval None
*/
static void MX_USART1_UART_Init(void)
{
/* USER CODE BEGIN USART1_Init 0 */
/* USER CODE END USART1_Init 0 */
/* USER CODE BEGIN USART1_Init 1 */
/* USER CODE END USART1_Init 1 */
huart1.Instance = USART1;
huart1.Init.BaudRate = 250000;
huart1.Init.WordLength = UART_WORDLENGTH_8B;
huart1.Init.StopBits = UART_STOPBITS_1;
huart1.Init.Parity = UART_PARITY_NONE;
huart1.Init.Mode = UART_MODE_TX_RX;
huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart1.Init.OverSampling = UART_OVERSAMPLING_16;
huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
huart1.Init.ClockPrescaler = UART_PRESCALER_DIV1;
huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
if (HAL_UART_Init(&huart1) != HAL_OK)
{
Error_Handler();
}
if (HAL_UARTEx_SetTxFifoThreshold(&huart1, UART_TXFIFO_THRESHOLD_1_8) != HAL_OK)
{
Error_Handler();
}
if (HAL_UARTEx_SetRxFifoThreshold(&huart1, UART_RXFIFO_THRESHOLD_1_8) != HAL_OK)
{
Error_Handler();
}
if (HAL_UARTEx_DisableFifoMode(&huart1) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN USART1_Init 2 */
/* USER CODE END USART1_Init 2 */
}
/**
* Enable DMA controller clock
*/
static void MX_DMA_Init(void)
{
/* DMA controller clock enable */
__HAL_RCC_DMA1_CLK_ENABLE();
/* DMA interrupt init */
/* DMA1_Channel1_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMA1_Channel1_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA1_Channel1_IRQn);
/* DMA1_Ch4_7_DMA2_Ch1_5_DMAMUX1_OVR_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMA1_Ch4_7_DMA2_Ch1_5_DMAMUX1_OVR_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA1_Ch4_7_DMA2_Ch1_5_DMAMUX1_OVR_IRQn);
}
/**
* @brief GPIO Initialization Function
* @param None
* @retval None
@@ -236,7 +198,6 @@ static void MX_GPIO_Init(void)
/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOF_CLK_ENABLE();
__HAL_RCC_GPIOC_CLK_ENABLE();
/* USER CODE BEGIN MX_GPIO_Init_2 */
/* USER CODE END MX_GPIO_Init_2 */