经过多次测试，发现用
STM32CubeMX生成的串口
通信程序，串口波特率设置不能超过2M，如果大于2M在 HAL_StatusTypeDef UART_SetConfig(UART_HandleTypeDef *huart) 这个函数会报错！！
我的波特率设置是这样的
huart1.Instance = USART1;
huart1.Init.BaudRate = 2500000；//115200;
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_8;
huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
huart1.Init.ClockPrescaler = UART_PRESCALER_DIV1;//UART_PRESCALER_DIV1;
huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
这个是在波特率配置后 usartdiv 不满足条件进入 ret = HAL_ERROR;
/* USARTDIV must be greater than or equal to 0d16 */
if ((usartdiv >= UART_BRR_MIN) (usartdiv <= UART_BRR_MAX))
{
brrtemp = (uint16_t)(usartdiv 0xFFF0U);
brrtemp |= (uint16_t)((usartdiv (uint16_t)0x000FU) >> 1U);
huart->Instance->BRR = brrtemp;
}
else
{
ret = HAL_ERROR;
}
下面是我的时钟配置
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
/** Supply configura
tion update enable
*/
HAL_PWREx_ConfigSupply(PWR_LDO_SUPPLY);
/** Configure the main internal regulator output voltage
*/
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE0);
while(!__HAL_PWR_GET_FLAG(PWR_FLAG_VOSRDY)) {}
/** Initializes the CPU, AHB and APB busses clocks
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI|RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.HSIState = RCC_HSI_DIV1;
RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLM = 2;
RCC_OscInitStruct.PLL.PLLN = 240;
RCC_OscInitStruct.PLL.PLLP = 2;
RCC_OscInitStruct.PLL.PLLQ = 2;
RCC_OscInitStruct.PLL.PLLR = 2;
RCC_OscInitStruct.PLL.PLLRGE = RCC_PLL1VCIRANGE_2;
RCC_OscInitStruct.PLL.PLLVCOSEL = RCC_PLL1VCOWIDE;
RCC_OscInitStruct.PLL.PLLFRACN = 0;
if (HAL_RCC_OscConfig( RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB busses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2
|RCC_CLOCKTYPE_D3PCLK1|RCC_CLOCKTYPE_D1PCLK1;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.SYSCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.AHBCLKDivider = RCC_HCLK_DIV2;
RCC_ClkInitStruct.APB3CLKDivider = RCC_APB3_DIV2;
RCC_ClkInitStruct.APB1CLKDivider = RCC_APB1_DIV2;
RCC_ClkInitStruct.APB2CLKDivider = RCC_APB2_DIV2;
RCC_ClkInitStruct.APB4CLKDivider = RCC_APB4_DIV2;
if (HAL_RCC_ClockConfig( RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK)
{
Error_Handler();
}
PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_USART3|RCC_PERIPHCLK_USART2
|RCC_PERIPHCLK_UART4|RCC_PERIPHCLK_UART7
|RCC_PERIPHCLK_FDCAN|RCC_PERIPHCLK_USART1
|RCC_PERIPHCLK_UART8|RCC_PERIPHCLK_UART5
|RCC_PERIPHCLK_SPI4|RCC_PERIPHCLK_ADC
|RCC_PERIPHCLK_I2C4|RCC_PERIPHCLK_LPTIM1
|RCC_PERIPHCLK_CKPER;
PeriphClkInitStruct.CkperClockSelection = RCC_CLKPSOURCE_HSI;
PeriphClkInitStruct.Spi45ClockSelection = RCC_SPI45CLKSOURCE_D2PCLK1;
PeriphClkInitStruct.FdcanClockSelection = RCC_FDCANCLKSOURCE_HSE;
PeriphClkInitStruct.Usart234578ClockSelection = RCC_USART234578CLKSOURCE_D2PCLK1;
PeriphClkInitStruct.Usart16ClockSelection = RCC_USART16CLKSOURCE_D2PCLK2;
PeriphClkInitStruct.Lptim1ClockSelection = RCC_LPTIM1CLKSOURCE_D2PCLK1;
PeriphClkInitStruct.I2c4ClockSelection = RCC_I2C4CLKSOURCE_D3PCLK1;
PeriphClkInitStruct.AdcClockSelection = RCC_ADCCLKSOURCE_CLKP;
if (HAL_RCCEx_PeriphCLKConfig( PeriphClkInitStruct) != HAL_OK)
{
Error_Handler();
}
}
串口的时钟 有120M ，理论上配置大于2M波特率应该没有问题，为什么实际上我配置后，在HAL_StatusTypeDef UART_SetConfig(UART_HandleTypeDef *huart) 这个函数会报错，？有没有高手解释一下！！
举报
