Mercurial > public > ostc4
view Small_CPU/Src/uart.c @ 328:4fe5400567e7 I2C_Improvment
Set I2C speed to 88kHz, use digital filter only and reworked idle clock recovery
The errata describes a possible problem in operation between 88kHz and 100kHz => Set speed as recommended as work around.
Based on reference implementation only one filter should be use. Choice was digital because only drawback is lag of wakeup functionality which is not used
I2C communication may be randomly interrupted e.g. by a RTE reset or firmware update => reworked recovery function to get I2C devices in idle state again (Clk and SDA HIGH)
author | ideenmodellierer |
---|---|
date | Wed, 17 Jul 2019 22:42:15 +0200 |
parents | 5f11787b4f42 |
children | 1b995079c045 |
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/** ****************************************************************************** * @file uart.c * @author heinrichs weikamp gmbh * @version V0.0.1 * @date 27-March-2014 * @brief button control * @verbatim ============================================================================== ##### How to use ##### ============================================================================== @endverbatim ****************************************************************************** * @attention * * <h2><center>© COPYRIGHT(c) 2015 heinrichs weikamp</center></h2> * ****************************************************************************** */ /* Includes ------------------------------------------------------------------*/ #include "uart.h" /* Private variables ---------------------------------------------------------*/ UART_HandleTypeDef huart2; /* Exported functions --------------------------------------------------------*/ void MX_USART2_UART_Init(void) { /* pullup special */ GPIO_InitTypeDef GPIO_InitStructure; __GPIOA_CLK_ENABLE(); GPIO_InitStructure.Pin = GPIO_PIN_2; GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStructure.Pull = GPIO_PULLUP; GPIO_InitStructure.Speed = GPIO_SPEED_FAST; HAL_GPIO_Init(GPIOA, &GPIO_InitStructure); /* regular init */ huart2.Instance = USART2; huart2.Init.BaudRate = 1200; 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; HAL_UART_Init(&huart2); } uint8_t UART_ButtonAdjust(uint8_t *array) { uint8_t answer[4]; HAL_UART_Transmit(&huart2,array,4,1000); HAL_UART_Receive(&huart2,answer,4,2000); if( (answer[0] == array[0]) &&(answer[1] == array[1]) &&(answer[2] == array[2]) &&(answer[3] == array[3])) return 1; else return 0; } void MX_USART2_UART_DeInit(void) { HAL_UART_DeInit(&huart2); } /************************ (C) COPYRIGHT heinrichs weikamp *****END OF FILE****/