Question
I2C endless loop in HAL_I2C_GetState
Posted on January 18, 2017 at 16:20
Hi,
im using a STM32L476RG and want to interace an extrenal RTC via I2C.
cube = 4.19.0
lib L4 = 1.6.0
hi2c1.Instance = I2C1;
hi2c1.Init.Timing = 0x10909CEC; hi2c1.Init.OwnAddress1 = 0; hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT; hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE; hi2c1.Init.OwnAddress2 = 0; hi2c1.Init.OwnAddress2Masks = I2C_OA2_NOMASK; hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE; hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;/**I2C1 GPIO Configuration
PB6 ------> I2C1_SCL PB7 ------> I2C1_SDA */ GPIO_InitStruct.Pin = GPIO_PIN_6|GPIO_PIN_7; GPIO_InitStruct.Mode = GPIO_MODE_AF_OD; GPIO_InitStruct.Pull = GPIO_PULLUP; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH; GPIO_InitStruct.Alternate = GPIO_AF4_I2C1; HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);/* Peripheral clock enable */
__HAL_RCC_I2C1_CLK_ENABLE();/* Peripheral DMA init*/
hdma_i2c1_rx.Instance = DMA1_Channel7; hdma_i2c1_rx.Init.Request = DMA_REQUEST_3; hdma_i2c1_rx.Init.Direction = DMA_PERIPH_TO_MEMORY; hdma_i2c1_rx.Init.PeriphInc = DMA_PINC_DISABLE; hdma_i2c1_rx.Init.MemInc = DMA_MINC_ENABLE; hdma_i2c1_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE; hdma_i2c1_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE; hdma_i2c1_rx.Init.Mode = DMA_NORMAL; hdma_i2c1_rx.Init.Priority = DMA_PRIORITY_LOW; if (HAL_DMA_Init(&hdma_i2c1_rx) != HAL_OK) { Error_Handler(); }__HAL_LINKDMA(i2cHandle,hdmarx,hdma_i2c1_rx);
hdma_i2c1_tx.Instance = DMA1_Channel6;
hdma_i2c1_tx.Init.Request = DMA_REQUEST_3; hdma_i2c1_tx.Init.Direction = DMA_MEMORY_TO_PERIPH; hdma_i2c1_tx.Init.PeriphInc = DMA_PINC_DISABLE; hdma_i2c1_tx.Init.MemInc = DMA_MINC_ENABLE; hdma_i2c1_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE; hdma_i2c1_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE; hdma_i2c1_tx.Init.Mode = DMA_NORMAL; hdma_i2c1_tx.Init.Priority = DMA_PRIORITY_LOW; if (HAL_DMA_Init(&hdma_i2c1_tx) != HAL_OK) { Error_Handler(); }__HAL_LINKDMA(i2cHandle,hdmatx,hdma_i2c1_tx);
Sourcecode:
while (HAL_I2C_GetState(&hi2c1) != HAL_I2C_STATE_READY){ }
if(HAL_I2C_Master_Transmit_DMA(&hi2c1, RTC_ADDRESS, (uint8_t*)txBuffer, TX_BUFFERSIZE)!= HAL_OK) { Error_Handler(); } while (HAL_I2C_GetState(&hi2c1) != HAL_I2C_STATE_READY){ }So I'm waiting until the bus is free. But after the first transmit, the HAL_I2C_GetState never get ready!
The logic analyser detects a ACK for the RTC.
Could someone help me? I read a lot of forum sides, but do not found a concret solution for this problem.
regards
Roger
#l4