当前,我正在通过DMA实现I2C传输,以获取固定数量的字节。
STM32 MCU:STM32L152RDT6
STM32是slave
,而Arduino是master
。
我已经在Arduino中实现了,它将每次发送3个字节的I2C命令。
但是,回调函数HAL_I2C_SlaveRxCpltCallback
仅执行一次。
我将RX和TX的DMA请求模式设置为circular
,以连续接收相同数量的字节。
在main.c
中用于初始化I2C:
static void MX_I2C1_Init(void)
{
hi2c1.Instance = I2C1;
hi2c1.Init.ClockSpeed = 400000;
hi2c1.Init.DutyCycle = I2C_DUTYCYCLE_2;
hi2c1.Init.OwnAddress1 = I2C_ADDRESS*2; //I2C_ADDRESS = 0x30
hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
hi2c1.Init.OwnAddress2 = 0;
hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
if (HAL_I2C_Init(&hi2c1) != HAL_OK)
{
Error_Handler();
}
HAL_I2C_Slave_Receive_DMA( &hi2c1, ucRxbuffer_obc, 3); //Try to get 3 bytes from master
}
关于HAL_I2C_MspInit
中的stm32lxx_hal_msp.c
函数:
我检查了其他示例,这些示例说__HAL_RCC_I2C1_CLK_ENABLE()
的顺序需要移到GPIO_Init
之前。
void HAL_I2C_MspInit(I2C_HandleTypeDef* hi2c)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
if(hi2c->Instance==I2C1)
{
__HAL_RCC_GPIOB_CLK_ENABLE();
/* Peripheral clock enable */
__HAL_RCC_I2C1_CLK_ENABLE();
/* I2C1 DMA Init */
/* I2C1_RX Init */
hdma_i2c1_rx.Instance = DMA1_Channel7;
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_CIRCULAR;
hdma_i2c1_rx.Init.Priority = DMA_PRIORITY_LOW;
if (HAL_DMA_Init(&hdma_i2c1_rx) != HAL_OK)
{
Error_Handler();
}
__HAL_LINKDMA(hi2c,hdmarx,hdma_i2c1_rx);
/* I2C1_TX Init */
hdma_i2c1_tx.Instance = DMA1_Channel6;
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_CIRCULAR;
hdma_i2c1_tx.Init.Priority = DMA_PRIORITY_LOW;
if (HAL_DMA_Init(&hdma_i2c1_tx) != HAL_OK)
{
Error_Handler();
}
__HAL_LINKDMA(hi2c,hdmatx,hdma_i2c1_tx);
/* I2C1 interrupt Init */
HAL_NVIC_SetPriority(I2C1_EV_IRQn, 5, 0);
HAL_NVIC_EnableIRQ(I2C1_EV_IRQn);
HAL_NVIC_SetPriority(I2C1_ER_IRQn, 5, 0);
HAL_NVIC_EnableIRQ(I2C1_ER_IRQn);
/**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);
}
最后,回调函数:
void HAL_I2C_SlaveRxCpltCallback(I2C_HandleTypeDef *hi2c)
{
sprintf(cMessage, "message[0]: %u\n\r", ucRxbuffer_obc[0]);
debugprintf(cMessage); // It is function like printf and have been tested.
}
但是,回叫功能只能在第一次触发。
我想设置什么吗?
答案 0 :(得分:0)
我知道回调会“禁用”中断,因此您必须在内部重新启用它