Question
stm8l151g4 DMA USART recieve only once
Hi.
i'm try using USART1 and recieve bytes with DMA from SBUS transmitter.
. But have strange problem - i'm recive only once and later DMA IRQ TC2 never occure. I'm try many variants - all not help me(((
Here my some code -
#define USART_DMA_CHANNEL_RX DMA1_Channel2
#define USART_DMA_CHANNEL_TX DMA1_Channel1
#define USART_DMA_FLAG_TCRX (uint16_t)DMA1_FLAG_TC2
#define USART_DMA_FLAG_TCTX (uint16_t)DMA1_FLAG_TC1
#define USART_DR_ADDRESS (uint16_t)0x5231 /* USART1 Data register Address */
#define USART_TX_BUF_ADDR (uint32_t)(&dma_pack)
uint8_t dma_pack[40];
static void USART_Config( void )
{
CLK_PeripheralClockConfig( CLK_Peripheral_USART1, ENABLE );
SYSCFG_REMAPPinConfig( REMAP_Pin_USART1TxRxPortA, ENABLE );
GPIO_ExternalPullUpConfig( GPIOA, GPIO_Pin_3, ENABLE );
GPIO_ExternalPullUpConfig( GPIOA, GPIO_Pin_2, ENABLE );
USART_Init( USART1, ( uint32_t )100000, USART_WordLength_9b, USART_StopBits_2,
USART_Parity_Even, ( USART_Mode_TypeDef )( USART_Mode_Rx ) );
USART_Cmd( USART1, ENABLE);
}
static void DMA_Config( void )
{
DMA_GlobalDeInit();
DMA_DeInit( USART_DMA_CHANNEL_TX );
DMA_DeInit( USART_DMA_CHANNEL_RX );
CLK_PeripheralClockConfig( CLK_Peripheral_DMA1, ENABLE );
DMA_Init( USART_DMA_CHANNEL_RX, USART_TX_BUF_ADDR, USART_DR_ADDRESS,
SBUS_PACKET_SIZE, DMA_DIR_PeripheralToMemory, DMA_Mode_Normal,
DMA_MemoryIncMode_Inc, DMA_Priority_Low, DMA_MemoryDataSize_Byte );
DMA_ITConfig( USART_DMA_CHANNEL_RX, DMA_ITx_TC, ENABLE );
DMA_Cmd( USART_DMA_CHANNEL_RX, ENABLE );
USART_DMACmd( USART1, USART_DMAReq_RX, ENABLE );
DMA_GlobalCmd( ENABLE );
}
INTERRUPT_HANDLER( DMA1_CHANNEL2_3_IRQHandler, 3 )
{
if ( DMA_GetFlagStatus( DMA1_FLAG_TC2 ) != RESET )
DMA_Cmd( DMA1_Channel2, DISABLE );
DMA_SetCurrDataCounter( DMA1_Channel2, 25 );
DMA_Cmd( DMA1_Channel2, ENABLE );
DMA_ClearFlag( DMA1_FLAG_TC2 );
}
}
main()
{
CLK_SYSCLKDivConfig( CLK_SYSCLKDiv_1 );
USART_Config();
DMA_Config();
while(1);
}But IRQ dma2 fired only once and not later and program always stay in while loop.
There no problem in UART sender - uart-usb reciever working good and always getting SBUS packets..
Where maybe problem?