Posted on May 17, 2011 at 13:01Hi, everyone!
I am working with SPI communication between 2 stm32s .
( A - STM32F103RB as master , B - STM32F103RD as slave ).
The A send a command to the B , the B process the command then send response to the A.
The maximum command processing time is 5 second.
The A send a ''capture command'' and can send ''cancel command'' for it.
There is my code.
///////////////////////////////////////////////////
//. Master
.....................
u8 Capture_Command[24] = ''0x55,0xAA,..........'';
u8 Response[24];
//. send capture command
for(i = 0; i < 24; i++){
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
SPI_I2S_SendData(SPI1, Capture_Command[i]);
}
//. receive response
while (1){
while (SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_TXE) == RESET);
SPI_I2S_SendData(SPI1, 0xFF);
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
w_nData = SPI_I2S_ReceiveData(SPI1);
if( w_nData != 0x00){
Response[i] = w_nData;
for( i = 1; i< 24; i++){
while (SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_TXE) == RESET);
SPI_I2S_SendData(SPI1, 0xFF);
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
w_nData = SPI_I2S_ReceiveData(SPI1);
Response[i] = w_nData;
}
break;
}
}
///////////////////////////////////////////////////
//. Slave
int main (void)
{
................................
while(1) {
//. Process Command
if(g_blReadCommand == TRUE){
// CommandProcess();
SendResponse();
g_blReadCommand = FALSE;
}
}
void SPI2_IRQHandler(void)
{
u8 w_nData = 0;
u16 w_nLen = 0;
if (SPI_I2S_GetITStatus(SPI2, SPI_I2S_IT_RXNE) == RESET) {
return;
}
w_nData = SPI_I2S_ReceiveData(SPI2);
if( g_nPacketLen == 0 ){
if(w_nData == 0x55 ){
PACKET_DATA[0] = w_nData;
g_nPacketLen = 1;
}
else{
}
return;
}
if( g_nPacketLen == 1 ){
if(w_nData == 0xAA ){
PACKET_DATA[1] = w_nData;
g_nPacketLen = 2;
}
else{
g_nPacketLen = 0;
}
return;
}
PACKET_DATA[g_nPacketLen++] = w_nData;
if( PACKET_DATA[0] == 0x55 && PACKET_DATA[1] == 0xAA){
if( g_nPacketLen == 24){
g_blReadCommand = TRUE;
g_nPacketLen = 0;
}
}
else{
g_nPacketLen = 0;
}
}
void SendResponse()
{
u8 Test_Res[25] = {0xAA, 0x55 , 0x50 , 0x01 , 0x04 , 0x00 , 0x00 , 0x00 , 0x03 , 0x05 , 0x00 , 0x00 , 0x00 , 0x00 , 0x00 , 0x00, 0x00 , 0x00 , 0x00 , 0x00 , 0x00 , 0x00 , 0x5C , 0x01 };
u16 i;
for( i = 0; i < 24; i++){
while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET);
SPI_I2S_SendData(SPI2, Test_Res[i]);
}
}
/////////////////////////////////////////////////////////
I used fullduplex mode.
When the master(A) send command data ,the slave receive it correctly.
But when slave send response, master not receive it.
What is wrong?
Please help me.
Thank for you help and advice.
[ This message was edited by: jki79ros81 on 04-02-2009 15:05 ]
[ This message was edited by: jki79ros81 on 04-02-2009 15:07 ]
