Hello, I am working in mdk5. For my application I am writting code for RS485. While debugging I found that my FCR register is not loading its value. The code I have written is show below. void uart_rs485(void) { SCU_PinConfigure(2,3, SCU_CFG_MODE_FUNC2);// p2_3 for U3_TXD SCU_PinConfigure(2,4, SCU_CFG_MODE_FUNC2);// p2_4 for U3_RXD GPIO_SetDir(4,11,GPIO_DIR_OUTPUT);// Set GIO_B1_RS485_DIR as output
LPC_USART3->LCR = 0x83;// Line Control Register LPC_USART3->FCR =0x07;//FIFO buffer LPC_USART3->FDR =0;// Fractional Divide LPC_USART3->DLM =0;//Divide Latch MSB LPC_USART3->DLL =98;//Divide Latch LSB LPC_USART3->LCR =0x03;//Disable DLAB
} void uart_rs485_transmit(void) { GPIO_PinWrite(4,11,1);//Making Transmit Enable high if(LPC_USART3->LSR & 0x20) { LPC_USART3->THR = 83; } }
void uart_rs485_receive(void) { GPIO_PinWrite(4,11,0);//Receive Enable a = LPC_USART3->RBR; } Please help me in this flow. Thank you in advance
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Too critical for you to bother to follow the simple, clearly-stated instructions on how to post source code, then?
www.danlhenry.com/.../keil_code.png
There's one line that's not right:
LPC_USART3->LCR = 0x83;// Line Control Register LPC_USART3->FCR =0x07;//FIFO buffer
You seem to have code that's commented out.
It looks like that's not the only line like it.
If you want code to be compiled, you have to make sure it's not commented out.
PLEASE SORT OUT THIS PROBLEM AND GET BACK TO US. IT IS IMPERATIVE THAT YOU GET IT TO US AS SOON AS POSSIBLE. IT IS CRITICAL.
sorry Carrut. The code id given here. I think you can get it now.
void uart_rs485(void) { SCU_PinConfigure(2,3, SCU_CFG_MODE_FUNC2); SCU_PinConfigure(2,4, SCU_CFG_MODE_FUNC2); GPIO_SetDir(4,11,GPIO_DIR_OUTPUT); LPC_USART3->LCR = 0x83; LPC_USART3->FCR =0x07; LPC_USART3->FDR =0; LPC_USART3->DLM =0; LPC_USART3->DLL =98; LPC_USART3->LCR =0x03;
void uart_rs485_receive(void) { GPIO_PinWrite(4,11,0);//Receive Enable a = LPC_USART3->RBR; }