Content originally posted in LPCWare by blueshif on Thu Apr 28 00:27:55 MST 2016
Hi all,
We are developing on Keil uVision v4.74 for LPC2478 controller and using Keil ULinkPro for debugging. We are facing issues with the UART FIFO Control Register.
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We are using UART1 interface without Modem capabilities. Follwing is our initialization code:
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<code>
//configure pin selections for UART1
// configure UART
// enable power to UART
PCONP |= (1 << MODBUS_OPTION2_POWER_BIT);
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// RX and TX interrupts
U1IER = 0x3;
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// DLAB = 1
U1LCR = 0x83;
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U1FCR = 0x87; //Issue:actual value set is 0xC1
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//Set Parity bit, Stop bit and baud rate according to application
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U1LCR &= 0x7F ; // DLAB = 0
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U1IER = 0x07;
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The issue we are facing with the UART1 Fifo Control Register U1FCR is not setting the value correctly. U1FCR has following structure:
Bit 0 - FIFO Enable
Bit 1 - Rx FIFO Reset
Bit 2 - Tx FIFO Reset
Bit 5:3 - Reserved
Bit 7:6 - Rx Trigger Level
00 - Trigger level 0 (1 character or 0x01)
01 - Trigger level 1 (4 characters or 0x04)
10 - Trigger level 2 (8 characters or 0x08)
11 - Trigger level 3 (14 characters or 0x0E)
Everytime we set value 0x87(Trigger Level 2, Rx-Tx Fifo Reset, FIFO Enable), it is setting as 0xC1(Trigger Level 3,FIFO Enable)
Help needed seriously.
