Matthias
373a8c32b2
git-svn-id: file:///srv/dev-disk-by-uuid-17e88007-4d0c-45e0-8757-cacfcc458630/repositories/svn/Diplomarbeit@55 9fe90eed-be63-e94b-8204-d34ff4c2ff93
333 lines
9.2 KiB
C
333 lines
9.2 KiB
C
/******************************************************************************
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*
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* $RCSfile: $
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* $Revision: $
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*
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* This module provides interface routines to the LPC ARM UARTs.
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* Copyright 2004, R O SoftWare
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* No guarantees, warrantees, or promises, implied or otherwise.
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* May be used for hobby or commercial purposes provided copyright
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* notice remains intact.
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*
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* Modified by Martin Thomas for LPC23xx 24xx
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*****************************************************************************/
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#include "app_types.h"
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#include "LPC_REGS.h"
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#include "sys_config.h"
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#include "uart3.h"
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#ifndef USHRT_MAX
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#define USHRT_MAX 16
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#endif
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#include "armVIC.h"
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#include "uart3ISR.h"
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#define U3_TX_PINSEL_REG PINSEL0
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#define U3_TX_PINSEL (2UL<<0) /* PINSEL4 Value for UART3 TX */
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#define U3_TX_PINMASK (3UL<<0) /* PINSEL4 Mask for UART3 RX */
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#define U3_RX_PINSEL_REG PINSEL0
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#define U3_RX_PINSEL (2UL<<2) /* PINSEL4 Value for UART3 TX */
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#define U3_RX_PINMASK (3UL<<2) /* PINSEL4 Mask for UART3 RX */
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uint8_t uart3_rx_buffer[UART3_RX_BUFFER_SIZE];
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uint16_t uart3_rx_insert_idx, uart3_rx_extract_idx;
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uint8_t uart3_tx_buffer[UART3_TX_BUFFER_SIZE];
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uint16_t uart3_tx_insert_idx, uart3_tx_extract_idx;
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int uart3_tx_running;
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t_uart3_txcomplete uart3_tx_complete_callback;
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void uart3TxFinished(void);
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void uart3Init(uint16_t baud, uint8_t mode, uint8_t fmode)
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{
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PCONP |= BIT( 25 ); // power on UART3
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// set port pins for UART3
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// mthomas PINSEL0 = (PINSEL0 & ~U0_PINMASK) | U0_PINSEL;
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// set port pins for UART3
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// PINSEL0 = (PINSEL0 & ~U0_PINMASK) | U0_PINSEL;
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U3_TX_PINSEL_REG = ( U3_TX_PINSEL_REG & ~U3_TX_PINMASK ) | U3_TX_PINSEL;
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U3_RX_PINSEL_REG = ( U3_RX_PINSEL_REG & ~U3_RX_PINMASK ) | U3_RX_PINSEL;
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U3IER = 0x00; // disable all interrupts
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U3IIR; // clear interrupt ID
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U3RBR; // clear receive register
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U3LSR; // clear line status register
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// Set CLOCK for UART3 device (4x)
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//PCLKSEL1 = 0x00040000;
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// Set CLOCK for UART3 device (4x)
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PCLKSEL1 &= 0xFFF7FFFF;
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PCLKSEL1 |= 0x00080000;
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// Preset callback function
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uart3_tx_complete_callback = 0;
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// set the baudrate
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U3LCR = ULCR_DLAB_ENABLE; // select divisor latches
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U3DLL = (uint8_t)baud; // set for baud low byte
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U3DLM = (uint8_t)(baud >> 8); // set for baud high byte
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// set the number of characters and other
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// user specified operating parameters
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U3LCR = (mode & ~ULCR_DLAB_ENABLE);
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U3FCR = fmode;
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// initialize the interrupt vector
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VICIntSelect &= ~VIC_CHAN_TO_MASK(VIC_CHAN_NUM_UART3);
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VICIntEnClr = VIC_CHAN_TO_MASK(VIC_CHAN_NUM_UART3);
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VICVectAddr29 = (uint32_t)uart3ISR;
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VICVectPriority29 = 0xF;
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VICIntEnable = VIC_CHAN_TO_MASK(VIC_CHAN_NUM_UART3);
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// initialize the transmit data queue
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uart3_tx_extract_idx = uart3_tx_insert_idx = 0;
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uart3_tx_running = 0;
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// initialize the receive data queue
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uart3_rx_extract_idx = uart3_rx_insert_idx = 0;
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// enable receiver interrupts
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U3IER = UIER_RBR;
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}
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/******************************************************************************
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*
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* Function Name: uart3Putch()
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*
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* Description:
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* This function puts a character into the UART output queue for
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* transmission.
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*
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* Calling Sequence:
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* character to be transmitted
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*
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* Returns:
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* ch on success, -1 on error (queue full)
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*
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*****************************************************************************/
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int uart3Putch(int ch)
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{
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uint16_t temp;
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unsigned cpsr;
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temp = (uart3_tx_insert_idx + 1) % UART3_TX_BUFFER_SIZE;
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if (temp == uart3_tx_extract_idx)
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return -1; // no room
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cpsr = disableIRQ(); // disable global interrupts
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U3IER &= ~UIER_THRE; // disable TX interrupts
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restoreIRQ(cpsr); // restore global interrupts
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// check if in process of sending data
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if (uart3_tx_running)
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{
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// add to queue
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uart3_tx_buffer[uart3_tx_insert_idx] = (uint8_t)ch;
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uart3_tx_insert_idx = temp;
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}
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else
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{
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// set running flag and write to output register
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uart3_tx_running = 1;
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U3THR = (uint8_t)ch;
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}
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cpsr = disableIRQ(); // disable global interrupts
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U3IER |= UIER_THRE; // enable TX interrupts
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restoreIRQ(cpsr); // restore global interrupts
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return (uint8_t)ch;
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}
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/******************************************************************************
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*
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* Function Name: uart3Space()
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*
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* Description:
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* This function gets the available space in the transmit queue
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*
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* Calling Sequence:
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* void
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*
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* Returns:
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* available space in the transmit queue
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*
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*****************************************************************************/
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uint16_t uart3Space(void)
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{
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int space;
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if ((space = (uart3_tx_extract_idx - uart3_tx_insert_idx)) <= 0)
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space += UART3_TX_BUFFER_SIZE;
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return (uint16_t)(space - 1);
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}
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/******************************************************************************
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*
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* Function Name: uart3Puts()
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*
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* Description:
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* This function writes a NULL terminated 'string' to the UART output
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* queue, returning a pointer to the next character to be written.
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*
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* Calling Sequence:
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* address of the string
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*
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* Returns:
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* a pointer to the next character to be written
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* (\0 if full string is written)
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*
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*****************************************************************************/
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const char *uart3Puts(const char *string)
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{
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register char ch;
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while ((ch = *string) && (uart3Putch(ch) >= 0))
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string++;
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return string;
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}
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/******************************************************************************
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*
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* Function Name: uart3Write()
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*
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* Description:
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* This function writes 'count' characters from 'buffer' to the UART
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* output queue.
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*
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* Calling Sequence:
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*
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*
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* Returns:
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* 0 on success, -1 if insufficient room, -2 on error
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* NOTE: if insufficient room, no characters are written.
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*
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*****************************************************************************/
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int uart3Write(const char *buffer, uint16_t count)
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{
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if (count > uart3Space())
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return -1;
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while (count && (uart3Putch(*buffer++) >= 0))
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count--;
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return (count ? -2 : 0);
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}
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/******************************************************************************
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*
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* Function Name: uart3TxEmpty()
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*
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* Description:
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* This function returns the status of the UART transmit data
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* registers.
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*
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* Calling Sequence:
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* void
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*
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* Returns:
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* FALSE - either the tx holding or shift register is not empty
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* !FALSE - if both the tx holding & shift registers are empty
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*
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*****************************************************************************/
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int uart3TxEmpty(void)
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{
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return (U3LSR & (ULSR_THRE | ULSR_TEMT)) == (ULSR_THRE | ULSR_TEMT);
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}
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int uart3RxEmpty(void)
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{
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if (uart3_rx_insert_idx == uart3_rx_extract_idx) // check if character is available
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{
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return 1;
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}
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else
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{
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return 0;
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}
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}
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/******************************************************************************
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*
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* Function Name: uart3TxFlush()
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*
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* Description:
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* This function removes all characters from the UART transmit queue
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* (without transmitting them).
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*
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* Calling Sequence:
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* void
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*
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* Returns:
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* void
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*
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*****************************************************************************/
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void uart3TxFlush(void)
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{
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unsigned cpsr;
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U3FCR |= UFCR_TX_FIFO_RESET; // clear the TX fifo
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// "Empty" the transmit buffer.
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cpsr = disableIRQ(); // disable global interrupts
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U3IER &= ~UIER_THRE; // disable TX interrupts
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restoreIRQ(cpsr); // restore global interrupts
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uart3_tx_insert_idx = uart3_tx_extract_idx = 0;
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}
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/******************************************************************************
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*
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* Function Name: uart3Getch()
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*
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* Description:
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* This function gets a character from the UART receive queue
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*
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* Calling Sequence:
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* void
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*
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* Returns:
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* character on success, -1 if no character is available
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*
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*****************************************************************************/
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int uart3Getch(void)
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{
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uint8_t ch;
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if (uart3_rx_insert_idx == uart3_rx_extract_idx) // check if character is available
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return -1;
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ch = uart3_rx_buffer[uart3_rx_extract_idx++]; // get character, bump pointer
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uart3_rx_extract_idx %= UART3_RX_BUFFER_SIZE; // limit the pointer
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return ch;
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}
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void uart3SubscribeTxFinished( t_uart3_txcomplete callback )
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{
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uart3_tx_complete_callback = callback;
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}
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void uart3UnsubsribeTxFinished( t_uart3_txcomplete callback )
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{
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uart3_tx_complete_callback = 0;
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}
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void uart3TxFinished(void)
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{
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if (uart3_tx_complete_callback != 0)
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{
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uart3_tx_complete_callback();
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}
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}
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