File content as of revision 0:7480abd3b63b:

/***********************************************************************//**
 * tweaked by dps.lwk to work with mbed's online complier
 * 30/09/2010
 **********************************************************************/ 

/***********************************************************************//**
 * @file        uart_dma_test.c
 * @purpose        This example describes how to using UART in DMA mode
 * @version        2.0
 * @date        21. May. 2010
 * @author        NXP MCU SW Application Team
 *---------------------------------------------------------------------
 * Software that is described herein is for illustrative purposes only
 * which provides customers with programming information regarding the
 * products. This software is supplied "AS IS" without any warranties.
 * NXP Semiconductors assumes no responsibility or liability for the
 * use of the software, conveys no license or title under any patent,
 * copyright, or mask work right to the product. NXP Semiconductors
 * reserves the right to make changes in the software without
 * notification. NXP Semiconductors also make no representation or
 * warranty that such application will be suitable for the specified
 * use without further testing or modification.
 **********************************************************************/
#include "lpc17xx_uart.h"
#include "lpc17xx_libcfg.h"
#include "lpc17xx_gpdma.h"
#include "lpc17xx_pinsel.h"

/* Example group ----------------------------------------------------------- */
/** @defgroup UART_DMA    DMA
 * @ingroup UART_Examples
 * @{
 */

/************************** PRIVATE DEFINITIONS *************************/
/* Receive buffer size */
#define RX_BUF_SIZE    0x80     // ***LWK*** uped buffer to 128bytes

/************************** PRIVATE VARIABLES *************************/
uint8_t menu1[] =
"Hello NXP Semiconductors \n\r"
"UART interrupt mode demo using ring buffer \n\r\t "
"MCU LPC17xx - ARM Cortex-M3 \n\r\t "
"UART0 - 9600bps \n\r"
" This is a long string. It transferred in to DMA memory and transmit through Tx line \n\r"
" on UART0 peripheral. To use UART with DMA mode, FIFO function must be enabled \n\r";

uint8_t menu3[] = "UART demo terminated!\n";

// Receive buffer
__IO uint8_t rx_buf[RX_BUF_SIZE];

// Terminal Counter flag for Channel 0
__IO uint32_t Channel0_TC;

// Error Counter flag for Channel 0
__IO uint32_t Channel0_Err;

// Terminal Counter flag for Channel 1
__IO uint32_t Channel1_TC;

// Error Counter flag for Channel 1
__IO uint32_t Channel1_Err;


/************************** PRIVATE FUNCTIONS *************************/
extern "C" void DMA_IRQHandler (void);          // ***LWK*** mbed requires IRQHandeler to be extern "C"

void print_menu(void);

/*----------------- INTERRUPT SERVICE ROUTINES --------------------------*/
/*********************************************************************//**
 * @brief        GPDMA interrupt handler sub-routine
 * @param[in]    None
 * @return         None
 **********************************************************************/
void DMA_IRQHandler (void)
{
    
  
    uint32_t tmp;
        // Scan interrupt pending
    for (tmp = 0; tmp <= 7; tmp++) {
        if (GPDMA_IntGetStatus(GPDMA_STAT_INT, tmp)){
            // Check counter terminal status
            if(GPDMA_IntGetStatus(GPDMA_STAT_INTTC, tmp)){
                // Clear terminate counter Interrupt pending
                GPDMA_ClearIntPending (GPDMA_STATCLR_INTTC, tmp);

                switch (tmp){
                    case 0:
                        Channel0_TC++;
                        GPDMA_ChannelCmd(0, DISABLE);
                        break;
                    case 1:
                        Channel1_TC++;
                        GPDMA_ChannelCmd(1, DISABLE);
                        break;
                    default:
                        break;
                }

            }
                // Check error terminal status
            if (GPDMA_IntGetStatus(GPDMA_STAT_INTERR, tmp)){
                // Clear error counter Interrupt pending
                GPDMA_ClearIntPending (GPDMA_STATCLR_INTERR, tmp);
                switch (tmp){
                    case 0:
                        Channel0_Err++;
                        GPDMA_ChannelCmd(0, DISABLE);
                        break;
                    case 1:
                        Channel1_Err++;
                        GPDMA_ChannelCmd(1, DISABLE);
                        break;
                    default:
                        break;
                }
            }
        }
    }
}

/*-------------------------MAIN FUNCTION------------------------------*/
/*********************************************************************//**
 * @brief        c_entry: Main UART program body
 * @param[in]    None
 * @return         int
 **********************************************************************/
int c_entry(void)
{
    uint8_t *rx_char;
    uint32_t idx;
    // UART Configuration structure variable
    UART_CFG_Type UARTConfigStruct;
    // UART FIFO configuration Struct variable
    UART_FIFO_CFG_Type UARTFIFOConfigStruct;
    GPDMA_Channel_CFG_Type GPDMACfg;
    // Pin configuration for UART0
    PINSEL_CFG_Type PinCfg;

    // ***LWK*** setup pins for debug leds
    LPC_GPIO1->FIODIR |= 0xb40000;
    LPC_GPIO1->FIOMASK = 0xff4bffff;

    /*
     * Initialize UART0 pin connect
     */
    PinCfg.Funcnum = 1;
    PinCfg.OpenDrain = 0;
    PinCfg.Pinmode = 0;
    PinCfg.Pinnum = 2;
    PinCfg.Portnum = 0;
    PINSEL_ConfigPin(&PinCfg);
    PinCfg.Pinnum = 3;
    PINSEL_ConfigPin(&PinCfg);

    /* Initialize UART Configuration parameter structure to default state:
     * Baudrate = 9600bps
     * 8 data bit
     * 1 Stop bit
     * None parity
     */
    UART_ConfigStructInit(&UARTConfigStruct);

    // Initialize UART0 peripheral with given to corresponding parameter
    UART_Init((LPC_UART_TypeDef *)LPC_UART0, &UARTConfigStruct);


    /* Initialize FIFOConfigStruct to default state:
     *                 - FIFO_DMAMode = DISABLE
     *                 - FIFO_Level = UART_FIFO_TRGLEV0
     *                 - FIFO_ResetRxBuf = ENABLE
     *                 - FIFO_ResetTxBuf = ENABLE
     *                 - FIFO_State = ENABLE
     */
    UART_FIFOConfigStructInit(&UARTFIFOConfigStruct);

    // Enable DMA mode in UART
    UARTFIFOConfigStruct.FIFO_DMAMode = ENABLE;

    // Initialize FIFO for UART0 peripheral
    UART_FIFOConfig((LPC_UART_TypeDef *)LPC_UART0, &UARTFIFOConfigStruct);

    // Enable UART Transmit
    UART_TxCmd((LPC_UART_TypeDef *)LPC_UART0, ENABLE);


    /* GPDMA Interrupt configuration section ------------------------------------------------- */

    /* Initialize GPDMA controller */
    GPDMA_Init();


    /* Setting GPDMA interrupt */
    // Disable interrupt for DMA
    NVIC_DisableIRQ (DMA_IRQn);
    /* preemption = 1, sub-priority = 1 */
    NVIC_SetPriority(DMA_IRQn, ((0x01<<3)|0x01));


    // Setup GPDMA channel --------------------------------
    // channel 0
    GPDMACfg.ChannelNum = 0;
    // Source memory
    GPDMACfg.SrcMemAddr = (uint32_t) &menu1;
    // Destination memory - don't care
    GPDMACfg.DstMemAddr = 0;
    // Transfer size
    GPDMACfg.TransferSize = sizeof(menu1);
    // Transfer width - don't care
    GPDMACfg.TransferWidth = 0;
    // Transfer type
    GPDMACfg.TransferType = GPDMA_TRANSFERTYPE_M2P;
    // Source connection - don't care
    GPDMACfg.SrcConn = 0;
    // Destination connection
    GPDMACfg.DstConn = GPDMA_CONN_UART0_Tx;
    // Linker List Item - unused
    GPDMACfg.DMALLI = 0;
    // Setup channel with given parameter
    GPDMA_Setup(&GPDMACfg);

    // Setup GPDMA channel --------------------------------
    // channel 1
    GPDMACfg.ChannelNum = 1;
    // Source memory - don't care
    GPDMACfg.SrcMemAddr = 0;
    // Destination memory
    GPDMACfg.DstMemAddr = (uint32_t) &rx_buf;
    // Transfer size
    GPDMACfg.TransferSize = sizeof(rx_buf);
    // Transfer width - don't care
    GPDMACfg.TransferWidth = 0;
    // Transfer type
    GPDMACfg.TransferType = GPDMA_TRANSFERTYPE_P2M;
    // Source connection
    GPDMACfg.SrcConn = GPDMA_CONN_UART0_Rx;
    // Destination connection - don't care
    GPDMACfg.DstConn = 0;
    // Linker List Item - unused
    GPDMACfg.DMALLI = 0;
    GPDMA_Setup(&GPDMACfg);

    /* Reset terminal counter */
    Channel0_TC = 0;
    /* Reset Error counter */
    Channel0_Err = 0;

    // Enable interrupt for DMA
    NVIC_EnableIRQ (DMA_IRQn);

    // ***LWK*** First debug LED1 on
    LPC_GPIO1->FIOSET = (1<<18);
    
    // Enable GPDMA channel 0
    GPDMA_ChannelCmd(0, ENABLE);
    // Make sure GPDMA channel 1 is disabled
    GPDMA_ChannelCmd(1, DISABLE);
    
    // ***LWK*** DEBUG LED 2 on
    LPC_GPIO1->FIOSET = (1<<20);
    
    
    /* Wait for GPDMA on UART0 Tx processing complete */
    while ((Channel0_TC == 0) && (Channel0_Err == 0));          // ***LWK*** got stuck here!!! untill i found out the IRQHandeler needed extern "C"
    
    // ***LWK** LED 1 off
    LPC_GPIO1->FIOCLR = (1<<18);
    
    LPC_GPIO1->FIOCLR = (11<<20);    
    // Main loop - echos back to the terminal
    while (1)
    {
        //***LWK*** debug LED

        LPC_GPIO1->FIOSET = (1<<21);  //***LWK*** led 3 in while
    
        /* Reset terminal counter */
        Channel1_TC = 0;
        /* Reset Error counter */
        Channel1_Err = 0;

        // Setup channel with given parameter
        GPDMA_Setup(&GPDMACfg);

        // Enable GPDMA channel 1
        GPDMA_ChannelCmd(1, ENABLE);

        // Clear Rx buffer using DMA
        for (idx = 0; idx < RX_BUF_SIZE; idx++){
            rx_buf[idx] = 0;
        }
        

        
        // now, start receive character using GPDMA
        rx_char = (uint8_t *) &rx_buf;
        while ((Channel1_TC == 0) && (Channel1_Err == 0)){
            // Check whether if there's any character received, then print it back
            if (*rx_char != 0)
            {
                UART_Send((LPC_UART_TypeDef *)LPC_UART0, rx_char, 1, BLOCKING);
        
                //***LWK*** debug LED
    //            LPC_GPIO1->FIOSET = (1<<21);    
                rx_char++;
            }
        }
        
        //***LWK*** debug LED out of while eithe tc or err
        LPC_GPIO1->FIOSET = (1<<23);
        
    }

    //***LWK*** debug LED
 //   LPC_GPIO1->FIOSET = (1<<23);

    // DeInitialize UART0 peripheral
    UART_DeInit((LPC_UART_TypeDef *)LPC_UART0);

    /* Loop forever */
    while(1);
    return 1;
}

/* With ARM and GHS toolsets, the entry point is main() - this will
   allow the linker to generate wrapper code to setup stacks, allocate
   heap area, and initialize and copy code and data segments. For GNU
   toolsets, the entry point is through __start() in the crt0_gnu.asm
   file, and that startup code will setup stacks and data */
int main(void)
{
    return c_entry();
}


#ifdef  DEBUG
/*******************************************************************************
* @brief        Reports the name of the source file and the source line number
*                 where the CHECK_PARAM error has occurred.
* @param[in]    file Pointer to the source file name
* @param[in]    line assert_param error line source number
* @return        None
*******************************************************************************/
void check_failed(uint8_t *file, uint32_t line)
{
    /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

    /* Infinite loop */
    while(1);
}
#endif

/*
 * @}
 */