Diff: uart_dma_test.c

Revision:

0:7480abd3b63b

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/uart_dma_test.c	Thu Sep 30 20:13:24 2010 +0000
@@ -0,0 +1,359 @@
+/***********************************************************************//**
+ * 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
+
+/*
+ * @}
+ */