Diff: UART/DMA/uart_dma_test.c

Revision:

0:bf7b9fba3924

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/UART/DMA/uart_dma_test.c	Sun Mar 20 05:38:56 2011 +0000
@@ -0,0 +1,321 @@
+/***********************************************************************//**
+ * @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	0x10
+
+/************************** 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 *************************/
+void DMA_IRQHandler (void);
+
+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;
+
+	/*
+	 * 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_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_UART0, &UARTFIFOConfigStruct);
+
+	// Enable UART Transmit
+	UART_TxCmd(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);
+
+	// Enable GPDMA channel 0
+	GPDMA_ChannelCmd(0, ENABLE);
+	// Make sure GPDMA channel 1 is disabled
+	GPDMA_ChannelCmd(1, DISABLE);
+
+	/* Wait for GPDMA on UART0 Tx processing complete */
+    while ((Channel0_TC == 0) && (Channel0_Err == 0));
+
+    // Main loop - echos back to the terminal
+    while (1)
+    {
+    	/* 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_UART0, rx_char, 1, BLOCKING);
+				rx_char++;
+			}
+        }
+    }
+
+    // DeInitialize UART0 peripheral
+    UART_DeInit(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
+
+/*
+ * @}
+ */