These are the examples provided for [[/users/frank26080115/libraries/LPC1700CMSIS_Lib/]] Note, the entire "program" is not compilable!
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 + +/* + * @} + */