These are the examples provided for [[/users/frank26080115/libraries/LPC1700CMSIS_Lib/]] Note, the entire "program" is not compilable!
Diff: DAC/DMA/dac_dma.c
- Revision:
- 0:bf7b9fba3924
diff -r 000000000000 -r bf7b9fba3924 DAC/DMA/dac_dma.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/DAC/DMA/dac_dma.c Sun Mar 20 05:38:56 2011 +0000 @@ -0,0 +1,198 @@ +/***********************************************************************//** + * @file dac_dma.c + * @purpose This example describes how to use DAC conversion and + * using DMA to transfer data + * @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_dac.h" +#include "lpc17xx_libcfg.h" +#include "lpc17xx_pinsel.h" +#include "lpc17xx_gpdma.h" + +/* Example group ----------------------------------------------------------- */ +/** @defgroup DAC_DMA DMA + * @ingroup DAC_Examples + * @{ + */ + +/************************** PRIVATE MACROS *************************/ +/** DMA size of transfer */ +#define DMA_SIZE 1 + +/************************** PRIVATE VARIABLES *************************/ +// Terminal Counter flag for Channel 0 +__IO uint32_t Channel0_TC; + +// Error Counter flag for Channel 0 +__IO uint32_t Channel0_Err; + +GPDMA_Channel_CFG_Type GPDMACfg; + +/************************** PRIVATE FUNCTION *************************/ +void DMA_IRQHandler (void); + + +/*----------------- INTERRUPT SERVICE ROUTINES --------------------------*/ +/*********************************************************************//** + * @brief GPDMA interrupt handler sub-routine + * @param[in] None + * @return None + **********************************************************************/ +void DMA_IRQHandler (void) +{ + // check GPDMA interrupt on channel 0 + if (GPDMA_IntGetStatus(GPDMA_STAT_INT, 0)){ + // Check counter terminal status + if(GPDMA_IntGetStatus(GPDMA_STAT_INTTC, 0)){ + GPDMA_ClearIntPending (GPDMA_STATCLR_INTTC, 0); + Channel0_TC++; + } + // Check error terminal status + if (GPDMA_IntGetStatus(GPDMA_STAT_INTERR, 0)){ + GPDMA_ClearIntPending (GPDMA_STATCLR_INTERR, 0); + Channel0_Err++; + } + } +} + + +/*-------------------------MAIN FUNCTION------------------------------*/ +/*********************************************************************//** + * @brief c_entry: Main DAC program body + * @param[in] None + * @return int + **********************************************************************/ +int c_entry(void) +{ + PINSEL_CFG_Type PinCfg; + DAC_CONVERTER_CFG_Type DAC_ConverterConfigStruct; + uint32_t dac_value =0; + uint32_t i; + /* + * Init DAC pin connect + * AOUT on P0.26 + */ + PinCfg.Funcnum = 2; + PinCfg.OpenDrain = 0; + PinCfg.Pinmode = 0; + PinCfg.Pinnum = 26; + PinCfg.Portnum = 0; + PINSEL_ConfigPin(&PinCfg); + + /* GPDMA block section -------------------------------------------- */ + + /* Disable GPDMA interrupt */ + NVIC_DisableIRQ(DMA_IRQn); + + /* preemption = 1, sub-priority = 1 */ + NVIC_SetPriority(DMA_IRQn, ((0x01<<3)|0x01)); + + DAC_ConverterConfigStruct.CNT_ENA =SET; + DAC_ConverterConfigStruct.DMA_ENA = SET; + DAC_Init(LPC_DAC); + /* set time out for DAC*/ + DAC_SetDMATimeOut(LPC_DAC,0xFFFF); + DAC_ConfigDAConverterControl(LPC_DAC, &DAC_ConverterConfigStruct); + + /* Initialize GPDMA controller */ + GPDMA_Init(); + + // Setup GPDMA channel -------------------------------- + // channel 0 + GPDMACfg.ChannelNum = 0; + // Source memory + GPDMACfg.SrcMemAddr = (uint32_t)(&dac_value); + // Destination memory - unused + GPDMACfg.DstMemAddr = 0; + // Transfer size + GPDMACfg.TransferSize = DMA_SIZE; + // Transfer width - unused + GPDMACfg.TransferWidth = 0; + // Transfer type + GPDMACfg.TransferType = GPDMA_TRANSFERTYPE_M2P; + // Source connection - unused + GPDMACfg.SrcConn = 0; + // Destination connection + GPDMACfg.DstConn = GPDMA_CONN_DAC; + // Linker List Item - unused + GPDMACfg.DMALLI = 0; + // Setup channel with given parameter + GPDMA_Setup(&GPDMACfg); + + /* Reset terminal counter */ + Channel0_TC = 0; + /* Reset Error counter */ + Channel0_Err = 0; + + /* Enable GPDMA interrupt */ + NVIC_EnableIRQ(DMA_IRQn); + + /* Wait for GPDMA processing complete */ + while (1) { + + // Enable GPDMA channel 0 + GPDMA_ChannelCmd(0, ENABLE); + + while ((Channel0_TC == 0) ); + + // Disable GPDMA channel 0 + GPDMA_ChannelCmd(0, DISABLE); + + dac_value ++; + if (dac_value == 0x3FF) dac_value =0; + //delay + for(i=0;i<100000;i++); + + /* Reset terminal counter */ + Channel0_TC = 0; + + // Re-setup channel + GPDMA_Setup(&GPDMACfg); + } + + 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 + +/* + * @} + */