国产16位MCU的痛点，可以用这款物美价廉产品（附完整开发过程）
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/******************************************************************************** Definitions******************************************************************************/#define DEMO_ADC16_CHANNEL 1U#define DEMO_ADC16_CHANNEL_GROUP 0U#define DEMO_ADC16_BASEADDR ADC0#define DEMO_DMAMUX_BASEADDR DMAMUX0#define DEMO_DMA_CHANNEL 1U#define DEMO_DMA_ADC0_SOURCE 40U#define DEMO_DMA_ADC1_SOURCE 41U#define DEMO_DMA_BASEADDR DMA0#define ADC16_RESULT_REG_ADDR 0x4003b010U#define ADC16_RESULT_REG_ADDR1 0x40027010U//查询寄存器手册得到#define DEMO_DMA_IRQ_ID DMA0_IRQn
#define DEMO_ADC16_SAMPLE_COUNT 8U /* The ADC16 sample count. *//************************************************************************************************************************ ADC0 initialization code**********************************************************************************************************************/adc16_channel_config_t ADC0_channelsConfig[1] = { { .channelNumber = 1U, //传输通道 .enableDifferentialConversion = true, //差分模式 .enableInterruptOnConversionCompleted = false, //使能传输完成中断 }};const adc16_config_t ADC0_config = { .referenceVoltageSource = kADC16_ReferenceVoltageSourceVref, .clockSource = 0, .enableAsynchronousClock = false, .clockDivider = kADC16_ClockDivider1, .resolution = kADC16_ResolutionSE16Bit, .longSampleMode = kADC16_LongSampleDisabled, .enableHighSpeed = true, .enableLowPower = false, .enableContinuousConversion = false//连续的转换};const adc16_channel_mux_mode_t ADC0_muxMode = kADC16_ChannelMuxA;/* 硬件平均 8 */const adc16_hardware_average_mode_t ADC0_hardwareAverageMode = kADC16_HardwareAverageDisabled;void ADC0_init(void) { /* Initialize ADC16 converter */ ADC16_Init(ADC0_PERIPHERAL, &ADC0_config); /* Make sure, that software trigger is used */ ADC16_EnableHardwareTrigger(ADC0_PERIPHERAL, false); /* Configure hardware average mode */ ADC16_SetHardwareAverage(ADC0_PERIPHERAL, ADC0_hardwareAverageMode); /* Configure channel multiplexing mode */ ADC16_SetChannelMuxMode(ADC0_PERIPHERAL, ADC0_muxMode); /* Initialize channel */ ADC16_SetChannelConfig(ADC0_PERIPHERAL, 0U, &ADC0_channelsConfig[0]); /* Perform auto calibration */ ADC16_DoAutoCalibration(ADC0_PERIPHERAL); /* Enable DMA. */ ADC16_EnableDMA(ADC0_PERIPHERAL, false);}/************************************************************************************************************************ ADC1 initialization code**********************************************************************************************************************/adc16_channel_config_t ADC1_channelsConfig[1] = { { .channelNumber = 2U, .enableDifferentialConversion = true, //差分模式 .enableInterruptOnConversionCompleted = false, }};const adc16_config_t ADC1_config = { .referenceVoltageSource = kADC16_ReferenceVoltageSourceVref, .clockSource = 0, .enableAsynchronousClock = false, .clockDivider = kADC16_ClockDivider1, .resolution = kADC16_ResolutionSE16Bit, .longSampleMode = kADC16_LongSampleDisabled, .enableHighSpeed = true, .enableLowPower = false, .enableContinuousConversion = false//连续的转换};const adc16_channel_mux_mode_t ADC1_muxMode = kADC16_ChannelMuxA;const adc16_hardware_average_mode_t ADC1_hardwareAverageMode = kADC16_HardwareAverageDisabled;void ADC1_init(void) {// EnableIRQ(ADC0_IRQn); /* 初始化ADC16转换器 */ ADC16_Init(ADC1_PERIPHERAL, &ADC1_config); /* 不使用软件触发器 */ ADC16_EnableHardwareTrigger(ADC1_PERIPHERAL, false); /* 配置硬件平均模式 */ ADC16_SetHardwareAverage(ADC1_PERIPHERAL, ADC1_hardwareAverageMode); /* 配置信道多路复用模式 */ ADC16_SetChannelMuxMode(ADC1_PERIPHERAL, ADC1_muxMode); /* 初始化通道 */ ADC16_SetChannelConfig(ADC1_PERIPHERAL, 1U, &ADC1_channelsConfig[0]); /* 自动校准 */ ADC16_DoAutoCalibration(ADC1_PERIPHERAL); /* Enable DMA. */ ADC16_EnableDMA(ADC1_PERIPHERAL, false);
}adc16_channel_config_t adc16ChannelConfigStruct;adc16ChannelConfigStruct.channelNumber = 1; //ADC通道adc16ChannelConfigStruct.channelNumber = 2;adc16ChannelConfigStruct.enableDifferentialConversion = true;//使能差分adc16ChannelConfigStruct.enableInterruptOnConversionCompleted = false;//失能中断ADC16_SetChannelConfig(ADC1, 0U, &adc16ChannelConfigStruct);ADC16_SetChannelConfig(ADC0, 0U, &adc16ChannelConfigStruct);while (0U == (kADC16_ChannelConversionDoneFlag &ADC16_GetChannelStatusFlags(ADC1, 0U)));ADC_Value0 = ADC16_GetChannelConversionValue(ADC0, 0U);ADC_Value1 = ADC16_GetChannelConversionValue(ADC1, 0U);
void EDMA_Configuration(void){ edma_config_t userConfig; /* 配置 DMAMUX */ DMAMUX_Init(DMAMUX); /* 通道CH1初始化 */ DMAMUX_SetSource(DMAMUX, 1, 40); /* Map ADC0 source to channel 1 */ DMAMUX_EnableChannel(DMAMUX, 1); /* 通道CH2初始化 */ DMAMUX_SetSource(DMAMUX, 2, 41);/* Map ADC1 source to channel 2 */ DMAMUX_EnableChannel(DMAMUX, 2); /* 获取eDMA默认配置结构 */ EDMA_GetDefaultConfig(&userConfig); EDMA_Init(DMA0, &userConfig); EDMA_CreateHandle(&g_EDMA_Handle, DMA0, 1); /* 设置回调 */ EDMA_SetCallback(&g_EDMA_Handle, Edma_Callback, NULL); /*eDMA传输结构配置 .设置dma通道1的adc值传到g_adc16SampleDataArray*/ EDMA_PrepareTransfer(&transferConfig, (void *)ADC16_RESULT_REG_ADDR, sizeof(uint32_t), (void *)g_adc16SampleDataArray, sizeof(uint32_t), sizeof(uint32_t), sizeof(g_adc16SampleDataArray), kEDMA_PeripheralToMemory); EDMA_SubmitTransfer(&g_EDMA_Handle, &transferConfig); /* Enable interrupt when transfer is done. */ EDMA_EnableChannelInterrupts(DEMO_DMA_BASEADDR, DEMO_DMA_CHANNEL, kEDMA_MajorInterruptEnable);#if defined(FSL_FEATURE_EDMA_ASYNCHRO_REQUEST_CHANNEL_COUNT) && FSL_FEATURE_EDMA_ASYNCHRO_REQUEST_CHANNEL_COUNT /* Enable async DMA request. */ EDMA_EnableAsyncRequest(DEMO_DMA_BASEADDR, DEMO_DMA_CHANNEL, true);#endif /* FSL_FEATURE_EDMA_ASYNCHRO_REQUEST_CHANNEL_COUNT */ /* Enable transfer. */ EDMA_StartTransfer(&g_EDMA_Handle); //将dma通道1链接到通道0 EDMA_SetChannelLink(DMA0, 1, kEDMA_MinorLink, 2); EDMA_SetChannelLink(DMA0, 1, kEDMA_MajorLink,2);
//*********************************************************************************************/ EDMA_CreateHandle(&DMA_CH2_Handle, DMA0, 2); EDMA_SetCallback(&DMA_CH2_Handle, Edma_Callback1, NULL); /* 设置回调 */ EDMA_PrepareTransfer(&g_transferConfig, (void *)ADC16_RESULT_REG_ADDR1, sizeof(uint32_t), (void *)g_adc16SampleDataArray1, sizeof(uint32_t), sizeof(uint32_t), sizeof(g_adc16SampleDataArray1), kEDMA_PeripheralToMemory); EDMA_SubmitTransfer(&DMA_CH2_Handle, &g_transferConfig); //传输完后修正通道 DMA0->TCD[1].DLAST_SGA = -1* sizeof(g_adc16SampleDataArray); DMA0->TCD[2].DLAST_SGA = -1* sizeof(g_adc16SampleDataArray1); /* 当传输完成时启用中断. */ EDMA_EnableChannelInterrupts(DEMO_DMA_BASEADDR, 2, kEDMA_MajorInterruptEnable);#if defined(FSL_FEATURE_EDMA_ASYNCHRO_REQUEST_CHANNEL_COUNT) && FSL_FEATURE_EDMA_ASYNCHRO_REQUEST_CHANNEL_COUNT// /* 启用异步DMA请求 */ EDMA_EnableAsyncRequest(DEMO_DMA_BASEADDR, 2, true);#endif /* FSL_FEATURE_EDMA_ASYNCHRO_REQUEST_CHANNEL_COUNT */ /* 使能数据传输 */ EDMA_StartTransfer(&DMA_CH2_Handle); }DAM 通道1和通道2的callback函数。static void Edma_Callback(edma_handle_t *handle, void *userData, bool transferDone, uint32_t tcds){ EDMA_StartTransfer(&g_EDMA_Handle); g_Transfer_Done = false; if (transferDone) { g_Transfer_Done = true; }}static void Edma_Callback1(edma_handle_t *handle, void *userData, bool transferDone, uint32_t tcds){ g_Transfer_Done1 = false; if (transferDone) { g_Transfer_Done1 = true; }}
至此ADC的DMA就完成了，ADC会一直采集并通过DMA传输到g_adc16SampleDataArray[]和g_adc16SampleDataArray1[]两个数组中，需要时可以直接取值。我在使用ADC的DMA连续采样时遇到一个问题，因为连续采样会触发callback函数，此过程会触发edma中断，容易打断原来代码的进程，如在高速应用中使用需注意。
芯片的入门环境搭建
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