\/\/example_adc_circle.c<\/p>\n\n\n\n
#ifdef IPS_ANALOG_IP<\/p>\n\n\n\n
#include \"example.h\"<\/p>\n\n\n\n
#include \"analog_ip.h\"<\/p>\n\n\n\n
\/\/
\/\/\u5f00\u542fDMA\u65b9\u5f0f\u6765\u5faa\u73af\u8bfb\u53d6ADC\u7684\u591a\u4e2achannal\u7684\u503c
\/\/\u8bfb\u5b8c\u540e\uff0c\u6570\u636e\u653e\u5230adc_table\u6570\u7ec4\u3002
\/\/
\/\/\u8fd9\u91cc\u7ed9\u51fa\u4e24\u4e2a\u793a\u4f8b:
\/\/\u4e00\u4e2a\u662f\u8c03\u7528\u4e86DMAC_ConfigCircular\uff0c\u8fd9\u4e2a\u51fd\u6570\u662fSDK1.3.2\u4ee5\u540e\u65b0\u589e\u7684\u3002\u4e00\u4e2a\u662f\u6ca1\u4f7f\u7528\u8fd9\u4e2a\u51fd\u6570\u7684\u3002
\/\/\u5176\u5b9e\u4e24\u4e2a\u793a\u4f8b\u6700\u7ec8\u8d70\u7684\u6d41\u7a0b\u90fd\u662f\u4e00\u6837\u7684\u3002<\/p>\n\n\n\n
static uint32_t sclk_div = 9; \/\/ Divided by 20 = (9 + 1) * 2
static uint32_t adc_table[2]; \/\/\u4ee5\u4e0b\u793a\u4f8b\u4e2d\u53ea\u91c7\u96c6\u4e86\u4e24\u8def\uff0c\u8fd9\u91cc\u5c31\u7ed92\u5c31\u884c\u4e86<\/p>\n\n\n\n
\/\/ \u6d4b\u8bd5\u5faa\u73af\u8bfb\u53d6ADC
DMAC_LLI_TypeDef circular_lli; \/\/\u5fc5\u987b\u5b9a\u4e49\u4e3a\u5168\u5c40\u6216\u9759\u6001\u53d8\u91cf\uff0c\u4e0d\u80fd\u662f\u5c40\u90e8\u53d8\u91cf\u3002\u56e0\u4e3aDMA\u5728\u8fd0\u884c\u4e2d\uff0c\u4f1a\u6301\u7eed\u4f7f\u7528\u3002\u5c40\u90e8\u53d8\u91cf\u5728\u9000\u51fa\u51fd\u6570\u540e\u4f1a\u91ca\u653e\u6389\u3002<\/p>\n\n\n\n
\/\/\u4f7f\u7528\u4e86DMAC_ConfigCircular\u51fd\u6570\u7684\u3002
void TestCircleAdc2()
{
PERIPHERAL_ENABLE(DMAC, 0);
DMAC_Init();<\/p>\n\n\n\n
ADC_SetSeqLength(ADC0, ADC_SEQ_LENGTH2); \/\/ \u8bbe\u7f6eDMA\u8981\u8bfb\u53d6\u7684ADC\u7684channal\u6570
ADC_SetSeqChannel(ADC0, 0, ADC_CHANNEL3); \/\/ channal-A\uff0c\u914d\u7f6e\u7b2c\u4e00\u4e2achannal\u3002\u7b2c\u4e8c\u4e2a\u53c2\u6570seq\u51b3\u5b9adma\u8bfb\u5b8c\u540e\u653e\u5230 adc_table \u7684\u54ea\u4e2a\u4f4d\u7f6e\u3002
ADC_SetSeqChannel(ADC0, 1, ADC_CHANNEL4); \/\/ channal-B\uff0c\u914d\u7f6e\u7b2c\u4e8c\u4e2achannal<\/p>\n\n\n\n
DMAC_ConfigCircular(DMAC_CHANNEL1, \/\/DMA\u7684channal\uff08\u8ddfADC\u7684channal\u65e0\u5173\uff09
(uint32_t)&ADC0->DATA, \/\/\u4ece\u54ea\u4e2aADC\u8bfb\u53d6
(uint32_t)adc_table, \/\/\u5b58\u653e\u6570\u636e\u7684\u6570\u7ec4
DMAC_ADDR_INCR_OFF, DMAC_ADDR_INCR_ON,
DMAC_WIDTH_32_BIT, DMAC_WIDTH_32_BIT, \/\/32\u4f4d\u7684\uff0c\u4e0d\u80fd\u662f16\u4f4d
DMAC_BURST_1, DMAC_BURST_1,
2, \/\/\u4e00\u8f6e\u8bfb\u53d6\u51e0\u4e2a\u3002\u8ddf\u4e0a\u8fb9\u7684channal\u6570\u5bf9\u5e94\u3002
DMAC_PERIPHERAL_TO_MEM_DMA_CTRL, ADC0_DMA_REQ, 0,
&circular_lli); \/\/lli\uff0c\u6ce8\u610f\u8fd9\u91cc\u8981\u52a0\u53d6\u503c\u7b26&
ADC_StartDma(ADC0, sclk_div); \/\/\u5f00\u542fDMA<\/p>\n\n\n\n
while(1)
{
printf(\"adc value:%d, %d\\r\\n\", adc_table[0], adc_table[1]);
UTIL_IdleUs(200e3);
}
}<\/p>\n\n\n\n
\/\/ \u6ca1\u6709\u4f7f\u7528 DMAC_ConfigCircular \u51fd\u6570\u3002
\/\/ \u8fd9\u91cc\u7684\u914d\u7f6e\u65b9\u6cd5\uff0c\u548c\u4e0a\u8fb9\u7684\u51fd\u6570\u662f\u4e00\u81f4\u7684\u3002\u6ce8\u91ca\u90e8\u5206\u53c2\u8003\u4e0a\u8fb9\u7684\u51fd\u6570\u3002
void TestCircleAdc()
{
PERIPHERAL_ENABLE(DMAC, 0);
DMAC_Init();<\/p>\n\n\n\n
ADC_SetSeqLength(ADC0, ADC_SEQ_LENGTH2); \/\/ Scan channels number
ADC_SetSeqChannel(ADC0, 0, ADC_CHANNEL3); \/\/ channal-A
ADC_SetSeqChannel(ADC0, 1, ADC_CHANNEL4); \/\/ channal-B<\/p>\n\n\n\n
circular_lli.SrcAddr = (uint32_t)&ADC0->DATA;
circular_lli.DstAddr = (uint32_t)adc_table;
circular_lli.LLI = (uint32_t)&circular_lli; \/\/ Points to itself for circular transfer
circular_lli.Control = DMAC_MakeControl(DMAC_ADDR_INCR_OFF, DMAC_ADDR_INCR_ON,
DMAC_WIDTH_32_BIT, DMAC_WIDTH_32_BIT, DMAC_BURST_1, DMAC_BURST_1, 2, DISABLE);
DMAC_ConfigLLI(DMAC_CHANNEL1, DMAC_PERIPHERAL_TO_MEM_DMA_CTRL, ADC0_DMA_REQ, 0, (uint32_t)&circular_lli);<\/p>\n\n\n\n
ADC_StartDma(ADC0, sclk_div);<\/p>\n\n\n\n
while(1)
{
printf(\"adc value:%d, %d\\r\\n\", adc_table[0], adc_table[1]);
UTIL_IdleUs(200e3);
}
}<\/p>\n\n\n\n
#endif<\/p>\n","protected":false},"excerpt":{"rendered":"
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