STM32 —— 多路DAC（输出电压和正弦波）

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1. //========================================DAC=========================================  
2. #define DA_OUT1_CHANNEL    DAC_Channel_1  
3. #define DA_OUT1_GRP        GPIOA  
4. #define DA_OUT1_INDEX      GPIO_Pin_4  
5. #define DA_OUT1_HIGH()     GPIO_SetBits(DA_OUT1_GRP, DA_OUT1_INDEX)  
6. #define DA_OUT1_CONFIG()   GPIOConfig(DA_OUT1_GRP, DA_OUT1_INDEX, GPIO_Mode_AIN)  
7.   
8. #define DA_OUT2_CHANNEL    DAC_Channel_2  
9. #define DA_OUT2_GRP        GPIOA  
10. #define DA_OUT2_INDEX      GPIO_Pin_5  
11. #define DA_OUT2_HIGH()     GPIO_SetBits(DA_OUT2_GRP, DA_OUT2_INDEX)  
12. #define DA_OUT2_CONFIG()   GPIOConfig(DA_OUT2_GRP, DA_OUT2_INDEX, GPIO_Mode_AIN)  

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1. #ifndef _DAC_H_  
2. #define _DAC_H_  
3.   
4. void DAC1Init(void);  
5. void DAC1OutVoltage(float data);  
6. void DAC2Init(void);  
7.   
8. #endif /* _DAC_H_ */  

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1. #include "dac.h"  
2. //#include "target.h"  
3. #include "type.h"  
4.   
5. #define DAC_DHR12RD_ADDRESS      0x40007420  
6.   
7. static const uint16_t sin[32] =  
8.   
9.   2047, 2447, 2831, 3185, 3498, 3750, 3939, 4056, 4095, 4056,  
10.   3939, 3750, 3495, 3185, 2831, 2447, 2047, 1647, 1263, 909,  
11.   599, 344, 155, 38, 0, 38, 155, 344, 599, 909, 1263, 1647  
12.   
13. ;  
14. static uint32_t dual_sin[32];  
15. static uint8_t index = 0;  
16. // PA4  
17. static void dac1_clk_init(void)  
18.   
19.   RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);  
20.   
21.   
22. static void dac1_gpio_init(void)  
23.   
24.   DA_OUT1_CONFIG();  
25.   DA_OUT1_HIGH();  
26.   
27.   
28. static void dac1_mode_init(void)  
29.   
30.   DAC_InitTypeDef DAC_InitStructure;  
31.   
32.   DAC_InitStructure.DAC_Trigger = DAC_Trigger_Software;  
33.   DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;  
34.   DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = DAC_LFSRUnmask_Bits11_0;  
35.   DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;  
36.   DAC_Init(DA_OUT1_CHANNEL, &DAC_InitStructure);  
37.   
38.   DAC_Cmd(DA_OUT1_CHANNEL, ENABLE);  
39.   
40.   
41. void DAC1Init(void)  
42.   
43.   dac1_clk_init();  
44.   dac1_gpio_init();  
45.   dac1_mode_init();  
46.   
47.   
48. // DAC1OutVoltage(1.5);// 1.5V out  
49. void DAC1OutVoltage(float data)  
50.   
51.   uint16_t value;  
52.   
53.   value = (uint16_t)((data / 3.3) * 4096);  
54.   
55.   DAC_SetChannel1Data(DAC_Align_12b_R, value);  
56.   DAC_SoftwareTriggerCmd(DA_OUT1_CHANNEL, ENABLE);  
57.   
58.   
59. static void dac2_clk_init(void)  
60.   
61.   RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE);  
62.   RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);  
63.   RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE);  
64.   
65.   
66. static void dac2_gpio_init(void)  
67.   
68.   DA_OUT2_CONFIG();  
69.   DA_OUT2_HIGH();  
70.   
71.   
72. static void dac2_timer_init(void)  
73.   
74.   TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;  
75.   
76.   TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);  
77.   TIM_TimeBaseStructure.TIM_Period = 0x19;  
78.   TIM_TimeBaseStructure.TIM_Prescaler = 0x0;  
79.   TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;  
80.   TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  
81.   TIM_TimeBaseInit(TIM8, &TIM_TimeBaseStructure);  
82.   
83.   /* TIM8 TRGO selection */  
84.   TIM_SelectOutputTrigger(TIM8, TIM_TRGOSource_Update);  
85.   
86.   
87. static void dac2_mode_init(void)  
88.   
89.   DAC_InitTypeDef DAC_InitStructure;  
90.   
91.   /* DAC channel2 Configuration */  
92.   DAC_InitStructure.DAC_Trigger = DAC_Trigger_T8_TRGO;  
93.   DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;  
94.   DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable;  
95.   DAC_Init(DA_OUT2_CHANNEL, &DAC_InitStructure);  
96.   
97.   for(index = 0; index < 32; ++index)  
98.     
99.     dual_sin[index] = (sin[index] << 16) + sin[index];  
100.     
101.   
102.