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https://gitee.com/Lyon1998/pikapython.git
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125 lines
3.2 KiB
C
125 lines
3.2 KiB
C
#define USE_STDPERIPH_DRIVER
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#include "stm32_p103.h"
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/* Flag whenever the button is pressed.
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* Note that the interrupt handler is initialized to only
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* fire when the button is pressed, not released.
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*/
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uint8_t button_pressed = 0;
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void EXTI0_IRQHandler(void)
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{
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/* Make sure the line has a pending interrupt
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* (should this always be true if we are inside the interrupt handle?) */
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if(EXTI_GetITStatus(EXTI_Line0) != RESET) {
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button_pressed = 1;
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EXTI_ClearITPendingBit(EXTI_Line0);
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}
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}
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/* ADC functions */
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void send_char(char x)
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{
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while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
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USART_SendData(USART1,x);
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}
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void send_str(char* str)
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{
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int x=0;
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while(str[x])
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send_char(str[x++]);
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}
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void send_nbr(int nbr)
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{
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if(nbr/10)
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send_nbr(nbr/10);
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send_char((nbr%10)+48);
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}
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void init_dac(void) {
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DAC_InitTypeDef DAC_InitStructure;
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GPIO_InitTypeDef GPIO_InitStructure;
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5 ;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
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GPIO_Init(GPIOA, &GPIO_InitStructure);
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DAC_InitStructure.DAC_Trigger=DAC_Trigger_Software;
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DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_Noise;//DAC_WaveGeneration_Triangle;//DAC_WaveGeneration_Noise
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DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude=DAC_LFSRUnmask_Bits3_0;//DAC_TriangleAmplitude_255; //DAC_LFSRUnmask_Bits3_0
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DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;
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DAC_Init(DAC_Channel_2, &DAC_InitStructure);
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DAC_Cmd(DAC_Channel_2, ENABLE);
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//set_DAC2_triangle_waveform_amplitude(peak);
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//enable_DAC2_channel(true);
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}
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void USART1_Init(void)
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{
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USART_InitTypeDef USART_InitStructure;
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GPIO_InitTypeDef GPIO_InitStructure;
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/* Configure USART1 Rx pin as floating input. */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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GPIO_Init(GPIOA, &GPIO_InitStructure);
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/* Configure USART1 Tx as alternate function push-pull. */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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GPIO_Init(GPIOA, &GPIO_InitStructure);
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/* Configure the USART1 */
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USART_InitStructure.USART_BaudRate = 9600;
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USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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USART_InitStructure.USART_StopBits = USART_StopBits_1;
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USART_InitStructure.USART_Parity = USART_Parity_No;
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USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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USART_Init(USART1, &USART_InitStructure);
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}
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void init_RCC()
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{
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOC | RCC_APB2Periph_USART1 | RCC_APB2Periph_AFIO, ENABLE);
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC ,ENABLE);
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}
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void sleep()
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{
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int i=1000000;
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while(i-->0);
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}
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int main(void)
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{
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/* Initialization */
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init_led();
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USART1_Init();
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init_dac();
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init_RCC();
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USART_Cmd(USART1, ENABLE);
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send_str("*******DEMO of DAC*******");
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DAC_SetChannel2Data(DAC_Align_12b_L,150<<4);
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while(1)
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{
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DAC->SWTRIGR=0x02;
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sleep();
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}
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return 0;
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}
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