2019 8 9 STM32F407ADS1526连续转换模式相关配置（采样率达到15000SPS）
作者：互联网
没有试30000sps
采样率低可能还不能用，需要改变SPI速率等
使用ADS1256DRDY引脚作中断触发进行数据采集
main.c中：
1 if (state)
2 {
3 ADS1256WREG(ADS1256_MUX,(0 << 4) | ADS1256_MUXN_AINCOM); //ÉèÖÃͨµÀ
4
5 GPIO_ResetBits(GPIOB, GPIO_Pin_6);;
6 while(GPIO_ReadInputDataBit(GPIO_ADS1256DRDY_PORT,GPIO_ADS1256DRDY)); //µ±ADS1256_DRDYΪµÍʱ²ÅÄÜд¼Ä´æÆ÷
7 // ADS1256WREG(ADS1256_MUX,channel); //ÉèÖÃͨµÀ
8 SPI_WriteByte(ADS1256_CMD_SYNC);
9 // while(GPIO_ReadInputDataBit(GPIO_ADS1256DRDY_PORT,GPIO_ADS1256DRDY));
10 SPI_WriteByte(ADS1256_CMD_WAKEUP);
11 while(GPIO_ReadInputDataBit(GPIO_ADS1256DRDY_PORT,GPIO_ADS1256DRDY));
12 SPI_WriteByte(ADS1256_CMD_RDATAC);
13 while(GPIO_ReadInputDataBit(GPIO_ADS1256DRDY_PORT,GPIO_ADS1256DRDY));
14 TIM_Cmd(TIM4, ENABLE); //ʹÄÜTIMxÍâÉè
15 delay_us(8);
16 state = 0;
17 }
外部中断：
u8 state=1;
long double getval[15010];
static u32 i;
//ÍⲿÖжÏ0·þÎñ³ÌÐò
void EXTI9_5_IRQHandler(void)
{
long ulResult;
long double ldVolutage;
if(EXTI_GetITStatus(EXTI_Line8)!=RESET)
{
// ADS1256WREG(ADS1256_MUX,(0 << 4) | ADS1256_MUXN_AINCOM); //ÉèÖÃͨµÀ
//
// GPIO_ResetBits(GPIOB, GPIO_Pin_6);;
// while(GPIO_ReadInputDataBit(GPIO_ADS1256DRDY_PORT,GPIO_ADS1256DRDY)); //µ±ADS1256_DRDYΪµÍʱ²ÅÄÜд¼Ä´æÆ÷
// // ADS1256WREG(ADS1256_MUX,channel); //ÉèÖÃͨµÀ
// SPI_WriteByte(ADS1256_CMD_SYNC);
// // while(GPIO_ReadInputDataBit(GPIO_ADS1256DRDY_PORT,GPIO_ADS1256DRDY));
// SPI_WriteByte(ADS1256_CMD_WAKEUP);
// while(GPIO_ReadInputDataBit(GPIO_ADS1256DRDY_PORT,GPIO_ADS1256DRDY));
// SPI_WriteByte(ADS1256_CMD_RDATA);
// while(GPIO_ReadInputDataBit(GPIO_ADS1256DRDY_PORT,GPIO_ADS1256DRDY));
// delay_us(8);
//
if(i<15000)
{
ulResult |= (SPI_WriteByte(0xff) << 16);
ulResult |= (SPI_WriteByte(0xff) << 8);
ulResult |= SPI_WriteByte(0xff);
state = 1;
if( ulResult & 0x800000 )
{
ulResult = ~(unsigned long)ulResult;
ulResult &= 0x7fffff;
ulResult += 1;
ulResult = -ulResult;
}
getval[i++] = (long double)ulResult*5/8388607;
// i++;
// printf("i = %d\r\n",i);
// printf("%lf",ldVolutage); //double
// printf("V\r\n");
}
else
{
// for(int t = 0;t<i;t++)
// {
// printf("t = %d\r\n",t);
// printf("%lf",getval[t]); //double
// printf("V\r\n");
// }
i=0;
}
}
EXTI_ClearITPendingBit(EXTI_Line8); //Çå³ýLINE0ÉϵÄÖжϱê־λ
}
//ÍⲿÖжϳõʼ»¯³ÌÐò
//³õʼ»¯PE2~4,PA0ΪÖжÏÊäÈë.
void EXTIX_Init(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
// KEY_Init(); //°´¼ü¶ÔÓ¦µÄIO¿Ú³õʼ»¯
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);//ʹÄÜSYSCFGʱÖÓ
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB, EXTI_PinSource8);//PB8 Á¬½Óµ½ÖжÏÏß8
/* ÅäÖÃEXTI_Line2,3,4 */
EXTI_InitStructure.EXTI_Line = EXTI_Line8;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;//ÖжÏʼþ
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; //下降沿触发
EXTI_InitStructure.EXTI_LineCmd = ENABLE;//ÖжÏÏßʹÄÜ
EXTI_Init(&EXTI_InitStructure);//ÅäÖÃ
NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;//ÍⲿÖжÏ0
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;//ÇÀÕ¼ÓÅÏȼ¶0
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x02;//×ÓÓÅÏȼ¶2
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//ʹÄÜÍⲿÖжÏͨµÀ
NVIC_Init(&NVIC_InitStructure);//ÅäÖÃ
}
ADS1256配置
void SPI1_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
// RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);//ʹÄÜGPIOBʱÖÓ
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);//ʹÄÜSPI1ʱÖÓ
//GPIOFB3,4,5³õʼ»¯ÉèÖÃ
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5;//PB3~5¸´Óù¦ÄÜÊä³ö
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//¸´Óù¦ÄÜ
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//ÍÆÍìÊä³ö
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//ÉÏÀ
GPIO_Init(GPIOB, &GPIO_InitStructure);//³õʼ»¯
GPIO_PinAFConfig(GPIOB,GPIO_PinSource3,GPIO_AF_SPI1); //PB3¸´ÓÃΪ SPI1
GPIO_PinAFConfig(GPIOB,GPIO_PinSource4,GPIO_AF_SPI1); //PB4¸´ÓÃΪ SPI1
GPIO_PinAFConfig(GPIOB,GPIO_PinSource5,GPIO_AF_SPI1); //PB5¸´ÓÃΪ SPI1
//ÕâÀïÖ»Õë¶ÔSPI¿Ú³õʼ»¯
RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1,ENABLE);//¸´Î»SPI1
RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1,DISABLE);//Í£Ö¹¸´Î»SPI1
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; //ÉèÖÃSPIµ¥Ïò»òÕßË«ÏòµÄÊý¾Ýģʽ:SPIÉèÖÃΪ˫ÏßË«ÏòÈ«Ë«¹¤
SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //ÉèÖÃSPI¹¤×÷ģʽ:ÉèÖÃΪÖ÷SPI
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; //ÉèÖÃSPIµÄÊý¾Ý´óС:SPI·¢ËͽÓÊÕ8λ֡½á¹¹
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low; //´®ÐÐͬ²½Ê±ÖӵĿÕÏÐ״̬ΪµÍµçƽ
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; //´®ÐÐͬ²½Ê±Öӵĵڶþ¸öÌø±äÑØ£¨ÉÏÉý»òϽµ£©Êý¾Ý±»²ÉÑù
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //NSSÐźÅÓÉÓ²¼þ£¨NSS¹Ü½Å£©»¹ÊÇÈí¼þ£¨Ê¹ÓÃSSI룩¹ÜÀí:ÄÚ²¿NSSÐźÅÓÐSSIλ¿ØÖÆ
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_32; //¶¨Ò岨ÌØÂÊÔ¤·ÖƵµÄÖµ:²¨ÌØÂÊÔ¤·ÖƵֵΪ256
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //Ö¸¶¨Êý¾Ý´«Êä´ÓMSBλ»¹ÊÇLSBλ¿ªÊ¼:Êý¾Ý´«Êä´ÓMSBλ¿ªÊ¼
SPI_InitStructure.SPI_CRCPolynomial = 7; //CRCÖµ¼ÆËãµÄ¶àÏîʽ
SPI_Init(SPI1, &SPI_InitStructure); //¸ù¾ÝSPI_InitStructÖÐÖ¸¶¨µÄ²ÎÊý³õʼ»¯ÍâÉèSPIx¼Ä´æÆ÷
SPI_Cmd(SPI1, ENABLE); //ʹÄÜSPIÍâÉè
}
//³õʼ»¯ADS1256 GPIO
void Init_ADS1256_GPIO(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC -> AHB1ENR |= (1<<1); //PB
GPIO_InitStructure.GPIO_Pin = GPIO_RCC_ADS1256Reset|GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIO_RCC_ADS1256Reset_PORT, &GPIO_InitStructure);
GPIO_ResetBits(GPIO_RCC_ADS1256Reset_PORT, GPIO_RCC_ADS1256Reset );
GPIO_InitStructure.GPIO_Pin = GPIO_ADS1256DRDY;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIO_ADS1256DRDY_PORT, &GPIO_InitStructure);
SPI1_Init();
}
//-----------------------------------------------------------------//
// ¹¦ ÄÜ£º Ä£ÄâSPIͨÐÅ
// Èë¿Ú²ÎÊý: / ·¢Ë͵ÄSPIÊý¾Ý
// ³ö¿Ú²ÎÊý: / ½ÓÊÕµÄSPIÊý¾Ý
// È«¾Ö±äÁ¿: /
// ±¸ ×¢: ·¢ËͽÓÊÕº¯Êý
//-----------------------------------------------------------------//
unsigned char SPI_WriteByte(unsigned char TxData)
{
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET){}//µÈ´ý·¢ËÍÇø¿Õ
SPI_I2S_SendData(SPI1, TxData); //ͨ¹ýÍâÉèSPIx·¢ËÍÒ»¸öbyte Êý¾Ý
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET){} //µÈ´ý½ÓÊÕÍêÒ»¸öbyte
return SPI_I2S_ReceiveData(SPI1); //·µ»Øͨ¹ýSPIx×î½ü½ÓÊÕµÄÊý¾Ý
}
//-----------------------------------------------------------------//
// ¹¦ ÄÜ£ºADS1256 дÊý¾Ý
// Èë¿Ú²ÎÊý: /
// ³ö¿Ú²ÎÊý: /
// È«¾Ö±äÁ¿: /
// ±¸ ×¢: ÏòADS1256ÖеØַΪregaddrµÄ¼Ä´æÆ÷дÈëÒ»¸ö×Ö½Údatabyte
//-----------------------------------------------------------------//
void ADS1256WREG(unsigned char regaddr,unsigned char databyte)
{
GPIO_ResetBits(GPIOB, GPIO_Pin_6);
while(GPIO_ReadInputDataBit(GPIO_ADS1256DRDY_PORT,GPIO_ADS1256DRDY));//µ±ADS1256_DRDYΪµÍʱ²ÅÄÜд¼Ä´æÆ÷
//Ïò¼Ä´æÆ÷дÈëÊý¾ÝµØÖ·
SPI_WriteByte(ADS1256_CMD_WREG | (regaddr & 0x0F));
//дÈëÊý¾ÝµÄ¸öÊýn-1
SPI_WriteByte(0x00);
//ÏòregaddrµØÖ·Ö¸ÏòµÄ¼Ä´æÆ÷дÈëÊý¾Ýdatabyte
SPI_WriteByte(databyte);
delay_us(1);
GPIO_SetBits(GPIOB, GPIO_Pin_6);
}
//³õʼ»¯ADS1256
void ADS1256_Init(void)
{
Init_ADS1256_GPIO();
GPIO_ResetBits(GPIOB, GPIO_Pin_7);
delay_us(50);
GPIO_SetBits(GPIOB, GPIO_Pin_7);//RESET
delay_us(50);
GPIO_ResetBits(GPIOB, GPIO_Pin_6);//CS
ADS1256WREG(ADS1256_STATUS,0x06); // ¸ßλÔÚÇ°¡¢Ð£×¼¡¢Ê¹Óûº³å
while(GPIO_ReadInputDataBit(GPIO_ADS1256DRDY_PORT,GPIO_ADS1256DRDY));
SPI_WriteByte(ADS1256_CMD_SELFCAL);//Æ«ÒÆÔöÒæ×ÔУ׼
// ADS1256WREG(ADS1256_MUX,0x08); // ³õʼ»¯¶Ë¿ÚA0Ϊ¡®+¡¯£¬AINCOMλ¡®-¡¯
// while(GPIO_ReadInputDataBit(GPIO_ADS1256DRDY_PORT,GPIO_ADS1256DRDY));
ADS1256WREG(ADS1256_ADCON,0); // ·Å´ó±¶Êý1
ADS1256WREG(ADS1256_DRATE,ADS1256_DRATE_15000SPS); // Êý¾Ý5sps
ADS1256WREG(ADS1256_IO,0x00);
GPIO_SetBits(GPIOB, GPIO_Pin_6);
}
标签：采样率,SPI1,STM32F407ADS1526,15000SPS,void,SPI,InitStructure,GPIO,RCC 来源： https://www.cnblogs.com/calm-monkey/p/11369858.html