Unable to get ADC INTERRUPT

[pavan2]

Posted on January 29, 2009 at 03:20

Unable to get ADC INTERRUPT

[sofiene]

Posted on May 17, 2011 at 13:01

If you want to get one simple, replace 50 by 1.

I used 50 value to compute the average of 50 simples. M3allem

[jgalea]

Posted on May 17, 2011 at 13:01

Hekllo M3allem, Thanks once again. Please, if you have time can you check that I declared the clock well, because Im thinking that I have a setting not right. This is my code if you have time. Thanks,

void InitClk (void) //pg 262 { RCC_DeInit(); //resets RCC clock configuration to reset state. /* Enable HSE */ //External High Speed oscillator RCC_HSEConfig(RCC_HSE_ON); /* Wait till HSE is ready */ HSEStartUpStatus = RCC_WaitForHSEStartUp(); if(HSEStartUpStatus == SUCCESS) { RCC_HCLKConfig(RCC_SYSCLK_Div1); //AHB clock = SYSCLK //AHB is Advanced High-performance Bus, bus protocol. /*Flash 2 wait state */ FLASH_SetLatency(FLASH_Latency_2); /* Enable Prefetch Buffer */ FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable); //PLLCLK = 8MHz / 2 = 4MHz * 9 = 36 MHz RCC_PLLConfig(RCC_PLLSource_HSE_Div2, RCC_PLLMul_9); //sets buses depending on internal clock limit is 36MHz, RM0008 pg 34 /* PCLK2 = HCLK */ //hspeed bus 36MHz RCC_PCLK2Config(RCC_HCLK_Div1); /* PCLK1 = HCLK *///lspeed bus 36Mhz limit is 36MHz RCC_PCLK1Config(RCC_HCLK_Div1); /*ADCCLK = PCLK2/6 */ RCC_ADCCLKConfig(RCC_PCLK2_Div2); /* Enable PLL */ RCC_PLLCmd(ENABLE); /*Wait till PLL is ready */ while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET) {}; /* Select PLL as system clock source */ RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK); /* Wait till PLL is used as system clock source */ while(RCC_GetSYSCLKSource() != 0x08) {}; } /* Enable DMA clock */ //DMA2 available on high density devices only RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); //RCC_AHBPeriphClockCmd(RCC_AHBPeriph_SRAM, ENABLE); /* ADC1 & 2 Periph clock enable */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); /* TIM1 Periph clock enable */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); /* Enable GPIOA, GPIOB, GPIOC, GPIOD, GPIOE and AFIO clocks */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB , ENABLE); /* Enable USART1 clocks */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); // Enable SPI1 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1,ENABLE); /* TIM2 clock enable */ RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); // Enable SPI2 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,ENABLE); /* ADC1 & 2 Periph clock enable */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); }

[sofiene]

Posted on May 17, 2011 at 13:01

Hi jgalea;

The ADC clock has to not excced 14MHz, so in your code the ADC clock works at 18MHz: /* PCLK2 = HCLK */ //hspeed bus 36MHz RCC_PCLK2Config(RCC_HCLK_Div1); /*ADCCLK = PCLK2/6 = 36/2 = 18MHz*/ RCC_ADCCLKConfig(RCC_PCLK2_Div2); So I think you have to replace RCC_PCLK2_Div2 by RCC_PCLK2_Div4 -> ADC clock = 36/4 = 9Mhz M3allem

[jgalea]

Posted on May 17, 2011 at 13:01

Hello M3allem. Thanks once again. For me it was an important point of the ADC max speed, as I did not know it. However, interrupt still did not occur. I do not wish to take further your time. Please, as a last help can you check that I configured channel A correctly?. Many thanks Johann

//declaration of variable for GPIO setup GPIO_InitTypeDef GPIO_InitStructure; ///////////////PORT A////////////////////////////////////// GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //LEDs (digital) GPIO_InitStructure.GPIO_Pin = (GPIO_Pin_11 | GPIO_Pin_12); //Low Voltage Mode On (digital) GPIO_InitStructure.GPIO_Pin |= GPIO_Pin_8; GPIO_Init(GPIOA, &GPIO_InitStructure); //ANALOGUE Inputs GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; GPIO_InitStructure.GPIO_Pin = (GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7); GPIO_Init(GPIOA, &GPIO_InitStructure);

[sofiene]

Posted on May 17, 2011 at 13:01

your GPIO configuration is correct.

I attach my source code, hope that will be helpful! M3allem

[jgalea]

Posted on May 17, 2011 at 13:01

Hello M3allem, Thanks a lot for your interest and for sending me the code. I will downloaded and go through it. I will notify you about my progress. Many thanks and have a nice day. Thanks Johann

[jgalea]

Posted on May 17, 2011 at 13:01

Good morning M3allem. My problem is about the base address DMA_PeripheralBaseAddr. With ((u32)0x40012444C), was entering DMA2 and not DMA1. Im using the STM32F101x4 processor. DMA1 was being addressed after using (u32)ADC1_BASE as address. I will investigate some more and I will place all my code on the forum once ready. My problem is that it is not pointing to the address of the ADC result. I will keep you updated. Thanks Johann.