I disagree that
I agree to disagree!, its pretty head busting stuff
I have managed some success, I actually feel like I am getting somewhere, it was pretty straightforward getting one ADC to work but I have struggled getting two to work separately its all this channel stuff that confuses me.
I have a program that uses an interrupt to blink the orange LED and measures the input on Port C pin 0 (Channel 10)
#include "stm32f4_discovery.h"
#include <stdio.h>
#include <math.h>
#include "stm32f4xx.h"
void INTTIM_Config(void);
void IO_Config(void);
void ADC1_CH10_Config(void);
void TIM2_IRQHandler(void)//interrupt toggles orange LED = PD13
{
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
{
GPIO_ToggleBits(GPIOD, GPIO_Pin_13);
TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
}
}
int main(void){
int *ADC1_DATA =0x4001204c;//ADC1 Data register (pointer to!)
INTTIM_Config();
IO_Config();
GPIO_SetBits(GPIOD, GPIO_Pin_15|GPIO_Pin_14|GPIO_Pin_12);//Set 3 LED's HIGH
ADC1_CH10_Config();
/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE);
/* Start ADC1 Software Conversion */
ADC_SoftwareStartConv(ADC1);
while (1)
{
ADC_SoftwareStartConv(ADC1);
float VIN = *ADC1_DATA*0.720214843 +16.0;
float IIN = (VIN-2500.0)*0.745614035;
}
}
void INTTIM_Config(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* TIM2 clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
/* Time base configuration */
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Period = 500000; // period 500000 = 0.5 seconds
TIM_TimeBaseStructure.TIM_Prescaler = 80; // Prescale 80 = 1us per click
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
/* TIM IT enable */
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
/* TIM2 enable counter */
TIM_Cmd(TIM2, ENABLE);
}
void IO_Config(void)
{
/* GPIOD enable as output for LED's */
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13| GPIO_Pin_14| GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOD, &GPIO_InitStructure);
/* GPIOC enable as analog input */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1 ;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}
/* ENABLE ADC1 (channel 10=PC0) */
void ADC1_CH10_Config(void)
{RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
ADC_CommonInitTypeDef ADC_CommonInitStructure;
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(&ADC_CommonInitStructure);
ADC_InitTypeDef ADC_InitStructure;
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_ExternalTrigConv=ADC_ExternalTrigConv_T1_CC1;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 1;
ADC_Init(ADC1, &ADC_InitStructure);
/* ADC1 regular channels 10 configuration */
ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 1, ADC_SampleTime_56Cycles);
}