/*

• AD-Wandlung für beide Potis mit DMA und Verwendung des libopencm3 Beispiels
• Potis: PortA Pin 6,Pin7
• ADC1
• DMA2, Stream0, channel 0, da DMA2 auf channel0 stream0 den ADC1 belauscht.
• This file is part of the libopencm3 project.
  @author: Adriana
  */

include <libopencm3/stm32/rcc.h>

include <libopencm3/stm32/gpio.h>

include <libopencm3/stm32/adc.h>

include <libopencm3/stm32/dma.h>

include <stdint.h>

include <stdio.h>

include <unistd.h>

include "adc-potis.h"

include "clock.h"

include "console.h"

include "sdram.h"

include "lcd-spi.h"

include "gfx.h"

define ARRAY_PLACES 2

uint8_t potis_vals[ARRAY_PLACES];

static void rcc_setup(void){

/* ADC1  */
rcc_periph_clock_enable(RCC_ADC1); 

/*ADC1 on APB2*/
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_ADC1EN);

/* Potis*/
rcc_periph_clock_enable(RCC_GPIOA);  

/*Clock for DMA2*/
rcc_peripheral_enable_clock(&RCC_AHB1ENR,RCC_AHB1ENR_DMA2EN);

}

void dma_setup(void);
void dma_setup(void){

//dma_stream_reset(DMA2,DMA_STREAM0);  /*The specified stream is disabled and configuration registers are cleared.*/
dma_disable_stream(DMA2, DMA_STREAM0);
dma_channel_select(DMA2,DMA_STREAM0,DMA_SxCR_CHSEL_0); /*DMA2, Stream0,Channel0, for ADC1 .*/
dma_set_number_of_data(DMA2,DMA_STREAM0,ARRAY_PLACES);    
dma_set_transfer_mode(DMA2,DMA_STREAM0,DMA_SxCR_DIR_PERIPHERAL_TO_MEM);  
dma_set_peripheral_address(DMA2,DMA_STREAM0,(uint32_t) &ADC_DR(ADC1)); 
dma_set_memory_address(DMA2, DMA_STREAM0, (uint32_t) potis_vals); 
dma_disable_peripheral_increment_mode(DMA2,DMA_STREAM0); 
dma_enable_memory_increment_mode(DMA2,DMA_STREAM0);    
dma_set_peripheral_size(DMA2,DMA_STREAM0,DMA_SxCR_PSIZE_16BIT);
dma_set_memory_size(DMA2,DMA_STREAM0,DMA_SxCR_MSIZE_16BIT);        
dma_enable_circular_mode(DMA2,DMA_STREAM0); 
dma_set_priority(DMA2,DMA_STREAM0,DMA_SxCR_PL_HIGH);
dma_enable_direct_mode(DMA2,DMA_STREAM0); /*No FIFO*/
dma_set_peripheral_flow_control(DMA2,DMA_STREAM0);                             
dma_enable_stream(DMA2,DMA_STREAM0); 

}

static void adc_setup(void)
{

/*Pins for Potis*/
gpio_mode_setup(GPIOA, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, GPIO6);
gpio_mode_setup(GPIOA, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, GPIO7);

/*ADC*/
gpio_mode_setup(GPIOA, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, GPIO0);
gpio_mode_setup(GPIOA, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, GPIO1);

adc_power_off(ADC1);  


adc_set_clk_prescale(ADC_CCR_ADCPRE_BY4);
adc_set_resolution(ADC1,ADC_CR1_RES_12BIT);
adc_set_right_aligned(ADC1);    
adc_set_continuous_conversion_mode(ADC1); 
adc_disable_external_trigger_regular(ADC1);
adc_enable_scan_mode(ADC1); /* 2 channels*/
adc_set_sample_time_on_all_channels(ADC1,ADC_SMPR_SMP_84CYC);

/*allow DMA to continue to operate after the last conversion in the DMA sequence. 
This allows DMA to be used in continuous circular mode.*/
adc_set_dma_continue(ADC1);

adc_enable_dma(ADC1);

/*ADC1-channels for the 2 potentiometer*/
uint8_t channel_array[2];
channel_array[0]=ADC_CHANNEL6;
channel_array[1]=ADC_CHANNEL7;
adc_set_regular_sequence(ADC1, 2, channel_array);

adc_power_on(ADC1);

  /* Wait for ADC starting up. */
int i;
for (i = 0; i < 800000; i++)
    __asm__("nop");

adc_start_conversion_regular(ADC1);

}

int main(void)
{

char  val1[32],val2[32]; /*put voltage-values of the potis in val1 and val2 */
float poti_proportion1, poti_proportion2;
int i;

rcc_setup();
dma_setup();
adc_setup();
clock_setup();
console_setup(115200); 
sdram_init();            
lcd_spi_init(); 
gfx_init(lcd_draw_pixel, 240, 320);


while (1) {


    for (i = 0; i < 1000000; i++) { /* Wait a bit. */
        __asm__("NOP");
    }


    poti_proportion1 = potis_vals[0] / POTIS_ADC_MAX_VALUE; 
    poti_proportion2 = potis_vals[1] / POTIS_ADC_MAX_VALUE;
    sprintf(val1, "%.2f V", 3.3 * poti_pro