STM32F3 ADC

[Jaroslav Buchta]

Tak super, uz to funguje jak vino.
Jen jedna divna vec, zpracovavam tam rychle ADC data a myslel jsem si, 
ze kdyz vse, krome DMA bufferu presunu do CCM RAM, tak by se to mohlo 
trosku zrychlit protoze se pristupy do RAM nebudou prat s DMA - opak je 
pravdou, operace trva o chlup dele. Kod v disassembleru vypada tak nejak 
stejne, nejake vysvetleni?
Testovaci program ISR je pro test zatim takto a ISR trva v prumeru 2.5us 
pro RAM a 2.7us pro CCM. V RAM ma cas trosku vetsi rozptyl. Nejake 
vysvetleni? Myslel jsem, ze CCM je pro procesor nejlepe pristupna, dela 
to nejaka zapisova cache?

//static volatile uint16_t outputCurr[14] 
__attribute__((section(".ccmram")));
//static uint16_t limitCurr[14] __attribute__((section(".ccmram")));
//static uint8_t  overCurr[14] __attribute__((section(".ccmram")));

static volatile uint16_t outputCurr[14];
static uint16_t limitCurr[14];
static uint8_t  overCurr[14];

...........

#define ADCPROCCURR(sofs, dofs, port, pin)    v = pbuf[sofs]; \
                                             if (v > limitCurr[dofs]) 
{LL_GPIO_ResetOutputPin(port, pin); overCurr[dofs] = 1; }    \
                                             outputCurr[dofs] = v


void adcsvc_IsrDma (int phase)
{
     uint16_t *pbuf = phase ? (uint16_t *) 
&adc1_dma_buffer[ADC_CHANNELS] : (uint16_t *) &adc1_dma_buffer[0];
     register uint16_t v;

     ADCPROCCURR(1, 0,  DIAG2_GPIO_Port, DIAG2_Pin);
     ADCPROCCURR(5, 1,  DIAG2_GPIO_Port, DIAG2_Pin);
     ADCPROCCURR(4, 2,  DIAG2_GPIO_Port, DIAG2_Pin);
     ADCPROCCURR(3, 3,  DIAG2_GPIO_Port, DIAG2_Pin);
     ADCPROCCURR(2, 4,  DIAG2_GPIO_Port, DIAG2_Pin);
     ADCPROCCURR(7, 5,  DIAG2_GPIO_Port, DIAG2_Pin);
     ADCPROCCURR(9, 6,  DIAG2_GPIO_Port, DIAG2_Pin);
     ADCPROCCURR(8, 7,  DIAG2_GPIO_Port, DIAG2_Pin);
     ADCPROCCURR(7, 8,  DIAG2_GPIO_Port, DIAG2_Pin);
     ADCPROCCURR(6, 9,  DIAG2_GPIO_Port, DIAG2_Pin);
     ADCPROCCURR(2, 10, DIAG2_GPIO_Port, DIAG2_Pin);
     ADCPROCCURR(9, 11, DIAG2_GPIO_Port, DIAG2_Pin);
     ADCPROCCURR(8, 12, DIAG2_GPIO_Port, DIAG2_Pin);
     ADCPROCCURR(7, 13, DIAG2_GPIO_Port, DIAG2_Pin);
}