Hi,
We were wondering if we can have multiplexed input for ADC_DelSig.
Reading the datasheet of ADC_DelSig, it seemed to be possible.
So I tried one with CY8CKIT-059.
schematic
To test the behavior, I also added a couple of WaveDAC8s
One generates a sine wave, and the other generates a square wave.
And AMuxHw is controlled from Control_Reg.
To test, please connect following pins with jumper wires
P3[0] and P1[7]
P3[1] and P1[6]
The result viewed via SerialPlot was
So, yes, it is working.
Pins
main.c
Note: As usual, I cheated by using my tty_utils library,
But you could replace
tty_init() with UART_Start()
print() with UART_PutString()
if you don't want to use that library.
(You may need to comment out splash() though)
====================
#include "project.h"
#include "stdio.h"
#include "tty_utils.h"
#define DATA_NUM 1024
uint16_t data[2][DATA_NUM] ;
volatile int pit_flag = 0 ;
volatile int ch = 0 ;
volatile int data_index = 0 ;
volatile int data_full = 0 ;
CY_ISR(pit_isr)
{
pit_flag = 1 ;
Counter_ReadStatusRegister() ;
Control_Reg_Write(ch) ;
ADC_BUSY_Write(1) ;
ADC_StartConvert() ;
ADC_IsEndConversion(0) ;
ADC_BUSY_Write(0) ;
data[ch][data_index] = ADC_GetResult32() ;
ch++ ;
if (ch > 1) {
data_index++ ;
ch = 0 ;
if (data_index >= DATA_NUM) {
Counter_Stop() ;
data_full = 1 ;
data_index = 0 ;
}
}
}
void init_hardware(void)
{
CyGlobalIntEnable; /* Enable global interrupts. */
tty_init() ;
ADC_Start() ;
WaveDAC8_1_Start() ;
WaveDAC8_2_Start() ;
pit_int_ClearPending() ;
pit_int_StartEx(pit_isr) ;
}
int32_t measure(int ch)
{
int32_t value ;
Control_Reg_Write(ch) ;
ADC_BUSY_Write(1) ;
ADC_StartConvert() ;
ADC_IsEndConversion(0) ;
ADC_BUSY_Write(0) ;
value = ADC_GetResult32() ;
if (value < 0) {
value = 0 ;
}
return(value) ;
}
int main(void)
{
int i ;
init_hardware() ;
splash("DelSig ADC 2ch mux test") ;
Counter_Start() ;
for(;;) {
if (data_full) {
data_full = 0 ;
for (i = 0 ; i < DATA_NUM ; i++ ) {
snprintf(str, STR_BUF_LEN, "%d %d\n\r", data[0], data[1]) ;
print(str) ;
CyDelay(1) ;
}
Counter_Start() ;
}
}
}
====================
moto
