Hello everyone,
I am new to PSoC and embedded systems in general. I am using a CY8CPROTO-063-BLE PSoC 6 PROTOTYPING KIT. I am trying to generate a s...
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Hello everyone,
I am new to PSoC and embedded systems in general. I am using a CY8CPROTO-063-BLE PSoC 6 PROTOTYPING KIT. I am trying to generate a signal of 45 kHz over 1 second, where it pulses for 10 ms of the entire second and the rest is a flat line. I have been attempting to replicate this small project for a long time, and I am really frustrated (Sorry I am a newbie and don't know nor understand much about PSoC).
This is basically similar to an example provided by the company itself, but they did not include any code with it. I guess the idea here is to use a timer counter (OneSecTImer in the pic) to time the other timer counter (Counter in the pic) to work every second, whereas the PWM (FreqGen in the pic) is what generates a signal for the Counter to capture. I am not sure if I am supposed to use a UART or not, but I included it and have been using printf() function to print the desired outputs to PuTTY program. The clocks of the FreqGen and Counter are at 1 MHz, whereas the clock for the OneSecTimer is at 1 kHz (I am not sure if these values are acceptable).
This picture is the settings for the OneSecTimer (also I am not sure if I am choosing the correct period, but I am aware that the count starts from 0 hence why I used 999u).
These are the settings for the PWM FreqGen. I am sure I had done the period wrong, as I had assumed that the period is supposed to be related to the desired 45 kHz output. And I had read on some other post that the compare should be half of the period (In the code I used one of the PDL commands to rewrite the period and compare).
These are the settings for the Counter, with the count input mode as rising edge. I am not sure if my settings will lead me to me to my desired goal.
This is the code I am using in the CM4, and nothing on CM0 other than the default generated code.
#include "project.h"
#include <stdio.h>
//----NOT SURE IF THESE ARE NECESSARY AND WHAT IS THEIR ROLE EXACTLY----//
#define PWM_FreqGen (PWM_FreqGen_HW)
#define OneSecTimer (OneSecTimer_HW)
#define Counter (Counter_HW)
#define MY_Counter_CNT_NUM (0UL)
#define MY_Counter_CNT_MASK (1UL << MY_Counter_CNT_NUM)
#define MY_TCPWM_FreqGen_NUM (0UL)
//----------------------------------------------------------------------//
void Counter_Int_Handler() //Counter interrupt handler
{
NVIC_ClearPendingIRQ(Counter_Int_cfg.intrSrc);
}
int main(void)
{
__enable_irq(); //Enabling global interrupts
UART_Start();
OneSecTimer_Start();
FreqGen_Start();
Counter_Start();
Cy_SysInt_Init(&Counter_Int_cfg,Counter_Int_Handler); //Calling the interrupt but what for?
NVIC_EnableIRQ(Counter_Int_cfg.intrSrc);
float period = 25;
float compare = period/2;
printf ("\ec"); //Clearing previous PuTTY outputs
printf("Link successful\r\n");
for(;;)
{
Cy_TCPWM_PWM_SetPeriod0(FreqGen_HW,FreqGen_CNT_NUM,period);
Cy_TCPWM_PWM_SetCompare0(FreqGen_HW, FreqGen_CNT_NUM,compare);
//-----------------------------TESTING BLOCK-----------------------------//
float status = Cy_TCPWM_PWM_GetStatus(Counter_HW,Counter_CNT_NUM);
float compare0 = Cy_TCPWM_PWM_GetCompare0(Counter_HW,Counter_CNT_NUM);
float compare1 = Cy_TCPWM_PWM_GetCompare1(Counter_HW,Counter_CNT_NUM);
float period0 = Cy_TCPWM_PWM_GetPeriod0(Counter_HW,Counter_CNT_NUM);
float period1 = Cy_TCPWM_PWM_GetPeriod1(Counter_HW,Counter_CNT_NUM);
float statusmask = Cy_TCPWM_PWM_GetStatus(Counter_HW,Counter_CNT_MASK);
float compare0mask = Cy_TCPWM_PWM_GetCompare0(Counter_HW,Counter_CNT_MASK);
float compare1mask = Cy_TCPWM_PWM_GetCompare1(Counter_HW,Counter_CNT_MASK);
float period0mask = Cy_TCPWM_PWM_GetPeriod0(Counter_HW,Counter_CNT_MASK);
float period1mask = Cy_TCPWM_PWM_GetPeriod1(Counter_HW,Counter_CNT_MASK);
//-----------------------------------------------------------------------//
if(status >= 45000){ //What I actually want this condition to be is to acces this statement when frequency is 45 kHz or greater
printf("First condition loop executed.\r\n");
printf("status: %f",status); printf("\n\r");
printf("compare0: %f",compare0);printf("\n\r");
printf("compare1: %f",compare1); printf("\n\r");
printf("period0: %f",period0); printf("\n\r");
printf("period1: %f",period1); printf("\n\r");
float GeneratedSignal = Cy_GPIO_Read(GeneratedSignal_PORT,GeneratedSignal_NUM);
printf("GeneratedSignal: %f",GeneratedSignal); printf("\n\r");
printf("Using mask:\r\n");
printf("statusmask: %f",statusmask); printf("\n\r");
printf("compare0mask: %f",compare0mask);printf("\n\r");
printf("compare1mask: %f",compare1mask); printf("\n\r");
printf("period0mask: %f",period0mask); printf("\n\r");
printf("period1mask: %f",period1mask); printf("\n\r");
Cy_GPIO_Write(RED_PORT,RED_NUM,!Cy_GPIO_Read(RED_PORT,RED_NUM));
CyDelay(500);
Cy_GPIO_Write(RED_PORT,RED_NUM,!Cy_GPIO_Read(RED_PORT,RED_NUM));
CyDelay(500);
}
else { //Ignore the else statement
//printf("Signal out of desired range!\r\nCurrent Signal value of Status = %f",status); printf(" Hz\r\n");
//printf("Compared to a signal of %f",capture); printf(" Hz\r\n");
printf("First condition loop executed.\r\n");
printf("status: %f",status); printf("\n\r");
printf("compare0: %f",compare0);printf("\n\r");
printf("compare1: %f",compare1); printf("\n\r");
printf("period0: %f",period0); printf("\n\r");
printf("period1: %f",period1); printf("\n\r");
float GeneratedSignal = Cy_GPIO_Read(GeneratedSignal_PORT,GeneratedSignal_NUM);
printf("GeneratedSignal: %f",GeneratedSignal); printf("\n\r");
for (int i = 9; i >= 0; i--){
Cy_GPIO_Write(RED_PORT,RED_NUM,!Cy_GPIO_Read(RED_PORT,RED_NUM));
CyDelay(100);
}
}
printf("Next cycle~\r\n");
CyDelay(1000);
//Cy_TCPWM_PWM_Disable(FreqGen_HW, FreqGen_CNT_NUM); Do I need to disable and enable this?
}
}
I had tried many different readable parameters as an attempt to find the generated signal, but I am left with so many question. Before the questions, here is the picture of the output on PuTTY. Another note, retarget I/O is ticked.
I have no idea what most of these numbers output actually mean as the numbers seem like gibberish right now.
For my questions:
1) Is the logic of the build correct and what are the settings that I need to change.
2)If all the settings are now correct, would the attached code output the actual generated signal by the PWM?
3)How do I modify the code or correct so it pulses the 45 kHz signal over 10 ms out of a whole second.
4)Why does the PWM interrupt cause the loop to execute only once when the interrupt is called in void main in the first place?
5)When I do comment out the interrupt, the entire loop keeps on looping correctly with the LEDs blinking as I had written in the code. On the other hand, when I do include the interrupt, only the printf() functions execute and then it feels like the rest of the loop is frozen and not executing.
6)Do I need to add an ADC in order to actually be able to read and generate a signal or is the logic build provided sufficient?
I know this is very long, and thank you to everyone who will help or just tag a long in the journey of learning PSoC and solving this small project.
Best regards,
Issa Hoballah.
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Aug 26, 2021
Solved
