From b0218782adc8e05c89d51aaceb674fbf45bd4626 Mon Sep 17 00:00:00 2001
From: James Talbert <jtalbert@iastate.edu>
Date: Thu, 27 Sep 2018 11:44:05 -0500
Subject: [PATCH] Add frequency scanning to PWM loop tests
---
.../Loopback_Error_Check/src/helloworld.c | 55 +++++++++++--------
1 file changed, 33 insertions(+), 22 deletions(-)
diff --git a/quad/vivado_workspace/PWM_Combined_Tests/PWM_Combined_Tests.sdk/Loopback_Error_Check/src/helloworld.c b/quad/vivado_workspace/PWM_Combined_Tests/PWM_Combined_Tests.sdk/Loopback_Error_Check/src/helloworld.c
index 2d20f1a91..ea39a04e3 100644
--- a/quad/vivado_workspace/PWM_Combined_Tests/PWM_Combined_Tests.sdk/Loopback_Error_Check/src/helloworld.c
+++ b/quad/vivado_workspace/PWM_Combined_Tests/PWM_Combined_Tests.sdk/Loopback_Error_Check/src/helloworld.c
@@ -51,6 +51,7 @@
#include "xparameters.h"
#include "xuartps.h"
#include "sleep.h"
+#include "math.h"
int main() {
init_platform();
@@ -61,33 +62,43 @@ int main() {
(volatile uint32_t*) (XPAR_PWM_RECORDER_0_S_AXI_BASEADDR);
volatile uint32_t* pwmGenerate =
(volatile uint32_t*) (XPAR_PWM_SIGNAL_OUT_0_S_AXI_BASEADDR);
+ while (1) {
+ print(
+ "Please connect JB0 and JB1 with an external jumper.\r\nWhen ready, press any button.\n\r");
+ while (buttonsGPIO[0] == 0)
+ ;
+ print("Thank You :)\r\n");
- print(
- "Please connect JB0 and JB1 with an external jumper.\r\nWhen ready, press any button.\n\r");
- while (buttonsGPIO[0] == 0)
- ;
- print("Thank You :)\r\n");
+ const int min_period = 1000;
+ const int max_period = 5 * 1000 * 1000;
+ const float period_step_factor = 1.5;
+ int period;
+ for (period = min_period; period < max_period; period *=
+ period_step_factor) {
- pwmGenerate[0] = 50 * 1000;
- pwmGenerate[1] = 25 * 1000;
+ pwmGenerate[1] = period / 2;
+ pwmGenerate[0] = period;
- int iteration;
- const int num_iterations = 100;
- for (iteration = 0; iteration < num_iterations; iteration++) {
- pwmGenerate[1] = (iteration * pwmGenerate[0]) / num_iterations;
- usleep(10000);
+ int duty_iteration;
+ const int num_duty_iterations = 100;
+ for (duty_iteration = 0; duty_iteration < num_duty_iterations;
+ duty_iteration++) {
+ pwmGenerate[1] = ((duty_iteration + 1) * pwmGenerate[0])
+ / (num_duty_iterations + 1);
- int error = pwmRecord[0] - pwmGenerate[1];
- int abserror = error;
- if (abserror < 0) {
- abserror = -error;
+ usleep(period / 25);
+
+ int error = pwmRecord[0] - pwmGenerate[1];
+ int abserror = (error < 0) ? -error : error;
+ if (abserror > pwmGenerate[0] / 1000) {
+ xil_printf("%5d Hz, %3d%% Duty Cycle: %d cycle error\r\n",
+ (50 * 1000 * 1000 / pwmGenerate[0]),
+ (100 * pwmGenerate[1]) / pwmGenerate[0], error);
+ }
+
+ }
+ usleep(period / 5);
}
- xil_printf("%3d%% Duty Cycle: %c%3d.%08d%% error\r\n",
- (100 * pwmGenerate[1]) / pwmGenerate[0],
- (error < 0) ? '-' : ' ',
- (100 * abserror) / ((int) pwmGenerate[0]),
- ((10000000000 * abserror) / ((int) pwmGenerate[0]))
- % 100000000);
}
cleanup_platform();
return 0;
--
GitLab