1 files changed, 106 insertions, 0 deletions
diff --git a/fw/tools/freq_meas_test.c b/fw/tools/freq_meas_test.c
new file mode 100644
index 0000000..e2900ad
--- /dev/null
+++ b/fw/tools/freq_meas_test.c
@@ -0,0 +1,106 @@
+
+#include <stdint.h>
+#include <math.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/fcntl.h>
+
+#include "freq_meas.h"
+
+void print_usage(void);
+
+void print_usage() {
+    fprintf(stderr, "Usage: freq_meas_test [test_data.bin]\n");
+}
+
+int main(int argc, char **argv) {
+    if (argc != 2) {
+        fprintf(stderr, "Error: Invalid arguments.\n");
+        print_usage();
+        return 1;
+    }
+
+    int fd = open(argv[1], O_RDONLY);
+    struct stat st;
+    if (fstat(fd, &st)) {
+        fprintf(stderr, "Error querying test data file size: %s\n", strerror(errno));
+        return 2;
+    }
+
+    if (st.st_size < 0 || st.st_size > 1000000) {
+        fprintf(stderr, "Error reading test data: too much test data (size=%zd)\n", st.st_size);
+        return 2;
+    }
+
+    if (st.st_size % sizeof(float) != 0) {
+        fprintf(stderr, "Error reading test data: file size is not divisible by %zd (size=%zd)\n", sizeof(float), st.st_size);
+        return 2;
+    }
+
+    char *buf = malloc(st.st_size);
+    if (!buf) {
+        fprintf(stderr, "Error allocating memory");
+        return 2;
+    }
+
+    fprintf(stderr, "Reading %zd samples test data...", st.st_size/sizeof(float));
+    ssize_t nread = 0;
+    while (nread < st.st_size) {
+        ssize_t rc = read(fd, buf + nread, st.st_size - nread);
+
+        if (rc == -EINTR || rc == -EAGAIN)
+            continue;
+
+        if (rc < 0) {
+            fprintf(stderr, "\nError reading test data: %s\n", strerror(errno));
+            return 2;
+        }
+        
+        if (rc == 0) {
+            fprintf(stderr, "\nError reading test data: Unexpected end of file\n");
+            return 2;
+        }
+
+        nread += rc;
+    }
+    fprintf(stderr, " done.\n");
+
+    const size_t n_samples = st.st_size / sizeof(float);
+    float *buf_f = (float *)buf;
+
+    int16_t *sim_adc_buf = calloc(sizeof(int16_t), n_samples);
+    if (!sim_adc_buf) {
+        fprintf(stderr, "Error allocating memory\n");
+        return 2;
+    }
+
+    fprintf(stderr, "Converting and truncating test data...");
+    for (size_t i=0; i<n_samples; i++)
+        /* Note on scaling: We can't simply scale by 0x8000 (1/2 full range) here. Our test data is nominally 1Vp-p but
+         * certain tests such as the interharmonics one can have some samples exceeding that range. */
+        sim_adc_buf[i] = buf_f[i] * (0x4000-1);
+    fprintf(stderr, " done.\n");
+
+    fprintf(stderr, "Starting simulation.\n");
+
+    size_t iterations = (n_samples-FMEAS_FFT_LEN)/(FMEAS_FFT_LEN/2);
+    for (size_t i=0; i<iterations; i++) {
+
+        fprintf(stderr, "Iteration %zd/%zd\n", i, iterations);
+        float res = NAN;
+        int rc = adc_buf_measure_freq(sim_adc_buf + i*(FMEAS_FFT_LEN/2), &res);
+        if (rc)
+            printf("ERROR: Simulation error in iteration %zd at position %zd: %d\n", i, i*(FMEAS_FFT_LEN/2), rc);
+
+        printf("%09zd %12f\n", i, res);
+    }
+    
+    free(buf);
+    free(sim_adc_buf);
+    return 0;
+}