mordae/pico-sdr
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Fix overflow and move to a different FB pin

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With wider distance between RX and FB and better filtering (R-C-R) the
noise from the FB is greatly attenuated and we see less spurs.
This commit is contained in:
Jan Hamal Dvořák 2025-08-18 10:01:51 +02:00
parent 1e37f88483
commit 5f264e023d
1 changed files with 2 additions and 2 deletions
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4
src/main.c
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@ -25,7 +25,7 @@
#define CLK_SYS_HZ (320 * MHZ) #define CLK_SYS_HZ (320 * MHZ)
#define RX_PIN 10 #define RX_PIN 10
#define FB_PIN 11 #define FB_PIN 6
#define PSU_PIN 23 #define PSU_PIN 23
#define PIO pio0 #define PIO pio0
@ -56,7 +56,7 @@ static int frequency = INIT_FREQ;
static int sample_rate = INIT_SAMPLE_RATE; static int sample_rate = INIT_SAMPLE_RATE;
#define BASE_GAIN (1 << 15) #define BASE_GAIN (1 << 15)
#define ATTN_BITS 10 #define ATTN_BITS 12
#define DECIMATE 4 #define DECIMATE 4
static int gain = BASE_GAIN / (CLK_SYS_HZ / INIT_SAMPLE_RATE); static int gain = BASE_GAIN / (CLK_SYS_HZ / INIT_SAMPLE_RATE);