From 2b76b7924c84549ff6ee2d5900dfa7740adfed3a Mon Sep 17 00:00:00 2001
From: "jamesimmanuel.magsino@stud.h-da.de" <James Immanuel Magsino>
Date: Wed, 20 Nov 2024 11:13:11 +0100
Subject: [PATCH] More comments
---
src/main.c | 17 +++++++++++------
1 file changed, 11 insertions(+), 6 deletions(-)
diff --git a/src/main.c b/src/main.c
index 67778a8..36b9d76 100644
--- a/src/main.c
+++ b/src/main.c
@@ -3,9 +3,6 @@
#include <stdio.h>
#include <unistd.h>
-unsigned *SDApinctrl = (void *)(IO_BANK0_BASE + IO_BANK0_GPIO0_CTRL_OFFSET);
-unsigned *SCLpinctrl = (void *)(IO_BANK0_BASE + IO_BANK0_GPIO1_CTRL_OFFSET);
-
const uint8_t init[4] = {0x21, 0xa0, 0xe1, 0x81};
const uint8_t zeile[8] = {0x00, 0x02, 0x04, 0x06, 0x08, 0x10, 0x12, 0x14};
const uint8_t fill[17] = {0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
@@ -34,13 +31,20 @@ const uint8_t matrix[9][17] = {
};
int main()
{
-
+ // clock enable: 100000 baud (bit/s)
i2c_init(i2c_default, 100000);
+ // Pin 0 and 1 are given I2C functionality (they're the ones connected to the led matrix)
gpio_set_function(0, GPIO_FUNC_I2C);
gpio_set_function(1, GPIO_FUNC_I2C);
- gpio_pull_up(1);
- gpio_pull_up(0);
+ // refer to page 439 in RP2040, redundant with write_blocking - pins are used as output (write enable) (sort of)
+ // gpio_pull_up(1);
+ // gpio_pull_up(0);
+
+ // 0x70 i2c address for 28 pin (refer to matrix.pdf page 21)
+ // can't be directly written cuz we need pointers
+ // system setup (clock enable), ROW/INT set, dimming, display setup
+ // const uint8_t init[4] = {0x21, 0xa0, 0xe1, 0x81};
i2c_write_blocking(i2c_default, 0x70, &init[0], 1, false);
i2c_write_blocking(i2c_default, 0x70, &init[1], 1, false);
@@ -55,6 +59,7 @@ int main()
{
i2c_write_blocking(i2c_default, 0x70, matrix[i], 17, false);
+ // sleep
for (int j = 0; j < 10000000; j++)
{
volatile int i = 0;
--
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