From bb0fdeff66afd22b9fb3a41c8df7ed224ab38613 Mon Sep 17 00:00:00 2001
From: "matthias@rpi" <matthiasqui@protonmail.com>
Date: Mon, 30 Oct 2023 22:23:12 +0100
Subject: [PATCH] initial commit

---
 .gitignore       |  1 +
 .vimspector.json | 22 ++++++++++++++++++++
 Makefile         | 19 +++++++++++++++++
 spi.cpp          | 54 ++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 96 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 .vimspector.json
 create mode 100644 Makefile
 create mode 100644 spi.cpp

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c928c4b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+spi
diff --git a/.vimspector.json b/.vimspector.json
new file mode 100644
index 0000000..509c996
--- /dev/null
+++ b/.vimspector.json
@@ -0,0 +1,22 @@
+{
+  "configurations": {
+    "spi": {
+      "adapter": "vscode-cpptools",
+      "configuration": {
+        "name": "spi (cpp)",
+        "type": "cppdbg",
+        "request": "launch",
+        "externalConsole": true,
+        "logging": {
+          "engineLogging": true
+        },
+        "stopOnEntry": true,
+        "stopAtEntry": true,
+        "debugOptions": [],
+        "MIMode": "gdb",
+        "cwd": "~/6502/spi/",
+        "program": "./spi"
+      }
+    }
+  }
+}
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..5e84830
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,19 @@
+CFLAGS  	= -g -std=c++20 -O2 -DBCM2835_HAVE_LIBCAP
+LFLAGS  	= -lbcm2835
+
+TARGET		= spi
+
+default: $(TARGET)
+
+.PHONY = clean
+
+%: %.cpp
+	g++ $< -o $@ $(CFLAGS) $(LFLAGS) 
+
+run: default
+	sudo ./$(TARGET)
+
+
+
+clean:
+	rm $(TARGET)
diff --git a/spi.cpp b/spi.cpp
new file mode 100644
index 0000000..255740e
--- /dev/null
+++ b/spi.cpp
@@ -0,0 +1,54 @@
+#include <bcm2835.h>
+#include <iostream>
+#include <string>
+#include <thread>
+#include <vector>
+
+#define BCM2835
+
+
+int main(int argc, const char** argv) {
+    if (bcm2835_init() != 1) {
+        printf("Error: Could not initalise gpio libraray\n");
+        return 1;
+    }
+
+    if (bcm2835_spi_begin() != 1) {
+        printf("Error: Could not begin SPI mode. You might need this: https://www.airspayce.com/mikem/bcm2835/ \"Running as root\"\n");
+        return 1;
+    }
+
+    /* if (argc != 2) { */
+    /*     printf("Error: Expected exactly one argument (filename), got %d\n", argc); */
+    /*     return 1; */
+    /* } */
+
+    bcm2835_spi_chipSelect(BCM2835_SPI_CS0);
+    /* bcm2835_spi_set_speed_hz(5); */
+    bcm2835_spi_setClockDivider(BCM2835_SPI_CLOCK_DIVIDER_65536);
+    bcm2835_spi_setDataMode(BCM2835_SPI_MODE0);
+    std::this_thread::sleep_for(std::chrono::milliseconds(500));
+
+    std::string send = "Hello 6502!";
+    /* char send[] = "Hello 6502!"; */
+    std::vector<char> buffer;
+    buffer.reserve(send.size());
+    for (char c : send) {
+        std::cout << c << std::endl;
+        buffer.push_back(c);
+    }
+    /* for (char i = 0; i < 8; i++) { */
+    /*     buffer.push_back(i); */
+    /* } */
+    /* buffer.push_back(0b10110101); */
+    bcm2835_spi_transfern(buffer.data(), buffer.size());
+
+    /* std::jthread eepromT(simulateEEPROM, bytes); */
+    /* std::atomic<CurrentState> cs; */
+    /* std::jthread clockT(printBusWithClock, PHI2, std::ref(cs)); */
+    /* /1* auto handler = std::bind(signalHandler, std::placeholders::_1, std::move(eepromT)); *1/ */
+    /* signal(SIGINT, signalHandler); */
+
+
+    bcm2835_spi_end();
+}