From: George Wright <gw@gwright.org.uk>
Date: Sat, 7 Dec 2024 19:47:06 +0000 (-0800)
Subject: quick hack to get the prom read to work for now. will need cleaning up
X-Git-Url: http://git.gwright.org.uk/?a=commitdiff_plain;h=c4eb839a9a2ec7c887d54959417aecf4fb247867;p=WindEmu.git

quick hack to get the prom read to work for now. will need cleaning up
---

diff --git a/WindCore/sa1100/asic14.cpp b/WindCore/sa1100/asic14.cpp
index 75ee9e3..f6bf18e 100644
--- a/WindCore/sa1100/asic14.cpp
+++ b/WindCore/sa1100/asic14.cpp
@@ -4,6 +4,40 @@ namespace SA1100 {
 
   ASIC14::ASIC14() {
     init_register();
+    mCurrPlace = 0;
+    for (int i = 0; i < 0x80; i++)
+      prom[i] = 0;
+
+    // defaults expected by the touchscreen code
+    prom[0xA] = 20;
+    prom[0xB] = 20;
+    prom[0xC] = 20;
+    prom[0xD] = 30;
+
+    // some basic stuff to begin with
+    // set up the Psion's unique ID
+    prom[0x1B] = 0xDE;
+    prom[0x1A] = 0xAD;
+    prom[0x19] = 0xBE;
+    prom[0x18] = 0xEF;
+
+    // give ourselves a neat custom device name
+    const char *key = "PSIONPSIONPSION";
+    const char *name = "WindEmu!";
+    prom[0x28] = strlen(name);
+    if (prom[0x28] > 15)
+        prom[0x28] = 15;
+    for (int i = 0; i < prom[0x28]; i++)
+        prom[0x29 + i] = name[i] ^ key[i];
+
+    // calculate the checksum
+    uint8_t chk = 0;
+    for (int i = 0; i < 0x7F; i++)
+        chk ^= prom[i];
+
+    // EPOC is expecting 66
+	  prom[0x7F] = chk ^ 66;
+
   }
   
   void ASIC14::reset() {
@@ -22,11 +56,12 @@ namespace SA1100 {
     m_IRQ_EDGE = 0;
     m_SPI_DATA = 0;
     m_SPI_FN = 0;
+    m_STATUS6 = (1 << 1) | (1 << 10) | (1 << 11);
   }
   
   void ASIC14::run() {}
   
-  uint16_t ASIC14::get_data(uint32_t const address) const {
+  uint16_t ASIC14::get_data(uint32_t const address) {
       switch (address) {
           case CTRL0:
             printf("ASIC14 read register CTRL0: %04x\n", m_CTRL0);
@@ -64,12 +99,15 @@ namespace SA1100 {
           case IRQ_EDGE:
             printf("ASIC14 read register IRQ_EDGE: %04x\n", m_IRQ_EDGE);
             return m_IRQ_EDGE;
-          case STATUS6:
+          case STATUS6: {
             printf("ASIC14 read register STATUS6: %04x\n", m_STATUS6);
-            return m_STATUS6 | 2;
+            auto status = m_STATUS6;
+            m_STATUS6 = 0;
+            return status;
+          }
           case SPI_DATA:
-            printf("ASIC14 read register SPI_DATA: %04x\n", m_SPI_DATA);
-            return m_SPI_DATA;
+            printf("ASIC14 read register SPI_DATA: %04x\n", prom[mCurrPlace] | prom[mCurrPlace+1] << 8);
+            return prom[mCurrPlace++] | prom[mCurrPlace++] << 8;
           case SPI_FN:
             printf("ASIC14 read register SPI_FN: %04x\n", m_SPI_FN);
             return m_SPI_FN;
@@ -111,7 +149,7 @@ namespace SA1100 {
             break;
           case IRQ_STATUS:
             printf("ASIC14 write %04x to register IRQ_STATUS\n", value);
-            m_IRQ_STATUS = value;
+            m_IRQ_STATUS &= ~value;
             break;
           case IRQ_MASK:
             printf("ASIC14 write %04x to register IRQ_MASK\n", value);
@@ -131,8 +169,7 @@ namespace SA1100 {
             break;
           case STATUS6:
             printf("ASIC14 write %04x to register STATUS6\n", value);
-            // Clear interrupts on STATUS6 according to the bit mask provided
-            m_STATUS6 &= ~value;
+            //m_STATUS6 = value;
             break;
           case SPI_DATA:
             printf("ASIC14 write %04x to register SPI_DATA\n", value);
@@ -140,6 +177,8 @@ namespace SA1100 {
             break;
           case SPI_FN:
             printf("ASIC14 write %04x to register SPI_FN\n", value);
+            if (value == 4 || value == 6)
+              m_STATUS6 = 2;
             m_SPI_FN = value;
             break;
           default:
diff --git a/WindCore/sa1100/asic14.h b/WindCore/sa1100/asic14.h
index 98d7633..7397e9d 100644
--- a/WindCore/sa1100/asic14.h
+++ b/WindCore/sa1100/asic14.h
@@ -40,6 +40,8 @@ class ASIC14 {
     typedef enum IRQMaskEnum IRQMaskEnum;
 
   private:
+    uint8_t prom[0x80] = {};
+    int mCurrPlace = 0;
     enum
     {
         CTRL0       = 0x10000000,
@@ -93,6 +95,7 @@ class ASIC14 {
         m_IRQ_EDGE = 0;
         m_SPI_DATA = 0;
         m_SPI_FN = 0;
+        m_STATUS6 = ~0;//(1 << 2) | (1 << 10) | (1 << 11);
     }
 
   public:
@@ -101,7 +104,7 @@ class ASIC14 {
     void run();
     void reset();
 
-    uint16_t get_data(uint32_t const address) const;
+    uint16_t get_data(uint32_t const address);
 
     void put_data(uint32_t const address, uint16_t const value);
 };