From 5b6af5e56019eec701f81450b79ca413fbae6032 Mon Sep 17 00:00:00 2001
From: Karl Kurbjun <kkurbjun@gmail.com>
Date: Tue, 14 Apr 2009 05:17:03 +0000
Subject: M:Robe 500 Fix a bug in the UART receive buffer - remote does not
 appear to stop working anymore, add support for interupt driven transmit, add
 very rough remote LCD support.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20706 a1c6a512-1295-4272-9138-f99709370657
---
 .../arm/tms320dm320/mrobe-500/button-mr500.c       |  40 ++--
 .../arm/tms320dm320/mrobe-500/lcd-remote-mr500.c   | 204 ++++++++++-----------
 firmware/target/arm/tms320dm320/uart-dm320.c       | 121 ++++++++----
 firmware/target/arm/tms320dm320/uart-target.h      |   6 +-
 4 files changed, 207 insertions(+), 164 deletions(-)

diff --git a/firmware/target/arm/tms320dm320/mrobe-500/button-mr500.c b/firmware/target/arm/tms320dm320/mrobe-500/button-mr500.c
index bc163b1070..00096ce2ad 100644
--- a/firmware/target/arm/tms320dm320/mrobe-500/button-mr500.c
+++ b/firmware/target/arm/tms320dm320/mrobe-500/button-mr500.c
@@ -186,27 +186,26 @@ int button_read_device(int *data)
     }
 
     retval=uart1_gets_queue(r_buffer, 5);
-    do
+    
+    for(calbuf=0;calbuf<4;calbuf++)
     {
-        for(calbuf=0;calbuf<4;calbuf++)
-        {
-            if((r_buffer[calbuf]&0xF0)==0xF0 && (r_buffer[calbuf+1]&0xF0)!=0xF0)
-                break;
-        }
-        calbuf++;
-        if(calbuf==5)
-            calbuf=0;
-        if(retval>=0)
-        {
-            r_button |= r_buffer[calbuf];
-            oldbutton=r_button;
-        }
-        else
-        {
-            r_button=oldbutton;
-        }
-    } while((retval=uart1_gets_queue(r_buffer, 5))>=5);
-
+        if((r_buffer[calbuf]&0xF0)==0xF0 && (r_buffer[calbuf+1]&0xF0)!=0xF0)
+            break;
+    }
+    calbuf++;
+    if(calbuf==5)
+        calbuf=0;
+    if(retval>=0)
+    {
+        uart1_clear_queue();
+        r_button |= r_buffer[calbuf];
+        oldbutton=r_button;
+    }
+    else
+    {
+        r_button=oldbutton;
+    }
+    
     return r_button;
 }
 
@@ -226,6 +225,5 @@ void GIO14(void)
             read_battery_inputs();
             break;
     }
-    //touch_available = true;
     IO_INTC_IRQ2 = (1<<3); /* IRQ_GIO14 == 35 */
 }
diff --git a/firmware/target/arm/tms320dm320/mrobe-500/lcd-remote-mr500.c b/firmware/target/arm/tms320dm320/mrobe-500/lcd-remote-mr500.c
index 5cdc00ce6a..0a41b2241f 100644
--- a/firmware/target/arm/tms320dm320/mrobe-500/lcd-remote-mr500.c
+++ b/firmware/target/arm/tms320dm320/mrobe-500/lcd-remote-mr500.c
@@ -33,17 +33,22 @@ static enum remote_control_states
     REMOTE_CONTROL_NOP,
     REMOTE_CONTROL_POWER,
     REMOTE_CONTROL_MASK,
-    REMOTE_CONTROL_DRAW1,
-    REMOTE_CONTROL_DRAW_PAUSE1,
-    REMOTE_CONTROL_DRAW2,
-    REMOTE_CONTROL_DRAW_PAUSE2,
+    REMOTE_CONTROL_DRAW,
     REMOTE_CONTROL_SLEEP
-} remote_state_control = REMOTE_CONTROL_NOP;
+} remote_state_control = REMOTE_CONTROL_NOP, remote_state_control_next;
+
+static enum remote_draw_states
+{
+    DRAW_TOP,
+    DRAW_BOTTOM,
+    DRAW_PAUSE,
+} remote_state_draw = DRAW_TOP, remote_state_draw_next;
 
 bool remote_initialized=true;
 
 unsigned char remote_contrast=DEFAULT_REMOTE_CONTRAST_SETTING;
 unsigned char remote_power=0x00;
+unsigned char remote_mask=0x00;
 
 /*** hardware configuration ***/
 
@@ -54,7 +59,7 @@ int lcd_remote_default_contrast(void)
 
 void lcd_remote_sleep(void)
 {
-    remote_state_control=REMOTE_CONTROL_SLEEP;
+    remote_state_control_next=REMOTE_CONTROL_SLEEP;
 }
 
 void lcd_remote_powersave(bool on)
@@ -62,19 +67,19 @@ void lcd_remote_powersave(bool on)
     if(on)
     {
         remote_power|=0xC0;
-        remote_state_control=REMOTE_CONTROL_POWER;
+        remote_state_control_next=REMOTE_CONTROL_POWER;
     }
     else
     {
         remote_power&=~(0xC0);
-        remote_state_control=REMOTE_CONTROL_POWER;
+        remote_state_control_next=REMOTE_CONTROL_POWER;
     }
 }
 
 void lcd_remote_set_contrast(int val)
 {
     remote_contrast=(char)val;
-    remote_state_control=REMOTE_CONTROL_POWER;
+    remote_state_control_next=REMOTE_CONTROL_POWER;
 }
 
 void lcd_remote_set_invert_display(bool yesno)
@@ -82,12 +87,6 @@ void lcd_remote_set_invert_display(bool yesno)
     (void)yesno;
 }
 
-/* turn the display upside down (call lcd_remote_update() afterwards) */
-void lcd_remote_set_flip(bool yesno)
-{
-    (void)yesno;
-}
-
 bool remote_detect(void)
 {
     return true;
@@ -96,32 +95,41 @@ bool remote_detect(void)
 void lcd_remote_on(void)
 {
     remote_power|=0x80;
-    remote_state_control=REMOTE_CONTROL_POWER;
+    remote_state_control_next=REMOTE_CONTROL_POWER;
 }
 
 void lcd_remote_off(void)
 {
     remote_power&=~(0x80);
-    remote_state_control=REMOTE_CONTROL_POWER;
+    remote_state_control_next=REMOTE_CONTROL_POWER;
 }
 
-unsigned char lcd_remote_test[16]=
-    {0x80,0xFF,0x80,0x00,0xFF,0x89,0x89,0x00,0xC1,0x89,0x8F,0x80,0xFF,0x80,0,0};
+/* This is the maximum transfer size to the remote (op 0x51= 7 bytes setup+79 
+ *  bytes screen data+xor+sum 
+ */
+unsigned char remote_payload[88];
+unsigned char remote_payload_size;
+bool remote_repeat_draw=false;
+
+unsigned char   remote_draw_x, remote_draw_y, 
+                remote_draw_width, remote_draw_height;
 
 /* Monitor remote hotswap */
 static void remote_tick(void)
 {
     unsigned char i;
-    unsigned char remote_payload[10], remote_payload_size;
-    unsigned char remote_check_xor, remote_check_sum;
+    static unsigned char pause_length=0;
+    
+    if(remote_state_control!=REMOTE_CONTROL_DRAW)
+        remote_state_control=remote_state_control_next;
     
     switch (remote_state_control)
     {
         case REMOTE_CONTROL_IDLE:
-            
             remote_payload_size=0;
             remote_state_control=REMOTE_CONTROL_IDLE;
             break;
+            
         case REMOTE_CONTROL_NOP:
             remote_payload[0]=0x11;
             remote_payload[1]=0x30;
@@ -129,6 +137,7 @@ static void remote_tick(void)
             remote_payload_size=2;
             remote_state_control=REMOTE_CONTROL_NOP;
             break;
+            
         case REMOTE_CONTROL_POWER:
             remote_payload[0]=0x31;
             remote_payload[1]=remote_power;
@@ -137,51 +146,65 @@ static void remote_tick(void)
             remote_payload_size=3;
             remote_state_control=REMOTE_CONTROL_NOP;
             break;
+            
         case REMOTE_CONTROL_MASK:
             remote_payload[0]=0x41;
-            remote_payload[1]=0x94;
+            remote_payload[1]=remote_mask;
             
             remote_payload_size=2;
             remote_state_control=REMOTE_CONTROL_NOP;
             break;
-        case REMOTE_CONTROL_DRAW1:
-            remote_payload[0]=0x51;
-            remote_payload[1]=0x80;
-            remote_payload[2]=14;
-            remote_payload[3]=0;
-            remote_payload[4]=0;
-            remote_payload[5]=14;
-            remote_payload[6]=8;
-            
-            remote_payload_size=7;
-            remote_state_control=REMOTE_CONTROL_DRAW_PAUSE1;
-            break;
-        case REMOTE_CONTROL_DRAW_PAUSE1:
-            remote_payload[0]=0x11;
-            remote_payload[1]=0x30;
             
-            remote_payload_size=2;
-            remote_state_control=REMOTE_CONTROL_DRAW2;
-            break;
-        case REMOTE_CONTROL_DRAW2:
+        case REMOTE_CONTROL_DRAW:
             remote_payload[0]=0x51;
             remote_payload[1]=0x80;
-            remote_payload[2]=14;
-            remote_payload[3]=0;
-            remote_payload[4]=8;
-            remote_payload[5]=14;
-            remote_payload[6]=16; 
+            remote_payload[2]=remote_draw_width;
+            remote_payload[3]=remote_draw_x;
             
-            remote_payload_size=7;
-            remote_state_control=REMOTE_CONTROL_DRAW_PAUSE2;
-            break;
-        case REMOTE_CONTROL_DRAW_PAUSE2:
-            remote_payload[0]=0x11;
-            remote_payload[1]=0x30;
+            remote_payload[5]=remote_draw_x+remote_draw_width;
+            remote_payload_size=7+remote_payload[2];
             
-            remote_payload_size=2;
-            remote_state_control=REMOTE_CONTROL_NOP;
+            switch (remote_state_draw)
+            {
+                case DRAW_TOP:
+                    remote_payload[4]=0;
+                    remote_payload[6]=8;
+                    
+                    pause_length=6;
+                    remote_state_draw_next=DRAW_BOTTOM;
+                    remote_state_draw=DRAW_PAUSE;
+                    break;
+                    
+                case DRAW_BOTTOM:
+                    remote_payload[4]=8;
+                    remote_payload[6]=16;
+                    
+                    pause_length=6;
+                    remote_state_draw_next=DRAW_TOP;
+                    remote_state_draw=DRAW_PAUSE;
+                    break;
+                    
+                case DRAW_PAUSE:
+                    remote_payload_size=0;
+                    
+                    if(--pause_length==0)
+                    {
+                        if(remote_state_draw_next==DRAW_TOP)
+                            remote_state_control=REMOTE_CONTROL_NOP;
+                            
+                        remote_state_draw=remote_state_draw_next;
+                    }
+                    else
+                        remote_state_draw=DRAW_PAUSE;
+
+                    break;
+                    
+                default:
+                    remote_payload_size=0;
+                    break;
+            }
             break;
+            
         case REMOTE_CONTROL_SLEEP:
             remote_payload[0]=0x71;
             remote_payload[1]=0x30;
@@ -189,6 +212,7 @@ static void remote_tick(void)
             remote_payload_size=2;
             remote_state_control=REMOTE_CONTROL_IDLE;
             break;
+            
         default:
             remote_payload_size=0;
             break;
@@ -199,46 +223,25 @@ static void remote_tick(void)
         return;
     }
     
-    remote_check_xor=remote_payload[0];
-    remote_check_sum=remote_payload[0];
-    for(i=1; i<remote_payload_size; i++)
-    {
-        remote_check_xor^=remote_payload[i];
-        remote_check_sum+=remote_payload[i];
-    }
-    
     if(remote_payload[0]==0x51)
     {
-        unsigned char offset;
-        unsigned char x;
-        
-        if(remote_payload[4]==8)
-        {
-            offset=79;
-        }
-        else
-        {
-            offset=0;
-        }
-    
-        for (x = 0; x < 14; x++)
+        for(i=7; i<remote_payload_size; i++)
         {
-            remote_check_xor^=lcd_remote_test[x];
-            remote_check_sum+=lcd_remote_test[x];
+            remote_payload[i]=
+                lcd_remote_framebuffer[remote_payload[4]>>3][i+remote_draw_x-7];
         }
-
-        uart1_puts(remote_payload, remote_payload_size);
-        lcd_remote_test[14]=remote_check_xor;
-        lcd_remote_test[15]=remote_check_sum;
-        uart1_puts(lcd_remote_test, 16);
     }
-    else
-    {
-        remote_payload[remote_payload_size]=remote_check_xor;
-        remote_payload[remote_payload_size+1]=remote_check_sum;
     
-        uart1_puts(remote_payload, remote_payload_size+2);
+    /* Calculate the xor and sum to place in the payload */
+    remote_payload[remote_payload_size]=remote_payload[0];
+    remote_payload[remote_payload_size+1]=remote_payload[0];
+    for(i=1; i<remote_payload_size; i++)
+    {
+        remote_payload[remote_payload_size]^=remote_payload[i];
+        remote_payload[remote_payload_size+1]+=remote_payload[i];
     }
+
+    uart1_puts(remote_payload, remote_payload_size+2);
 }
 
 void lcd_remote_init_device(void)
@@ -247,6 +250,8 @@ void lcd_remote_init_device(void)
     if (remote_detect())
         lcd_remote_on();
 
+    lcd_remote_update();
+
     /* put the remote control in the tick task */
     tick_add_task(remote_tick);
 }
@@ -255,33 +260,28 @@ void lcd_remote_init_device(void)
    This must be called after all other LCD functions that change the display. */
 void lcd_remote_update(void)
 {
-    if(remote_state_control!=REMOTE_CONTROL_DRAW1
-        && remote_state_control!=REMOTE_CONTROL_DRAW_PAUSE1
-        && remote_state_control!=REMOTE_CONTROL_DRAW2
-        && remote_state_control!=REMOTE_CONTROL_DRAW_PAUSE2)
-    {
-        remote_state_control=REMOTE_CONTROL_DRAW1;
-    }
+    lcd_remote_update_rect(0, 0, LCD_REMOTE_WIDTH, LCD_REMOTE_HEIGHT);
 }
 
 /* Update a fraction of the display. */
 void lcd_remote_update_rect(int x, int y, int width, int height)
 {
-    (void)x;
-    (void)y;
-    (void)width;
-    (void)height;
-    lcd_remote_update();
+    remote_draw_x=x;
+    remote_draw_y=y;
+    remote_draw_width=width;
+    remote_draw_height=height;
+    
+    remote_state_control=REMOTE_CONTROL_DRAW;
 }
 
 void _remote_backlight_on(void)
 {
     remote_power|=0x40;
-    remote_state_control=REMOTE_CONTROL_POWER;
+    remote_state_control_next=REMOTE_CONTROL_POWER;
 }
 
 void _remote_backlight_off(void)
 {
     remote_power&=~(0x40);
-    remote_state_control=REMOTE_CONTROL_POWER;
+    remote_state_control_next=REMOTE_CONTROL_POWER;
 }
diff --git a/firmware/target/arm/tms320dm320/uart-dm320.c b/firmware/target/arm/tms320dm320/uart-dm320.c
index 5e2ad5e2be..d68beb6e01 100644
--- a/firmware/target/arm/tms320dm320/uart-dm320.c
+++ b/firmware/target/arm/tms320dm320/uart-dm320.c
@@ -27,37 +27,48 @@
 
 #define MAX_UART_BUFFER     31
 #define SEND_RING_SIZE      256
-#define RECIEVE_RING_SIZE   20
+#define RECEIVE_RING_SIZE   20
 
 char
-//    uart1_send_buffer_ring[SEND_RING_SIZE],
-    uart1_recieve_buffer_ring[RECIEVE_RING_SIZE];
+    uart1_send_buffer_ring[SEND_RING_SIZE],
+    uart1_receive_buffer_ring[RECEIVE_RING_SIZE];
 
-//static unsigned int uart1_send_count, uart1_send_read, uart1_send_write;
-static unsigned int uart1_recieve_count, uart1_recieve_read, uart1_recieve_write;
+static volatile int uart1_send_count, uart1_send_read, uart1_send_write;
+static volatile int uart1_receive_count, uart1_receive_read, uart1_receive_write;
 
 void uart_init(void)
 {
     // 8-N-1
-    IO_UART1_MSR = 0x8000;
+    IO_UART1_MSR = 0xC400;
     IO_UART1_BRSR = 0x0057;
-    IO_UART1_RFCR = 0x8010; /* Trigger later */
+    IO_UART1_RFCR = 0x8020; /* Trigger later */
+    IO_UART1_TFCR = 0x0000; /* Trigger level */
     /* gio 27 is input, uart1 rx
        gio 28 is output, uart1 tx */
     IO_GIO_DIR1 |=  (1<<11); /* gio 27 */
     IO_GIO_DIR1 &= ~(1<<12); /* gio 28 */
 
-    /* init the recieve buffer */
-    uart1_recieve_count=0;
-    uart1_recieve_read=0;
-    uart1_recieve_write=0;
+    /* init the receive buffer */
+    uart1_receive_count=0;
+    uart1_receive_read=0;
+    uart1_receive_write=0;
+    
+    /* init the send buffer */
+    uart1_send_count=0;
+    uart1_send_read=0;
+    uart1_send_write=0;
 
     /* Enable the interrupt */
     IO_INTC_EINT0 |= INTR_EINT0_UART1;
 }
 
+
+/* This function is not interrupt driven */
 void uart1_putc(char ch)
 {
+    /* Wait for the interupt driven puts to finish */
+    while(uart1_send_count>0);
+
     /* Wait for room in FIFO */
     while ((IO_UART1_TFCR & 0x3f) >= 0x20);
     
@@ -67,45 +78,73 @@ void uart1_putc(char ch)
 
 void uart1_puts(const char *str, int size)
 {
-    int count=0;
-    while (count<size) 
+    if(size>SEND_RING_SIZE)
+        panicf("Too much data passed to uart1_puts");
+
+    /* Wait for the previous transfer to finish */
+    while(uart1_send_count>0);
+        
+    memcpy(uart1_send_buffer_ring, str, size);
+    
+    /* Disable interrupt while modifying the pointers */
+    IO_INTC_EINT0 &= ~INTR_EINT0_UART1;
+    
+    uart1_send_count=size;
+    uart1_send_read=0;
+    
+    /* prime the hardware buffer */
+    while(((IO_UART1_TFCR & 0x3f) < 0x20) && (uart1_send_count > 0))
     {
-        uart1_putc(str[count]);
-        count++;
+        IO_UART1_DTRR=uart1_send_buffer_ring[uart1_send_read++];
+        uart1_send_count--;
     }
+    
+    /* Enable interrupt */
+    IO_INTC_EINT0 |= INTR_EINT0_UART1;
+}
+
+void uart1_clear_queue(void)
+{
+    /* Disable interrupt while modifying the pointers */
+    IO_INTC_EINT0 &= ~INTR_EINT0_UART1;
+    uart1_receive_write=0;
+    uart1_receive_count=0;
+    uart1_receive_read=0;
+    /* Enable interrupt */
+    IO_INTC_EINT0 |= INTR_EINT0_UART1;
 }
 
 /* This function returns the number of bytes left in the queue after a read is done (negative if fail)*/
-int uart1_gets_queue(char *str, unsigned int size)
+int uart1_gets_queue(char *str, int size)
 {
+    /* Disable the interrupt while modifying the pointers */
     IO_INTC_EINT0 &= ~INTR_EINT0_UART1;
     int retval;
     
-    if(uart1_recieve_count<size)
+    if(uart1_receive_count<size)
     {
         retval= -1;
     }    
     else
     {
-        if(uart1_recieve_read+size<RECIEVE_RING_SIZE)
+        if(uart1_receive_read+size<=RECEIVE_RING_SIZE)
         {
-            memcpy(str,uart1_recieve_buffer_ring+uart1_recieve_read,size);
+            memcpy(str,uart1_receive_buffer_ring+uart1_receive_read,size);
+            
+            uart1_receive_read+=size;
         }
         else
         {
-            int tempcount=(RECIEVE_RING_SIZE-uart1_recieve_read);
-            memcpy(str,uart1_recieve_buffer_ring+uart1_recieve_read,tempcount);
-            memcpy(str+tempcount,uart1_recieve_buffer_ring,size-tempcount);
+            int tempcount=(RECEIVE_RING_SIZE-uart1_receive_read);
+            memcpy(str,uart1_receive_buffer_ring+uart1_receive_read,tempcount);
+            memcpy(str+tempcount,uart1_receive_buffer_ring,size-tempcount);
+            
+            uart1_receive_read=size-tempcount;
         }
     
-        uart1_recieve_count-=size;
-    
-        if(uart1_recieve_read+size<RECIEVE_RING_SIZE)
-            uart1_recieve_read+=size;
-        else
-            uart1_recieve_read=size-(RECIEVE_RING_SIZE-uart1_recieve_read);
-            
-        retval=uart1_recieve_count;
+        uart1_receive_count-=size;
+
+        retval=uart1_receive_count;
     }
 
     /* Enable the interrupt */
@@ -114,23 +153,29 @@ int uart1_gets_queue(char *str, unsigned int size)
     return retval;
 }
 
-/* UART1 receive interupt handler */
+/* UART1 receive/transmit interupt handler */
 void UART1(void)
 {
     while (IO_UART1_RFCR & 0x3f)
     {
-        if (uart1_recieve_count > RECIEVE_RING_SIZE)
-            panicf("UART1 buffer overflow");
+        if (uart1_receive_count > RECEIVE_RING_SIZE)
+            panicf("UART1 receive buffer overflow");
         else
         {
-            if(uart1_recieve_write>=RECIEVE_RING_SIZE)
-                uart1_recieve_write=0;
+            if(uart1_receive_write>=RECEIVE_RING_SIZE)
+                uart1_receive_write=0;
 
-            uart1_recieve_buffer_ring[uart1_recieve_write] = IO_UART1_DTRR & 0xff;
-            uart1_recieve_write++;
-            uart1_recieve_count++;
+            uart1_receive_buffer_ring[uart1_receive_write]=IO_UART1_DTRR & 0xff;
+            uart1_receive_write++;
+            uart1_receive_count++;
         }
     }
 
+    while ( ((IO_UART1_TFCR & 0x3f) < 0x20) && (uart1_send_count > 0) )
+    {
+        IO_UART1_DTRR=uart1_send_buffer_ring[uart1_send_read++];
+        uart1_send_count--;
+    }
+
     IO_INTC_IRQ0 = INTR_IRQ0_UART1;
 }
diff --git a/firmware/target/arm/tms320dm320/uart-target.h b/firmware/target/arm/tms320dm320/uart-target.h
index 68145b8358..9be9ba51fe 100644
--- a/firmware/target/arm/tms320dm320/uart-target.h
+++ b/firmware/target/arm/tms320dm320/uart-target.h
@@ -23,10 +23,10 @@
 void uart_init(void);
 bool uart1_available(void);
 
-int uart1_gets_queue(char *, unsigned int);
+int uart1_gets_queue(char *, int);
 void uart1_puts(const char *str, int size);
-void uart1_gets(char *str, unsigned int size);
+void uart1_gets(char *str, int size);
 void uart1_putc(char ch);
 
-
+void uart1_clear_queue(void);
 #endif
-- 
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