slow - but working - IRQ based uart/button driver.

change some of the uart function names from CamelCase


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14908 a1c6a512-1295-4272-9138-f99709370657

bootloader/mrobe500.c

@@ -58,7 +58,7 @@ void main(void)
     adc_init();
     button_init();
     backlight_init();
-    uartSetup();
+    uart_init();
 
     font_init();
     spi_init();
@@ -104,6 +104,8 @@ void main(void)
     while(true)
     {
         button = button_read_device();
+        if (button)
+            printf("btn: %x", button);
         if (button == BUTTON_POWER)
         {
             printf("reset");
@@ -121,6 +123,7 @@ void main(void)
    //     if ((IO_GIO_BITSET0&(1<<14) == 0)
         {
             short x,y,z1,z2, reg;
+            extern int uart1count;
             tsc2100_read_values(&x, &y, &z1, &z2);
             printf("x: %04x y: %04x z1: %04x z2: %04x", x, y, z1, z2);
             printf("tsadc: %4x", tsc2100_readreg(TSADC_PAGE, TSADC_ADDRESS)&0xffff);
@@ -128,8 +131,10 @@ void main(void)
             printf("Address: 0x%08x Data: 0x%08x", address, *address);
             printf("Address: 0x%08x Data: 0x%08x", address+1, *(address+1));
             printf("Address: 0x%08x Data: 0x%08x", address+2, *(address+2));
+            printf("uart1count: %d", uart1count);
+            printf("%x %x", IO_UART1_RFCR & 0x3f, IO_UART1_DTRR & 0xff);
             tsc2100_keyclick(); /* doesnt work :( */
-            line -= 6;
+            line -= 8;
         }
     }
 #endif

firmware/target/arm/olympus/mrobe-500/button-mr500.c

@@ -37,7 +37,7 @@
 void button_init_device(void)
 {
     /* GIO is the power button, set as input */
-    IO_GIO_DIR0|=0x01;
+    IO_GIO_DIR0 |= 0x01;
 }
 
 inline bool button_hold(void)
@@ -48,20 +48,17 @@ inline bool button_hold(void)
 int button_read_device(void)
 {
     char data[5], c;
-    int val;
     int i = 0;
-    int btn = BUTTON_NONE, timeout = BUTTON_TIMEOUT;
+    int btn = BUTTON_NONE;
     
     if ((IO_GIO_BITSET0&0x01) == 0)
         btn |= BUTTON_POWER;
         
-    uartHeartbeat();
-    while (timeout > 0)
+    uart1_heartbeat();
+    while (uartAvailable())
     {
-        val = uartPollch(BUTTON_TIMEOUT*100);
-        if (val > -1)
+        if (uart1_getch(&c))
         {
-            c = val&0xff;
             if (i && (data[0] == BUTTON_START_BYTE || data[0] == BUTTON_START_BYTE2))
             {
                 data[i++] = c;
@@ -94,7 +91,6 @@ int button_read_device(void)
                 break;
             }
         }
-        timeout--;
     }
     return btn;
 }

firmware/target/arm/olympus/mrobe-500/uart-mr500.c

@@ -23,7 +23,10 @@
 
 /* UART 0/1 */
 
-#define CONFIG_UART_BRSR            87
+#define CONFIG_UART_BRSR    87
+#define MAX_UART_BUFFER     32
+static unsigned char uart1buffer[MAX_UART_BUFFER];
+int uart1read = 0, uart1write = 0, uart1count = 0;
 
 void do_checksums(char *data, int len, char *xor, char *add)
 {
@@ -37,10 +40,24 @@ void do_checksums(char *data, int len, char *xor, char *add)
     }
 }
 
-void uartSetup(void) {
+void uart_init(void) 
+{
     // 8-N-1
     IO_UART1_MSR=0x8000;
     IO_UART1_BRSR=CONFIG_UART_BRSR;
+    IO_UART1_RFCR = 0x8000;
+    /* 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 */
+    uart1read = 0;
+    uart1write = 0;
+    uart1count = 0;
+    
+    /* Enable the interrupt */
+    IO_INTC_EINT0 |= (1<<IRQ_UART1);
 }
 
 void uartPutc(char ch) {
@@ -111,10 +128,10 @@ int uartPollch(unsigned int ticks) {
 
 bool uartAvailable(void)
 {
-    return (IO_UART1_RFCR & 0x3f)?true:false;
+    return uart1count > 0;
 }
 
-void uartHeartbeat(void)
+void uart1_heartbeat(void)
 {
     char data[5] = {0x11, 0x30, 0x11^0x30, 0x11+0x30, '\0'};
     uartPuts(data);
@@ -126,3 +143,30 @@ void uartSendData(char* data, int len)
     for(i=0;i<len;i++)
         uartPutc(data[i]);
 }
+
+bool uart1_getch(char *c)
+{
+    if (uart1count > 0)
+    {
+        *c = uart1buffer[uart1read];
+        uart1read = (uart1read+1) % MAX_UART_BUFFER;
+        uart1count--;
+        return true;
+    }
+    return false;
+}
+
+/* UART1 receive intterupt handler */
+void UART1(void)
+{
+    if (IO_UART1_RFCR & 0x3f)
+    {
+        if (uart1count >= MAX_UART_BUFFER)
+            panicf("UART1 buffer overflow");
+        uart1buffer[uart1write] = IO_UART1_DTRR & 0xff;
+        uart1write = (uart1write+1) % MAX_UART_BUFFER;
+        uart1count++;
+    }
+    
+    IO_INTC_IRQ0 = (1<<IRQ_UART1);
+}

firmware/target/arm/olympus/mrobe-500/uart-target.h

@@ -20,12 +20,14 @@
 #ifndef UART_H
 #define UART_H
 
-void uartPutc(char ch);
-void uartPutHex(unsigned int n);
-void uartSetup(void);
+void uart_init(void);
+bool uart1_getch(char *c);
+void uart1_heartbeat(void);
+
 void uartPuts(const char *str);
 void uartGets(char *str, unsigned int size);
 int  uartPollch(unsigned int ticks);
-void uartHeartbeat(void);
+void uartPutc(char ch);
+void uartPutHex(unsigned int n);
 
 #endif