* refactored uart / chardev handling

board/msba2/drivers/Jamfile

@@ -3,4 +3,5 @@ SubDir TOP board msba2 drivers ;
 Module board_cc1100 : msba2-cc1100.c ;
 Module board_hal : msba2-hal.c ; 
 Module board_ltc4150 : msba2-ltc4150.c : gpioint ;
-Module board_common : msba2-uart0.c msba2-uart0_thread.c : ringbuffer ;
+Module board_common : msba2-uart0.c : ringbuffer ;
+Module board_uart : msba2-uart0_thread.c : chardev_thread ;

board/msba2/drivers/msba2-uart0.c

@@ -110,11 +110,9 @@ int uart_active(void){
 }
 
 static void notify_handler() {
-    if (uart0_handler_pid) {
-        msg m;
-        m.type = 0;
-        msg_send_int(&m, uart0_handler_pid);
-    }
+    msg m;
+    m.type = 0;
+    msg_send_int(&m, uart0_handler_pid);
 }
 
 void stdio_flush(void)
@@ -142,14 +140,15 @@ void UART0_IRQHandler(void)
 
         case UIIR_CTI_INT:                // Character Timeout Indicator
         case UIIR_RDA_INT:                // Receive Data Available
-            do {
-                int c = U0RBR;
-                rb_add_element(&uart0_ringbuffer, c);
-            } while (U0LSR & ULSR_RDR);
-
-            notify_handler();
-            break;
-
+            if (uart0_handler_pid) {
+                do {
+                    int c = U0RBR;
+                    rb_add_element(&uart0_ringbuffer, c);
+                } while (U0LSR & ULSR_RDR);
+
+                notify_handler();
+                break;
+            }
         default:
             U0LSR;
             U0RBR;

board/msba2/drivers/msba2-uart0_thread.c

@@ -1,101 +1,25 @@
-#include <thread.h>
-#include <kernel.h>
-#include <msg.h>
-#include <board.h>
+#include <chardev_thread.h>
 #include <ringbuffer.h>
-
 #include <stdio.h>
-#include <errno.h>
-#include <irq.h>
-#include <posix_io.h>
-#include "uart0.h"
+#include <thread.h>
+
+#include <board_uart0.h>
+
+#define UART0_BUFSIZE 32
 
-//#define ENABLE_DEBUG
-#include <debug.h>
+extern ringbuffer uart0_ringbuffer;
+extern int uart0_handler_pid;
 
 static char buffer[UART0_BUFSIZE];
-ringbuffer uart0_ringbuffer;
 
-static void uart0_loop();
+static void uart0_loop() {
+    chardev_loop(&uart0_ringbuffer);
+}
 
-void uart0_init() {
+void board_uart0_init() {
     ringbuffer_init(&uart0_ringbuffer, buffer, UART0_BUFSIZE);
     int pid = thread_create(KERNEL_CONF_STACKSIZE_MAIN, PRIORITY_MAIN-1, CREATE_STACKTEST, uart0_loop, "uart0");
     uart0_handler_pid = pid;
     puts("uart0_init() [OK]");
 }
 
-static int min(int a, int b) {
-    if (b>a) return a;
-    else return b;
-}
-
-static void uart0_loop() {
-    msg m;
-
-    int pid = thread_getpid();
-
-    int reader_pid = -1;
-    struct posix_iop *r = NULL;
-
-    puts("UART0 thread started.");
-
-    while (1) {
-        msg_receive(&m);
-
-        if (m.sender_pid == pid) {
-        } else {
-            switch (m.type) {
-                case OPEN:
-                    if (reader_pid == -1) {
-                        reader_pid = m.sender_pid;
-                        m.content.value = 0; // no error
-                    } else {
-                        m.content.value = -EBUSY;
-                    }
-                    msg_reply(&m,&m);
-                    break;
-                case READ:
-                    if (m.sender_pid != reader_pid) {
-                        m.content.value = -EINVAL;
-                        msg_reply(&m, &m);
-                    } else {
-                        r = (struct posix_iop *)m.content.ptr;
-                    }
-                    break;
-                case CLOSE:
-                    if (m.sender_pid == reader_pid) {
-                        DEBUG("uart0_thread: closing file from %i\n", reader_pid);
-                        reader_pid = -1;
-                        r = NULL;
-                        m.content.value = 0;
-                    } else {
-                        m.content.value = -EINVAL;
-                    }
-                    msg_reply(&m,&m);
-                    break;
-                default:
-                    m.content.value = -EINVAL;
-                    msg_reply(&m, &m);
-            }
-        }
-
-        if (uart0_ringbuffer.avail && (r != NULL)) {
-            int state = disableIRQ();
-            int nbytes = min(r->nbytes, uart0_ringbuffer.avail);
-            DEBUG("uart0_thread: sending %i bytes to pid %i\n", nbytes, reader_pid);
-            rb_get_elements(&uart0_ringbuffer, r->buffer, nbytes);
-            r->nbytes = nbytes;
-
-            m.sender_pid = reader_pid;
-            m.type = OPEN;
-            m.content.ptr = (char*)r;
-
-            msg_reply(&m, &m);
-           // DEBUG("uart0_thread: sending res=%i\n", res);
-
-            r = NULL;
-            restoreIRQ(state);
-        }
-    }
-}

projects/test_shell/Jamfile

@@ -6,6 +6,6 @@
 
 SubDir TOP projects test_shell ;
 
-Module test_shell : test_shell.c : shell posix_io shell_auto_init ps ;
+Module test_shell : test_shell.c : shell posix_io shell_auto_init ps board_uart ;
 
 UseModule test_shell ;

projects/test_shell/test_shell.c

@@ -6,9 +6,9 @@
 #include <string.h>
 #include <malloc.h>
 
-#include <uart0.h>
 #include <posix_io.h>
 #include <shell.h>
+#include <board_uart0.h>
 
 void print_teststart(char* str) {
     printf("[TEST_START]\n");
@@ -27,16 +27,20 @@ int shell_readc() {
     return c;
 }
 
+void shell_putchar(int c) {
+    putchar(c);
+}
+
 int main(void) {
     //printf("Moin. build on %s %s SVN-Revision: %s\n", kernel_builddate, kernel_buildtime, kernel_svnrevision);
     printf("test_shell.\n");
 
-    uart0_init();
+    board_uart0_init();
 
     posix_open(uart0_handler_pid, 0);
 
     shell_t shell;
-    shell_init(&shell, shell_readc);
+    shell_init(&shell, shell_readc, shell_putchar);
     shell_auto_init(&shell);
     
     shell_register_cmd(&shell, "start_test", print_teststart);

sys/Jamfile

@@ -32,6 +32,8 @@ Module posix_io : posix_io.c ;
 
 Module auto_init : auto_init.c ;
 
+Module chardev_thread : chardev_thread.c : ringbuffer ;
+
 SubInclude TOP sys net ;
 SubInclude TOP sys lib ;
 SubInclude TOP sys shell ;

sys/chardev_thread.c

@@ -0,0 +1,87 @@
+#include <thread.h>
+#include <kernel.h>
+#include <msg.h>
+#include <ringbuffer.h>
+
+#include <stdio.h>
+#include <errno.h>
+#include <irq.h>
+#include <posix_io.h>
+
+//#define ENABLE_DEBUG
+#include <debug.h>
+
+static int min(int a, int b) {
+    if (b>a) return a;
+    else return b;
+}
+
+void chardev_loop(ringbuffer *rb) {
+    msg m;
+
+    int pid = thread_getpid();
+
+    int reader_pid = -1;
+    struct posix_iop *r = NULL;
+
+    puts("UART0 thread started.");
+
+    while (1) {
+        msg_receive(&m);
+
+        if (m.sender_pid == pid) {
+        } else {
+            switch (m.type) {
+                case OPEN:
+                    if (reader_pid == -1) {
+                        reader_pid = m.sender_pid;
+                        m.content.value = 0; // no error
+                    } else {
+                        m.content.value = -EBUSY;
+                    }
+                    msg_reply(&m,&m);
+                    break;
+                case READ:
+                    if (m.sender_pid != reader_pid) {
+                        m.content.value = -EINVAL;
+                        msg_reply(&m, &m);
+                    } else {
+                        r = (struct posix_iop *)m.content.ptr;
+                    }
+                    break;
+                case CLOSE:
+                    if (m.sender_pid == reader_pid) {
+                        DEBUG("uart0_thread: closing file from %i\n", reader_pid);
+                        reader_pid = -1;
+                        r = NULL;
+                        m.content.value = 0;
+                    } else {
+                        m.content.value = -EINVAL;
+                    }
+                    msg_reply(&m,&m);
+                    break;
+                default:
+                    m.content.value = -EINVAL;
+                    msg_reply(&m, &m);
+            }
+        }
+
+        if (rb->avail && (r != NULL)) {
+            int state = disableIRQ();
+            int nbytes = min(r->nbytes, rb->avail);
+            DEBUG("uart0_thread: sending %i bytes to pid %i\n", nbytes, reader_pid);
+            rb_get_elements(rb, r->buffer, nbytes);
+            r->nbytes = nbytes;
+
+            m.sender_pid = reader_pid;
+            m.type = OPEN;
+            m.content.ptr = (char*)r;
+
+            msg_reply(&m, &m);
+           // DEBUG("uart0_thread: sending res=%i\n", res);
+
+            r = NULL;
+            restoreIRQ(state);
+        }
+    }
+}

sys/include/board_uart0.h

@@ -0,0 +1,8 @@
+#ifndef __BOARD_UART0_H
+#define __BOARD_UART0_H 
+
+extern int uart0_handler_pid;
+
+void board_uart0_init();
+
+#endif /* __BOARD_UART0_H */

sys/include/chardev_thread.h

@@ -0,0 +1,8 @@
+#ifndef __CHARDEV_THREAD_H
+#define __CHARDEV_THREAD_H 
+
+#include <ringbuffer.h>
+
+void chardev_loop(ringbuffer *rb);
+
+#endif /* __CHARDEV_THREAD_H */

sys/include/shell.h

@@ -24,8 +24,8 @@ and the mailinglist (subscription via web site)
 	scatterweb@lists.spline.inf.fu-berlin.de
 *******************************************************************************/
 
-#ifndef __SIMPLE_SHELL_H
-#define __SIMPLE_SHELL_H 
+#ifndef __SHELL_H
+#define __SHELL_H 
 
 /**
  * @defgroup shell Simple Shell Interpreter
@@ -37,12 +37,13 @@ and the mailinglist (subscription via web site)
 typedef struct shell_t {
     struct hashtable *h;
     int (*readchar)(void); 
+    void (*put_char)(int); 
 } shell_t;
 
 /**
  * @brief Initialize a shell object
  */
-void shell_init(shell_t *shell, int(*readchar)(void)); 
+void shell_init(shell_t *shell, int(*read_char)(void), void (*put_char)(int));
 
 /**
  * @brief Register a new command handler for a shell.
@@ -60,4 +61,4 @@ void shell_run(shell_t *shell);
 
 void shell_auto_init(shell_t *shell);
 
-#endif /* __SIMPLE_SHELL_H */
+#endif /* __SHELL_H */

sys/shell/shell.c

@@ -77,8 +77,7 @@ int readline(shell_t *shell, char* buf, int size) {
         }
 
         c = shell->readchar();
-
-        write(STDOUT_FILENO, &c, 1);
+        shell->put_char(c);
 
         if (c == 13) continue;
 
@@ -95,7 +94,7 @@ void shell_run(shell_t *shell) {
     char line_buf[255];
 
     while(1) {
-        write(STDOUT_FILENO, ">", 1);
+        shell->put_char('>');
         int res = readline(shell, line_buf, sizeof(line_buf));
         if (! res ) {
             handle_input_line(shell, strdup(line_buf));
@@ -103,9 +102,10 @@ void shell_run(shell_t *shell) {
     }
 }
 
-void shell_init(shell_t *shell, int(*readchar)(void)) {
+void shell_init(shell_t *shell, int(*readchar)(void), void(*put_char)(int)) {
     shell->h = create_hashtable(16, (unsigned int (*)(void*)) hash_string, (int (*) (void*,void*)) cmp_string);
     shell->readchar = readchar;
+    shell->put_char = put_char;
 }
 
 void shell_register_cmd(shell_t *shell, char* name, void (*handler)(char* args)) {