Support sub-word access with the command-line tools.

Provide a slave which is useful for testing endian.

api/demo/eb-read.c

@@ -48,19 +48,24 @@ int main(int argc, const char** argv) {
   eb_status_t status;
   eb_device_t device;
   eb_width_t width;
+  eb_width_t op_width;
   eb_cycle_t cycle;
   eb_address_t address;
   const char* netaddress;
   int stop;
   
-  if (argc != 3) {
-    fprintf(stderr, "Syntax: %s <protocol/host/port> <address>\n", argv[0]);
+  if (argc < 3 || argc > 4) {
+    fprintf(stderr, "Syntax: %s <protocol/host/port> <address> [width]\n", argv[0]);
     return 1;
   }
   
   netaddress = argv[1];
   address = strtoll(argv[2], 0, 0);
   
+  op_width = EB_DATAX;
+  if (argc == 4)
+    op_width &= strtol(argv[3], 0, 0);
+  
   if ((status = eb_socket_open(0, EB_DATAX|EB_ADDRX, &socket)) != EB_OK) {
     fprintf(stderr, "Failed to open Etherbone socket: %s\n", eb_status(status));
     return 1;
@@ -82,7 +87,7 @@ int main(int argc, const char** argv) {
     return 1;
   }
   
-  eb_cycle_read(cycle, address, EB_DATAX, 0);
+  eb_cycle_read(cycle, address, op_width, 0);
   eb_cycle_close(cycle);
 
   stop = 0;

api/demo/eb-snoop.c

@@ -30,9 +30,20 @@
 #include "../etherbone.h"
 
 static eb_status_t my_read(eb_user_data_t user, eb_address_t address, eb_width_t width, eb_data_t* data) {
+  eb_data_t out;
+  
   fprintf(stdout, "Received read to address %016"EB_ADDR_FMT" of %d bits\n", address, (width&EB_DATAX)*8);
-  *data = UINT64_C(0x1234567890abcdef);
-  return (address==0)?EB_FAIL:EB_OK;
+  
+  /* Pretend to be a bigendian device with the identity function */
+  width &= EB_DATAX;
+  for (out = 0; width > 0; --width) {
+    out <<= 8;
+    out |= address & 0xFF;
+    ++address;
+  }
+  
+  *data = out;
+  return EB_OK;
 }
 
 static eb_status_t my_write(eb_user_data_t user, eb_address_t address, eb_width_t width, eb_data_t data) {

api/demo/eb-write.c

@@ -48,14 +48,15 @@ int main(int argc, const char** argv) {
   eb_status_t status;
   eb_device_t device;
   eb_width_t width;
+  eb_width_t op_width;
   eb_cycle_t cycle;
   eb_address_t address;
   eb_data_t data;
   const char* netaddress;
   int stop;
   
-  if (argc != 4) {
-    fprintf(stderr, "Syntax: %s <protocol/host/port> <address> <data>\n", argv[0]);
+  if (argc < 4 || argc > 5) {
+    fprintf(stderr, "Syntax: %s <protocol/host/port> <address> <data> [width]\n", argv[0]);
     return 1;
   }
   
@@ -63,6 +64,10 @@ int main(int argc, const char** argv) {
   address = strtoll(argv[2], 0, 0);
   data = strtoll(argv[3], 0, 0);
   
+  op_width = EB_DATAX;
+  if (argc == 5)
+    op_width &= strtol(argv[4], 0, 0);
+  
   if ((status = eb_socket_open(0, EB_DATAX|EB_ADDRX, &socket)) != EB_OK) {
     fprintf(stderr, "Failed to open Etherbone socket: %s\n", eb_status(status));
     return 1;
@@ -84,7 +89,7 @@ int main(int argc, const char** argv) {
     return 1;
   }
   
-  eb_cycle_write(cycle, address, EB_DATAX, data);
+  eb_cycle_write(cycle, address, op_width, data);
   eb_cycle_close(cycle);
   
   stop = 0;