diff options
Diffstat (limited to 'nuttx/configs/README.txt')
| -rw-r--r-- | nuttx/configs/README.txt | 88 |
1 files changed, 54 insertions, 34 deletions
diff --git a/nuttx/configs/README.txt b/nuttx/configs/README.txt index 41c90e387..5eee4786c 100644 --- a/nuttx/configs/README.txt +++ b/nuttx/configs/README.txt @@ -499,29 +499,29 @@ defconfig -- This is a configuration file similar to the Linux CONFIG_ARCH_MATH_H, CONFIG_ARCH_STDBOOL_H, CONFIG_ARCH_STDINT_H - CONFIG_ARCH_ROMGETC - In Harvard architectures, data accesses and - instruction accesses occur on different busses, perhaps - concurrently. All data accesses are performed on the data bus - unless special machine instructions are used to read data - from the instruction address space. Also, in the typical - MCU, the available SRAM data memory is much smaller that the - non-volatile FLASH instruction memory. So if the application - requires many constant strings, the only practical solution may - be to store those constant strings in FLASH memory where they - can only be accessed using architecture-specific machine - instructions. - - If CONFIG_ARCH_ROMGETC is defined, then the architecture logic - must export the function up_romgetc(). up_romgetc() will simply - read one byte of data from the instruction space. + CONFIG_ARCH_ROMGETC - In Harvard architectures, data accesses and + instruction accesses occur on different busses, perhaps + concurrently. All data accesses are performed on the data bus + unless special machine instructions are used to read data + from the instruction address space. Also, in the typical + MCU, the available SRAM data memory is much smaller that the + non-volatile FLASH instruction memory. So if the application + requires many constant strings, the only practical solution may + be to store those constant strings in FLASH memory where they + can only be accessed using architecture-specific machine + instructions. + + If CONFIG_ARCH_ROMGETC is defined, then the architecture logic + must export the function up_romgetc(). up_romgetc() will simply + read one byte of data from the instruction space. - If CONFIG_ARCH_ROMGETC, certain C stdio functions are effected: - (1) All format strings in printf, fprintf, sprintf, etc. are - assumed to lie in FLASH (string arguments for %s are still assumed - to reside in SRAM). And (2), the string argument to puts and fputs - is assumed to reside in FLASH. Clearly, these assumptions may have - to modified for the particular needs of your environment. There - is no "one-size-fits-all" solution for this problem. + If CONFIG_ARCH_ROMGETC, certain C stdio functions are effected: + (1) All format strings in printf, fprintf, sprintf, etc. are + assumed to lie in FLASH (string arguments for %s are still assumed + to reside in SRAM). And (2), the string argument to puts and fputs + is assumed to reside in FLASH. Clearly, these assumptions may have + to modified for the particular needs of your environment. There + is no "one-size-fits-all" solution for this problem. Sizes of configurable things (0 disables) @@ -564,19 +564,19 @@ defconfig -- This is a configuration file similar to the Linux Filesystem configuration CONFIG_FS_FAT - Enable FAT filesystem support CONFIG_FAT_SECTORSIZE - Max supported sector size - CONFIG_FAT_LCNAMES - Enable use of the NT-style upper/lower case 8.3 - file name support. + CONFIG_FAT_LCNAMES - Enable use of the NT-style upper/lower case 8.3 + file name support. CONFIG_FAT_LFN - Enable FAT long file names. NOTE: Microsoft claims - patents on FAT long file name technology. Please read the - disclaimer in the top-level COPYING file and only enable this - feature if you understand these issues. - CONFIG_FAT_MAXFNAME - If CONFIG_FAT_LFN is defined, then the - default, maximum long file name is 255 bytes. This can eat up - a lot of memory (especially stack space). If you are willing - to live with some non-standard, short long file names, then - define this value. A good choice would be the same value as - selected for CONFIG_NAME_MAX which will limit the visibility - of longer file names anyway. + patents on FAT long file name technology. Please read the + disclaimer in the top-level COPYING file and only enable this + feature if you understand these issues. + CONFIG_FAT_MAXFNAME - If CONFIG_FAT_LFN is defined, then the + default, maximum long file name is 255 bytes. This can eat up + a lot of memory (especially stack space). If you are willing + to live with some non-standard, short long file names, then + define this value. A good choice would be the same value as + selected for CONFIG_NAME_MAX which will limit the visibility + of longer file names anyway. CONFIG_FS_NXFFS: Enable NuttX FLASH file system (NXFF) support. CONFIG_NXFFS_ERASEDSTATE: The erased state of FLASH. This must have one of the values of 0xff or 0x00. @@ -671,6 +671,18 @@ defconfig -- This is a configuration file similar to the Linux meaning to the driver. Board-specific logic may place restrictions on this value. + Input Devices + + CONFIG_INPUT + Enables general support for input devices + CONFIG_INPUT_TSC2007 + If CONFIG_INPUT is selected, then this setting will enable building + of the TI TSC2007 touchscreen driver. + CONFIG_TSC2007_MULTIPLE + Normally only a single TI TSC2007 touchscreen is used. But if + there are multiple TSC2007 touchscreens, this setting will enable + multiple touchscreens with the same driver. + ENC28J60 Ethernet Driver Configuration Settings: CONFIG_NET_ENC28J60 - Enabled ENC28J60 support CONFIG_ENC28J60_SPIMODE - Controls the SPI mode @@ -886,6 +898,7 @@ defconfig -- This is a configuration file similar to the Linux and CONFIG_SCHED_WORKQUEUE=y USB serial device class driver + CONFIG_USBSER Enable compilation of the USB serial driver CONFIG_USBSER_EPINTIN @@ -907,6 +920,7 @@ defconfig -- This is a configuration file similar to the Linux Size of the serial receive/transmit buffers USB Storage Device Configuration + CONFIG_USBSTRG Enable compilation of the USB storage driver CONFIG_USBSTRG_EP0MAXPACKET @@ -954,6 +968,12 @@ defconfig -- This is a configuration file similar to the Linux device. CONFIG_LCD_MAXCONTRAST - The maximum contrast value for an LCD device. + CONFIG_LCD_LANDSCAPE, CONFIG_LCD_PORTRAIT, CONFIG_LCD_RLANDSCAPE, + and CONFIG_LCD_RPORTRAIT - Some LCD drivers may support + these options to present the display in landscape, portrait, + reverse landscape, or reverse portrait orientations. Check + the README.txt file in each board configuration directory to + see if any of these are supported by the board LCD logic. CONFIG_NX_MOUSE Build in support for mouse input. CONFIG_NX_KBD |