From 9439c6f1caffd938673018f3af7460b33a12528e Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Karel=20Ko=C4=8D=C3=AD?= Date: Sun, 20 Mar 2016 16:39:30 +0100 Subject: Another work progress --- docs/modules/utils/buffer.md | 105 ------------------------------------------- docs/modules/utils/narray.md | 64 -------------------------- 2 files changed, 169 deletions(-) delete mode 100644 docs/modules/utils/buffer.md delete mode 100644 docs/modules/utils/narray.md (limited to 'docs/modules/utils') diff --git a/docs/modules/utils/buffer.md b/docs/modules/utils/buffer.md deleted file mode 100644 index 4365c25..0000000 --- a/docs/modules/utils/buffer.md +++ /dev/null @@ -1,105 +0,0 @@ -buffer -====== -In whole project are used ring buffers. This is so common that handling them is -exported to separated header file. In fact it contains two implementations of -buffers. One implementation is defined using preprocessor macros. Another one is -plain C code. - -## Preprocessor implementation -Preprocessor implementation is expected to be faster and less memory intense. Also -more suitable for buffers of simple types (such us int). But this buffer has to be -defined with known size at compile time and can't be resized. All this makes it -good implementation for IO devices input and output buffers, but less for more -complicated tasks containing for example sorting. - -### Macros -#### IOEBUFFER -```C -IOEBUFFER(type, name, size) -``` -This macro defines buffer. Use it to define new buffer. -##### Parameters -| type | Specify type of elements in buffer. Can be any valid C type | -| name | Name of buffer. This is C variable name. | -| size | Numerical value of buffer size | - -#### IOEBUFFER_INIT -```C -IOEBUFFER_INIT(name, size) -``` -Use this to initialize buffer. Parameter `size` must be same as for IOEBUFFER -(definition of buffer). You can use this also to reset buffer (remove all data -from buffer). -##### Parameters -| name | Name if buffer. This is C variable name. | -| size | Numerical value of buffer size | - -#### IOEBUFFER_PUT -```C -IOEBUFFER_PUT(name, size, data, mode) -``` -Use this macro to add new data to buffer. -##### Parameters -| name | Name of buffer. This is C variable name. | -| size | Numerical value of buffer size | -| data | Data to be stored to buffer | -| mode | This specifies action if buffer is full. | -##### Modes -| IOEBUFFER_MODE_BLOCK | Block execution until buffer has some free space. | -| IOEBUFFER_MODE_OVERWRITE | Overwrites oldest added (fist to be read) | -| IOEBUFFER_MODE_DROP | New data won't be stored to buffer if full | - -#### IOEBUFFER_GET -```C -IOEBUFFER_GET(name, size, variable) -``` -Get value from buffer. Value is stored in `variable` (it is variable of same type -as buffer data, not pointer to variable of same type). If no data is in buffer, -variable is set to NULL. -##### Parameters -| name | Name of buffer. This is C variable name. | -| size | Numerical value of buffer size. | -| variable | Variable in which data will be stored in. | - -#### IOEBUFFER_CNT -```C -IOEBUFFER_CNT(name, size, variable) -``` -Counts number of data entries in buffer and saves value to variable. -##### Parameters -| name | Name of buffer. This is C variable name. | -| size | Numerical value of buffer size. | -| variable | Int/Unsigned type variable where data count will be stored. | - -## C implementation -C implementation is more general. Size is defined by calling initialization -function. But it is using general pointers, so it is only able store pointers. - -As buffer identification is used defined type `IOEBuffer`. All functions takes -pointer to this type as parameter. Because of this, it won't be described for -every function. - -### Functions -#### ioebuffer_init -```C -int8_t ioebuffer_init(IOEBuffer *buf, uint8_t size, uint8_t flags) -``` -Initialized buffer and allocates required resources. -##### Parameters -| size | Number of elements to be maximally stored in buffer | -| flags | TODO -##### Flags -TODO - -#### ioebuffer_uninit -```C -void ioebuffer_uninit(IOEBuffer *buf) -``` -Frees all resources allocated during initialization of buffer. Use this every time -you are freeing buffer. - -#### ioebuffer_put -```C -int8_t ioebuffer_put(IOEBuffer *buf, void *data) -``` -Add `data` to buffer diff --git a/docs/modules/utils/narray.md b/docs/modules/utils/narray.md deleted file mode 100644 index 3e64f67..0000000 --- a/docs/modules/utils/narray.md +++ /dev/null @@ -1,64 +0,0 @@ -narray.h -======== -This implements some helping functions for null terminated arrays. Null terminated -arrays are used across whole project because they are simple and don't waste -memory space. Their disadvantage is more complicated implementation of utility -functions and much longer adding time (they are reallocated every time new data -are added). - -This implementation is limited to only contains 255 elements(limited by uint8_t -type). But it should be enough for basic usage. If you need store more than that, -you should use different approach. Also only pointers can be stored. - -To define null terminated array just define pointer to you required pointer and set -it to NULL. Such narray is handled as empty. Example: -```C -int **narray = 0; -``` -After adding some data (in example case data of type `int*`) you can access them -same as if you would working with simple array (`narray[i]`). Last element it such -array is `NULL`. No more valid data are stored after `NULL` (This also means that -`NULL` can't be stored to narray). - -All functions are taking as parameter `void ***array`, which is pointer to null -terminated array. This parameter won't be described in functions. - -## Functions and macros -### narray_add -```C -void narray_add(void ***array, void *data) -``` -Add data to end of the array. This increases size of the array by one (two bytes). -#### Parameters -| data | data to be stored to array | - -### narray_remove -```C -void narray_remove(void ***array, void *data) -``` -Remove specified data from array. This effectively decreases size of the array by -one (two bytes). -#### Parameters -| data | data to be removed from array | - -### narray_size -```C -size_t narray_size(void ***array) -``` -Returns size of array. - -### narray_free -```C -inline void narray_free(void ***array) -``` -Frees whole array if allocated. - -### fornarray -```C -#define fornarray(array, i, data) for (i = 0; (data = array[i]) != 0; i++) -``` -This is macro. It implements simple foreach cycle. -#### Parameters -| array | array it self (void ** not pointer) | -| i | unsigned integer (uint8_t) | -| data | variable which will be used to access data | -- cgit v1.2.3