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feature: custom function to get addresses

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Derisis13
2022-12-12 20:38:15 +01:00
parent 80be8de0f6
commit 067d0cf93c
3 changed files with 79 additions and 14 deletions
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58
Core/Src/main.c
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@@ -23,7 +23,7 @@
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "usbd_cdc.h"
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
@@ -48,7 +48,7 @@ SPI_HandleTypeDef hspi1;
/* USER CODE BEGIN PV */
state st = run;
uint16_t i2c_address = 0;
uint32_t i2c_address = 0;
uint32_t limit_address = 0;
/* USER CODE END PV */
@@ -66,6 +66,60 @@ extern uint8_t CDC_Transmit_FS(uint8_t *Buf, uint16_t Len);
/* USER CODE BEGIN 0 */
/* -----------------------------------------------------------------------------
* Converts a hexadecimal ASCII character to it's value
*
* From https://github.com/Sasszem/oldschool-game/blob/main/save.c
* under the conditions of the MIT License:
*
* MIT License
*
* Copyright (c) 2022 László Baráth
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
* -------------------------------------------------------------------------- */
uint8_t hex_nibble(char val) {
if ('0' <= val && val <= '9')
return val - '0';
if ('a' <= val && val <= 'f')
return val - 'a' + 10;
if ('A' <= val && val <= 'F')
return val - 'A' + 10;
return 0xFF;
}
/* -----------------------------------------------------------------------------------------
* Converts all characters until the first character that matches delim or until *Len
* Result is stored to dest
* Return value is the number of characters processed or 0 in case of a conversion failure
* ----------------------------------------------------------------------------------------- */
uint8_t homegrown_scanf (uint8_t *Buf, const uint32_t *Len, uint32_t *dest, const char delim) {
uint8_t cursor = 0;
for (*dest = 0; Buf[cursor] != delim || cursor < *Len; cursor++) {
uint8_t nibble = hex_nibble(Buf[cursor]);
if (nibble == 0xFF) {
return(0);
}
*dest = *dest * 16 + nibble;
}
return (cursor);
}
/* --------------------------------------------------------------------------
* convert a hex to ascii string
* input is a byte array (binary), output is a character array (str)
* len is the number of bytes to convert, str needs to be at least 2x as big