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72 lines
1.8 KiB
72 lines
1.8 KiB
/* |
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation, either version 3 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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/* |
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* AP_Common.cpp - common utility functions |
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*/ |
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#include <AP_HAL/AP_HAL.h> |
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#include "AP_Common.h" |
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extern const AP_HAL::HAL& hal; |
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/* |
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Return true if value is between lower and upper bound inclusive. |
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False otherwise. |
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*/ |
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bool is_bounded_int32(int32_t value, int32_t lower_bound, int32_t upper_bound) |
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{ |
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if ((lower_bound <= upper_bound) && |
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(value >= lower_bound) && (value <= upper_bound)) { |
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return true; |
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} |
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return false; |
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} |
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/** |
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* return the numeric value of an ascii hex character |
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* |
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* @param [in] a Hexa character |
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* @param [out] res uint8 value |
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* @retval true Conversion OK |
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* @retval false Input value error |
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* @Note Input character is 0-9, A-F, a-f |
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* A 0x41, a 0x61, 0 0x30 |
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*/ |
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bool hex_to_uint8(uint8_t a, uint8_t &res) |
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{ |
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uint8_t nibble_low = a & 0xf; |
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switch (a & 0xf0) { |
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case 0x30: // 0- |
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if (nibble_low > 9) { |
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return false; |
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} |
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res = nibble_low; |
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break; |
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case 0x40: // uppercase A- |
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case 0x60: // lowercase a- |
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if (nibble_low == 0 || nibble_low > 6) { |
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return false; |
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} |
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res = nibble_low + 9; |
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break; |
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default: |
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return false; |
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} |
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return true; |
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}
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