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stm8s_adc.c
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/*
* This file is provided under a MIT license. When using or
* redistributing this file, you may do so under either license.
*
* MIT License
*
* Copyright (c) 2020 Pavel Nadein
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* STM8S open source driver
*
* Contact Information:
* Pavel Nadein <[email protected]>
*/
#include "stm8s_adc.h"
#define ADC_ALIGN_RIGHT (uint8_t)0x08
#define ADC_STAB_TIME 100
/**
* @brief Init the ADC1 with standart right-aligned mode.
* @param ch: ADC channel ADC1_CHANNEL_0..9
* @param pr: Clock preescaller. Check manual for max frequency
* @retval None
*/
void adc_init (enum adc_channel ch, enum adc_prescaler pr)
{
CLK->PCKENR2 |= CLK_PCKENR2_ADC;
ADC1->TDRL = (u8)ch;
ADC1->CR2 = ADC_ALIGN_RIGHT;
ADC1->CR1 = (u8)pr | ADC1_CR1_ADON;
}
/**
* @brief Read the ADC1 and return the result.
* @param ch: ADC channel ADC1_CHANNEL_0..9
* @retval uint16_t: conversion result
*/
uint16_t adc_read (enum adc_channel ch)
{
union { uint8_t res8[2]; uint16_t res16; } res;
ADC1->CR1 &= ~ADC1_CR1_ADON;
ADC1->CSR = (u8)ch;
ADC1->CR1 |= ADC1_CR1_ADON;
for (res.res8[0] = 0; res.res8[0] != ADC_STAB_TIME; res.res8[0]++)
asm("nop");
ADC1->CR1 |= ADC1_CR1_ADON;
while (!(ADC1->CSR & ADC1_CSR_EOC));
res.res8[1] = ADC1->DRL;
res.res8[0] = ADC1->DRH;
ADC1->CSR &= ~ADC1_CSR_EOC;
return res.res16;
}