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79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
/*
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* Copyright (C) 2023 Gunar Schorcht
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup cpu_gd32v
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* @ingroup drivers_periph_dac
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* @{
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*
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* @file
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* @brief Low-level DAC driver implementation for GD32VF103
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*
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* @author Gunar Schorcht <gunar@schorcht.net>
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*
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* @}
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*/
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#include "assert.h"
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#include "cpu.h"
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#include "periph/dac.h"
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#define DAC_CTL_DENX_MASK (DAC_CTL_DEN0_Msk | DAC_CTL_DEN1_Msk)
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int8_t dac_init(dac_t line)
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{
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assert(line < DAC_NUMOF);
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gpio_init_analog(dac_config[line].pin);
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dac_poweron(line);
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dac_set(line, 0);
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return DAC_OK;
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}
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void dac_set(dac_t line, uint16_t value)
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{
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assert(line < DAC_NUMOF);
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assert(dac_config[line].chan < DAC_CHANNEL_NUMOF);
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/* set the upper 12 bit of the left aligned DAC data holding register */
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if (dac_config[line].chan) {
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DAC->DAC1_L12DH = value & 0xfff0;
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}
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else {
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DAC->DAC0_L12DH = value & 0xfff0;
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}
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}
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void dac_poweron(dac_t line)
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{
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assert(line < DAC_NUMOF);
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assert(dac_config[line].chan < DAC_CHANNEL_NUMOF);
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/* enable the DAC clock */
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periph_clk_en(APB1, RCU_APB1EN_DACEN_Msk);
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/* enable the DAC channel */
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DAC->CTL |= (dac_config[line].chan) ? DAC_CTL_DEN1_Msk : DAC_CTL_DEN0_Msk;
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}
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void dac_poweroff(dac_t line)
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{
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assert(line < DAC_NUMOF);
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assert(dac_config[line].chan < DAC_CHANNEL_NUMOF);
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/* disable the DAC channel */
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DAC->CTL &= ~((dac_config[line].chan) ? DAC_CTL_DEN1_Msk : DAC_CTL_DEN0_Msk);
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if ((DAC->CTL & DAC_CTL_DENX_MASK) == 0) {
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/* disable the DAC clock only if both channels are disabled */
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periph_clk_dis(APB1, RCU_APB1EN_DACEN_Msk);
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}
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}
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