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bsp: k230: support adc
Signed-off-by: Chen Wang <[email protected]>
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‎bsp/k230/.config‎

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@@ -1490,6 +1490,7 @@ CONFIG_PKG_ZLIB_VER="latest"
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#
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# Drivers Configuration
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#
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# CONFIG_BSP_USING_ADC is not set
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CONFIG_BSP_USING_HARDLOCK=y
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CONFIG_BSP_USING_SDIO=y
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CONFIG_BSP_USING_SDIO0=y

‎bsp/k230/board/Kconfig‎

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menu "Drivers Configuration"
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config BSP_USING_ADC
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bool "Enable ADC"
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select RT_USING_ADC
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default n
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config BSP_USING_HARDLOCK
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bool "Enable Hard-Lock"
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default y

‎bsp/k230/drivers/interdrv/adc/SConscript‎

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# RT-Thread building script for component
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from building import *
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cwd = GetCurrentDir()
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src = Glob('*.c')
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CPPPATH = [cwd]
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group = DefineGroup('ADC', src, depend = ['BSP_USING_ADC'], CPPPATH = CPPPATH)
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Return('group')

‎bsp/k230/drivers/interdrv/adc/drv_adc.c‎

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/* Copyright (c) 2023, Canaan Bright Sight Co., Ltd
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 2006-2025 RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <drivers/adc.h>
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#include <ioremap.h>
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#include <rtthread.h>
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#include <rthw.h>
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#include <rtdevice.h>
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#include <riscv_io.h>
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#include <string.h>
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#include "board.h"
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#include "drv_adc.h"
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struct k230_adc adc_dev;
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static int k230_adc_hw_init(struct k230_adc_regs *adc_regs)
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{
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rt_uint32_t reg;
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reg = readl(&adc_regs->trim_reg);
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reg &= (~(0x1));
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writel(reg, &adc_regs->trim_reg);
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reg = readl(&adc_regs->trim_reg);
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reg |= 0x1;
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writel(reg, &adc_regs->trim_reg);
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reg = readl(&adc_regs->trim_reg);
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reg |= (0x1 << 20);
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writel(reg, &adc_regs->trim_reg);
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/* delay 150us */
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rt_hw_us_delay(150);
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reg &= ~(0x1 << 20);
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writel(reg, &adc_regs->trim_reg);
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writel(0x0, &adc_regs->mode_reg);
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return RT_EOK;
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}
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static int k230_adc_init()
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{
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int i;
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adc_dev.adc_regs = (struct k230_adc_regs*)rt_ioremap((void *)ADC_BASE_ADDR, ADC_IO_SIZE);
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for (i = 0; i < ADC_MAX_DMA_CHN; i++)
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{
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adc_dev.chn[i].chn_num = i;
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adc_dev.chn[i].enabled = 0;
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}
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k230_adc_hw_init(adc_dev.adc_regs);
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return RT_EOK;
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}
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static int k_adc_drv_enabled(struct k230_adc_regs *adc_regs)
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{
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rt_uint32_t reg;
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reg = readl(&adc_regs->trim_reg);
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reg |= 0x1;
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writel(reg, &adc_regs->trim_reg);
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return RT_EOK;
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}
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static int k_adc_drv_disabled(struct k230_adc_regs *adc_regs)
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{
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rt_uint32_t reg;
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reg = readl(&adc_regs->trim_reg);
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reg = reg & (~(0x1));
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writel(reg, &adc_regs->trim_reg);
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return RT_EOK;
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}
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rt_err_t k230_adc_enabled(struct rt_adc_device *device, rt_int8_t channel, rt_bool_t enabled)
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{
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if (channel >= ADC_MAX_CHANNEL)
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return -RT_ERROR;
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struct k230_adc *kd_adc = rt_container_of(device, struct k230_adc, dev);
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kd_adc->chn[channel].enabled = 1;
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if (enabled)
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{
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kd_adc->chn[channel].enabled = 1;
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}
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else
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{
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kd_adc->chn[channel].enabled = 0;
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}
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return RT_EOK;
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}
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rt_err_t k230_get_adc_value(struct rt_adc_device *device, rt_int8_t channel, rt_uint32_t *value)
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{
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if (channel >= ADC_MAX_CHANNEL)
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return -RT_ERROR;
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struct k230_adc *kd_adc = rt_container_of(device, struct k230_adc, dev);
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if (!kd_adc->chn[channel].enabled)
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return -RT_ERROR;
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writel(channel | 0x10, &kd_adc->adc_regs->cfg_reg);
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while ((readl(&kd_adc->adc_regs->cfg_reg) & 0x10000) == 0);
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*value = readl(&kd_adc->adc_regs->data_reg[channel]);
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return RT_EOK;
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}
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static const struct rt_adc_ops k230_adc_ops =
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{
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.enabled = k230_adc_enabled,
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.convert = k230_get_adc_value,
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};
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int rt_hw_adc_init(void)
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{
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k230_adc_init();
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rt_hw_adc_register(&adc_dev.dev, K230_ADC_NAME, &k230_adc_ops, NULL);
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return RT_EOK;
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}
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INIT_BOARD_EXPORT(rt_hw_adc_init);

‎bsp/k230/drivers/interdrv/adc/drv_adc.h‎

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/* Copyright (c) 2023, Canaan Bright Sight Co., Ltd
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 2006-2025 RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef __DRV_ADC__
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#define __DRV_ADC__
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#include "board.h"
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#define K230_ADC_NAME "adc"
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#define ADC_MAX_CHANNEL 6
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#define ADC_MAX_DMA_CHN 3
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struct k230_adc_regs
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{
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rt_uint32_t trim_reg; /**< 0x00 */
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rt_uint32_t cfg_reg; /**< 0x04 */
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rt_uint32_t mode_reg; /**< 0x08 */
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rt_uint32_t thsd_reg; /**< 0x0c */
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rt_uint32_t dma_intr_reg; /**< 0x10 */
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rt_uint32_t data_reg[ADC_MAX_CHANNEL]; /**< 0x14~0x28 */
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rt_uint32_t data_dma[ADC_MAX_DMA_CHN]; /**< 0x2c~0x34 */
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};
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struct k230_adc_chan
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{
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rt_uint32_t chn_num;
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rt_int8_t enabled;
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};
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struct k230_adc
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{
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struct rt_adc_device dev;
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struct k230_adc_regs *adc_regs;
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struct k230_adc_chan chn[ADC_MAX_CHANNEL];
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};
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#endif /*__DRV_ADC__*/

‎bsp/k230/drivers/utest/SConscript‎

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@@ -6,6 +6,9 @@ if GetDepend('RT_UTEST_USING_ALL_CASES') or GetDepend('BSP_UTEST_DRIVERS'):
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src += ['test_gpio.c']
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src += ['test_gpio_irq.c']
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if GetDepend('BSP_USING_ADC'):
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src += ['test_adc.c']
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if GetDepend('BSP_USING_TIMERS'):
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src += ['test_timer.c']
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‎bsp/k230/drivers/utest/test_adc.c‎

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/* Copyright 2020 Canaan Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <rtthread.h>
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#include <rtdevice.h>
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#include <stdlib.h>
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#include "../interdrv/adc/drv_adc.h"
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#include "utest.h"
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/*
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* 测试 ADC 驱动的读操作
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* 1. 查找 ADC 设备。
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* 2. 启用 ADC 设备。
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* 3. 启用每个 ADC 通道并读取其值。
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* 4. 验证读取的值在预期范围内。
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* 5. 禁用每个 ADC 通道并验证读取值为 0。
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*
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* 本测试基于 01Studio 开发板，该开发板自带排针，并引出 SoC 的以下 4 个 ADC 通道
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* 板级排针编号 | SoC 的 ADC 通道编号 | 输入电压范围
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* -------------+---------------------+-------------
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* 32 | ADC0 | (0 ~ 3.6V)
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* 36 | ADC1 | (0 ~ 3.6V)
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* 38 | ADC2 | (0 ~ 1.8V)
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* 40 | ADC3 | (0 ~ 1.8V)
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* SoC 的 ADC 通道默认只支持最大 1.8V 的输入电压，对于 ADC0 和 ADC1 通道，开发板
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* 通过增加功放将最大支持电压提升到 3.6V（而且同样采用了分压机制，导致实际 ADC
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* 通道的输入电压只有板级排针电压的一半）。
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*
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* 测试时注意连接输入的最大电压不要超过额定值，否则可能会损坏 ADC 通道。
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*
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* 另外注意这个adc 只有 12bit，所以读取的值范围是 0 ~ 4095
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*
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* 具体测试最大 1.8V 的 ADC 通道（譬如 38/40）时，可以自己通过两个 10K 欧姆的电
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* 阻将模拟输入从 3.3V 分压（将可调电阻调制最大时万用表实测 A 点电压为 1.69V 左右）：
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* +----------+ +---------------+
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* 3.3V ----| 10K 欧姆 |----| 可调 10K 欧姆 |---- 接地
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* +----------+ +---------------+
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* A
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* |
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* ADC2/ADC3
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*
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* 具体测试最大 3.6V 的 ADC 通道（譬如 32/36）时，可以直接引入 3.3V。
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* +---------------+
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* 3.3V --------------------| 可调 10K 欧姆 |---- 接地
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* +---------------+
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* A
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* |
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* ADC0/ADC1
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*/
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static void test_read(void)
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{
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int i;
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rt_err_t ret = RT_EOK;
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rt_uint32_t value, vol;
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rt_adc_device_t adc_dev;
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adc_dev = (rt_adc_device_t)rt_device_find(K230_ADC_NAME);
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uassert_not_null(adc_dev);
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ret = rt_adc_enable(adc_dev, 0);
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uassert_int_equal(ret, RT_EOK);
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for (i = 0; i < 4; i++)
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{
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ret = rt_adc_enable(adc_dev, i);
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uassert_int_equal(ret, RT_EOK);
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value = rt_adc_read(adc_dev, i);
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/* 转换为对应电压值,对应 12 位 ADC 最大值 4095, 内部基准最大电压值 1.8V，数据精度乘以 100 保留 2 位小数 */
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vol = value * 180 / 4095;
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if (i == 0 || i == 1)
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vol = vol * 2; /* ADC0/ADC1 分压后实际电压是输入电压的二分之一 */
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LOG_I("ADC chan[%d] read value: %d, calculated voltage is: %d.%02dV\n",
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i, value, vol / 100, vol % 100);
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}
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for (i = 0; i < ADC_MAX_CHANNEL; i++)
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{
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ret = rt_adc_disable(adc_dev, i);
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uassert_int_equal(ret, RT_EOK);
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value = rt_adc_read(adc_dev, i);
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uassert_int_equal(value, 0);
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}
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return;
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}
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static rt_err_t utest_tc_init(void)
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{
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return RT_EOK;
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}
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static rt_err_t utest_tc_cleanup(void)
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{
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return RT_EOK;
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}
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static void testcase(void)
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{
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UTEST_UNIT_RUN(test_read);
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}
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UTEST_TC_EXPORT(testcase, "adc", utest_tc_init, utest_tc_cleanup, 100);

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