From ebaa90d64845a5c9a0fd0221128ac0f0c177cdae Mon Sep 17 00:00:00 2001
From: essemi-yuzr <yuzr@essemi.com>
Date: Fri, 22 Nov 2019 16:06:37 +0800
Subject: [PATCH] Add ADC drivers

---
 bsp/essemi/es32f0271/drivers/drv_adc.c | 148 +++++++++++++++++++++++++
 bsp/essemi/es32f0271/drivers/drv_adc.h |  16 +++
 2 files changed, 164 insertions(+)
 create mode 100644 bsp/essemi/es32f0271/drivers/drv_adc.c
 create mode 100644 bsp/essemi/es32f0271/drivers/drv_adc.h

diff --git a/bsp/essemi/es32f0271/drivers/drv_adc.c b/bsp/essemi/es32f0271/drivers/drv_adc.c
new file mode 100644
index 0000000000..d111b54f22
--- /dev/null
+++ b/bsp/essemi/es32f0271/drivers/drv_adc.c
@@ -0,0 +1,148 @@
+/*
+ * Copyright (C) 2018 Shanghai Eastsoft Microelectronics Co., Ltd.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author        Notes
+ * 2019-10-23     yuzrain       the first version
+ */
+
+#include <rthw.h>
+#include <rtthread.h>
+#include <rtdevice.h>
+#include "board.h"
+#include "drv_adc.h"
+#include "md_gpio.h"
+#include "md_adc.h"
+#include "md_rcu.h"
+#include "md_syscfg.h"
+
+#ifdef RT_USING_ADC
+
+#define BSP_ADC_CHANNEL_NUM 8
+
+/* define adc instance */
+static struct rt_adc_device _device_adc0;
+
+/* enable or disable adc */
+static rt_err_t es32f0_adc_enabled(struct rt_adc_device *device, rt_uint32_t channel, rt_bool_t enabled)
+{
+    RT_ASSERT(device != RT_NULL);
+
+    if (enabled)
+    {
+        md_adc_enable_ssen_ss0en(ADC);
+    }
+    else
+    {
+        md_adc_disable_ssen_ss0en(ADC);
+    }
+
+    return RT_EOK;
+}
+
+static void _adc_channel_config(rt_uint32_t channel)
+{
+    /* select gpio pin as adc function */
+    switch (channel)
+    {
+    case  0:
+        md_gpio_set_mode(GPIOA, MD_GPIO_PIN_0, MD_GPIO_MODE_ANALOG);
+        break;
+    case  1:
+        md_gpio_set_mode(GPIOA, MD_GPIO_PIN_1, MD_GPIO_MODE_ANALOG);
+        break;
+    case  2:
+        md_gpio_set_mode(GPIOA, MD_GPIO_PIN_2, MD_GPIO_MODE_ANALOG);
+        break;
+    case  3:
+        md_gpio_set_mode(GPIOA, MD_GPIO_PIN_3, MD_GPIO_MODE_ANALOG);
+        break;
+    case  4:
+        md_gpio_set_mode(GPIOA, MD_GPIO_PIN_4, MD_GPIO_MODE_ANALOG);
+        break;
+    case  5:
+        md_gpio_set_mode(GPIOA, MD_GPIO_PIN_5, MD_GPIO_MODE_ANALOG);
+        break;
+    case  6:
+        md_gpio_set_mode(GPIOA, MD_GPIO_PIN_6, MD_GPIO_MODE_ANALOG);
+        break;
+    case  7:
+        md_gpio_set_mode(GPIOA, MD_GPIO_PIN_7, MD_GPIO_MODE_ANALOG);
+        break;
+    default:
+        break;
+    }
+}
+
+static rt_err_t es32f0_get_adc_value(struct rt_adc_device *device, rt_uint32_t channel, rt_uint32_t *value)
+{
+    rt_uint32_t chn_data[BSP_ADC_CHANNEL_NUM];
+    rt_uint32_t i;
+
+    RT_ASSERT(device != RT_NULL);
+    RT_ASSERT(value != RT_NULL);
+
+    /* config adc channel */
+    _adc_channel_config(channel);
+
+    md_adc_set_swtri_ss0(ADC);
+
+    while ((ADC->RIF & ADC_RIF_SS0RIF_MSK) == 0);
+
+    for (i=0; i<BSP_ADC_CHANNEL_NUM; i++)
+        chn_data[i] = md_adc_get_ss0_data(ADC);
+
+    *value = chn_data[channel];
+
+    return RT_EOK;
+}
+
+static const struct rt_adc_ops es32f0_adc_ops =
+{
+    es32f0_adc_enabled,
+    es32f0_get_adc_value,
+};
+
+int rt_hw_adc_init(void)
+{
+    int result = RT_EOK;
+
+    md_rcu_enable_apb2en_adcen(RCU);
+
+    md_syscfg_enable_cfg_currgen(SYSCFG);
+    md_syscfg_enable_cfg_vrefen(SYSCFG);
+    md_syscfg_set_cfg_vlrs(SYSCFG, 7);
+
+    md_adc_set_ss0_con_sel(ADC, MD_ADC_SS_CON_SEL_SW);
+    md_adc_set_ss0_con_type(ADC, MD_ADC_SS_CON_TYPE_EDGE);
+    md_adc_set_frf_ffrst(ADC);
+    md_adc_set_ss0_mux0_mux7(ADC, MD_ADC_SS_MUX_ADIN7);
+    md_adc_set_ss0_mux0_mux6(ADC, MD_ADC_SS_MUX_ADIN6);
+    md_adc_set_ss0_mux0_mux5(ADC, MD_ADC_SS_MUX_ADIN5);
+    md_adc_set_ss0_mux0_mux4(ADC, MD_ADC_SS_MUX_ADIN4);
+    md_adc_set_ss0_mux0_mux3(ADC, MD_ADC_SS_MUX_ADIN3);
+    md_adc_set_ss0_mux0_mux2(ADC, MD_ADC_SS_MUX_ADIN2);
+    md_adc_set_ss0_mux0_mux1(ADC, MD_ADC_SS_MUX_ADIN1);
+    md_adc_set_ss0_mux0_mux0(ADC, MD_ADC_SS_MUX_ADIN0);
+    md_adc_enable_ier_ss0ie(ADC);
+    md_adc_set_ss0_end_end(ADC, 7);
+    md_adc_enable_ss0_end_ie7(ADC);
+    md_adc_set_gainl_ch7pga(ADC, MD_ADC_GAIN_CHPGA_X2);
+    md_adc_set_gainl_ch6pga(ADC, MD_ADC_GAIN_CHPGA_X2);
+    md_adc_set_gainl_ch5pga(ADC, MD_ADC_GAIN_CHPGA_X2);
+    md_adc_set_gainl_ch4pga(ADC, MD_ADC_GAIN_CHPGA_X2);
+    md_adc_set_gainl_ch3pga(ADC, MD_ADC_GAIN_CHPGA_X2);
+    md_adc_set_gainl_ch2pga(ADC, MD_ADC_GAIN_CHPGA_X2);
+    md_adc_set_gainl_ch1pga(ADC, MD_ADC_GAIN_CHPGA_X2);
+    md_adc_set_gainl_ch0pga(ADC, MD_ADC_GAIN_CHPGA_X2);
+    md_adc_set_srate(ADC, MD_ADC_SRATE_CLKDIV1 | ADC_SRATE_CKEN_MSK);
+
+    rt_hw_adc_register(&_device_adc0, "adc0", &es32f0_adc_ops, ADC);
+
+    return result;
+}
+INIT_BOARD_EXPORT(rt_hw_adc_init);
+
+#endif
diff --git a/bsp/essemi/es32f0271/drivers/drv_adc.h b/bsp/essemi/es32f0271/drivers/drv_adc.h
new file mode 100644
index 0000000000..c97e94efea
--- /dev/null
+++ b/bsp/essemi/es32f0271/drivers/drv_adc.h
@@ -0,0 +1,16 @@
+/*
+ * Copyright (C) 2018 Shanghai Eastsoft Microelectronics Co., Ltd.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author        Notes
+ * 2019-10-23     yuzrain       the first version
+ */
+
+#ifndef DRV_ADC_H__
+#define DRV_ADC_H__
+
+int rt_hw_adc_init(void);
+
+#endif