/* * Copyright (c) 2006-2022, RT-Thread Development Team * * SPDX-License-Identifier: Apache-2.0 * * Change Logs: * Date Author Notes * 2018-05-07 aozima the first version * 2018-11-16 Ernest Chen add finsh command and update adc function * 2022-05-11 Stanley Lwin add finsh voltage conversion command */ #include #include #include #include #define DBG_TAG "adc" #define DBG_LVL DBG_INFO #include static rt_ssize_t _adc_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size) { rt_err_t result = RT_EOK; rt_size_t i; struct rt_adc_device *adc = (struct rt_adc_device *)dev; rt_uint32_t *value = (rt_uint32_t *)buffer; for (i = 0; i < size; i += sizeof(int)) { result = adc->ops->convert(adc, pos + i, value); if (result != RT_EOK) { return 0; } value++; } return i; } static rt_err_t _adc_control(rt_device_t dev, int cmd, void *args) { rt_err_t result = -RT_EINVAL; rt_adc_device_t adc = (struct rt_adc_device *)dev; if (cmd == RT_ADC_CMD_ENABLE && adc->ops->enabled) { result = adc->ops->enabled(adc, (rt_uint32_t)args, RT_TRUE); } else if (cmd == RT_ADC_CMD_DISABLE && adc->ops->enabled) { result = adc->ops->enabled(adc, (rt_uint32_t)args, RT_FALSE); } else if (cmd == RT_ADC_CMD_GET_RESOLUTION && adc->ops->get_resolution && args) { rt_uint8_t resolution = adc->ops->get_resolution(adc); if(resolution != 0) { *((rt_uint8_t*)args) = resolution; LOG_D("resolution: %d bits", resolution); result = RT_EOK; } } else if (cmd == RT_ADC_CMD_GET_VREF && adc->ops->get_vref && args) { rt_int16_t value = adc->ops->get_vref(adc); if(value != 0) { *((rt_int16_t *) args) = value; result = RT_EOK; } } return result; } #ifdef RT_USING_DEVICE_OPS const static struct rt_device_ops adc_ops = { RT_NULL, RT_NULL, RT_NULL, _adc_read, RT_NULL, _adc_control, }; #endif rt_err_t rt_hw_adc_register(rt_adc_device_t device, const char *name, const struct rt_adc_ops *ops, const void *user_data) { rt_err_t result = RT_EOK; RT_ASSERT(ops != RT_NULL && ops->convert != RT_NULL); device->parent.type = RT_Device_Class_ADC; device->parent.rx_indicate = RT_NULL; device->parent.tx_complete = RT_NULL; #ifdef RT_USING_DEVICE_OPS device->parent.ops = &adc_ops; #else device->parent.init = RT_NULL; device->parent.open = RT_NULL; device->parent.close = RT_NULL; device->parent.read = _adc_read; device->parent.write = RT_NULL; device->parent.control = _adc_control; #endif device->ops = ops; device->parent.user_data = (void *)user_data; result = rt_device_register(&device->parent, name, RT_DEVICE_FLAG_RDWR); return result; } rt_uint32_t rt_adc_read(rt_adc_device_t dev, rt_int8_t channel) { rt_uint32_t value; RT_ASSERT(dev); dev->ops->convert(dev, channel, &value); return value; } rt_err_t rt_adc_enable(rt_adc_device_t dev, rt_int8_t channel) { rt_err_t result = RT_EOK; RT_ASSERT(dev); if (dev->ops->enabled != RT_NULL) { result = dev->ops->enabled(dev, channel, RT_TRUE); } else { result = -RT_ENOSYS; } return result; } rt_err_t rt_adc_disable(rt_adc_device_t dev, rt_int8_t channel) { rt_err_t result = RT_EOK; RT_ASSERT(dev); if (dev->ops->enabled != RT_NULL) { result = dev->ops->enabled(dev, channel, RT_FALSE); } else { result = -RT_ENOSYS; } return result; } rt_int16_t rt_adc_voltage(rt_adc_device_t dev, rt_int8_t channel) { rt_uint32_t value = 0; rt_int16_t vref = 0, voltage = 0; rt_uint8_t resolution = 0; RT_ASSERT(dev); /*get the resolution in bits*/ if (_adc_control((rt_device_t) dev, RT_ADC_CMD_GET_RESOLUTION, &resolution) != RT_EOK) { goto _voltage_exit; } /*get the reference voltage*/ if (_adc_control((rt_device_t) dev, RT_ADC_CMD_GET_VREF, &vref) != RT_EOK) { goto _voltage_exit; } /*read the value and convert to voltage*/ dev->ops->convert(dev, channel, &value); voltage = value * vref / (1 << resolution); _voltage_exit: return voltage; } #ifdef RT_USING_FINSH static int adc(int argc, char **argv) { int value = 0; rt_int16_t voltage = 0; rt_err_t result = -RT_ERROR; static rt_adc_device_t adc_device = RT_NULL; char *result_str; if (argc > 1) { if (!strcmp(argv[1], "probe")) { if (argc == 3) { adc_device = (rt_adc_device_t)rt_device_find(argv[2]); result_str = (adc_device == RT_NULL) ? "failure" : "success"; rt_kprintf("probe %s %s \n", argv[2], result_str); } else { rt_kprintf("adc probe - probe adc by name\n"); } } else { if (adc_device == RT_NULL) { rt_kprintf("Please using 'adc probe ' first\n"); return -RT_ERROR; } if (!strcmp(argv[1], "enable")) { if (argc == 3) { result = rt_adc_enable(adc_device, atoi(argv[2])); result_str = (result == RT_EOK) ? "success" : "failure"; rt_kprintf("%s channel %d enables %s \n", adc_device->parent.parent.name, (rt_base_t)atoi(argv[2]), result_str); } else { rt_kprintf("adc enable - enable adc channel\n"); } } else if (!strcmp(argv[1], "read")) { if (argc == 3) { value = rt_adc_read(adc_device, atoi(argv[2])); rt_kprintf("%s channel %d read value is 0x%08X \n", adc_device->parent.parent.name, (rt_base_t)atoi(argv[2]), value); } else { rt_kprintf("adc read - read adc value on the channel\n"); } } else if (!strcmp(argv[1], "disable")) { if (argc == 3) { result = rt_adc_disable(adc_device, atoi(argv[2])); result_str = (result == RT_EOK) ? "success" : "failure"; rt_kprintf("%s channel %d disable %s \n", adc_device->parent.parent.name, (rt_base_t)atoi(argv[2]), result_str); } else { rt_kprintf("adc disable - disable adc channel\n"); } } else if (!strcmp(argv[1], "voltage")) { if(argc == 3) { voltage = rt_adc_voltage(adc_device, atoi(argv[2])); result_str = (result == RT_EOK) ? "success" : "failure"; rt_kprintf("%s channel %d voltage is %d.%03dV \n", adc_device->parent.parent.name, (rt_base_t)atoi(argv[2]), voltage / 1000, voltage % 1000); } else { rt_kprintf("adc convert voltage \n"); } } else { rt_kprintf("Unknown command. Please enter 'adc' for help\n"); } } } else { rt_kprintf("Usage: \n"); rt_kprintf("adc probe - probe adc by name\n"); rt_kprintf("adc read - read adc value on the channel\n"); rt_kprintf("adc disable - disable adc channel\n"); rt_kprintf("adc enable - enable adc channel\n"); result = -RT_ERROR; } return RT_EOK; } MSH_CMD_EXPORT(adc, adc [option]); #endif /* RT_USING_FINSH */