ADC
ADC HAL provides basic APIs for accessing ADC peripheral registers. Main features include:
Support up to 8 ADC channels.
10-bit data (A0), 12-bit data (PRO).
DMA support.
Using ADC HAL Driver
ADC supports 8 channels, with each bit change corresponding to approximately 1 millivolt, requiring individual calibration for each chip. Test range: 0~ 1.1V on A0, 0 ~ 3.3V on PRO.
Example of using ADC HAL in polling mode:
ADC_HandleTypeDef hadc;
uint32_t channel, value, timeout;
ADC_ChannelConfTypeDef ADC_ChanConf;
/* initial handle */
hadc.Instance = hwp_gpadc1;
#ifndef SF32LB55X
hadc.Init.data_samp_delay = 2;
hadc.Init.conv_width = 24;
hadc.Init.sample_width = 22;
#else
hadc.Init.clk_div = 31; // set frequency
#endif
hadc.Init.adc_se = 1; // single channel
hadc.Init.adc_force_on = 0;
hadc.Init.dma_en = 0; // no dma
hadc.Init.en_slot = 0; // default slot, update by enable and configure
hadc.Init.op_mode = 0; // single mode, not continous
/* initial ADC controller */
ret = HAL_ADC_Init(&hadc);
/* enable ADC */
channel = 1;
HAL_ADC_EnableSlot(&hadc, channel, 1);
/* configure ADC */
rt_memset(&ADC_ChanConf, 0, sizeof(ADC_ChanConf));
ADC_ChanConf.Channel = channel;
ADC_ChanConf.pchnl_sel = channel;
ADC_ChanConf.slot_en = 1;
HAL_ADC_ConfigChannel(&hadc, &ADC_ChanConf);
/* start ADC */
HAL_ADC_Start(&hadc);
/* Wait for the ADC to convert */
timeout = 100; // 100 ms
HAL_ADC_PollForConversion(&hadc, tmieout);
/* Get ADC value */
value = (rt_uint32_t)HAL_ADC_GetValue(&hadc, channel);
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