Renesas RX110

RX Family ADC Module Using Firmware Integration Technology
R01AN1666EJ0220 Rev. 2.20 Page 58 of 74
Dec 01, 2016
Example 2: Temperature Sensor Polling and Set Sample State Count Unit 1 (RX64M, RX71M,
RX65x)
uint16_t data;
adc_cfg_t config;
adc_sst_t sst; // sample state
adc_ch_cfg_t ch_cfg;
adc_err_t adc_err;
/* OPEN ADC */
/* Clear all fields of the adc_cfg_t structure */
memset(&config, 0, sizeof(config));
/* Open ADC for software trigger, single scan temperature sensor, and polling */
config.resolution = ADC_RESOLUTION_10_BIT;
config.trigger = ADC_TRIG_SOFTWARE;
config.priority = 0; // denotes polling
config.add_cnt = ADC_ADD_OFF;
config.alignment = ADC_ALIGN_RIGHT;
config.clearing = ADC_CLEAR_AFTER_READ_OFF;
adc_err = R_ADC_Open(1, ADC_MODE_SS_ONE_CH, &config, NULL);
/* DO SPECIAL HARDWARE CONFIGURATION */
/* Clear all fields of the adc_sst_t structure */
memset(&sst, 0, sizeof(sst));
/* Clear all fields of the adc_ch_cfg_t structure */
memset(&ch_cfg, 0, sizeof(ch_cfg));
/* Set number of sampling states for 4us sample *
/* For PCLKD=60MHz, 1 state = 1/60MHz = 16.7ns, 4us/16.7ns = 240 states */
sst.reg_id = ADC_SST_TEMPERATURE;
sst.num_states = 240;
adc_err = R_ADC_Control(1, ADC_CMD_SET_SAMPLE_STATE_CNT, &sst);
/* CONFIGURE SCAN */
ch_cfg.chan_mask = ADC_MASK_TEMP;
ch_cfg.diag_method = ADC_DIAG_OFF;
ch_cfg.anex_enable = false;
ch_cfg.sample_hold_mask = 0; // not available on unit 1
adc_err = R_ADC_Control(1, ADC_CMD_ENABLE_CHANS, &ch_cfg);
/* After open, wait 1 us or longer before A/D conversion starts */
/* CAUSE SOFTWARE TRIGGER */
adc_err = R_ADC_Control(1, ADC_CMD_SCAN_NOW, NULL);
/* WAIT FOR SCAN TO COMPLETE */
while (R_ADC_Control(1, ADC_CMD_CHECK_SCAN_DONE, NULL) == ADC_ERR_SCAN_NOT_DONE)
{
}
/* READ RESULT */
adc_err = R_ADC_Read(1, ADC_REG_TEMP, &data);