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199***514
为什么下面这段代码，没有蓝牙时在GR5513上可以量出1.6V，在蓝牙时却只有1.2V ?
void adc_single(void)
{
uint16_t ret = APP_DRV_SUCCESS;
/* Please initialize DMA in the following order. */
/* Note: Initialization is not allowed during the transmission process. */
ret = app_adc_init(&adc_params, app_adc_evt_handler);
if (ret != APP_DRV_SUCCESS)
{
printf("\r\nADC initial failed! Please check the input parameters.\r\n");
return;
}
ret = app_adc_dma_init(&adc_params);
if (ret != APP_DRV_SUCCESS)
{
printf("\r\nADC initial dma failed! Please check the input parameters.\r\n");
return;
}
memset(conversion, 0, sizeof(conversion));
printf("Start single sampling.\r\n");
covn_done = 0;
app_adc_dma_conversion_async(conversion, TEST_CONV_LENGTH);
while(covn_done == 0);
app_adc_voltage_intern(conversion, voltage, TEST_CONV_LENGTH);
printf("Conversion value:\r\n");
for(uint32_t i = 0; i < TEST_CONV_LENGTH; i++)
{
printf("%0.3fV ", voltage[i]);
app_log_flush();
}
printf("\r\n");
/* Please deinitialize DMA in the following order. */
app_adc_dma_deinit();
app_adc_deinit();
}
199***514
/*
* GLOBAL VARIABLE DEFINITIONS
*****************************************************************************************
*/
volatile uint16_t covn_done = 0;
uint16_t conversion[TEST_CONV_LENGTH];
double voltage[TEST_CONV_LENGTH];
app_adc_params_t adc_params = {
.pin_cfg = {
.channel_p = {
.type = APP_IO_TYPE_MSIO,
.mux = APP_ADC_P_INPUT_PIN_MUX,
.pin = APP_ADC_P_INPUT_PIN,
},
.channel_n = {
.type = APP_IO_TYPE_MSIO,
.mux = APP_ADC_N_INPUT_PIN_MUX,
.pin = APP_ADC_N_INPUT_PIN,
},
},
.dma_cfg = {
.dma_instance = DMA0,
.dma_channel = DMA_Channel0,
},
.init = {
.channel_p = APP_ADC_P_INPUT_SRC,
.channel_n = APP_ADC_N_INPUT_SRC,
.input_mode = ADC_INPUT_SINGLE,
.ref_source = ADC_REF_SRC_BUF_INT,
.ref_value = ADC_REF_VALUE_1P6,
.clock = ADC_CLK_1M,
},
};
/*
* GLOBAL FUNCTION DEFINITIONS
****************************************************************************************
*/
void app_adc_evt_handler(app_adc_evt_t * p_evt)
{
if (p_evt->type == APP_ADC_EVT_CONV_CPLT)
{
covn_done = 1;
}
}
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