Add ADC support for internal TEMP/VBAT/VREF
* Add ADC support for reading internal temperature sensor. * Add ADC support for reading internal VREF/VBAT monitor.
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3591285091
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8c10240722
143
stm/adc.c
143
stm/adc.c
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@ -13,6 +13,28 @@
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#define ADCx_CLK (RCC_APB2Periph_ADC1)
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#define ADCx_CLK (RCC_APB2Periph_ADC1)
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#define ADC_NUM_CHANNELS (16)
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#define ADC_NUM_CHANNELS (16)
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/* Internally connected ADC channels Temp/VBAT/VREF*/
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#if defined (STM32F40XX) || defined(STM32F41XX)
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#define ADC_TEMP_CHANNEL (16)
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#define ADC_VBAT_CHANNEL (18)
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#define ADC_VREF_CHANNEL (17)
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#elif defined (STM32F42XX) || defined(STM32F43XX)
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#define ADC_TEMP_CHANNEL (18)
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#define ADC_VBAT_CHANNEL (18) /* same channel as TEMP */
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#define ADC_VREF_CHANNEL (17)
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#endif
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/* Core temperature sensor definitions */
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#define CORE_TEMP_V25 (943) /* (0.76v/3.3v)*(2^ADC resoultion) */
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#define CORE_TEMP_AVG_SLOPE (3) /* (2.5mv/3.3v)*(2^ADC resoultion) */
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/* VBAT divider */
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#if defined (STM32F40XX) || defined(STM32F41XX)
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#define VBAT_DIV (2)
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#elif defined (STM32F42XX) || defined(STM32F43XX)
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#define VBAT_DIV (4)
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#endif
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/* GPIO struct */
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/* GPIO struct */
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typedef struct {
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typedef struct {
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GPIO_TypeDef* port;
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GPIO_TypeDef* port;
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@ -82,6 +104,12 @@ void adc_init(uint32_t resolution) {
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/* Enable ADCx */
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/* Enable ADCx */
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ADC_Cmd(ADCx, ENABLE);
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ADC_Cmd(ADCx, ENABLE);
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/* Enable VBAT/VREF monitor */
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ADC_VBATCmd(ENABLE);
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/* Enable temperature sensor */
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ADC_TempSensorVrefintCmd(ENABLE);
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}
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}
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uint32_t adc_read_channel(int channel)
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uint32_t adc_read_channel(int channel)
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@ -93,7 +121,7 @@ uint32_t adc_read_channel(int channel)
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}
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}
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/* ADC regular channel config ADC/Channel/SEQ Rank/Sample time */
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/* ADC regular channel config ADC/Channel/SEQ Rank/Sample time */
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ADC_RegularChannelConfig(ADCx, channel, 1, ADC_SampleTime_3Cycles);
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ADC_RegularChannelConfig(ADCx, channel, 1, ADC_SampleTime_15Cycles);
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/* Start ADC single conversion */
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/* Start ADC single conversion */
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ADC_SoftwareStartConv(ADCx);
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ADC_SoftwareStartConv(ADCx);
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@ -111,6 +139,80 @@ uint32_t adc_read_channel(int channel)
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return ADC_GetConversionValue(ADCx);
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return ADC_GetConversionValue(ADCx);
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}
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}
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int adc_read_core_temp()
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{
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int timeout = 10000;
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/* ADC temperature sensor channel config ADC/Channel/SEQ Rank/Sample time */
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/* Note: sample time must be higher than minimum sample time */
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ADC_RegularChannelConfig(ADCx, ADC_TEMP_CHANNEL, 1, ADC_SampleTime_480Cycles);
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/* Start ADC single conversion */
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ADC_SoftwareStartConv(ADCx);
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/* Wait for conversion to be complete*/
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while(!ADC_GetFlagStatus(ADCx, ADC_FLAG_EOC) && --timeout >0) {
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}
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/* ADC conversion timed out */
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if (timeout == 0) {
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return 0;
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}
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/* Convert ADC reading to temperature */
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/* Temperature formula from datasheet P.411 */
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return ((ADC_GetConversionValue(ADCx) - CORE_TEMP_V25) / CORE_TEMP_AVG_SLOPE) + 25;
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}
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float adc_read_core_vbat()
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{
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int timeout = 10000;
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/* ADC VBAT channel config ADC/Channel/SEQ Rank/Sample time */
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/* Note: sample time must be higher than minimum sample time */
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ADC_RegularChannelConfig(ADCx, ADC_VBAT_CHANNEL, 1, ADC_SampleTime_144Cycles);
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/* Start ADC single conversion */
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ADC_SoftwareStartConv(ADCx);
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/* Wait for conversion to be complete */
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while(!ADC_GetFlagStatus(ADCx, ADC_FLAG_EOC) && --timeout >0) {
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}
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/* ADC conversion timed out */
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if (timeout == 0) {
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return 0;
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}
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/* Convert ADC reading to voltage, VBAT pin is
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internally connected to a bridge divider by VBAT_DIV */
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return ADC_GetConversionValue(ADCx)*VBAT_DIV/4096.0f*3.3f;
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}
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float adc_read_core_vref()
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{
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int timeout = 10000;
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/* ADC VBAT channel config ADC/Channel/SEQ Rank/Sample time */
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/* Note: sample time must be higher than minimum sample time */
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ADC_RegularChannelConfig(ADCx, ADC_VREF_CHANNEL, 1, ADC_SampleTime_112Cycles);
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/* Start ADC single conversion */
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ADC_SoftwareStartConv(ADCx);
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/* Wait for conversion to be complete*/
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while(!ADC_GetFlagStatus(ADCx, ADC_FLAG_EOC) && --timeout >0) {
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}
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/* ADC conversion timed out */
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if (timeout == 0) {
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return 0;
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}
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/* Convert ADC reading to voltage */
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return ADC_GetConversionValue(ADCx)/4096.0f*3.3f;
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}
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/******************************************************************************/
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/******************************************************************************/
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/* Micro Python bindings */
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/* Micro Python bindings */
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@ -132,15 +234,54 @@ static mp_obj_t adc_obj_read_channel(mp_obj_t self_in, mp_obj_t channel) {
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return ret;
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return ret;
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}
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}
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static mp_obj_t adc_obj_read_core_temp(mp_obj_t self_in) {
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mp_obj_t ret = mp_const_none;
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pyb_adc_obj_t *self = self_in;
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if (self->is_enabled) {
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int data = adc_read_core_temp();
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ret = mp_obj_new_int(data);
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}
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return ret;
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}
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static mp_obj_t adc_obj_read_core_vbat(mp_obj_t self_in) {
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mp_obj_t ret = mp_const_none;
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pyb_adc_obj_t *self = self_in;
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if (self->is_enabled) {
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float data = adc_read_core_vbat();
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ret = mp_obj_new_float(data);
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}
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return ret;
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}
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static mp_obj_t adc_obj_read_core_vref(mp_obj_t self_in) {
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mp_obj_t ret = mp_const_none;
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pyb_adc_obj_t *self = self_in;
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if (self->is_enabled) {
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float data = adc_read_core_vref();
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ret = mp_obj_new_float(data);
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}
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return ret;
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}
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static void adc_obj_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in) {
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static void adc_obj_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in) {
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pyb_adc_obj_t *self = self_in;
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pyb_adc_obj_t *self = self_in;
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print(env, "<ADC %lu>", self->adc_id);
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print(env, "<ADC %lu>", self->adc_id);
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}
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}
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static MP_DEFINE_CONST_FUN_OBJ_2(adc_obj_read_channel_obj, adc_obj_read_channel);
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static MP_DEFINE_CONST_FUN_OBJ_2(adc_obj_read_channel_obj, adc_obj_read_channel);
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static MP_DEFINE_CONST_FUN_OBJ_1(adc_obj_read_core_temp_obj, adc_obj_read_core_temp);
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static MP_DEFINE_CONST_FUN_OBJ_1(adc_obj_read_core_vbat_obj, adc_obj_read_core_vbat);
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static MP_DEFINE_CONST_FUN_OBJ_1(adc_obj_read_core_vref_obj, adc_obj_read_core_vref);
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static const mp_method_t adc_methods[] = {
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static const mp_method_t adc_methods[] = {
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{ "read_channel", &adc_obj_read_channel_obj},
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{ "read_channel", &adc_obj_read_channel_obj},
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{ "read_core_temp", &adc_obj_read_core_temp_obj},
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{ "read_core_vbat", &adc_obj_read_core_vbat_obj},
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{ "read_core_vref", &adc_obj_read_core_vref_obj},
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{ NULL, NULL },
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{ NULL, NULL },
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};
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};
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