djsundog
/
circuitpython
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

nrf52/hal: Adding adce (saadc) implementation for nrf52 to sample values on a channel.

This commit is contained in:
Glenn Ruben Bakke 2017-01-15 17:51:49 +01:00
parent 63fc32e56f
commit 496de3a839
1 changed files with 80 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

82
nrf5/hal/hal_adce.c
View File

@ -23,14 +23,92 @@
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdio.h>
#include "mphalport.h"
#include "hal_adc.h"
#ifdef HAL_ADCE_MODULE_ENABLED
static const uint32_t hal_adc_input_lookup_pos[] = {
SAADC_CH_PSELP_PSELP_AnalogInput0 << SAADC_CH_PSELP_PSELP_Pos,
SAADC_CH_PSELP_PSELP_AnalogInput1 << SAADC_CH_PSELP_PSELP_Pos,
SAADC_CH_PSELP_PSELP_AnalogInput2 << SAADC_CH_PSELP_PSELP_Pos,
SAADC_CH_PSELP_PSELP_AnalogInput3 << SAADC_CH_PSELP_PSELP_Pos,
SAADC_CH_PSELP_PSELP_AnalogInput4 << SAADC_CH_PSELP_PSELP_Pos,
SAADC_CH_PSELP_PSELP_AnalogInput5 << SAADC_CH_PSELP_PSELP_Pos,
SAADC_CH_PSELP_PSELP_AnalogInput6 << SAADC_CH_PSELP_PSELP_Pos,
SAADC_CH_PSELP_PSELP_AnalogInput7 << SAADC_CH_PSELP_PSELP_Pos
};
#define HAL_ADCE_PSELP_NOT_CONNECTED (SAADC_CH_PSELP_PSELP_NC << SAADC_CH_PSELP_PSELP_Pos)
#define HAL_ADCE_PSELP_VDD (SAADC_CH_PSELP_PSELP_VDD << SAADC_CH_PSELP_PSELP_Pos)
static const uint32_t hal_adc_input_lookup_neg[] = {
SAADC_CH_PSELN_PSELN_AnalogInput0 << SAADC_CH_PSELN_PSELN_Pos,
SAADC_CH_PSELN_PSELN_AnalogInput1 << SAADC_CH_PSELN_PSELN_Pos,
SAADC_CH_PSELN_PSELN_AnalogInput2 << SAADC_CH_PSELN_PSELN_Pos,
SAADC_CH_PSELN_PSELN_AnalogInput3 << SAADC_CH_PSELN_PSELN_Pos,
SAADC_CH_PSELN_PSELN_AnalogInput4 << SAADC_CH_PSELN_PSELN_Pos,
SAADC_CH_PSELN_PSELN_AnalogInput5 << SAADC_CH_PSELN_PSELN_Pos,
SAADC_CH_PSELN_PSELN_AnalogInput6 << SAADC_CH_PSELN_PSELN_Pos,
SAADC_CH_PSELN_PSELN_AnalogInput7 << SAADC_CH_PSELN_PSELN_Pos
};
#define HAL_ADCE_PSELN_NOT_CONNECTED (SAADC_CH_PSELN_PSELN_NC << SAADC_CH_PSELN_PSELN_Pos)
#define HAL_ADCE_PSELN_VDD (SAADC_CH_PSELN_PSELN_VDD << SAADC_CH_PSELN_PSELN_Pos)
uint16_t hal_adc_channel_value(hal_adc_config_t const * p_adc_conf) {
return 0;
int16_t result = 0;
// configure to use VDD/4 and gain 1/4
ADC_BASE->CH[0].CONFIG = (SAADC_CH_CONFIG_GAIN_Gain1_4 << SAADC_CH_CONFIG_GAIN_Pos)
| (SAADC_CH_CONFIG_MODE_SE << SAADC_CH_CONFIG_MODE_Pos)
| (SAADC_CH_CONFIG_REFSEL_VDD1_4 << SAADC_CH_CONFIG_REFSEL_Pos)
| (SAADC_CH_CONFIG_RESN_Bypass << SAADC_CH_CONFIG_RESN_Pos)
| (SAADC_CH_CONFIG_RESP_Bypass << SAADC_CH_CONFIG_RESP_Pos)
| (SAADC_CH_CONFIG_TACQ_3us << SAADC_CH_CONFIG_TACQ_Pos);
// positive input
ADC_BASE->CH[0].PSELP = hal_adc_input_lookup_pos[p_adc_conf->channel]; // HAL_ADCE_PSELP_VDD;
ADC_BASE->CH[0].PSELN = HAL_ADCE_PSELN_NOT_CONNECTED;
ADC_BASE->RESOLUTION = SAADC_RESOLUTION_VAL_8bit << SAADC_RESOLUTION_VAL_Pos;
ADC_BASE->RESULT.MAXCNT = 1;
ADC_BASE->RESULT.PTR = (uint32_t)&result;
ADC_BASE->SAMPLERATE = SAADC_SAMPLERATE_MODE_Task << SAADC_SAMPLERATE_MODE_Pos;
ADC_BASE->ENABLE = SAADC_ENABLE_ENABLE_Enabled << SAADC_ENABLE_ENABLE_Pos;
// calibrate ADC
ADC_BASE->TASKS_CALIBRATEOFFSET = 1;
while (ADC_BASE->EVENTS_CALIBRATEDONE == 0) {
;
}
ADC_BASE->EVENTS_CALIBRATEDONE = 0;
while (ADC_BASE->STATUS == (SAADC_STATUS_STATUS_Busy << SAADC_STATUS_STATUS_Pos)) {
;
}
// start the ADC
ADC_BASE->TASKS_START = 1;
while (ADC_BASE->EVENTS_STARTED == 0) {
;
}
ADC_BASE->EVENTS_STARTED = 0;
// sample ADC
ADC_BASE->TASKS_SAMPLE = 1;
while (ADC_BASE->EVENTS_END == 0) {
;
}
ADC_BASE->EVENTS_END = 0;
ADC_BASE->TASKS_STOP = 1;
while (ADC_BASE->EVENTS_STOPPED == 0) {
;
}
ADC_BASE->EVENTS_STOPPED = 0;
return result;
}
uint16_t hal_adc_battery_level(void) {