diff options
Diffstat (limited to 'tmk_core/protocol/arm_atsam/adc.c')
| -rw-r--r-- | tmk_core/protocol/arm_atsam/adc.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/tmk_core/protocol/arm_atsam/adc.c b/tmk_core/protocol/arm_atsam/adc.c new file mode 100644 index 000000000..ab77f9240 --- /dev/null +++ b/tmk_core/protocol/arm_atsam/adc.c @@ -0,0 +1,99 @@ +/* +Copyright 2018 Massdrop Inc. + +This program is free software: you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation, either version 2 of the License, or +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include "arm_atsam_protocol.h" + +uint16_t v_5v; +uint16_t v_5v_avg; +uint16_t v_con_1; +uint16_t v_con_2; +uint16_t v_con_1_boot; +uint16_t v_con_2_boot; + +void ADC0_clock_init(void) +{ + DBGC(DC_ADC0_CLOCK_INIT_BEGIN); + + MCLK->APBDMASK.bit.ADC0_ = 1; //ADC0 Clock Enable + + GCLK->PCHCTRL[ADC0_GCLK_ID].bit.GEN = GEN_OSC0; //Select generator clock + GCLK->PCHCTRL[ADC0_GCLK_ID].bit.CHEN = 1; //Enable peripheral clock + + DBGC(DC_ADC0_CLOCK_INIT_COMPLETE); +} + +void ADC0_init(void) +{ + DBGC(DC_ADC0_INIT_BEGIN); + + //MCU + PORT->Group[1].DIRCLR.reg = 1 << 0; //PB00 as input 5V + PORT->Group[1].DIRCLR.reg = 1 << 1; //PB01 as input CON2 + PORT->Group[1].DIRCLR.reg = 1 << 2; //PB02 as input CON1 + PORT->Group[1].PMUX[0].bit.PMUXE = 1; //PB00 mux select B ADC 5V + PORT->Group[1].PMUX[0].bit.PMUXO = 1; //PB01 mux select B ADC CON2 + PORT->Group[1].PMUX[1].bit.PMUXE = 1; //PB02 mux select B ADC CON1 + PORT->Group[1].PINCFG[0].bit.PMUXEN = 1; //PB01 mux ADC Enable 5V + PORT->Group[1].PINCFG[1].bit.PMUXEN = 1; //PB01 mux ADC Enable CON2 + PORT->Group[1].PINCFG[2].bit.PMUXEN = 1; //PB02 mux ADC Enable CON1 + + //ADC + ADC0->CTRLA.bit.SWRST = 1; + while (ADC0->SYNCBUSY.bit.SWRST) { DBGC(DC_ADC0_SWRST_SYNCING_1); } + while (ADC0->CTRLA.bit.SWRST) { DBGC(DC_ADC0_SWRST_SYNCING_2); } + + //Clock divide + ADC0->CTRLA.bit.PRESCALER = ADC_CTRLA_PRESCALER_DIV2_Val; + + //Averaging + ADC0->AVGCTRL.bit.SAMPLENUM = ADC_AVGCTRL_SAMPLENUM_4_Val; + while (ADC0->SYNCBUSY.bit.AVGCTRL) { DBGC(DC_ADC0_AVGCTRL_SYNCING_1); } + if (ADC0->AVGCTRL.bit.SAMPLENUM == ADC_AVGCTRL_SAMPLENUM_1_Val) ADC0->AVGCTRL.bit.ADJRES = 0; + else if (ADC0->AVGCTRL.bit.SAMPLENUM == ADC_AVGCTRL_SAMPLENUM_2_Val) ADC0->AVGCTRL.bit.ADJRES = 1; + else if (ADC0->AVGCTRL.bit.SAMPLENUM == ADC_AVGCTRL_SAMPLENUM_4_Val) ADC0->AVGCTRL.bit.ADJRES = 2; + else if (ADC0->AVGCTRL.bit.SAMPLENUM == ADC_AVGCTRL_SAMPLENUM_8_Val) ADC0->AVGCTRL.bit.ADJRES = 3; + else ADC0->AVGCTRL.bit.ADJRES = 4; + while (ADC0->SYNCBUSY.bit.AVGCTRL) { DBGC(DC_ADC0_AVGCTRL_SYNCING_2); } + + //Settling + ADC0->SAMPCTRL.bit.SAMPLEN = 45; //Sampling Time Length: 1-63, 1 ADC CLK per + while (ADC0->SYNCBUSY.bit.SAMPCTRL) { DBGC(DC_ADC0_SAMPCTRL_SYNCING_1); } + + //Load factory calibration data + ADC0->CALIB.bit.BIASCOMP = (ADC0_FUSES_BIASCOMP_ADDR >> ADC0_FUSES_BIASCOMP_Pos) & ADC0_FUSES_BIASCOMP_Msk; + ADC0->CALIB.bit.BIASR2R = (ADC0_FUSES_BIASR2R_ADDR >> ADC0_FUSES_BIASR2R_Pos) & ADC0_FUSES_BIASR2R_Msk; + ADC0->CALIB.bit.BIASREFBUF = (ADC0_FUSES_BIASREFBUF_ADDR >> ADC0_FUSES_BIASREFBUF_Pos) & ADC0_FUSES_BIASREFBUF_Msk; + + //Enable + ADC0->CTRLA.bit.ENABLE = 1; + while (ADC0->SYNCBUSY.bit.ENABLE) { DBGC(DC_ADC0_ENABLE_SYNCING_1); } + + DBGC(DC_ADC0_INIT_COMPLETE); +} + +uint16_t adc_get(uint8_t muxpos) +{ + ADC0->INPUTCTRL.bit.MUXPOS = muxpos; + while (ADC0->SYNCBUSY.bit.INPUTCTRL) {} + + ADC0->SWTRIG.bit.START = 1; + while (ADC0->SYNCBUSY.bit.SWTRIG) {} + while (!ADC0->INTFLAG.bit.RESRDY) {} + + return ADC0->RESULT.reg; +} + |