diff options
Diffstat (limited to 'src/stm/ao_adc_stm.c')
| -rw-r--r-- | src/stm/ao_adc_stm.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/src/stm/ao_adc_stm.c b/src/stm/ao_adc_stm.c new file mode 100644 index 00000000..1722a9ec --- /dev/null +++ b/src/stm/ao_adc_stm.c @@ -0,0 +1,225 @@ +/* + * Copyright © 2012 Keith Packard <keithp@keithp.com> + * + * 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; version 2 of the License. + * + * 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, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + */ + +#include <ao.h> + + +volatile __xdata struct ao_adc ao_adc_ring[AO_ADC_RING]; +volatile __data uint8_t ao_adc_head; +static uint8_t ao_adc_ready; + +#define AO_ADC_CR2_VAL ((0 << STM_ADC_CR2_SWSTART) | \ + (STM_ADC_CR2_EXTEN_DISABLE << STM_ADC_CR2_EXTEN) | \ + (0 << STM_ADC_CR2_EXTSEL) | \ + (0 << STM_ADC_CR2_JWSTART) | \ + (STM_ADC_CR2_JEXTEN_DISABLE << STM_ADC_CR2_JEXTEN) | \ + (0 << STM_ADC_CR2_JEXTSEL) | \ + (1 << STM_ADC_CR2_ALIGN) | \ + (0 << STM_ADC_CR2_EOCS) | \ + (1 << STM_ADC_CR2_DDS) | \ + (1 << STM_ADC_CR2_DMA) | \ + (STM_ADC_CR2_DELS_NONE << STM_ADC_CR2_DELS) | \ + (0 << STM_ADC_CR2_CONT) | \ + (1 << STM_ADC_CR2_ADON)) + +/* + * Callback from DMA ISR + * + * Mark time in ring, shut down DMA engine + */ +static void ao_adc_done(void) +{ + ao_adc_ring[ao_adc_head].tick = ao_time(); + ao_adc_head = ao_adc_ring_next(ao_adc_head); + ao_wakeup((void *) &ao_adc_head); + ao_dma_done_transfer(STM_DMA_INDEX(STM_DMA_CHANNEL_ADC1)); + ao_adc_ready = 1; +} + +/* + * Start the ADC sequence using the DMA engine + */ +void +ao_adc_poll(void) +{ + if (!ao_adc_ready) + return; + ao_adc_ready = 0; + stm_adc.sr = 0; + ao_dma_set_transfer(STM_DMA_INDEX(STM_DMA_CHANNEL_ADC1), + &stm_adc.dr, + (void *) (&ao_adc_ring[ao_adc_head].tick + 1), + AO_NUM_ADC, + (0 << STM_DMA_CCR_MEM2MEM) | + (STM_DMA_CCR_PL_HIGH << STM_DMA_CCR_PL) | + (STM_DMA_CCR_MSIZE_16 << STM_DMA_CCR_MSIZE) | + (STM_DMA_CCR_PSIZE_16 << STM_DMA_CCR_PSIZE) | + (1 << STM_DMA_CCR_MINC) | + (0 << STM_DMA_CCR_PINC) | + (0 << STM_DMA_CCR_CIRC) | + (STM_DMA_CCR_DIR_PER_TO_MEM << STM_DMA_CCR_DIR)); + ao_dma_set_isr(STM_DMA_INDEX(STM_DMA_CHANNEL_ADC1), ao_adc_done); + ao_dma_start(STM_DMA_INDEX(STM_DMA_CHANNEL_ADC1)); + + stm_adc.cr2 = AO_ADC_CR2_VAL | (1 << STM_ADC_CR2_SWSTART); +} + +/* + * Fetch a copy of the most recent ADC data + */ +void +ao_adc_get(__xdata struct ao_adc *packet) +{ + uint8_t i = ao_adc_ring_prev(ao_adc_head); + memcpy(packet, (void *) &ao_adc_ring[i], sizeof (struct ao_adc)); +} + +static void +ao_adc_dump(void) __reentrant +{ + struct ao_adc packet; + int16_t *d; + uint8_t i; + + ao_adc_get(&packet); + printf("tick: %5u", packet.tick); + d = (int16_t *) (&packet.tick + 1); + for (i = 0; i < AO_NUM_ADC; i++) + printf (" %2d: %5d", i, d[i]); + printf("\n"); +} + +__code struct ao_cmds ao_adc_cmds[] = { + { ao_adc_dump, "a\0Display current ADC values" }, + { 0, NULL }, +}; + +void +ao_adc_init(void) +{ +#ifdef AO_ADC_PIN0_PORT + stm_rcc.ahbenr |= AO_ADC_RCC_AHBENR; +#endif + +#ifdef AO_ADC_PIN0_PORT + stm_moder_set(&AO_ADC_PIN0_PORT, AO_ADC_PIN0_PIN, STM_MODER_ANALOG); +#endif +#ifdef AO_ADC_PIN1_PORT + stm_moder_set(&AO_ADC_PIN1_PORT, AO_ADC_PIN1_PIN, STM_MODER_ANALOG); +#endif +#ifdef AO_ADC_PIN2_PORT + stm_moder_set(&AO_ADC_PIN2_PORT, AO_ADC_PIN2_PIN, STM_MODER_ANALOG); +#endif +#ifdef AO_ADC_PIN3_PORT + stm_moder_set(&AO_ADC_PIN3_PORT, AO_ADC_PIN3_PIN, STM_MODER_ANALOG); +#endif +#ifdef AO_ADC_PIN4_PORT + stm_moder_set(&AO_ADC_PIN4_PORT, AO_ADC_PIN4_PIN, STM_MODER_ANALOG); +#endif +#ifdef AO_ADC_PIN5_PORT + stm_moder_set(&AO_ADC_PIN5_PORT, AO_ADC_PIN5_PIN, STM_MODER_ANALOG); +#endif +#ifdef AO_ADC_PIN6_PORT + stm_moder_set(&AO_ADC_PIN6_PORT, AO_ADC_PIN6_PIN, STM_MODER_ANALOG); +#endif +#ifdef AO_ADC_PIN7_PORT + stm_moder_set(&AO_ADC_PIN7_PORT, AO_ADC_PIN7_PIN, STM_MODER_ANALOG); +#endif +#ifdef AO_ADC_PIN8_PORT + stm_moder_set(&AO_ADC_PIN8_PORT, AO_ADC_PIN8_PIN, STM_MODER_ANALOG); +#endif +#ifdef AO_ADC_PIN9_PORT + stm_moder_set(&AO_ADC_PIN9_PORT, AO_ADC_PIN9_PIN, STM_MODER_ANALOG); +#endif + + stm_rcc.apb2enr |= (1 << STM_RCC_APB2ENR_ADC1EN); + + /* Turn off ADC during configuration */ + stm_adc.cr2 = 0; + + stm_adc.cr1 = ((0 << STM_ADC_CR1_OVRIE ) | + (STM_ADC_CR1_RES_12 << STM_ADC_CR1_RES ) | + (0 << STM_ADC_CR1_AWDEN ) | + (0 << STM_ADC_CR1_JAWDEN ) | + (0 << STM_ADC_CR1_PDI ) | + (0 << STM_ADC_CR1_PDD ) | + (0 << STM_ADC_CR1_DISCNUM ) | + (0 << STM_ADC_CR1_JDISCEN ) | + (0 << STM_ADC_CR1_DISCEN ) | + (0 << STM_ADC_CR1_JAUTO ) | + (0 << STM_ADC_CR1_AWDSGL ) | + (1 << STM_ADC_CR1_SCAN ) | + (0 << STM_ADC_CR1_JEOCIE ) | + (0 << STM_ADC_CR1_AWDIE ) | + (0 << STM_ADC_CR1_EOCIE ) | + (0 << STM_ADC_CR1_AWDCH )); + + /* 4 cycle sample time for everyone */ + stm_adc.smpr1 = 0; + stm_adc.smpr2 = 0; + stm_adc.smpr3 = 0; + + stm_adc.sqr1 = ((AO_NUM_ADC - 1) << 20); + stm_adc.sqr2 = 0; + stm_adc.sqr3 = 0; + stm_adc.sqr4 = 0; + stm_adc.sqr5 = 0; +#if AO_NUM_ADC > 0 + stm_adc.sqr5 |= (AO_ADC_SQ1 << 0); +#endif +#if AO_NUM_ADC > 1 + stm_adc.sqr5 |= (AO_ADC_SQ2 << 5); +#endif +#if AO_NUM_ADC > 2 + stm_adc.sqr5 |= (AO_ADC_SQ3 << 10); +#endif +#if AO_NUM_ADC > 3 + stm_adc.sqr5 |= (AO_ADC_SQ4 << 15); +#endif +#if AO_NUM_ADC > 4 + stm_adc.sqr5 |= (AO_ADC_SQ5 << 20); +#endif +#if AO_NUM_ADC > 5 + stm_adc.sqr5 |= (AO_ADC_SQ6 << 25); +#endif +#if AO_NUM_ADC > 6 + stm_adc.sqr4 |= (AO_ADC_SQ7 << 0); +#endif +#if AO_NUM_ADC > 7 + stm_adc.sqr4 |= (AO_ADC_SQ8 << 5); +#endif +#if AO_NUM_ADC > 8 + stm_adc.sqr4 |= (AO_ADC_SQ9 << 10); +#endif + + /* Turn ADC on */ + stm_adc.cr2 = AO_ADC_CR2_VAL; + + /* Wait for ADC to be ready */ + while (!(stm_adc.sr & (1 << STM_ADC_SR_ADONS))) + ; + +#if HAS_ADC_TEMP + stm_adc.ccr = ((1 << STM_ADC_CCR_TSVREFE)); +#else + stm_adc.ccr = 0; +#endif + /* Clear any stale status bits */ + stm_adc.sr = 0; + ao_adc_ready = 1; + ao_cmd_register(&ao_adc_cmds[0]); +} |