/* * Copyright © 2012 Keith Packard * * 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 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) | \ (0 << STM_ADC_CR2_ALIGN) | \ (0 << STM_ADC_CR2_EOCS) | \ (1 << STM_ADC_CR2_DDS) | \ (1 << STM_ADC_CR2_DMA) | \ (STM_ADC_CR2_DELS_UNTIL_READ << 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(int arg) { 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, 0); 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 )); /* 384 cycle sample time for everyone */ stm_adc.smpr1 = 0x3ffff; stm_adc.smpr2 = 0x3fffffff; stm_adc.smpr3 = 0x3fffffff; 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_dma_alloc(STM_DMA_INDEX(STM_DMA_CHANNEL_ADC1)); ao_cmd_register(&ao_adc_cmds[0]); }