diff options
Diffstat (limited to 'src/lpc/ao_adc_lpc.c')
| -rw-r--r-- | src/lpc/ao_adc_lpc.c | 229 |
1 files changed, 229 insertions, 0 deletions
diff --git a/src/lpc/ao_adc_lpc.c b/src/lpc/ao_adc_lpc.c new file mode 100644 index 00000000..70e8b2d6 --- /dev/null +++ b/src/lpc/ao_adc_lpc.c @@ -0,0 +1,229 @@ +/* + * 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> +#include <ao_data.h> + +#ifndef AO_ADC_0 +#define AO_ADC_0 0 +#endif + +#ifndef AO_ADC_1 +#define AO_ADC_1 0 +#endif + +#ifndef AO_ADC_2 +#define AO_ADC_2 0 +#endif + +#ifndef AO_ADC_3 +#define AO_ADC_3 0 +#endif + +#ifndef AO_ADC_4 +#define AO_ADC_4 0 +#endif + +#ifndef AO_ADC_5 +#define AO_ADC_5 0 +#endif + +#ifndef AO_ADC_6 +#define AO_ADC_6 0 +#endif + +#ifndef AO_ADC_7 +#define AO_ADC_7 0 +#endif + +#if AO_ADC_7 +# define AO_ADC_LAST 7 +#else +# if AO_ADC_6 +# define AO_ADC_LAST 6 +# else +# if AO_ADC_5 +# define AO_ADC_LAST 5 +# else +# if AO_ADC_4 +# define AO_ADC_LAST 4 +# else +# if AO_ADC_3 +# define AO_ADC_LAST 3 +# else +# if AO_ADC_2 +# define AO_ADC_LAST 2 +# else +# if AO_ADC_1 +# define AO_ADC_LAST 1 +# else +# if AO_ADC_0 +# define AO_ADC_LAST 0 +# endif +# endif +# endif +# endif +# endif +# endif +# endif +#endif + +static uint8_t ao_adc_ready; + +void lpc_adc_isr(void) +{ + uint16_t *out = (uint16_t *) &ao_data_ring[ao_data_head].adc; + vuint32_t *in = &lpc_adc.dr[0]; + + /* Store converted values in packet */ + +#if AO_ADC_0 + *out++ = ((uint16_t) *in++) >> 1; +#endif +#if AO_ADC_1 + *out++ = ((uint16_t) *in++) >> 1; +#endif +#if AO_ADC_2 + *out++ = ((uint16_t) *in++) >> 1; +#endif +#if AO_ADC_3 + *out++ = ((uint16_t) *in++) >> 1; +#endif +#if AO_ADC_4 + *out++ = ((uint16_t) *in++) >> 1; +#endif +#if AO_ADC_5 + *out++ = ((uint16_t) *in++) >> 1; +#endif +#if AO_ADC_6 + *out++ = ((uint16_t) *in++) >> 1; +#endif +#if AO_ADC_7 + *out++ = ((uint16_t) *in++) >> 1; +#endif + + AO_DATA_PRESENT(AO_DATA_ADC); + if (ao_data_present == AO_DATA_ALL) { +#if HAS_MS5607 + ao_data_ring[ao_data_head].ms5607_raw = ao_ms5607_current; +#endif +#if HAS_MMA655X + ao_data_ring[ao_data_head].mma655x = ao_mma655x_current; +#endif +#if HAS_HMC5883 + ao_data_ring[ao_data_head].hmc5883 = ao_hmc5883_current; +#endif +#if HAS_MPU6000 + ao_data_ring[ao_data_head].mpu6000 = ao_mpu6000_current; +#endif + ao_data_ring[ao_data_head].tick = ao_tick_count; + ao_data_head = ao_data_ring_next(ao_data_head); + ao_wakeup((void *) &ao_data_head); + } + ao_adc_ready = 1; +} + +#define AO_ADC_MASK ((AO_ADC_0 << 0) | \ + (AO_ADC_1 << 1) | \ + (AO_ADC_2 << 2) | \ + (AO_ADC_3 << 3) | \ + (AO_ADC_4 << 4) | \ + (AO_ADC_5 << 5) | \ + (AO_ADC_6 << 6) | \ + (AO_ADC_7 << 7)) + +#define AO_ADC_CLKDIV (AO_LPC_CLKOUT / 4500000) + +/* + * Start the ADC sequence using the DMA engine + */ +void +ao_adc_poll(void) +{ + if (!ao_adc_ready) + return; + ao_adc_ready = 0; + + lpc_adc.cr = ((AO_ADC_MASK << LPC_ADC_CR_SEL) | + (AO_ADC_CLKDIV << LPC_ADC_CR_CLKDIV) | + (1 << LPC_ADC_CR_BURST) | + (LPC_ADC_CR_CLKS_11 << LPC_ADC_CR_CLKS)); +} + +static void +ao_adc_dump(void) __reentrant +{ + struct ao_data packet; + int16_t *d; + uint8_t i; + + ao_data_get(&packet); +#ifdef AO_ADC_DUMP + AO_ADC_DUMP(&packet); +#else + printf("tick: %5u", packet.tick); + d = (int16_t *) (&packet.adc); + for (i = 0; i < AO_NUM_ADC; i++) + printf (" %2d: %5d", i, d[i]); + printf("\n"); +#endif +} + +__code struct ao_cmds ao_adc_cmds[] = { + { ao_adc_dump, "a\0Display current ADC values" }, + { 0, NULL }, +}; + +void +ao_adc_init(void) +{ + lpc_scb.sysahbclkctrl |= (1 << LPC_SCB_SYSAHBCLKCTRL_ADC); + lpc_scb.pdruncfg &= ~(1 << LPC_SCB_PDRUNCFG_ADC_PD); + + /* Enable interrupt when last channel is complete */ + lpc_adc.inten = (1 << AO_ADC_LAST); + + lpc_nvic_set_enable(LPC_ISR_ADC_POS); + lpc_nvic_set_priority(LPC_ISR_ADC_POS, AO_LPC_NVIC_CLOCK_PRIORITY); +#if AO_ADC_0 + ao_enable_analog(0, 11); +#endif +#if AO_ADC_1 + ao_enable_analog(0, 12); +#endif +#if AO_ADC_2 + ao_enable_analog(0, 13); +#endif +#if AO_ADC_3 + ao_enable_analog(0, 14); +#endif +#if AO_ADC_4 + ao_enable_analog(0, 14); +#endif +#if AO_ADC_5 + ao_enable_analog(0, 14); +#endif +#if AO_ADC_6 + ao_enable_analog(0, 14); +#endif +#if AO_ADC_7 + ao_enable_analog(0, 14); +#endif + ao_cmd_register(&ao_adc_cmds[0]); + + ao_adc_ready = 1; +} |