2 * Copyright © 2012 Keith Packard <keithp@keithp.com>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
19 #include "ao_ms5607.h"
32 static struct ms5607_prom ms5607_prom;
35 ao_ms5607_start(void) {
36 ao_spi_get(AO_MS5607_SPI_INDEX);
37 stm_gpio_set(&AO_MS5607_CS_GPIO, AO_MS5607_CS, 0);
41 ao_ms5607_stop(void) {
42 stm_gpio_set(&AO_MS5607_CS_GPIO, AO_MS5607_CS, 1);
43 ao_spi_put(AO_MS5607_SPI_INDEX);
47 ao_ms5607_reset(void) {
50 cmd = AO_MS5607_RESET;
52 ao_spi_send(&cmd, 1, AO_MS5607_SPI_INDEX);
53 ao_delay(AO_MS_TO_TICKS(10));
58 ao_ms5607_prom_read(uint8_t addr)
60 uint8_t cmd = AO_MS5607_PROM_READ(addr);
65 ao_spi_send(&cmd, 1, AO_MS5607_SPI_INDEX);
66 ao_spi_recv(d, 2, AO_MS5607_SPI_INDEX);
68 return ((uint16_t) d[0] << 8) | (uint16_t) d[1];
72 ao_ms5607_init_chip(void) {
77 prom = &ms5607_prom.reserved;
79 for (addr = 0; addr <= 7; addr++)
80 prom[addr] = ao_ms5607_prom_read(addr);
81 printf ("reserved: 0x%x\n", ms5607_prom.reserved);
82 printf ("sens: 0x%x\n", ms5607_prom.sens);
83 printf ("off: 0x%x\n", ms5607_prom.off);
84 printf ("tcs: 0x%x\n", ms5607_prom.tcs);
85 printf ("tco: 0x%x\n", ms5607_prom.tco);
86 printf ("tref: 0x%x\n", ms5607_prom.tref);
87 printf ("tempsens: 0x%x\n", ms5607_prom.tempsens);
88 printf ("crc: 0x%x\n", ms5607_prom.crc);
92 ao_ms5607_convert(uint8_t cmd) {
97 ao_spi_send(&cmd, 1, AO_MS5607_SPI_INDEX);
100 ao_delay(AO_MS_TO_TICKS(20));
103 read = AO_MS5607_ADC_READ;
104 ao_spi_send(&read, 1, AO_MS5607_SPI_INDEX);
105 ao_spi_recv(&reply, 3, AO_MS5607_SPI_INDEX);
108 return ((uint32_t) reply[0] << 16) | ((uint32_t) reply[1] << 8) | (uint32_t) reply[2];
122 D2 = ao_ms5607_convert(AO_MS5607_CONVERT_D2_4096);
123 printf ("Conversion D2: %d\n", D2);
124 D1 = ao_ms5607_convert(AO_MS5607_CONVERT_D1_4096);
125 printf ("Conversion D1: %d\n", D1);
127 dT = D2 - ((int32_t) ms5607_prom.tref << 8);
129 TEMP = 2000 + (((int64_t) dT * ms5607_prom.tempsens) >> 23);
131 OFF = ((int64_t) ms5607_prom.off << 17) + (((int64_t) ms5607_prom.tco * dT) >> 6);
133 SENS = ((int64_t) ms5607_prom.sens << 16) + (((int64_t) ms5607_prom.tcs * dT) >> 7);
136 int32_t T2 = ((int64_t) dT * (int64_t) dT) >> 31;
137 int32_t TEMPM = TEMP - 2000;
138 int64_t OFF2 = (61 * (int64_t) TEMPM * (int64_t) TEMPM) >> 4;
139 int64_t SENS2 = 2 * (int64_t) TEMPM * (int64_t) TEMPM;
142 P = ((((int64_t) D1 * SENS) >> 21) - OFF) >> 15;
144 printf ("Temperature: %d\n", TEMP);
145 printf ("Pressure %d\n", P);
148 __code struct ao_cmds ao_ms5607_cmds[] = {
149 { ao_ms5607_init_chip, "i\0Init MS5607" },
150 { ao_ms5607_dump, "p\0Display MS5607 data" },
157 ao_cmd_register(&ao_ms5607_cmds[0]);
158 ao_spi_init_cs(AO_MS5607_CS_GPIO, (1 << AO_MS5607_CS));