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/*
* 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_ms5607.h"
#define AO_MS5607_CS_GPIO stm_gpioc
#define AO_MS5607_CS 4
#define AO_MS5607_CS_MASK (1 << AO_MS5607_CS)
#define AO_MS5607_SPI_INDEX (STM_SPI_INDEX(1))
struct ms5607_prom {
uint16_t reserved;
uint16_t sens;
uint16_t off;
uint16_t tcs;
uint16_t tco;
uint16_t tref;
uint16_t tempsens;
uint16_t crc;
};
static struct ms5607_prom ms5607_prom;
static void
ao_ms5607_start(void) {
ao_spi_get(AO_MS5607_SPI_INDEX);
stm_gpio_set(&AO_MS5607_CS_GPIO, AO_MS5607_CS, 0);
}
static void
ao_ms5607_stop(void) {
stm_gpio_set(&AO_MS5607_CS_GPIO, AO_MS5607_CS, 1);
ao_spi_put(AO_MS5607_SPI_INDEX);
}
static void
ao_ms5607_reset(void) {
uint8_t cmd;
cmd = AO_MS5607_RESET;
ao_ms5607_start();
ao_spi_send(&cmd, 1, AO_MS5607_SPI_INDEX);
ao_delay(AO_MS_TO_TICKS(100));
ao_ms5607_stop();
}
static uint16_t
ao_ms5607_prom_read(uint8_t addr)
{
uint8_t cmd = AO_MS5607_PROM_READ(addr);
uint8_t d[2];
uint16_t v;
ao_ms5607_start();
ao_spi_send(&cmd, 1, AO_MS5607_SPI_INDEX);
ao_spi_recv(d, 2, AO_MS5607_SPI_INDEX);
ao_ms5607_stop();
v = ((uint16_t) d[0] << 8) | (uint16_t) d[1];
// printf ("ms5607_prom_read recv %02x %02x -> %04x\n", d[0], d[1], v);
return v;
}
static void
ao_ms5607_init_chip(void) {
uint8_t addr;
uint16_t *prom;
ao_ms5607_reset();
prom = &ms5607_prom.reserved;
for (addr = 0; addr <= 7; addr++)
prom[addr] = ao_ms5607_prom_read(addr);
printf ("reserved: %d\n", ms5607_prom.reserved);
printf ("sens: %d\n", ms5607_prom.sens);
printf ("off: %d\n", ms5607_prom.off);
printf ("tcs: %d\n", ms5607_prom.tcs);
printf ("tco: %d\n", ms5607_prom.tco);
printf ("tref: %d\n", ms5607_prom.tref);
printf ("tempsens: %d\n", ms5607_prom.tempsens);
printf ("crc: %d\n", ms5607_prom.crc);
}
static uint32_t
ao_ms5607_convert(uint8_t cmd) {
uint8_t reply[3];
uint8_t read;
ao_ms5607_start();
ao_spi_send(&cmd, 1, AO_MS5607_SPI_INDEX);
ao_ms5607_stop();
ao_delay(AO_MS_TO_TICKS(10));
ao_ms5607_start();
read = AO_MS5607_ADC_READ;
ao_spi_send(&read, 1, AO_MS5607_SPI_INDEX);
ao_spi_recv(&reply, 3, AO_MS5607_SPI_INDEX);
ao_ms5607_stop();
return ((uint32_t) reply[0] << 16) | ((uint32_t) reply[1] << 8) | (uint32_t) reply[2];
}
static void
ao_ms5607_dump(void)
{
uint8_t addr;
uint32_t D1, D2;
int32_t dT;
int32_t TEMP;
int64_t OFF;
int64_t SENS;
int32_t P;
D2 = ao_ms5607_convert(AO_MS5607_CONVERT_D2_4096);
printf ("Conversion D2: %d\n", D2);
D1 = ao_ms5607_convert(AO_MS5607_CONVERT_D1_4096);
printf ("Conversion D1: %d\n", D1);
dT = D2 - ((int32_t) ms5607_prom.tref << 8);
TEMP = 2000 + (((int64_t) dT * ms5607_prom.tempsens) >> 23);
OFF = ((int64_t) ms5607_prom.off << 17) + (((int64_t) ms5607_prom.tco * dT) >> 6);
SENS = ((int64_t) ms5607_prom.sens << 16) + (((int64_t) ms5607_prom.tcs * dT) >> 7);
if (TEMP < 2000) {
int32_t T2 = ((int64_t) dT * (int64_t) dT) >> 31;
int32_t TEMPM = TEMP - 2000;
int64_t OFF2 = (61 * (int64_t) TEMPM * (int64_t) TEMPM) >> 4;
int64_t SENS2 = 2 * (int64_t) TEMPM * (int64_t) TEMPM;
}
P = ((((int64_t) D1 * SENS) >> 21) - OFF) >> 15;
printf ("Temperature: %d\n", TEMP);
printf ("Pressure %d\n", P);
}
__code struct ao_cmds ao_ms5607_cmds[] = {
{ ao_ms5607_init_chip, "i\0Init MS5607" },
{ ao_ms5607_dump, "p\0Display MS5607 data" },
{ 0, NULL },
};
void
ao_ms5607_init(void)
{
ao_cmd_register(&ao_ms5607_cmds[0]);
stm_rcc.ahbenr |= (1 << STM_RCC_AHBENR_GPIOCEN);
stm_gpio_set(&AO_MS5607_CS_GPIO, AO_MS5607_CS, 1);
stm_moder_set(&AO_MS5607_CS_GPIO, AO_MS5607_CS, STM_MODER_OUTPUT);
}
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