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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; either version 2 of the License, or
* (at your option) any later version.
*
* 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_exti.h>
#include <ao_ms5607.h>
#if HAS_MS5607 || HAS_MS5611
__xdata struct ao_ms5607_prom ao_ms5607_prom;
static __xdata uint8_t ms5607_configured;
#ifndef AO_MS5607_SPI_SPEED
#define AO_MS5607_SPI_SPEED AO_SPI_SPEED_FAST
#endif
static void
ao_ms5607_start(void) {
ao_spi_get_bit(AO_MS5607_CS_PORT, AO_MS5607_CS_PIN, AO_MS5607_CS, AO_MS5607_SPI_INDEX, AO_MS5607_SPI_SPEED);
}
static void
ao_ms5607_stop(void) {
ao_spi_put_bit(AO_MS5607_CS_PORT, AO_MS5607_CS_PIN, AO_MS5607_CS, AO_MS5607_SPI_INDEX);
}
static void
ao_ms5607_reset(void) {
uint8_t cmd;
cmd = AO_MS5607_RESET;
ao_ms5607_start();
ao_spi_send(DATA_TO_XDATA(&cmd), 1, AO_MS5607_SPI_INDEX);
ao_delay(AO_MS_TO_TICKS(10));
ao_ms5607_stop();
}
static uint8_t
ao_ms5607_crc(uint8_t *prom)
{
uint8_t crc_byte = prom[15];
uint8_t cnt;
uint16_t n_rem = 0;
uint8_t n_bit;
uint8_t *p = prom;
prom[15] = 0;
for (cnt = 0; cnt < 16; cnt++) {
n_rem ^= *p++;
for (n_bit = 8; n_bit > 0; n_bit--) {
if (n_rem & 0x8000)
n_rem = (n_rem << 1) ^ 0x3000;
else
n_rem = (n_rem << 1);
}
}
n_rem = (n_rem >> 12) & 0xf;
prom[15] = crc_byte;
return n_rem;
}
static int
ao_ms5607_prom_valid(uint8_t *prom)
{
uint8_t crc;
int i;
uint8_t *p;
/* Look for a value other than 0x0000 or 0xffff */
p = prom;
for (i = 0; i < 16; i++)
if (*p++ + 1 > 1)
break;
if (i == 16)
return false;
crc = ao_ms5607_crc(prom);
if (crc != (prom[15] & 0xf))
return false;
return true;
}
static void
ao_ms5607_prom_read(__xdata struct ao_ms5607_prom *prom)
{
uint8_t addr;
uint16_t *r;
r = (__xdata uint16_t *) prom;
for (addr = 0; addr < 8; addr++) {
uint8_t cmd = AO_MS5607_PROM_READ(addr);
ao_ms5607_start();
ao_spi_send(DATA_TO_XDATA(&cmd), 1, AO_MS5607_SPI_INDEX);
ao_spi_recv(r, 2, AO_MS5607_SPI_INDEX);
ao_ms5607_stop();
r++;
}
if (!ao_ms5607_prom_valid((uint8_t *) prom))
ao_panic(AO_PANIC_SELF_TEST_MS5607);
#if __BYTE_ORDER == __LITTLE_ENDIAN
/* Byte swap */
r = (uint16_t *) prom;
for (addr = 0; addr < 8; addr++) {
uint8_t *t = (uint8_t *) r;
uint8_t a = t[0];
t[0] = t[1];
t[1] = a;
r++;
}
#endif
}
void
ao_ms5607_setup(void)
{
if (ms5607_configured)
return;
ms5607_configured = 1;
ao_ms5607_reset();
ao_ms5607_prom_read(&ao_ms5607_prom);
}
static __xdata volatile uint8_t ao_ms5607_done;
static void
ao_ms5607_isr(void)
{
ao_exti_disable(AO_MS5607_MISO_PORT, AO_MS5607_MISO_PIN);
ao_ms5607_done = 1;
ao_wakeup((__xdata void *) &ao_ms5607_done);
}
static uint32_t
ao_ms5607_get_sample(uint8_t cmd) {
__xdata uint8_t reply[3];
__xdata uint8_t read;
ao_ms5607_done = 0;
ao_ms5607_start();
ao_spi_send(DATA_TO_XDATA(&cmd), 1, AO_MS5607_SPI_INDEX);
ao_exti_enable(AO_MS5607_MISO_PORT, AO_MS5607_MISO_PIN);
#if AO_MS5607_PRIVATE_PINS
ao_spi_put(AO_MS5607_SPI_INDEX);
#endif
ao_arch_block_interrupts();
while (!ao_gpio_get(AO_MS5607_MISO_PORT, AO_MS5607_MISO_PIN, AO_MS5607_MISO) &&
!ao_ms5607_done)
ao_sleep((void *) &ao_ms5607_done);
ao_arch_release_interrupts();
#if AO_MS5607_PRIVATE_PINS
stm_gpio_set(AO_MS5607_CS_PORT, AO_MS5607_CS_PIN, 1);
#else
ao_ms5607_stop();
#endif
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];
}
#ifndef AO_MS5607_BARO_OVERSAMPLE
#define AO_MS5607_BARO_OVERSAMPLE 2048
#endif
#ifndef AO_MS5607_TEMP_OVERSAMPLE
#define AO_MS5607_TEMP_OVERSAMPLE AO_MS5607_BARO_OVERSAMPLE
#endif
#define token_paster(x,y) x ## y
#define token_evaluator(x,y) token_paster(x,y)
#define AO_CONVERT_D1 token_evaluator(AO_MS5607_CONVERT_D1_, AO_MS5607_BARO_OVERSAMPLE)
#define AO_CONVERT_D2 token_evaluator(AO_MS5607_CONVERT_D2_, AO_MS5607_TEMP_OVERSAMPLE)
void
ao_ms5607_sample(__xdata struct ao_ms5607_sample *sample)
{
sample->pres = ao_ms5607_get_sample(AO_CONVERT_D1);
sample->temp = ao_ms5607_get_sample(AO_CONVERT_D2);
}
#ifdef _CC1111_H_
#include "ao_ms5607_convert_8051.c"
#else
#include "ao_ms5607_convert.c"
#endif
#ifndef HAS_MS5607_TASK
#define HAS_MS5607_TASK HAS_TASK
#endif
__xdata struct ao_ms5607_sample ao_ms5607_current;
#if HAS_MS5607_TASK
static void
ao_ms5607(void)
{
struct ao_ms5607_sample sample;
ao_ms5607_setup();
for (;;)
{
ao_ms5607_sample(&sample);
ao_arch_block_interrupts();
ao_ms5607_current = sample;
AO_DATA_PRESENT(AO_DATA_MS5607);
AO_DATA_WAIT();
ao_arch_release_interrupts();
}
}
__xdata struct ao_task ao_ms5607_task;
#endif
#if HAS_TASK
void
ao_ms5607_info(void)
{
printf ("ms5607 reserved: %u\n", ao_ms5607_prom.reserved);
printf ("ms5607 sens: %u\n", ao_ms5607_prom.sens);
printf ("ms5607 off: %u\n", ao_ms5607_prom.off);
printf ("ms5607 tcs: %u\n", ao_ms5607_prom.tcs);
printf ("ms5607 tco: %u\n", ao_ms5607_prom.tco);
printf ("ms5607 tref: %u\n", ao_ms5607_prom.tref);
printf ("ms5607 tempsens: %u\n", ao_ms5607_prom.tempsens);
printf ("ms5607 crc: %u\n", ao_ms5607_prom.crc);
}
static void
ao_ms5607_dump(void)
{
__xdata struct ao_ms5607_value value;
ao_ms5607_convert(&ao_ms5607_current, &value);
printf ("Pressure: %8lu %8ld\n", ao_ms5607_current.pres, value.pres);
printf ("Temperature: %8lu %8ld\n", ao_ms5607_current.temp, value.temp);
printf ("Altitude: %ld\n", ao_pa_to_altitude(value.pres));
}
__code struct ao_cmds ao_ms5607_cmds[] = {
{ ao_ms5607_dump, "B\0Display MS5607 data" },
{ 0, NULL },
};
#endif /* HAS_TASK */
void
ao_ms5607_init(void)
{
ms5607_configured = 0;
ao_spi_init_cs(AO_MS5607_CS_PORT, (1 << AO_MS5607_CS_PIN));
#if HAS_TASK
ao_cmd_register(&ao_ms5607_cmds[0]);
#endif
#if HAS_MS5607_TASK
ao_add_task(&ao_ms5607_task, ao_ms5607, "ms5607");
#endif
/* Configure the MISO pin as an interrupt; when the
* conversion is complete, the MS5607 will raise this
* pin as a signal
*/
ao_exti_setup(AO_MS5607_MISO_PORT,
AO_MS5607_MISO_PIN,
AO_EXTI_MODE_RISING|
AO_EXTI_PIN_NOCONFIGURE,
ao_ms5607_isr);
}
#endif
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