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/*
* Copyright (c) 2017 Samsung Electronics Co., Ltd.
*
* Contact: Jin Yoon <jinny.yoon@samsung.com>
* Geunsun Lee <gs86.lee@samsung.com>
* Eunyoung Lee <ey928.lee@samsung.com>
* Junkyu Han <junkyu.han@samsung.com>
*
* Licensed under the Flora License, Version 1.1 (the License);
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://floralicense.org/license/
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an AS IS BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdlib.h>
#include <unistd.h>
#include <peripheral_io.h>
#include <tizen.h>
#include <system_info.h>
#include <string.h>
#include "log.h"
#define MCP3008_SPEED 3600000
#define MCP3008_BPW 8
#define MCP3008_TX_WORD1 0x01 /* 0b00000001 */
#define MCP3008_TX_CH0 0x80 /* 0b10000000 */
#define MCP3008_TX_CH1 0x90 /* 0b10010000 */
#define MCP3008_TX_CH2 0xA0 /* 0b10100000 */
#define MCP3008_TX_CH3 0xB0 /* 0b10110000 */
#define MCP3008_TX_CH4 0xC0 /* 0b11000000 */
#define MCP3008_TX_CH5 0xD0 /* 0b11010000 */
#define MCP3008_TX_CH6 0xE0 /* 0b11100000 */
#define MCP3008_TX_CH7 0xF0 /* 0b11110000 */
#define MCP3008_TX_WORD3 0x00 /* 0b00000000 */
#define MCP3008_RX_WORD1_MASK 0x00 /* 0b00000000 */
#define MCP3008_RX_WORD2_NULL_BIT_MASK 0x04 /* 0b00000100 */
#define MCP3008_RX_WORD2_MASK 0x03 /* 0b00000011 */
#define MCP3008_RX_WORD3_MASK 0xFF /* 0b11111111 */
#define UINT10_VALIDATION_MASK 0x3FF
#define MODEL_NAME_KEY "http://tizen.org/system/model_name"
#define MODEL_NAME_RPI3 "rpi3"
#define MODEL_NAME_ARTIK "artik"
static peripheral_spi_h MCP3008_H = NULL;
static unsigned int ref_count = 0;
int resource_adc_mcp3008_init(void)
{
int ret = 0;
int bus = -1;
char *model_name = NULL;
if (MCP3008_H) {
_D("SPI device aleady initialized [ref_count : %u]", ref_count);
ref_count++;
return 0;
}
system_info_get_platform_string(MODEL_NAME_KEY, &model_name);
if (!model_name) {
_E("fail to get model name");
return -1;
}
if (!strcmp(model_name, MODEL_NAME_RPI3)) {
bus = 0;
} else if (!strcmp(model_name, MODEL_NAME_ARTIK)) {
bus = 2;
} else {
_E("unknown model name : %s", model_name);
free(model_name);
return -1;
}
free(model_name);
model_name = NULL;
ret = peripheral_spi_open(bus, 0, &MCP3008_H);
if (PERIPHERAL_ERROR_NONE != ret) {
_E("spi open failed :%s ", get_error_message(ret));
return -1;
}
ret = peripheral_spi_set_mode(MCP3008_H, PERIPHERAL_SPI_MODE_0);
if (PERIPHERAL_ERROR_NONE != ret) {
_E("peripheral_spi_set_mode failed :%s ", get_error_message(ret));
goto error_after_open;
}
ret = peripheral_spi_set_bit_order(MCP3008_H, PERIPHERAL_SPI_BIT_ORDER_MSB);
if (PERIPHERAL_ERROR_NONE != ret) {
_E("peripheral_spi_set_bit_order failed :%s ", get_error_message(ret));
goto error_after_open;
}
ret = peripheral_spi_set_bits_per_word(MCP3008_H, MCP3008_BPW);
if (PERIPHERAL_ERROR_NONE != ret) {
_E("peripheral_spi_set_bits_per_word failed :%s ", get_error_message(ret));
goto error_after_open;
}
ret = peripheral_spi_set_frequency(MCP3008_H, MCP3008_SPEED);
if (PERIPHERAL_ERROR_NONE != ret) {
_E("peripheral_spi_set_frequency failed :%s ", get_error_message(ret));
goto error_after_open;
}
ref_count++;
return 0;
error_after_open:
peripheral_spi_close(MCP3008_H);
MCP3008_H = NULL;
return -1;
}
int resource_read_adc_mcp3008(int ch_num, unsigned int *out_value)
{
unsigned char rx[3] = {0, };
unsigned char tx[3] = {0, };
unsigned char rx_w1 = 0;
unsigned char rx_w2 = 0;
unsigned char rx_w2_nb = 0;
unsigned char rx_w3 = 0;
unsigned short int result = 0;
retv_if(MCP3008_H == NULL, -1);
retv_if(out_value == NULL, -1);
retv_if((ch_num < 0 || ch_num > 7), -1);
tx[0] = MCP3008_TX_WORD1;
switch (ch_num) {
case 0:
tx[1] = MCP3008_TX_CH0;
break;
case 1:
tx[1] = MCP3008_TX_CH1;
break;
case 2:
tx[1] = MCP3008_TX_CH2;
break;
case 3:
tx[1] = MCP3008_TX_CH3;
break;
case 4:
tx[1] = MCP3008_TX_CH4;
break;
case 5:
tx[1] = MCP3008_TX_CH5;
break;
case 6:
tx[1] = MCP3008_TX_CH6;
break;
case 7:
tx[1] = MCP3008_TX_CH7;
break;
default:
tx[1] = MCP3008_TX_CH0;
break;
}
tx[2] = MCP3008_TX_WORD3;
peripheral_spi_transfer(MCP3008_H, tx, rx, 3);
rx_w1 = rx[0] & MCP3008_RX_WORD1_MASK;
retv_if(rx_w1 != 0, -1);
rx_w2_nb = rx[1] & MCP3008_RX_WORD2_NULL_BIT_MASK;
retv_if(rx_w2_nb != 0, -1);
rx_w2 = rx[1] & MCP3008_RX_WORD2_MASK;
rx_w3 = rx[2] & MCP3008_RX_WORD3_MASK;
result = ((rx_w2 << 8) | (rx_w3)) & UINT10_VALIDATION_MASK;
// _D("%hu", result);
*out_value = result;
return 0;
}
void resource_adc_mcp3008_fini(void)
{
if (MCP3008_H)
ref_count--;
else
return;
if (ref_count == 0) {
peripheral_spi_close(MCP3008_H);
MCP3008_H = NULL;
}
return;
}
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