software: added onewire master and DS18XXX driver

ef09fc06 · Tomasz Wlostowski · d459367b · ef09fc06 · ef09fc06
Commit ef09fc06 authored Feb 27, 2012 by Tomasz Wlostowski
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onewire.h software/include/onewire.h +10 -0

onewire.c software/lib/onewire.c +183 -0

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--- a/software/include/onewire.h
+++ b/software/include/onewire.h
+#ifndef ONEWIRE_H_INCLUDED
+#define ONEWIRE_H_INCLUDED
+
+#include "fdelay_lib.h"
+
+int ds18x_init(fdelay_device_t *dev);
+int ds18x_read_temp(fdelay_device_t *dev, int *temp_r);
+
+
+#endif // ONEWIRE_H_INCLUDED
--- a/software/lib/onewire.c
+++ b/software/lib/onewire.c
+#include  <stdio.h>
+#include <stdint.h>
+
+#include "fdelay_lib.h"
+#include "fdelay_private.h"
+
+#define   R_CSR  0x0
+#define   R_CDR  0x4
+
+#define   CSR_DAT_MSK  (1<<0)
+#define   CSR_RST_MSK  (1<<1)
+#define   CSR_OVD_MSK  (1<<2)
+#define   CSR_CYC_MSK  (1<<3)
+#define   CSR_PWR_MSK  (1<<4)
+#define   CSR_IRQ_MSK  (1<<6)
+#define   CSR_IEN_MSK  (1<<7)
+#define   CSR_SEL_OFS  8
+#define   CSR_SEL_MSK  (0xF<<8)
+#define   CSR_POWER_OFS  16
+#define   CSR_POWER_MSK  (0xFFFF<<16)
+#define   CDR_NOR_MSK  (0xFFFF<<0)
+#define   CDR_OVD_OFS  16
+#define   CDR_OVD_MSK  (0xFFFF<<16)
+
+
+#define ow_writel(data, addr) dev->writel(dev->priv_io, data, (hw->base_onewire + (addr)))
+#define ow_readl(addr) dev->readl(dev->priv_io, (hw->base_onewire + (addr)))
+
+#define CLK_DIV_NOR 624/2
+#define CLK_DIV_OVD 124/2
+
+static void ow_init(fdelay_device_t *dev)
+{
+	fd_decl_private(dev);
+    ow_writel(((CLK_DIV_NOR & CDR_NOR_MSK) | (( CLK_DIV_OVD << CDR_OVD_OFS) & CDR_OVD_MSK)), R_CDR);
+}
+
+static int ow_reset(fdelay_device_t *dev, int port)
+{
+    fd_decl_private(dev);
+    uint32_t data = ((port<<CSR_SEL_OFS) & CSR_SEL_MSK) | CSR_CYC_MSK | CSR_RST_MSK;
+    ow_writel(data, R_CSR);
+    while(ow_readl(R_CSR) & CSR_CYC_MSK);
+    uint32_t reg = ow_readl(R_CSR);
+    return ~reg & CSR_DAT_MSK;
+}
+
+static int slot(fdelay_device_t *dev, int port, int bit)
+{
+	fd_decl_private(dev);
+	uint32_t data;
+    data = ((port<<CSR_SEL_OFS) & CSR_SEL_MSK) | CSR_CYC_MSK | (bit & CSR_DAT_MSK);
+    ow_writel(data, R_CSR);
+    while(ow_readl(R_CSR) & CSR_CYC_MSK);
+    uint32_t   reg = ow_readl(R_CSR);
+    return reg & CSR_DAT_MSK;
+}
+
+static int read_bit(fdelay_device_t *dev, int port) { return slot(dev, port, 0x1); }
+static int write_bit(fdelay_device_t *dev, int port, int bit) { return slot(dev, port, bit); }
+
+
+int ow_read_byte(fdelay_device_t *dev, int port) {
+    int  data = 0, i;
+    for(i=0;i<8;i++)
+         data |= read_bit(dev, port) << i;
+    return data;
+}
+
+int ow_write_byte(fdelay_device_t *dev, int port, int byte)
+{
+ int  data = 0;
+    int   byte_old = byte, i;
+    for (i=0;i<8;i++){
+         data |= write_bit(dev, port, (byte & 0x1)) << i;
+         byte >>= 1;
+    }
+
+    return byte_old == data ? 0 : -1;
+}
+
+int ow_write_block(fdelay_device_t *dev, int port, uint8_t *block, int len)
+{
+    int i;
+    for(i=0;i<len;i++)
+    {
+        *block++ = ow_write_byte(dev, port, *block);
+    }
+    return 0;
+}
+
+int ow_read_block(fdelay_device_t *dev, int port, uint8_t *block, int len)
+{
+   int i;
+    for(i=0;i<len;i++)
+    {
+        *block++ = ow_read_byte(dev, port);
+    }
+    return 0;
+}
+
+#define    ROM_SEARCH  0xF0
+#define    ROM_READ  0x33
+#define    ROM_MATCH  0x55
+#define    ROM_SKIP  0xCC
+#define    ROM_ALARM_SEARCH  0xEC
+
+#define    CONVERT_TEMP  0x44
+#define    WRITE_SCRATCHPAD  0x4E
+#define    READ_SCRATCHPAD  0xBE
+#define    COPY_SCRATCHPAD  0x48
+#define    RECALL_EEPROM  0xB8
+#define    READ_POWER_SUPPLY  0xB4
+
+static uint8_t ds18x_id [8];
+
+
+int ds18x_read_serial(fdelay_device_t *dev, uint8_t *id)
+{
+    int i;
+
+    if(!ow_reset(dev, 0))
+        return -1;
+
+    ow_write_byte(dev, 0, ROM_READ);
+    for(i=0;i<8;i++)
+    {
+		*id = ow_read_byte(dev, 0);
+        id++;
+    }
+
+    return 0;
+}
+
+static int ds18x_access(fdelay_device_t *dev, uint8_t *id)
+{
+    int i;
+    if(!ow_reset(dev, 0))
+		return -1;
+
+    if(ow_write_byte(dev, 0, ROM_MATCH) < 0)
+		return -1;
+    for(i=0;i<8;i++)
+		if(ow_write_byte(dev, 0, id[i]) < 0)
+			return -1;
+}
+
+int ds18x_read_temp(fdelay_device_t *dev, int *temp_r)
+{
+    int i;
+    uint8_t data[9];
+
+
+	if(ds18x_access(dev, ds18x_id) < 0)
+		return -1;
+    ow_write_byte(dev, 0, READ_SCRATCHPAD);
+
+    for(i=0;i<9;i++) data[i] = ow_read_byte(dev, 0);
+
+    int  temp = ((int)data[1] << 8) | ((int)data[0]);
+    if(temp & 0x1000)
+       temp = -0x10000 + temp;
+
+    ds18x_access(dev, ds18x_id);
+    ow_write_byte(dev, 0, CONVERT_TEMP);
+
+	if(temp_r) *temp_r = temp;
+	return 0;
+}
+
+int ds18x_init(fdelay_device_t *dev)
+{
+
+	ow_init(dev);
+	if(ds18x_read_serial(dev, ds18x_id) < 0)
+		return -1;
+
+	dbg("Found DS18xx sensor: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
+		ds18x_id[0], ds18x_id[1], ds18x_id[2], ds18x_id[3],
+		ds18x_id[4], ds18x_id[5], ds18x_id[6], ds18x_id[7]);
+
+	return ds18x_read_temp(dev, NULL);
+}