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Define constants for ADC multiplexer settings and describe I2C status flags

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This commit is contained in:
Leon Krieg
2024-09-06 19:47:09 +02:00
parent f4a6c655bd
commit 4ded84f3f8
3 changed files with 33 additions and 26 deletions
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41
src/bus/i2c.c
View File

@@ -3,26 +3,27 @@
#include <avr/io.h>
#define TW_START 0x08
#define TW_REP_START 0x10
#define TW_MT_SLA_ACK 0x18
#define TW_MT_SLA_NACK 0x20
#define TW_MT_DATA_ACK 0x28
#define TW_MR_SLA_ACK 0x40
#define TW_MR_SLA_NACK 0x48
#define TW_MR_DATA_ACK 0x50
#define TW_START 0x08 // Start condition transmitted
#define TW_REP_START 0x10 // Repeated start condition transmitted
#define TW_MT_SLA_ACK 0x18 // SLA+W transmitted, ACK received
#define TW_MT_SLA_NACK 0x20 // SLA+W transmitted, NACK received
#define TW_MT_DATA_ACK 0x28 // Data transmitted, ACK received
#define TW_MR_SLA_ACK 0x40 // SLA+R transmitted, ACK received
#define TW_MR_SLA_NACK 0x48 // SLA+R transmitted, NACK received
#define TW_MR_DATA_ACK 0x50 // Data received, ACK returned
// TODO: Error handling and recovery without watchdog timer.
// TODO: Implement I2C_vect ISR? This may not actually be
// TODO: Error handling and recovery besides watchdog timer.
// TODO: Add more documentation from the atmel data sheet.
// TODO: Implement TWI_vect ISR? This may not actually be
// much better than the blocking approach.
static void I2C_AHT20_Reset(void);
static bool I2C_AHT20_IsCalibrated(void);
static void I2C_AHT20_Calibrate(void);
static void I2C_AHT20_Trigger(void);
static void I2C_AHT20_Reset(void);
static bool I2C_AHT20_IsCalibrated(void);
static void I2C_AHT20_Calibrate(void);
static void I2C_AHT20_Trigger(void);
static int I2C_ADS1115_WriteRegister(byte reg, word data);
static word I2C_ADS1115_ReadRegister(byte reg);
static int I2C_ADS1115_WriteRegister(byte reg, word data);
static word I2C_ADS1115_ReadRegister(byte reg);
int I2C_Init(void)
{
@@ -516,13 +517,13 @@ word I2C_ADS1115_Read(int channel)
// 111 | AINP = AIN3, AINN = GND
mux = 0;
if (channel == 0)
if (channel == ADS01)
mux = 0x4000; // | 01000000 00000000
else if (channel == 1)
else if (channel == ADS02)
mux = 0x5000; // | 01010000 00000000
else if (channel == 2)
else if (channel == ADS03)
mux = 0x6000; // | 01100000 00000000
else if (channel == 3)
else if (channel == ADS04)
mux = 0x7000; // | 01110000 00000000
// Single-shot conversion, active low, continous mode

6
src/bus/i2c.h
View File

@@ -8,6 +8,12 @@
#define AHT02 0x1 // Middle
#define AHT03 0x2 // Lower
// ADC channels
#define ADS01 0x0 // AIN0 GND
#define ADS02 0x1 // AIN1 GND
#define ADS03 0x2 // AIN2 GND
#define ADS04 0x3 // AIN3 GND
int I2C_Init(void);
int I2C_Start(byte addr, byte mode);
int I2C_SetChannel(int channel);