working with delays
This commit is contained in:
hugo LAMY
@@ -14,10 +14,6 @@ void i2c_init(void) {
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TWBR = ((F_CPU / TWI_FREQ) - 16) / (2 * TWI_PRESCALE_VALUE); // 22.9.1 : (Bit Rate Register) set SCL frequency (formula from datasheet, 22.5.2)
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}
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void i2c_start_repeat(void) { // 22.7.1 : "Repeated START enables the Master to switch between Slaves, Master Transmitter mode and Master Receiver mode without losing control of the bus"
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i2c_start();
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}
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void i2c_start(void) {
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i2c_status = START;
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TWCR = TWI_START_CONDITION; // 22.9.2 : (Control Register) send Start condition (22.7.1) ! writting 1 to TWINT clears it (set it to 0)
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@@ -28,6 +24,9 @@ void i2c_start(void) {
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return i2c_stop();
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}
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}
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void i2c_start_repeat(void) { // 22.7.1 : "Repeated START enables the Master to switch between Slaves, Master Transmitter mode and Master Receiver mode without losing control of the bus"
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i2c_start();
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}
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void i2c_send_addr_w(uint8_t slave_address) {
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if (i2c_status == STOP) {
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@@ -93,8 +92,8 @@ uint8_t i2c_read_ack(void) {
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TWCR = TWI_ACKNOWLEDGE; // 22.7.1 : Master Transmitter Mode
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while (!(TEST(TWCR, TWINT))); // 22.7.1 : Wait for TWINT Flag set. This indicates that the SLA+R/W has been transmitted, and ACK/NACK has been received
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uint8_t status = TWSR & 0b11111000; // p225 example code : Check status for Receiver mode. Mask prescaler bits. If status different from MT_DATA_ACK go to ERROR
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if (status != TW_MT_DATA_ACK) {
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uint8_t status = TWSR & 0b11111000; // Table 22-3 : check status for Receiver mode, mask prescaler bits
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if (status != TW_MR_DATA_ACK) {
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i2c_stop();
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return 0;
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}
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@@ -110,8 +109,8 @@ uint8_t i2c_read_nack(void) {
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TWCR = TWI_NACKNOWLEDGE; // 22.7.1 : Master Transmitter Mode
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while (!(TEST(TWCR, TWINT))); // 22.7.1 : Wait for TWINT Flag set. This indicates that the SLA+R/W has been transmitted, and ACK/NACK has been received
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uint8_t status = TWSR & 0b11111000; // p225 example code : Check status for Receiver mode. Mask prescaler bits. If status different from MT_DATA_ACK go to ERROR
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if (status != TW_MT_DATA_NACK) {
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uint8_t status = TWSR & 0b11111000; // Table 22-3 : check status for Receiver mode, mask prescaler bits
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if (status != TW_MR_DATA_NACK) {
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i2c_stop();
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return 0;
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}
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@@ -1,384 +1,5 @@
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#include "header.h"
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/*
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before init : 11111000
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after init : 11111000
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after start : 1000
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after SLA+W : 11000
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1 : 11000
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2 : 11000
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3 : 11000
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4 : 11000
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5 : 11000
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6 : 11000
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7 : 11000
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8 : 11000
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9 : 11000
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10 : 11000
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20 : 11000
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30 : 11000
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40 : 11000
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50 : 11000
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60 : 11000
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70 : 11000
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80 : 11000
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90 : 11000
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100 : 11000
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110 : 11000
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120 : 11000
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130 : 11000
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140 : 11000
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150 : 11000
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160 : 11000
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170 : 11000
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180 : 11000
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190 : 11000
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200 : 11000
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1200 : 11000
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after stop : 11111000
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*/
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/*
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before init : 11111000
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after init : 11111000
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before start : 11111000
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after start : 1000
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waiting 200ms... : 1000
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done waiting : 1000
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send SLA+W : 1000
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after SLA+W : 11000
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waiting 10ms... : 11000
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done waiting : 11000
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send 0xAC (trigger measurement) : 11000
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after 0xAC : 101000
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send parameter 1st byte 0x33 : 101000
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after 0x33 : 101000
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send parameter 2nd byte 0x00 : 101000
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after 0x00 : 101000
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status ? 0 : 101000
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status ? 10 : 101000
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status ? 20 : 101000
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status ? 30 : 101000
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status ? 40 : 101000
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status ? 50 : 101000
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status ? 60 : 101000
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status ? 70 : 101000
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status ? 80 : 101000
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status ? 90 : 101000
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status ? 100 : 101000
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status ? 110 : 101000
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status ? 120 : 101000
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status ? 130 : 101000
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after stop : 11111000
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*/
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/*
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before init : 11111000 no state information available
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after init : 11111000
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before start : 11111000
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after start : 1000 start condition transmitted
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waiting 200ms... : 1000
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done waiting : 1000
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send SLA+W : 1000
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after SLA+W : 11000 SLA+W transmitted, ACK received
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waiting 10ms... : 11000
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done waiting : 11000
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send 0xAC (trigger measurement) : 11000
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after 0xAC : 101000 data transmitted, ACK received
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send parameter 1st byte 0x33 : 101000
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after 0x33 : 101000
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send parameter 2nd byte 0x00 : 101000
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after 0x00 : 101000
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send repeat start : 101000
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after repeat start : 10000 repeated start condition transmitted
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send SLA+R : 10000
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after SLA+R : 1000000 SLA+R transmitted, ACK received
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status ? 0 : 1000000
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status ? 10 : 1000000
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status ? 20 : 1000000
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status ? 30 : 1000000
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status ? 40 : 1000000
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status ? 50 : 1000000
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status ? 60 : 1000000
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status ? 70 : 1000000
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status ? 80 : 1000000
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status ? 90 : 1000000
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status ? 100 : 1000000
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status ? 110 : 1000000
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status ? 120 : 1000000
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status ? 130 : 1000000
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after stop : 11111000
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*/
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/*
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before init : 11111000 no state information available
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after init : 11111000
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before start : 11111000
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after start : 1000 start condition transmitted
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send 0x71 to get a byte of status word : 1000
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after 0x71 : 1000000 SLA+R transmitted, ACK received
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waiting 200ms... : 1000000
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done waiting : 1000000
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send 0x71 to get a byte of status word : 1000000
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after 0x71 : 1011000 data received, NACK returned
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send SLA+W : 1011000
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after SLA+W : 1011000
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waiting 10ms... : 1011000
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done waiting : 1011000
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send 0xAC (trigger measurement) : 1011000
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after 0xAC : 11111000 no state information available
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send parameter 1st byte 0x33 : 11111000
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after 0x33 : 11111000
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send parameter 2nd byte 0x00 : 11111000
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after 0x00 : 11111000
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send repeat start : 11111000
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after repeat start : 1000 start condition transmitted
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send SLA+R : 1000
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after SLA+R : 1000000 SLA+R transmitted, ACK received
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status ? 0 : 1000000
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status ? 10 : 1000000
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status ? 20 : 1000000
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status ? 30 : 1000000
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status ? 40 : 1000000
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status ? 50 : 1000000
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status ? 60 : 1000000
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status ? 70 : 1000000
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status ? 80 : 1000000
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status ? 90 : 1000000
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status ? 100 : 1000000
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status ? 110 : 1000000
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status ? 120 : 1000000
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status ? 130 : 1000000
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after stop : 11111000
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*/
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/*
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init i2c : 11111000 no state information available
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after init : 11111000
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start transmission : 11111000
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after start : 1000 start condition transmitted
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send SLA+W : 1000
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after SLA+W : 11000 SLA+W transmitted, ACK received
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waiting 10ms... : 11000
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done waiting : 11000
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send 0xAC (trigger measurement) : 11000
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after 0xAC : 101000 data transmitted, ACK received
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send parameter 1st byte 0x33 : 101000
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after 0x33 : 101000
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send parameter 2nd byte 0x00 : 101000
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after 0x00 : 101000
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send repeat start : 101000
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after repeat start : 10000 repeated start condition transmitted
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send SLA+R : 10000
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after SLA+R : 1000000 SLA+R transmitted, ACK received
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status ? 0 : 1000000
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status ? 10 : 1000000
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status ? 20 : 1000000
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status ? 30 : 1000000
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status ? 40 : 1000000
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status ? 50 : 1000000
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status ? 60 : 1000000
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status ? 70 : 1000000
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status ? 80 : 1000000
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status ? 90 : 1000000
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status ? 100 : 1000000
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status ? 110 : 1000000
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status ? 120 : 1000000
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status ? 130 : 1000000
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send stop : 1000000
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after stop : 11111000 no state information available
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*/
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/*
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init i2c : 11111000 no state information available
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after init : 11111000
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start transmission : 11111000
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after start : 1000 start condition transmitted
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send SLA+W : 1000
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after SLA+W : 11000 SLA+W transmitted, ACK received
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send 0xAC (trigger measurement) : 11000
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after 0xAC : 101000 data transmitted, ACK received
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send parameter 1st byte 0x33 : 101000
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after 0x33 : 101000
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send parameter 2nd byte 0x00 : 101000
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after 0x00 : 101000
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send repeat start : 101000
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after repeat start : 10000 repeated start condition transmitted
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send SLA+R : 10000
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after SLA+R : 1000000 SLA+R transmitted, ACK received
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status ? 0 : 1000000
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status ? 10 : 1000000
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status ? 20 : 1000000
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status ? 30 : 1000000
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status ? 40 : 1000000
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status ? 50 : 1000000
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status ? 60 : 1000000
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status ? 70 : 1000000
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status ? 80 : 1000000
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status ? 90 : 1000000
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status ? 100 : 1000000
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status ? 110 : 1000000
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status ? 120 : 1000000
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status ? 130 : 1000000
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send stop : 1000000
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after stop : 11111000 no state information available
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*/
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/*
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init i2c : 11111000 no state information available
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after init : 11111000
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start transmission : 11111000
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after start : 1000 start condition transmitted
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send SLA+W : 1000
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after SLA+W : 11000 SLA+W transmitted, ACK received
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send 0xAC (trigger measurement) : 11000
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after 0xAC : 101000 data transmitted, ACK received
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send parameter 1st byte 0x33 : 101000
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after 0x33 : 101000
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send parameter 2nd byte 0x00 : 101000
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after 0x00 : 101000
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send SLA+R : 101000
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after SLA+R : 110000 data transmitted, NACK received
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status ? 0 : 110000
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status ? 10 : 110000
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status ? 20 : 110000
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status ? 30 : 110000
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status ? 40 : 110000
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status ? 50 : 110000
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status ? 60 : 110000
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status ? 70 : 110000
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status ? 80 : 110000
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status ? 90 : 110000
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status ? 100 : 110000
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status ? 110 : 110000
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status ? 120 : 110000
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status ? 130 : 110000
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send stop : 110000
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after stop : 11111000
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*/
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/*
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init i2c : 11111000 no state information available
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after init : 11111000
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start transmission : 11111000
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after start : 1000 start condition transmitted
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send SLA+W : 1000
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after SLA+W : 11000 SLA+W transmitted, ACK received
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send 0xAC (trigger measurement) : 11000
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after 0xAC : 101000
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send parameter 1st byte 0x33 : 101000
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after 0x33 : 101000
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send parameter 2nd byte 0x00 : 101000
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after 0x00 : 101000
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send repeat start : 101000
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after repeat start : 10000
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send SLA+R : 10000
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after SLA+R : 1000000
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read 1 data : 1000000
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after read : 1011000
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````````````````````````read 2 data : 1011000
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after read : 1011000
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read 3 data : 1011000
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after read : 1011000
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```````````````````````````````````````` : read 4 data : 1011000
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after read : 1011000
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`read 5 data : 1011000
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after read : 1011000
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read 6 data : 1011000
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after read : 1011000
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read 7 data : 1011000
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after read : 1011000
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```````````````````````````` : read 8 data : 1011000
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after read : 1011000
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` : read 9 data : 1011000
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after read : 1011000
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` :
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send stop : 1011000
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after stop : 11111000
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*/
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/*
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init i2c : 11111000 TW_NO_INFO -> No state information available
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after init : 11111000 TW_NO_INFO -> No state information available
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start transmission : 11111000 TW_NO_INFO -> No state information available
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after start : 1000 TW_START -> Start condition transmitted
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send SLA+W : 1000 TW_START -> Start condition transmitted
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after SLA+W : 11000 TW_MT_SLA_ACK -> SLA+W transmitted, ACK received
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send 0xAC (trigger measurement) : 11000 TW_MT_SLA_ACK -> SLA+W transmitted, ACK received
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after 0xAC : 101000 TW_MT_DATA_ACK -> Data transmitted, ACK received
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send parameter 1st byte 0x33 : 101000 TW_MT_DATA_ACK -> Data transmitted, ACK received
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after 0x33 : 101000 TW_MT_DATA_ACK -> Data transmitted, ACK received
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send parameter 2nd byte 0x00 : 101000 TW_MT_DATA_ACK -> Data transmitted, ACK received
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after 0x00 : 101000 TW_MT_DATA_ACK -> Data transmitted, ACK received
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send repeat start : 101000 TW_MT_DATA_ACK -> Data transmitted, ACK received
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after repeat start : 10000 TW_REP_START -> Repeated start condition transmitted
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send SLA+R : 10000 TW_REP_START -> Repeated start condition transmitted
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after SLA+R : 1000000 TW_MR_SLA_ACK -> SLA+R transmitted, ACK received
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read 1 data : 1000000 TW_MR_SLA_ACK -> SLA+R transmitted, ACK received
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after read : 1011000 TW_MR_DATA_NACK -> Data received, NACK returned
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152
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read 2 data : 1011000 TW_MR_DATA_NACK -> Data received, NACK returned
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after read : 1011000 TW_MR_DATA_NACK -> Data received, NACK returned
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196
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read 3 data : 1011000 TW_MR_DATA_NACK -> Data received, NACK returned
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after read : 1011000 TW_MR_DATA_NACK -> Data received, NACK returned
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182
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read 4 data : 1011000 TW_MR_DATA_NACK -> Data received, NACK returned
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after read : 1011000 TW_MR_DATA_NACK -> Data received, NACK returned
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213
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read 5 data : 1011000 TW_MR_DATA_NACK -> Data received, NACK returned
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after read : 1011000 TW_MR_DATA_NACK -> Data received, NACK returned
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255
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read 6 data : 1011000 TW_MR_DATA_NACK -> Data received, NACK returned
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after read : 1011000 TW_MR_DATA_NACK -> Data received, NACK returned
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212
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read 7 data : 1011000 TW_MR_DATA_NACK -> Data received, NACK returned
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after read : 1011000 TW_MR_DATA_NACK -> Data received, NACK returned
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164
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read 8 data : 1011000 TW_MR_DATA_NACK -> Data received, NACK returned
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after read : 1011000 TW_MR_DATA_NACK -> Data received, NACK returned
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255
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read 9 data : 1011000 TW_MR_DATA_NACK -> Data received, NACK returned
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after read : 1011000 TW_MR_DATA_NACK -> Data received, NACK returned
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255
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send stop : 1011000 TW_MR_DATA_NACK -> Data received, NACK returned
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after stop : 11111000 TW_NO_INFO -> No state information available
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*/
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// status codes :
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// -- Master --
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// TW_BUS_ERROR 0x00 = 0b0 = 0 -> illegal start or stop condition
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@@ -402,55 +23,15 @@ send stop : 1011000 TW_MR_DATA_NACK -> Data recei
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#define AHT20_ADDRESS 0x38 // doc AHT20, 7.3 : address of thermistor : 0b111000, 56
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// volatile uint8_t i2c_data = 0;
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void print_hex_value(char c) {
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char buffer[3] = {0};
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int_to_hex_string(c, buffer, 2);
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uart_printstr(buffer);
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}
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void print_status_meaning(uint16_t status) {
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switch (status) {
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case 0x00: uart_printstr("TW_BUS_ERROR -> Illegal start or stop condition"); break;
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case 0x08: uart_printstr("TW_START -> Start condition transmitted"); break;
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case 0x10: uart_printstr("TW_REP_START -> Repeated start condition transmitted"); break;
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case 0x18: uart_printstr("TW_MT_SLA_ACK -> SLA+W transmitted, ACK received"); break;
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case 0x20: uart_printstr("TW_MT_SLA_NACK -> SLA+W transmitted, NACK received"); break;
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case 0x28: uart_printstr("TW_MT_DATA_ACK -> Data transmitted, ACK received"); break;
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case 0x30: uart_printstr("TW_MT_DATA_NACK -> Data transmitted, NACK received"); break;
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case 0x38: uart_printstr("TW_MT_ARB_LOST/TW_MR_ARB_LOST -> Arbitration lost in SLA+W/R or Nack"); break;
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case 0x40: uart_printstr("TW_MR_SLA_ACK -> SLA+R transmitted, ACK received"); break;
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case 0x48: uart_printstr("TW_MR_SLA_NACK -> SLA+R transmitted, NACK received"); break;
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case 0x50: uart_printstr("TW_MR_DATA_ACK -> Data received, ACK returned"); break;
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case 0x58: uart_printstr("TW_MR_DATA_NACK -> Data received, NACK returned"); break;
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case 0x98: uart_printstr("TW_SR_GCALL_DATA_NACK -> General call data received, NACK returned"); break;
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case 0xA8: uart_printstr("TW_ST_SLA_ACK -> SLA+R received, ACK returned"); break;
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case 0xF8: uart_printstr("TW_NO_INFO -> No state information available"); break;
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default: uart_printstr("Unknown status code");
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}
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}
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void print_status(char *str) {
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return;
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||||
uint8_t status;
|
||||
status = TWSR & 0b11111000; // Table 22-2. Status codes for Master Transmitter Mode
|
||||
uint16_t size = 53;
|
||||
size -= uart_printstr(str);
|
||||
size -= uart_printstr(" : ");
|
||||
size -= uart_printstr_itoa_base(status, 2);
|
||||
|
||||
// print status meaning
|
||||
while (size--) {
|
||||
uart_tx(' ');
|
||||
}
|
||||
print_status_meaning(status);
|
||||
uart_printstr_endl("");
|
||||
}
|
||||
|
||||
void print_data() {
|
||||
uint8_t data;
|
||||
for (uint8_t i = 0; i < 10; i++) {
|
||||
for (uint8_t i = 0; i < 7; i++) {
|
||||
data = i2c_read_nack();
|
||||
print_hex_value(data);
|
||||
if (i == 0) {
|
||||
@@ -468,22 +49,23 @@ void print_data() {
|
||||
Boolean aht20_is_status_ready(void) {
|
||||
uint8_t status;
|
||||
|
||||
i2c_start();
|
||||
i2c_send_addr_w(AHT20_ADDRESS);
|
||||
// i2c_start();
|
||||
// i2c_send_addr_w(AHT20_ADDRESS);
|
||||
// i2c_write(0xAC);
|
||||
// i2c_write(0x33);
|
||||
// i2c_write(0x00);
|
||||
i2c_start_repeat();
|
||||
i2c_send_addr_r(AHT20_ADDRESS);
|
||||
i2c_send_addr_r(AHT20_ADDRESS); // AHT20 doc 7.4 : "get a byte of status word by sending 0x71" -> SLA+R == 0x71
|
||||
status = i2c_read_nack();
|
||||
i2c_stop();
|
||||
|
||||
uart_printstr("- status : ");
|
||||
uart_printstr_itoa_base_endl(status, 2);
|
||||
if (status & 0b10000000) {
|
||||
return TRUE;
|
||||
// if ((status & 0x18) != 0x18) { // AHT20 doc 7.4 : "If the status word and 0x18 are not equal to 0x18 ..., if they are equal proceed to the next step"
|
||||
return FALSE;
|
||||
} else {
|
||||
return FALSE;
|
||||
return TRUE;
|
||||
}
|
||||
}
|
||||
|
||||
@@ -493,7 +75,7 @@ void aht20_wait_for_status() {
|
||||
if (aht20_is_status_ready()) {
|
||||
break;
|
||||
}
|
||||
_delay_ms(10);
|
||||
_delay_ms(50);
|
||||
}
|
||||
}
|
||||
|
||||
@@ -522,63 +104,31 @@ int main() {
|
||||
// 9. read 6 bytes
|
||||
// 10. read CRC
|
||||
|
||||
print_status("init i2c");
|
||||
i2c_init();
|
||||
print_status(" after init");
|
||||
|
||||
print_status("\r\nstart transmission");
|
||||
i2c_start();
|
||||
print_status(" after start");
|
||||
|
||||
_delay_ms(200);
|
||||
// aht20_wait_for_status();
|
||||
|
||||
print_status("\r\nwaiting 200ms...");
|
||||
_delay_ms(200);
|
||||
print_status(" done waiting");
|
||||
|
||||
print_status("\r\nsend SLA+W");
|
||||
i2c_send_addr_w(AHT20_ADDRESS);
|
||||
print_status(" after SLA+W");
|
||||
|
||||
print_status("\r\nwaiting 20ms...");
|
||||
_delay_ms(20);
|
||||
print_status(" done waiting");
|
||||
|
||||
print_status("\r\nsend 0xAC (trigger measurement)");
|
||||
i2c_write(0xAC);
|
||||
print_status(" after 0xAC");
|
||||
print_status("send parameter 1st byte 0x33");
|
||||
i2c_write(0x33);
|
||||
print_status(" after 0x33");
|
||||
print_status("send parameter 2nd byte 0x00");
|
||||
i2c_write(0x00);
|
||||
print_status(" after 0x00");
|
||||
|
||||
for (uint8_t i = 0; i < 3; i++) {
|
||||
// print_status("\r\nwaiting 100ms...");
|
||||
// _delay_ms(100);
|
||||
// print_status(" done waiting");
|
||||
// while(1) {
|
||||
for (uint8_t i = 0; i < 6; i++) {
|
||||
i2c_start_repeat();
|
||||
i2c_send_addr_w(AHT20_ADDRESS);
|
||||
|
||||
_delay_ms(20);
|
||||
// aht20_wait_for_status();
|
||||
|
||||
print_status("\r\nsend repeat start");
|
||||
i2c_write(0xAC);
|
||||
i2c_write(0x33);
|
||||
i2c_write(0x00);
|
||||
|
||||
aht20_wait_for_status();
|
||||
|
||||
i2c_start_repeat();
|
||||
print_status(" after repeat start");
|
||||
|
||||
print_status("\r\nsend SLA+R");
|
||||
i2c_send_addr_r(AHT20_ADDRESS);
|
||||
print_status(" after SLA+R");
|
||||
|
||||
print_status("\r\nbefore read data");
|
||||
print_data();
|
||||
print_status(" after read data");
|
||||
|
||||
_delay_ms(300);
|
||||
}
|
||||
|
||||
print_status("\r\nsend stop");
|
||||
i2c_stop();
|
||||
print_status(" after stop");
|
||||
|
||||
while(1);
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user