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#77 [GPIO Expander] - Route isoSPI to GPIO Exander #85

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merged 4 commits into from
Mar 26, 2024
Merged

#77 [GPIO Expander] - Route isoSPI to GPIO Exander #85

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8c074d6
Updated function for creating/sending I2C commands to GPIO expander. …
ameall Mar 17, 2024
65aa32c
Minor syntax fix for i2c write register call within function
ameall Mar 17, 2024
e00f990
adjusted ic address
Mar 26, 2024
2b4a4d3
removed comment
Mar 26, 2024
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108 changes: 16 additions & 92 deletions Core/Src/segment.c
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,8 @@
#define THERM_AVG 15 /* Number of values to average */
#define MAX_VOLT_DELTA 2500
#define MAX_VOLT_DELTA_COUNT 10
#define GPIO_EXPANDER_ADDR 0x40
#define GPIO_REGISTER_ADDR 0x09

//TODO ensure spi 1 is correct for talking to segs
extern SPI_HandleTypeDef hspi1;
Expand Down Expand Up @@ -72,103 +74,25 @@ void segment_init()
push_chip_configuration();
}

void select_therm(uint8_t therm)
{
void select_therm(uint8_t therm){
/* Exit if out of range values */
if (therm < 0 || therm > 32) {
if (therm < 0 || therm > 16){
return;
}

uint8_t i2c_write_data[NUM_CHIPS][3];
uint8_t comm_reg_data[NUM_CHIPS][6];
if (therm <= 8) {
/* Turn off competing multiplexor (therms 9-16) */
for (int chip = 0; chip < NUM_CHIPS; chip++) {
i2c_write_data[chip][0] = 0x92;
i2c_write_data[chip][1] = 0x00;
i2c_write_data[chip][2] = 0x00;
}
serialize_i2c_msg(i2c_write_data, comm_reg_data);
push_chip_configuration();
LTC6804_wrcomm(ltc68041, NUM_CHIPS, comm_reg_data);
LTC6804_stcomm(ltc68041, 4);

/* Turn on desired thermistor */
for (int chip = 0; chip < NUM_CHIPS; chip++) {
i2c_write_data[chip][0] = 0x90;
i2c_write_data[chip][1] = 0x08 + (therm - 1);
i2c_write_data[chip][2] = 0x00;
}
serialize_i2c_msg(i2c_write_data, comm_reg_data);
push_chip_configuration();
LTC6804_wrcomm(ltc68041, NUM_CHIPS, comm_reg_data);
LTC6804_stcomm(ltc68041, 24);
} else if (therm <= 16) {
/* Turn off competing multiplexor (therms 1-8) */
for (int chip = 0; chip < NUM_CHIPS; chip++) {
i2c_write_data[chip][0] = 0x90;
i2c_write_data[chip][1] = 0x00;
i2c_write_data[chip][2] = 0x00;
}
serialize_i2c_msg(i2c_write_data, comm_reg_data);
push_chip_configuration();
LTC6804_wrcomm(ltc68041, NUM_CHIPS, comm_reg_data);
LTC6804_stcomm(ltc68041, 24);

/* Turn on desired thermistor */
for (int chip = 0; chip < NUM_CHIPS; chip++) {
i2c_write_data[chip][0] = 0x92;
i2c_write_data[chip][1] = 0x08 + (therm - 9);
i2c_write_data[chip][2] = 0x00;
}
serialize_i2c_msg(i2c_write_data, comm_reg_data);
push_chip_configuration();
LTC6804_wrcomm(ltc68041,NUM_CHIPS, comm_reg_data);
LTC6804_stcomm(ltc68041, 24);
} else if (therm <= 24) {
/* Turn off competing multiplexor (therms 25-32) */
for (int chip = 0; chip < NUM_CHIPS; chip++) {
i2c_write_data[chip][0] = 0x96;
i2c_write_data[chip][1] = 0x00;
i2c_write_data[chip][2] = 0x00;
}
serialize_i2c_msg(i2c_write_data, comm_reg_data);
push_chip_configuration();
LTC6804_wrcomm(ltc68041,NUM_CHIPS, comm_reg_data);
LTC6804_stcomm(ltc68041, 24);

/* Turn on desired thermistor */
for (int chip = 0; chip < NUM_CHIPS; chip++) {
i2c_write_data[chip][0] = 0x94;
i2c_write_data[chip][1] = 0x08 + (therm - 17);
i2c_write_data[chip][2] = 0x00;
}
serialize_i2c_msg(i2c_write_data, comm_reg_data);
push_chip_configuration();
LTC6804_wrcomm(ltc68041, NUM_CHIPS, comm_reg_data);
LTC6804_stcomm(ltc68041, 24);
} else {
/* Turn off competing multiplexor (therms 17-24) */
for (int chip = 0; chip < NUM_CHIPS; chip++) {
i2c_write_data[chip][0] = 0x94;
i2c_write_data[chip][1] = 0x00;
i2c_write_data[chip][2] = 0x00;
}
serialize_i2c_msg(i2c_write_data, comm_reg_data);
push_chip_configuration();
LTC6804_wrcomm(ltc68041, NUM_CHIPS, comm_reg_data);
LTC6804_stcomm(ltc68041, 24);

/* Turn on desired thermistor */
for (int chip = 0; chip < NUM_CHIPS; chip++) {
i2c_write_data[chip][0] = 0x96;
i2c_write_data[chip][1] = 0x08 + (therm - 25);
i2c_write_data[chip][2] = 0x00;
}
serialize_i2c_msg(i2c_write_data, comm_reg_data);
push_chip_configuration();
LTC6804_wrcomm(ltc68041, NUM_CHIPS, comm_reg_data);
LTC6804_stcomm(ltc68041, 24);
}

// select 0-16 on GPIO expander
for(int chip = 0; chip < NUM_CHIPS; chip++) {
i2c_write_data[chip][0] = GPIO_EXPANDER_ADDR;
i2c_write_data[chip][1] = GPIO_REGISTER_ADDR;
i2c_write_data[chip][2] = therm; // 0-15, will change multiplexer to select thermistor
}
serialize_i2c_msg(i2c_write_data, comm_reg_data);
push_chip_configuration();
LTC6804_wrcomm(ltc68041, NUM_CHIPS, comm_reg_data);
LTC6804_stcomm(ltc68041, 24);
}

int pull_voltages()
Expand Down
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