3w6 - Refactor use of AVR only I2C functions (#14339)
* Refactor use of legacy i2c functions * Align rev2 * Review fixes
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@ -35,8 +35,6 @@ extern i2c_status_t tca9555_status;
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// | 0 | 1 | 0 | 0 | A2 | A1 | A0 |
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// | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
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#define I2C_ADDR 0b0100000
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#define I2C_ADDR_WRITE ((I2C_ADDR << 1) | I2C_WRITE)
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#define I2C_ADDR_READ ((I2C_ADDR << 1) | I2C_READ)
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// Register addresses
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#define IODIRA 0x06 // i/o direction register
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@ -64,19 +62,14 @@ uint8_t init_tca9555(void) {
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// - unused : input : 1
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// - input : input : 1
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// - driving : output : 0
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tca9555_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT);
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if (tca9555_status) goto out;
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tca9555_status = i2c_write(IODIRA, I2C_TIMEOUT);
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if (tca9555_status) goto out;
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uint8_t conf[2] = {
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// This means: write on pin 5 of port 0, read on rest
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tca9555_status = i2c_write(0b11011111, I2C_TIMEOUT);
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if (tca9555_status) goto out;
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0b11011111,
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// This means: we will write on pins 0 to 2 on port 1. read rest
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tca9555_status = i2c_write(0b11111000, I2C_TIMEOUT);
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if (tca9555_status) goto out;
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0b11111000,
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};
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tca9555_status = i2c_writeReg(I2C_ADDR, IODIRA, conf, 2, I2C_TIMEOUT);
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out:
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i2c_stop();
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return tca9555_status;
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}
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@ -193,20 +186,14 @@ static matrix_row_t read_cols(uint8_t row) {
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return 0;
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} else {
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uint8_t data = 0;
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uint8_t port0 = 0;
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uint8_t port1 = 0;
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tca9555_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT);
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if (tca9555_status) goto out;
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tca9555_status = i2c_write(IREGP0, I2C_TIMEOUT);
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if (tca9555_status) goto out;
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tca9555_status = i2c_start(I2C_ADDR_READ, I2C_TIMEOUT);
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if (tca9555_status) goto out;
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tca9555_status = i2c_read_ack(I2C_TIMEOUT);
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if (tca9555_status < 0) goto out;
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port0 = (uint8_t)tca9555_status;
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tca9555_status = i2c_read_nack(I2C_TIMEOUT);
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if (tca9555_status < 0) goto out;
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port1 = (uint8_t)tca9555_status;
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uint8_t ports[2] = {0};
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tca9555_status = i2c_readReg(I2C_ADDR, IREGP0, ports, 2, I2C_TIMEOUT);
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if (tca9555_status) { // if there was an error
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// do nothing
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return 0;
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} else {
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uint8_t port0 = ports[0];
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uint8_t port1 = ports[1];
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// The initial state was all ones and any depressed key at a given column for the currently selected row will have its bit flipped to zero.
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// The return value is a row as represented in the generic matrix code were the rightmost bits represent the lower columns and zeroes represent non-depressed keys while ones represent depressed keys.
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@ -219,11 +206,10 @@ static matrix_row_t read_cols(uint8_t row) {
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data = ~(data);
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tca9555_status = I2C_STATUS_SUCCESS;
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out:
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i2c_stop();
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return data;
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}
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}
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}
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}
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static void unselect_rows(void) {
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@ -263,18 +249,10 @@ static void select_row(uint8_t row) {
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default: break;
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}
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tca9555_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT);
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if (tca9555_status) goto out;
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tca9555_status = i2c_write(OREGP0, I2C_TIMEOUT);
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if (tca9555_status) goto out;
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tca9555_status = i2c_write(port0, I2C_TIMEOUT);
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if (tca9555_status) goto out;
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tca9555_status = i2c_write(port1, I2C_TIMEOUT);
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if (tca9555_status) goto out;
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uint8_t ports[2] = {port0, port1};
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tca9555_status = i2c_writeReg(I2C_ADDR, OREGP0, ports, 2, I2C_TIMEOUT);
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// Select the desired row by writing a byte for the entire GPIOB bus where only the bit representing the row we want to select is a zero (write instruction) and every other bit is a one.
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// Note that the row - MATRIX_ROWS_PER_SIDE reflects the fact that being on the right hand, the columns are numbered from MATRIX_ROWS_PER_SIDE to MATRIX_ROWS, but the pins we want to write to are indexed from zero up on the GPIOB bus.
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out:
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i2c_stop();
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}
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}
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}
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@ -35,8 +35,6 @@ extern i2c_status_t tca9555_status;
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// | 0 | 1 | 0 | 0 | A2 | A1 | A0 |
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// | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
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#define I2C_ADDR 0b0100000
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#define I2C_ADDR_WRITE ((I2C_ADDR << 1) | I2C_WRITE)
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#define I2C_ADDR_READ ((I2C_ADDR << 1) | I2C_READ)
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// Register addresses
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#define IODIRA 0x06 // i/o direction register
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@ -64,19 +62,14 @@ uint8_t init_tca9555(void) {
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// - unused : input : 1
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// - input : input : 1
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// - driving : output : 0
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tca9555_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT);
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if (tca9555_status) goto out;
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tca9555_status = i2c_write(IODIRA, I2C_TIMEOUT);
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if (tca9555_status) goto out;
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uint8_t conf[2] = {
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// This means: read all pins of port 0
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tca9555_status = i2c_write(0b11111111, I2C_TIMEOUT);
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if (tca9555_status) goto out;
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0b11111111,
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// This means: we will write on pins 0 to 3 on port 1. read rest
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tca9555_status = i2c_write(0b11110000, I2C_TIMEOUT);
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if (tca9555_status) goto out;
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0b11110000,
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};
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tca9555_status = i2c_writeReg(I2C_ADDR, IODIRA, conf, 2, I2C_TIMEOUT);
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out:
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i2c_stop();
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return tca9555_status;
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}
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@ -194,16 +187,13 @@ static matrix_row_t read_cols(uint8_t row) {
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} else {
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uint8_t data = 0;
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uint8_t port0 = 0;
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tca9555_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT);
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if (tca9555_status) goto out;
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tca9555_status = i2c_write(IREGP0, I2C_TIMEOUT);
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if (tca9555_status) goto out;
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tca9555_status = i2c_start(I2C_ADDR_READ, I2C_TIMEOUT);
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if (tca9555_status) goto out;
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tca9555_status = i2c_read_nack(I2C_TIMEOUT);
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if (tca9555_status < 0) goto out;
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port0 = ~(uint8_t)tca9555_status;
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tca9555_status = i2c_readReg(I2C_ADDR, IREGP0, port0, 1, I2C_TIMEOUT);
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if (tca9555_status) { // if there was an error
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// do nothing
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return 0;
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} else {
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uint8_t port0 = ports[0];
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uint8_t port1 = ports[1];
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// We read all the pins on GPIOA.
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// The initial state was all ones and any depressed key at a given column for the currently selected row will have its bit flipped to zero.
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@ -216,12 +206,10 @@ static matrix_row_t read_cols(uint8_t row) {
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data |= ( port0 & 0x10 ) >> 4;
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tca9555_status = I2C_STATUS_SUCCESS;
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out:
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i2c_stop();
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return data;
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}
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}
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}
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}
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static void unselect_rows(void) {
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@ -256,20 +244,13 @@ static void select_row(uint8_t row) {
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case 4: port1 &= ~(1 << 0); break;
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case 5: port1 &= ~(1 << 1); break;
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case 6: port1 &= ~(1 << 2); break;
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case 7: port1 &= ~(1 << 3); break;
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case 7: port0 &= ~(1 << 5); break;
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default: break;
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}
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tca9555_status = i2c_writeReg(I2C_ADDR, OREGP1, port1, 2, I2C_TIMEOUT);
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// Select the desired row by writing a byte for the entire GPIOB bus where only the bit representing the row we want to select is a zero (write instruction) and every other bit is a one.
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// Note that the row - MATRIX_ROWS_PER_SIDE reflects the fact that being on the right hand, the columns are numbered from MATRIX_ROWS_PER_SIDE to MATRIX_ROWS, but the pins we want to write to are indexed from zero up on the GPIOB bus.
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tca9555_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT);
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if (tca9555_status) goto out;
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tca9555_status = i2c_write(OREGP1, I2C_TIMEOUT);
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if (tca9555_status) goto out;
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tca9555_status = i2c_write(port1, I2C_TIMEOUT);
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if (tca9555_status) goto out;
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out:
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i2c_stop();
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}
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}
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}
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