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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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// 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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// 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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out: |
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i2c_stop(); |
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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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0b11011111, |
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// This means: we will write on pins 0 to 2 on port 1. read rest |
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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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return tca9555_status; |
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} |
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@ -192,36 +185,29 @@ static matrix_row_t read_cols(uint8_t row) { |
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if (tca9555_status) { // if there was an error |
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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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// 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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// Since the pins are not ordered sequentially, we have to build the correct dataset from the two ports. Refer to the schematic to see where every pin is connected. |
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data |= ( port0 & 0x01 ); |
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data |= ( port0 & 0x02 ); |
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data |= ( port1 & 0x10 ) >> 2; |
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data |= ( port1 & 0x08 ); |
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data |= ( port0 & 0x40 ) >> 2; |
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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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uint8_t data = 0; |
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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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// Since the pins are not ordered sequentially, we have to build the correct dataset from the two ports. Refer to the schematic to see where every pin is connected. |
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data |= ( port0 & 0x01 ); |
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data |= ( port0 & 0x02 ); |
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data |= ( port1 & 0x10 ) >> 2; |
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data |= ( port1 & 0x08 ); |
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data |= ( port0 & 0x40 ) >> 2; |
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data = ~(data); |
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tca9555_status = I2C_STATUS_SUCCESS; |
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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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@ -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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} |