mirror of
https://github.com/qmk/qmk_firmware
synced 2024-11-17 17:35:30 +00:00
Merge remote-tracking branch 'origin/master' into develop
This commit is contained in:
QMK Bot
commit
af19461a02
8 changed files with 81 additions and 518 deletions
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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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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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out:
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i2c_stop();
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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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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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// 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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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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}
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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: 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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// 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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uint8_t conf[2] = {
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// This means: read all pins of port 0
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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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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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@ -194,32 +187,27 @@ 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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// 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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// the pins connected to eact columns are sequential, but in reverse order, and counting from zero down (col 5 -> GPIO04, col6 -> GPIO03 and so on).
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data |= ( port0 & 0x01 ) << 4;
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data |= ( port0 & 0x02 ) << 2;
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data |= ( port0 & 0x04 );
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data |= ( port0 & 0x08 ) >> 2;
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data |= ( port0 & 0x10 ) >> 4;
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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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// 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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// the pins connected to eact columns are sequential, but in reverse order, and counting from zero down (col 5 -> GPIO04, col6 -> GPIO03 and so on).
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data |= ( port0 & 0x01 ) << 4;
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data |= ( port0 & 0x02 ) << 2;
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data |= ( port0 & 0x04 );
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data |= ( port0 & 0x08 ) >> 2;
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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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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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@ -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;
|
||||
tca9555_status = i2c_write(port1, I2C_TIMEOUT);
|
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if (tca9555_status) goto out;
|
||||
out:
|
||||
i2c_stop();
|
||||
}
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}
|
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}
|
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|
|
|
|||
|
|
@ -1,178 +0,0 @@
|
|||
#ifndef _I2CMASTER_H
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||||
#define _I2CMASTER_H 1
|
||||
/*************************************************************************
|
||||
* Title: C include file for the I2C master interface
|
||||
* (i2cmaster.S or twimaster.c)
|
||||
* Author: Peter Fleury <pfleury@gmx.ch> http://jump.to/fleury
|
||||
* File: $Id: i2cmaster.h,v 1.10 2005/03/06 22:39:57 Peter Exp $
|
||||
* Software: AVR-GCC 3.4.3 / avr-libc 1.2.3
|
||||
* Target: any AVR device
|
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* Usage: see Doxygen manual
|
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**************************************************************************/
|
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|
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#ifdef DOXYGEN
|
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/**
|
||||
@defgroup pfleury_ic2master I2C Master library
|
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@code #include <i2cmaster.h> @endcode
|
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|
||||
@brief I2C (TWI) Master Software Library
|
||||
|
||||
Basic routines for communicating with I2C slave devices. This single master
|
||||
implementation is limited to one bus master on the I2C bus.
|
||||
|
||||
This I2c library is implemented as a compact assembler software implementation of the I2C protocol
|
||||
which runs on any AVR (i2cmaster.S) and as a TWI hardware interface for all AVR with built-in TWI hardware (twimaster.c).
|
||||
Since the API for these two implementations is exactly the same, an application can be linked either against the
|
||||
software I2C implementation or the hardware I2C implementation.
|
||||
|
||||
Use 4.7k pull-up resistor on the SDA and SCL pin.
|
||||
|
||||
Adapt the SCL and SDA port and pin definitions and eventually the delay routine in the module
|
||||
i2cmaster.S to your target when using the software I2C implementation !
|
||||
|
||||
Adjust the CPU clock frequence F_CPU in twimaster.c or in the Makfile when using the TWI hardware implementaion.
|
||||
|
||||
@note
|
||||
The module i2cmaster.S is based on the Atmel Application Note AVR300, corrected and adapted
|
||||
to GNU assembler and AVR-GCC C call interface.
|
||||
Replaced the incorrect quarter period delays found in AVR300 with
|
||||
half period delays.
|
||||
|
||||
@author Peter Fleury pfleury@gmx.ch http://jump.to/fleury
|
||||
|
||||
@par API Usage Example
|
||||
The following code shows typical usage of this library, see example test_i2cmaster.c
|
||||
|
||||
@code
|
||||
|
||||
#include <i2cmaster.h>
|
||||
|
||||
|
||||
#define Dev24C02 0xA2 // device address of EEPROM 24C02, see datasheet
|
||||
|
||||
int main(void)
|
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{
|
||||
unsigned char ret;
|
||||
|
||||
i2c_init(); // initialize I2C library
|
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|
||||
// write 0x75 to EEPROM address 5 (Byte Write)
|
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i2c_start_wait(Dev24C02+I2C_WRITE); // set device address and write mode
|
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i2c_write(0x05); // write address = 5
|
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i2c_write(0x75); // write value 0x75 to EEPROM
|
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i2c_stop(); // set stop conditon = release bus
|
||||
|
||||
|
||||
// read previously written value back from EEPROM address 5
|
||||
i2c_start_wait(Dev24C02+I2C_WRITE); // set device address and write mode
|
||||
|
||||
i2c_write(0x05); // write address = 5
|
||||
i2c_rep_start(Dev24C02+I2C_READ); // set device address and read mode
|
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|
||||
ret = i2c_readNak(); // read one byte from EEPROM
|
||||
i2c_stop();
|
||||
|
||||
for(;;);
|
||||
}
|
||||
@endcode
|
||||
|
||||
*/
|
||||
#endif /* DOXYGEN */
|
||||
|
||||
/**@{*/
|
||||
|
||||
#if (__GNUC__ * 100 + __GNUC_MINOR__) < 304
|
||||
#error "This library requires AVR-GCC 3.4 or later, update to newer AVR-GCC compiler !"
|
||||
#endif
|
||||
|
||||
#include <avr/io.h>
|
||||
|
||||
/** defines the data direction (reading from I2C device) in i2c_start(),i2c_rep_start() */
|
||||
#define I2C_READ 1
|
||||
|
||||
/** defines the data direction (writing to I2C device) in i2c_start(),i2c_rep_start() */
|
||||
#define I2C_WRITE 0
|
||||
|
||||
|
||||
/**
|
||||
@brief initialize the I2C master interace. Need to be called only once
|
||||
@param void
|
||||
@return none
|
||||
*/
|
||||
extern void i2c_init(void);
|
||||
|
||||
|
||||
/**
|
||||
@brief Terminates the data transfer and releases the I2C bus
|
||||
@param void
|
||||
@return none
|
||||
*/
|
||||
extern void i2c_stop(void);
|
||||
|
||||
|
||||
/**
|
||||
@brief Issues a start condition and sends address and transfer direction
|
||||
|
||||
@param addr address and transfer direction of I2C device
|
||||
@retval 0 device accessible
|
||||
@retval 1 failed to access device
|
||||
*/
|
||||
extern unsigned char i2c_start(unsigned char addr);
|
||||
|
||||
|
||||
/**
|
||||
@brief Issues a repeated start condition and sends address and transfer direction
|
||||
|
||||
@param addr address and transfer direction of I2C device
|
||||
@retval 0 device accessible
|
||||
@retval 1 failed to access device
|
||||
*/
|
||||
extern unsigned char i2c_rep_start(unsigned char addr);
|
||||
|
||||
|
||||
/**
|
||||
@brief Issues a start condition and sends address and transfer direction
|
||||
|
||||
If device is busy, use ack polling to wait until device ready
|
||||
@param addr address and transfer direction of I2C device
|
||||
@return none
|
||||
*/
|
||||
extern void i2c_start_wait(unsigned char addr);
|
||||
|
||||
|
||||
/**
|
||||
@brief Send one byte to I2C device
|
||||
@param data byte to be transfered
|
||||
@retval 0 write successful
|
||||
@retval 1 write failed
|
||||
*/
|
||||
extern unsigned char i2c_write(unsigned char data);
|
||||
|
||||
|
||||
/**
|
||||
@brief read one byte from the I2C device, request more data from device
|
||||
@return byte read from I2C device
|
||||
*/
|
||||
extern unsigned char i2c_readAck(void);
|
||||
|
||||
/**
|
||||
@brief read one byte from the I2C device, read is followed by a stop condition
|
||||
@return byte read from I2C device
|
||||
*/
|
||||
extern unsigned char i2c_readNak(void);
|
||||
|
||||
/**
|
||||
@brief read one byte from the I2C device
|
||||
|
||||
Implemented as a macro, which calls either i2c_readAck or i2c_readNak
|
||||
|
||||
@param ack 1 send ack, request more data from device<br>
|
||||
0 send nak, read is followed by a stop condition
|
||||
@return byte read from I2C device
|
||||
*/
|
||||
extern unsigned char i2c_read(unsigned char ack);
|
||||
#define i2c_read(ack) (ack) ? i2c_readAck() : i2c_readNak();
|
||||
|
||||
|
||||
/**@}*/
|
||||
#endif
|
||||
|
|
@ -243,15 +243,11 @@ static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row)
|
|||
/* if there was an error */
|
||||
return 0;
|
||||
} else {
|
||||
uint16_t data = 0;
|
||||
mcp23018_status = i2c_start(I2C_ADDR_WRITE); if (mcp23018_status) goto out;
|
||||
mcp23018_status = i2c_write(GPIOA); if (mcp23018_status) goto out;
|
||||
mcp23018_status = i2c_start(I2C_ADDR_READ); if (mcp23018_status) goto out;
|
||||
data = i2c_readNak();
|
||||
data = ~data;
|
||||
out:
|
||||
i2c_stop();
|
||||
current_matrix[current_row] |= (data << 8);
|
||||
uint8_t data = 0;
|
||||
mcp23018_status = i2c_readReg(I2C_ADDR, GPIOA, &data, 1, I2C_TIMEOUT);
|
||||
if (!mcp23018_status) {
|
||||
current_matrix[current_row] |= (~((uint16_t)data) << 8);
|
||||
}
|
||||
}
|
||||
|
||||
/* For each col... */
|
||||
|
|
@ -278,11 +274,8 @@ static void select_row(uint8_t row)
|
|||
/* set active row low : 0
|
||||
set active row output : 1
|
||||
set other rows hi-Z : 1 */
|
||||
mcp23018_status = i2c_start(I2C_ADDR_WRITE); if (mcp23018_status) goto out;
|
||||
mcp23018_status = i2c_write(GPIOB); if (mcp23018_status) goto out;
|
||||
mcp23018_status = i2c_write(0xFF & ~(1<<abs(row-4))); if (mcp23018_status) goto out;
|
||||
out:
|
||||
i2c_stop();
|
||||
uint8_t port = 0xFF & ~(1<<abs(row-4));
|
||||
mcp23018_status = i2c_writeReg(I2C_ADDR, GPIOB, &port, 1, I2C_TIMEOUT);
|
||||
}
|
||||
|
||||
uint8_t pin = row_pins[row];
|
||||
|
|
|
|||
|
|
@ -27,5 +27,5 @@ RGBLIGHT_ENABLE = no
|
|||
CUSTOM_MATRIX = yes
|
||||
|
||||
# project specific files
|
||||
SRC = twimaster.c \
|
||||
matrix.c
|
||||
QUANTUM_LIB_SRC += i2c_master.c
|
||||
SRC += matrix.c
|
||||
|
|
|
|||
|
|
@ -1,5 +1,5 @@
|
|||
#include "sx60.h"
|
||||
#include "i2cmaster.h"
|
||||
#include "i2c_master.h"
|
||||
|
||||
|
||||
bool i2c_initialized = 0;
|
||||
|
|
@ -18,21 +18,18 @@ uint8_t init_mcp23018(void) {
|
|||
|
||||
/* B Pins are Row, A pins are Columns
|
||||
Set them to output */
|
||||
mcp23018_status = i2c_start(I2C_ADDR_WRITE); if (mcp23018_status) goto out;
|
||||
mcp23018_status = i2c_write(IODIRA); if (mcp23018_status) goto out;
|
||||
mcp23018_status = i2c_write(0b11111111); if (mcp23018_status) goto out;
|
||||
/* Now write to IODIRB */
|
||||
mcp23018_status = i2c_write(0b00000000); if (mcp23018_status) goto out;
|
||||
i2c_stop();
|
||||
static uint8_t direction[2] = {
|
||||
0b11111111,
|
||||
0b00000000,
|
||||
};
|
||||
static uint8_t pullup[2] = {
|
||||
0b11111111,
|
||||
0b00000000,
|
||||
};
|
||||
|
||||
mcp23018_status = i2c_start(I2C_ADDR_WRITE); if (mcp23018_status) goto out;
|
||||
mcp23018_status = i2c_write(GPPUA); if (mcp23018_status) goto out;
|
||||
mcp23018_status = i2c_write(0b11111111); if (mcp23018_status) goto out;
|
||||
/* Now write to GPPUB */
|
||||
mcp23018_status = i2c_write(0b00000000); if (mcp23018_status) goto out;
|
||||
|
||||
out:
|
||||
i2c_stop();
|
||||
mcp23018_status = i2c_writeReg(I2C_ADDR, IODIRA, direction, 2, I2C_TIMEOUT);
|
||||
if (mcp23018_status) return mcp23018_status;
|
||||
|
||||
mcp23018_status = i2c_writeReg(I2C_ADDR, GPPUA, pullup, 2, I2C_TIMEOUT);
|
||||
return mcp23018_status;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -3,13 +3,12 @@
|
|||
#include "quantum.h"
|
||||
#include <stdint.h>
|
||||
#include <stdbool.h>
|
||||
#include "i2cmaster.h"
|
||||
#include "i2c_master.h"
|
||||
#include <util/delay.h>
|
||||
|
||||
/* I2C aliases and register addresses (see "mcp23018.md") */
|
||||
#define I2C_ADDR 0b0100000
|
||||
#define I2C_ADDR_WRITE ( (I2C_ADDR<<1) | I2C_WRITE )
|
||||
#define I2C_ADDR_READ ( (I2C_ADDR<<1) | I2C_READ )
|
||||
#define I2C_TIMEOUT 100
|
||||
#define IODIRA 0x00 /* i/o direction register */
|
||||
#define IODIRB 0x01
|
||||
#define GPPUA 0x0C /* GPIO pull-up resistor register */
|
||||
|
|
|
|||
|
|
@ -1,207 +0,0 @@
|
|||
/*************************************************************************
|
||||
* Title: I2C master library using hardware TWI interface
|
||||
* Author: Peter Fleury <pfleury@gmx.ch> http://jump.to/fleury
|
||||
* File: $Id: twimaster.c,v 1.3 2005/07/02 11:14:21 Peter Exp $
|
||||
* Software: AVR-GCC 3.4.3 / avr-libc 1.2.3
|
||||
* Target: any AVR device with hardware TWI
|
||||
* Usage: API compatible with I2C Software Library i2cmaster.h
|
||||
**************************************************************************/
|
||||
#include <inttypes.h>
|
||||
#include <compat/twi.h>
|
||||
|
||||
#include <i2cmaster.h>
|
||||
|
||||
/* define CPU frequency in Hz here if not defined in Makefile */
|
||||
#ifndef F_CPU
|
||||
#define F_CPU 16000000UL
|
||||
#endif
|
||||
|
||||
/* I2C clock in Hz */
|
||||
#define SCL_CLOCK 400000L
|
||||
|
||||
|
||||
/*************************************************************************
|
||||
Initialization of the I2C bus interface. Need to be called only once
|
||||
*************************************************************************/
|
||||
void i2c_init(void)
|
||||
{
|
||||
/* initialize TWI clock
|
||||
* minimal values in Bit Rate Register (TWBR) and minimal Prescaler
|
||||
* bits in the TWI Status Register should give us maximal possible
|
||||
* I2C bus speed - about 444 kHz
|
||||
*
|
||||
* for more details, see 20.5.2 in ATmega16/32 secification
|
||||
*/
|
||||
|
||||
TWSR = 0; /* no prescaler */
|
||||
TWBR = 10; /* must be >= 10 for stable operation */
|
||||
|
||||
}/* i2c_init */
|
||||
|
||||
|
||||
/*************************************************************************
|
||||
Issues a start condition and sends address and transfer direction.
|
||||
return 0 = device accessible, 1= failed to access device
|
||||
*************************************************************************/
|
||||
unsigned char i2c_start(unsigned char address)
|
||||
{
|
||||
uint8_t twst;
|
||||
|
||||
/* send START condition */
|
||||
TWCR = (1<<TWINT) | (1<<TWSTA) | (1<<TWEN);
|
||||
|
||||
/* wait until transmission completed */
|
||||
while(!(TWCR & (1<<TWINT)));
|
||||
|
||||
/* check value of TWI Status Register. Mask prescaler bits. */
|
||||
twst = TW_STATUS & 0xF8;
|
||||
if ( (twst != TW_START) && (twst != TW_REP_START)) return 1;
|
||||
|
||||
/* send device address */
|
||||
TWDR = address;
|
||||
TWCR = (1<<TWINT) | (1<<TWEN);
|
||||
|
||||
/* wail until transmission completed and ACK/NACK has been received */
|
||||
while(!(TWCR & (1<<TWINT)));
|
||||
|
||||
/* check value of TWI Status Register. Mask prescaler bits. */
|
||||
twst = TW_STATUS & 0xF8;
|
||||
if ( (twst != TW_MT_SLA_ACK) && (twst != TW_MR_SLA_ACK) ) return 1;
|
||||
|
||||
return 0;
|
||||
|
||||
}/* i2c_start */
|
||||
|
||||
|
||||
/*************************************************************************
|
||||
Issues a start condition and sends address and transfer direction.
|
||||
If device is busy, use ack polling to wait until device is ready
|
||||
|
||||
Input: address and transfer direction of I2C device
|
||||
*************************************************************************/
|
||||
void i2c_start_wait(unsigned char address)
|
||||
{
|
||||
uint8_t twst;
|
||||
|
||||
|
||||
while ( 1 )
|
||||
{
|
||||
/* send START condition */
|
||||
TWCR = (1<<TWINT) | (1<<TWSTA) | (1<<TWEN);
|
||||
|
||||
/* wait until transmission completed */
|
||||
while(!(TWCR & (1<<TWINT)));
|
||||
|
||||
/* check value of TWI Status Register. Mask prescaler bits. */
|
||||
twst = TW_STATUS & 0xF8;
|
||||
if ( (twst != TW_START) && (twst != TW_REP_START)) continue;
|
||||
|
||||
/* send device address */
|
||||
TWDR = address;
|
||||
TWCR = (1<<TWINT) | (1<<TWEN);
|
||||
|
||||
/* wail until transmission completed */
|
||||
while(!(TWCR & (1<<TWINT)));
|
||||
|
||||
/* check value of TWI Status Register. Mask prescaler bits. */
|
||||
twst = TW_STATUS & 0xF8;
|
||||
if ( (twst == TW_MT_SLA_NACK )||(twst ==TW_MR_DATA_NACK) )
|
||||
{
|
||||
/* device busy, send stop condition to terminate write operation */
|
||||
TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO);
|
||||
|
||||
/* wait until stop condition is executed and bus released */
|
||||
while(TWCR & (1<<TWSTO));
|
||||
|
||||
continue;
|
||||
}
|
||||
|
||||
break;
|
||||
}
|
||||
|
||||
}/* i2c_start_wait */
|
||||
|
||||
|
||||
/*************************************************************************
|
||||
Issues a repeated start condition and sends address and transfer direction
|
||||
|
||||
Input: address and transfer direction of I2C device
|
||||
|
||||
Return: 0 device accessible
|
||||
1 failed to access device
|
||||
*************************************************************************/
|
||||
unsigned char i2c_rep_start(unsigned char address)
|
||||
{
|
||||
return i2c_start( address );
|
||||
|
||||
}/* i2c_rep_start */
|
||||
|
||||
|
||||
/*************************************************************************
|
||||
Terminates the data transfer and releases the I2C bus
|
||||
*************************************************************************/
|
||||
void i2c_stop(void)
|
||||
{
|
||||
/* send stop condition */
|
||||
TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO);
|
||||
|
||||
/* wait until stop condition is executed and bus released */
|
||||
while(TWCR & (1<<TWSTO));
|
||||
|
||||
}/* i2c_stop */
|
||||
|
||||
|
||||
/*************************************************************************
|
||||
Send one byte to I2C device
|
||||
|
||||
Input: byte to be transfered
|
||||
Return: 0 write successful
|
||||
1 write failed
|
||||
*************************************************************************/
|
||||
unsigned char i2c_write( unsigned char data )
|
||||
{
|
||||
uint8_t twst;
|
||||
|
||||
/* send data to the previously addressed device */
|
||||
TWDR = data;
|
||||
TWCR = (1<<TWINT) | (1<<TWEN);
|
||||
|
||||
/* wait until transmission completed */
|
||||
while(!(TWCR & (1<<TWINT)));
|
||||
|
||||
/* check value of TWI Status Register. Mask prescaler bits */
|
||||
twst = TW_STATUS & 0xF8;
|
||||
if( twst != TW_MT_DATA_ACK) return 1;
|
||||
return 0;
|
||||
|
||||
}/* i2c_write */
|
||||
|
||||
|
||||
/*************************************************************************
|
||||
Read one byte from the I2C device, request more data from device
|
||||
|
||||
Return: byte read from I2C device
|
||||
*************************************************************************/
|
||||
unsigned char i2c_readAck(void)
|
||||
{
|
||||
TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWEA);
|
||||
while(!(TWCR & (1<<TWINT)));
|
||||
|
||||
return TWDR;
|
||||
|
||||
}/* i2c_readAck */
|
||||
|
||||
|
||||
/*************************************************************************
|
||||
Read one byte from the I2C device, read is followed by a stop condition
|
||||
|
||||
Return: byte read from I2C device
|
||||
*************************************************************************/
|
||||
unsigned char i2c_readNak(void)
|
||||
{
|
||||
TWCR = (1<<TWINT) | (1<<TWEN);
|
||||
while(!(TWCR & (1<<TWINT)));
|
||||
|
||||
return TWDR;
|
||||
|
||||
}/* i2c_readNak */
|
||||
Loading…
Reference in a new issue