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updated mcp23018 stuff for dox's PCB

partial-rewrite
Ben Blazak 2012-05-26 23:12:01 -07:00
parent 1af2423364
commit a28b1f1182
2 changed files with 23 additions and 23 deletions
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40
src/keyboard/ergodox/mcp23018.c
View File

@ -44,26 +44,26 @@ uint8_t mcp23018_init(void) {
// set pin direction
// - unused : input : 1
// - rows : output : 0
// - columns : input : 1
// - row : input : 1
// - column : output : 0
twi_start();
ret = twi_send(TWI_ADDR_WRITE);
if (ret) goto out; // make sure we got an ACK
twi_send(IODIRA);
twi_send(0b11000000); // IODIRA
twi_send(0b11111111); // IODIRB
twi_send(0b11111111); // IODIRA
twi_send(0b10000000); // IODIRB
twi_stop();
// set pull-up
// - unused : on : 1
// - rows : off : 0
// - columns : on : 1
// - rows : on : 1
// - columns : off : 0
twi_start();
ret = twi_send(TWI_ADDR_WRITE);
if (ret) goto out; // make sure we got an ACK
twi_send(GPPUA);
twi_send(0b11000000); // GPPUA
twi_send(0b11111111); // GPPUB
twi_send(0b11111111); // GPPUA
twi_send(0b10000000); // GPPUB
twi_stop();
// set logical value (doesn't matter on inputs)
@ -109,34 +109,34 @@ uint8_t mcp23018_update_matrix(bool matrix[KB_ROWS][KB_COLUMNS]) {
}
// update our part of the matrix
for (uint8_t row=0x6; row<=0xB; row++) {
// set active row low : 0
// set other rows high (hi-Z) : 1
for (uint8_t col=0; col<=6; col++) {
// set active column low : 0
// set other columns high (hi-Z) : 1
twi_start();
twi_send(TWI_ADDR_WRITE);
twi_send(OLATA);
twi_send( 0b11111111 & ~(1<<(row-6)) );
twi_send(OLATB);
twi_send( 0xFF & ~(1<<col) );
twi_stop();
// read column data
// read row data
twi_start();
twi_send(TWI_ADDR_WRITE);
twi_send(GPIOB);
twi_send(GPIOA);
twi_start();
twi_send(TWI_ADDR_READ);
twi_read(&data);
twi_stop();
// update matrix
for (uint8_t col=0; col<=6; col++)
matrix[row][col] = !( data & (1<<col) );
for (uint8_t row=0x6; row<=0xB; row++)
matrix[row][col] = !( data & (1<<(row-6)) );
}
// set all rows high (hi-Z) : 1
// set all columns high (hi-Z) : 1
twi_start();
twi_send(TWI_ADDR_WRITE);
twi_send(GPIOA);
twi_send(0b11111111);
twi_send(GPIOB);
twi_send(0xFF);
twi_stop();
return ret; // success

6
src/keyboard/ergodox/mcp23018.md
View File

@ -80,9 +80,9 @@
* notes:
* All addresses given for IOCON.BANK = 0, since that's the default value of
the bit, and that's what we'll be using.
* We want the row pins set as output high (hi-Z) without pull-ups
initially, and the column pins set as input with pull-ups. We'll cycle
through driving the row pins low and checking the column pins in the
* We want the column pins set as output high (hi-Z) without pull-ups
initially, and the row pins set as input with pull-ups. We'll cycle
through driving the column pins low and checking the row pins in the
update function.
* abbreviations: