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https://xff.cz/git/pinephone-keyboard/
synced 2024-11-09 14:05:43 +01:00
fw: Change to bit-banging I2C implementation for charger comm
New code, compiles, but it's not tested yet!
This commit is contained in:
parent
4a1abce0eb
commit
574d68aa89
2 changed files with 189 additions and 148 deletions
329
firmware/main.c
329
firmware/main.c
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@ -36,9 +36,6 @@
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#ifndef CONFIG_STOCK_FW
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#define CONFIG_STOCK_FW 1
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#endif
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#ifndef CONFIG_I2C_A
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#define CONFIG_I2C_A 0
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#endif
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#define USB_DEBUG 0
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@ -496,32 +493,18 @@ static uint8_t keyscan_scan(uint8_t* res)
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static void ext_int_assert(void)
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{
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#if CONFIG_I2C_A
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// modded prototype 3 POGO INT pin
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P84 = 0;
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PAGESW = 0;
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P0_P8M0 &= ~BIT(4); // output
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#else
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// original prototype POGO INT pin
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// POGO INT pin
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P90 = 0;
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PAGESW = 1;
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P1_P9M0 &= ~BIT(0);
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#endif
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}
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static void ext_int_deassert(void)
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{
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#if CONFIG_I2C_A
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// modded prototype 3 POGO INT pin
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P84 = 0;
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PAGESW = 0;
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P0_P8M0 |= BIT(4); // input
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#else
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// original prototype POGO INT pin
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// POGO INT pin
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P90 = 0;
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PAGESW = 1;
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P1_P9M0 |= BIT(0);
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#endif
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}
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// }}}
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@ -602,9 +585,6 @@ static volatile uint8_t __idata ro_regs[REG_KEYMATRIX_STATE_END + 1] = {
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#endif
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#if CONFIG_STOCK_FW
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REG_FW_FEATURES_STOCK_FW |
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#endif
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#if CONFIG_I2C_A
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REG_FW_FEATURES_I2CA |
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#endif
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0,
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[REG_KEYMATRIX_SIZE] = 0xc6, // 12 x 6
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@ -983,151 +963,215 @@ static void self_test_run(void)
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#endif
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// }}}
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// {{{ I2C A forwarding
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#if CONFIG_I2C_A
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// {{{ Charger I2C bitbanging
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#define CHARGER_ADDR 0x75u
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// returns 1 on success
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static __bit poll_flag(uint8_t flag)
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// Inspired by: https://calcium3000.wordpress.com/2016/08/19/i2c-bit-banging-tutorial-part-i/
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// TODO: recognize clock-stretching
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#define CHG_SCL BIT(5)
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#define CHG_SDA BIT(6)
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#define CHG_INT BIT(7)
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#define CHG_PORT P8
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#define CHG_RELEASE_SCL P0_P8M0 &= ~CHG_SCL
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#define CHG_PULL_SCL P0_P8M0 |= CHG_SCL
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#define CHG_RELEASE_SDA P0_P8M0 &= ~CHG_SDA
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#define CHG_PULL_SDA P0_P8M0 |= CHG_SDA
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void i2c_init(void)
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{
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// set timeout for the duration of single transfer at 100kHz + some
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// slack for slave clock stretching
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PAGESW = 0;
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P0_P8M0 |= CHG_SCL | CHG_SDA | CHG_INT; // set SCL/SDA to input (release I2C bus)
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P8 &= ~(CHG_SCL | CHG_SDA); // set SCL/SDA to output low when changed to output mode
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}
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// returns 1 on busy/timeout, abort needed because the bus is locked
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static __bit poll_scl_busy(void)
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{
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// timeout for clock stretching by the slave
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T0_SET_TIMEOUT(2 * 250); // 250us
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while (!TF0) {
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if (P0_I2CASF & flag) {
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P0_I2CASF &= ~flag;
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return 1;
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}
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while (!TF0)
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if (CHG_PORT & CHG_SCL)
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return 0;
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return 1;
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}
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void i2c_start_condition(void)
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{
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CHG_RELEASE_SCL;
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CHG_RELEASE_SDA;
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delay_us(5);
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CHG_PULL_SDA;
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delay_us(5);
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CHG_PULL_SCL;
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delay_us(5);
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}
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void i2c_stop_condition(void)
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{
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CHG_PULL_SDA;
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delay_us(5);
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CHG_RELEASE_SCL;
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delay_us(5);
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CHG_RELEASE_SDA;
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delay_us(5);
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}
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void i2c_write_bit(__bit b)
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{
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if (b)
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CHG_RELEASE_SDA;
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else
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CHG_PULL_SDA;
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delay_us(5);
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CHG_RELEASE_SCL;
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delay_us(5);
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CHG_PULL_SCL;
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}
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__bit i2c_read_bit(void)
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{
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__bit b;
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CHG_RELEASE_SDA;
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delay_us(5);
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CHG_RELEASE_SCL;
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delay_us(5);
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if (CHG_PORT & CHG_SDA)
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b = 1;
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else
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b = 0;
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CHG_PULL_SCL;
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return b;
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}
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__bit i2c_write_byte(uint8_t data)
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{
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uint8_t i;
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// write data
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for (i = 0; i < 8; i++) {
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i2c_write_bit(data & 0x80); // write the most-significant bit
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data <<= 1;
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}
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return 0;
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// read ack bit
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return i2c_read_bit();
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}
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uint8_t i2c_read_byte(__bit ack)
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{
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uint8_t data = 0;
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uint8_t i;
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// read data
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for (i = 0; i < 8; i++) {
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data <<= 1;
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data |= i2c_read_bit();
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}
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// send ack
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i2c_write_bit(!ack);
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return data;
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}
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__bit i2c_write_reg(uint8_t reg, uint8_t data)
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{
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__bit ok = 0;
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PAGESW = 0;
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i2c_start_condition();
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if (!i2c_write_byte(CHARGER_ADDR << 1))
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goto stop;
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if (!i2c_write_byte(reg))
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goto stop;
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if (!i2c_write_byte(data))
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goto stop;
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ok = 1;
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stop:
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i2c_stop_condition();
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return ok;
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}
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__bit i2c_read_reg(uint8_t reg, uint8_t* data)
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{
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__bit ok = 0;
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PAGESW = 0;
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i2c_start_condition();
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if (!i2c_write_byte(CHARGER_ADDR << 1))
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goto stop;
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if (!i2c_write_byte(reg))
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goto stop;
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// repeated start
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i2c_start_condition();
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if (!i2c_write_byte((CHARGER_ADDR << 1) | 0x01))
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goto stop;
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*data = i2c_read_byte(0);
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ok = 1;
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stop:
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i2c_stop_condition();
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return ok;
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}
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static __bit charger_is_woke(void)
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{
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PAGESW = 1;
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P1_PHCON2 |= BIT(3); // pull-up on P87-P84
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PAGESW = 0;
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P0_P8M0 |= BIT(7); // input
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return !P87;
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}
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static __bit i2c_a_send_addr(uint8_t addr)
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static uint8_t charger_read(void)
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{
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P0_I2CASA = addr;
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P0_I2CACR1 |= BIT(7); // strobe
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if (!poll_flag(BIT(0)))
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return 0;
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if (!(P0_I2CACR1 & BIT(2))) // ACK
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return 0;
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return 1;
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}
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static __bit i2c_a_send_data(uint8_t data)
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{
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P0_I2CADB = data;
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P0_I2CACR1 |= BIT(7); // strobe
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if (!poll_flag(BIT(0)))
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return 0;
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if (!(P0_I2CACR1 & BIT(2))) // ACK
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return 0;
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return 1;
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}
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static void i2c_a_stop(void)
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{
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P0_I2CACR1 |= BIT(4); // stop
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poll_flag(BIT(2));
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// and finaly do a reset just in case
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P0_I2CACR2 &= ~BIT(5);
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P0_I2CACR2 |= BIT(5);
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}
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static uint8_t i2c_a_read(void)
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{
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uint8_t status = 0xff;
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// reset FSM
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P0_I2CACR2 &= ~BIT(5);
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P0_I2CACR2 |= BIT(5);
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if (!charger_is_woke())
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return 0xff;
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if (!i2c_a_send_addr(CHARGER_ADDR))
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goto err;
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if (!i2c_read_reg(REG_SYS(CHG_ADDR), ®_SYS(CHG_DATA)))
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return 0xff;
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if (!i2c_a_send_data(REG_SYS(I2CA_ADDR)))
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goto err;
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if (!i2c_a_send_addr(CHARGER_ADDR | BIT(0)))
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goto err;
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P0_I2CACR1 |= BIT(7) | BIT(4); // strobe + stop
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if (!poll_flag(BIT(2))) // poll for stop bit
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goto err;
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// read received data
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REG_SYS(I2CA_DATA) = P0_I2CBDB;
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return 0;;
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err:
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i2c_a_stop();
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return status;
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return 0;
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}
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static uint8_t i2c_a_write(void)
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static uint8_t charger_write(void)
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{
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uint8_t status = 0xff;
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// reset FSM
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P0_I2CACR2 &= ~BIT(5);
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P0_I2CACR2 |= BIT(5);
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if (!charger_is_woke())
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return 0xff;
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if (!i2c_a_send_addr(CHARGER_ADDR))
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goto err;
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if (!i2c_write_reg(REG_SYS(CHG_ADDR), REG_SYS(CHG_DATA)))
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return 0xff;
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if (!i2c_a_send_data(REG_SYS(I2CA_ADDR)))
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goto err;
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if (!i2c_a_send_data(REG_SYS(I2CA_DATA)))
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goto err;
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status = 0;
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err:
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i2c_a_stop();
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return status;
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return 0;
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}
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static void i2c_a_init(void)
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static void charger_init(void)
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{
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PAGESW = 0;
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// un-powerdown I2CA
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P0_DEVPD2 &= ~BIT(0);
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P0_I2CACR1 = BIT(6); // master mode
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P0_I2CACR2 = BIT(5) | 0x07 << 1 | BIT(0); // 100kHz mode, enable
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i2c_init();
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}
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#endif
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// }}}
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// {{{ System commands
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@ -1148,12 +1192,10 @@ static void exec_system_command(void)
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#endif
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} else if (REG_SYS(COMMAND) == REG_SYS_COMMAND_USB_IAP) {
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jump_to_usb_bootloader = 1;
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#if CONFIG_I2C_A
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} else if (REG_SYS(COMMAND) == REG_SYS_COMMAND_I2CA_READ) {
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REG_SYS(COMMAND) = i2c_a_read();
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} else if (REG_SYS(COMMAND) == REG_SYS_COMMAND_I2CA_WRITE) {
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REG_SYS(COMMAND) = i2c_a_write();
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#endif
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} else if (REG_SYS(COMMAND) == REG_SYS_COMMAND_CHG_READ) {
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REG_SYS(COMMAND) = charger_read();
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} else if (REG_SYS(COMMAND) == REG_SYS_COMMAND_CHG_WRITE) {
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REG_SYS(COMMAND) = charger_write();
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} else {
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REG_SYS(COMMAND) = 0xff;
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goto out_done;
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@ -1917,9 +1959,8 @@ void main(void)
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puts("ppkb firmware " FW_REVISION_STR " (user)\n");
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#endif
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#if CONFIG_I2C_A
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i2c_a_init();
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#endif
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charger_init();
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i2c_slave_init();
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T1_SET_TIMEOUT(40000);
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@ -42,15 +42,15 @@
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#define REG_SYS_CONFIG 0x20
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#define REG_SYS_CONFIG_SCAN_BLOCK BIT(0)
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#define REG_SYS_I2CA_ADDR 0x21
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#define REG_SYS_I2CA_DATA 0x22
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#define REG_SYS_CHG_DATA 0x22
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#define REG_SYS_CHG_ADDR 0x21
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#define REG_SYS_COMMAND 0x23
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#define REG_SYS_COMMAND_MCU_RESET 'r'
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#define REG_SYS_COMMAND_USB_IAP 'i'
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#define REG_SYS_COMMAND_SELFTEST 't'
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#define REG_SYS_COMMAND_I2CA_READ 0x91
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#define REG_SYS_COMMAND_I2CA_WRITE 0xA1
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#define REG_SYS_COMMAND_CHG_READ 0x91
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#define REG_SYS_COMMAND_CHG_WRITE 0xA1
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#define REG_SYS_USER_APP_BLOCK 0x24
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#define REG_SYS_USER_APP_BLOCK_MAGIC 0x53
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