claunia/86Box
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

I2C overhaul part 3: "we finally figured out NCR NVRAM" edition

Browse Source
This commit is contained in:
RichardG867
2020-11-21 01:36:33 -03:00
parent cf2dba5838
commit d5867928d6
8 changed files with 214 additions and 235 deletions
Download Patch File Download Diff File Expand all files Collapse all files

57
src/device/i2c_gpio.c
View File

@@ -52,19 +52,43 @@ enum {
};
typedef struct {
char *bus_name;
void *i2c;
uint8_t scl, sda, state, slave_state, slave_addr,
slave_rw, last_sda, pos, transmit, byte;
} i2c_gpio_t;
#ifdef ENABLE_I2C_GPIO_LOG
int i2c_gpio_do_log = ENABLE_I2C_GPIO_LOG;
static void
i2c_gpio_log(int level, const char *fmt, ...)
{
va_list ap;
if (i2c_gpio_do_log >= level) {
va_start(ap, fmt);
pclog_ex(fmt, ap);
va_end(ap);
}
}
#else
#define i2c_gpio_log(fmt, ...)
#endif
void *
i2c_gpio_init(char *bus_name)
{
i2c_gpio_t *dev = (i2c_gpio_t *) malloc(sizeof(i2c_gpio_t));
memset(dev, 0, sizeof(i2c_gpio_t));
dev->i2c = i2c_addbus(bus_name);
i2c_gpio_log(1, "I2C GPIO %s: init()\n", bus_name);
dev->bus_name = bus_name;
dev->i2c = i2c_addbus(dev->bus_name);
dev->scl = dev->sda = 1;
dev->slave_addr = 0xff;
@@ -77,6 +101,8 @@ i2c_gpio_close(void *dev_handle)
{
i2c_gpio_t *dev = (i2c_gpio_t *) dev_handle;
i2c_gpio_log(1, "I2C GPIO %s: close()\n", dev->bus_name);
i2c_removebus(dev->i2c);
free(dev);
@@ -87,6 +113,7 @@ void
i2c_gpio_next_byte(i2c_gpio_t *dev)
{
dev->byte = i2c_read(dev->i2c, dev->slave_addr);
i2c_gpio_log(1, "I2C GPIO %s: next_byte() = %02X\n", dev->bus_name, dev->byte);
}
@@ -101,6 +128,8 @@ i2c_gpio_write(i2c_gpio_t *dev)
dev->slave_addr = dev->byte >> 1;
dev->slave_rw = dev->byte & 1;
i2c_gpio_log(1, "I2C GPIO %s: Initiating transfer to address %02X rw %d\n", dev->bus_name, dev->slave_addr, dev->slave_rw);
if (!i2c_has_device(dev->i2c, dev->slave_addr)) {
dev->slave_state = SLAVE_INVALID;
break;
@@ -120,11 +149,13 @@ i2c_gpio_write(i2c_gpio_t *dev)
break;
case SLAVE_RECEIVEADDR:
i2c_gpio_log(1, "I2C GPIO %s: Receiving address %02X\n", dev->bus_name, dev->byte);
i2c_write(dev->i2c, dev->slave_addr, dev->byte);
dev->slave_state = dev->slave_rw ? SLAVE_SENDDATA : SLAVE_RECEIVEDATA;
break;
case SLAVE_RECEIVEDATA:
i2c_gpio_log(1, "I2C GPIO %s: Receiving data %02X\n", dev->bus_name, dev->byte);
i2c_write(dev->i2c, dev->slave_addr, dev->byte);
break;
}
@@ -134,7 +165,10 @@ i2c_gpio_write(i2c_gpio_t *dev)
void
i2c_gpio_stop(i2c_gpio_t *dev)
{
i2c_stop(dev->i2c, dev->slave_addr);
i2c_gpio_log(1, "I2C GPIO %s: Stopping transfer\n", dev->bus_name);
if (dev->slave_addr != 0xff)
i2c_stop(dev->i2c, dev->slave_addr);
dev->slave_addr = 0xff;
dev->slave_state = SLAVE_IDLE;
@@ -149,7 +183,9 @@ i2c_gpio_set(void *dev_handle, uint8_t scl, uint8_t sda)
switch (dev->state) {
case I2C_IDLE:
if (dev->scl && scl && dev->last_sda && !sda) { /* start bit */
/* !dev->scl check breaks NCR SDMS. */
if (/*!dev->scl &&*/ scl && dev->last_sda && !sda) { /* start bit */
i2c_gpio_log(2, "I2C GPIO %s: Start bit received (from IDLE)\n", dev->bus_name);
dev->state = I2C_RECEIVE;
dev->pos = 0;
}
@@ -173,9 +209,11 @@ i2c_gpio_set(void *dev_handle, uint8_t scl, uint8_t sda)
}
} else if (dev->scl && scl) {
if (sda && !dev->last_sda) { /* stop bit */
i2c_gpio_log(2, "I2C GPIO %s: Stop bit received (from RECEIVE)\n", dev->bus_name);
dev->state = I2C_IDLE;
i2c_gpio_stop(dev);
} else if (!sda && dev->last_sda) { /* start bit */
i2c_gpio_log(2, "I2C GPIO %s: Start bit received (from RECEIVE)\n", dev->bus_name);
dev->pos = 0;
dev->slave_state = SLAVE_IDLE;
}
@@ -184,6 +222,7 @@ i2c_gpio_set(void *dev_handle, uint8_t scl, uint8_t sda)
case I2C_ACKNOWLEDGE:
if (!dev->scl && scl) {
i2c_gpio_log(2, "I2C GPIO %s: Acknowledging transfer\n", dev->bus_name);
sda = 0;
dev->pos = 0;
dev->state = (dev->transmit == TRANSMITTER_MASTER) ? I2C_RECEIVE_WAIT : I2C_TRANSMIT;
@@ -193,12 +232,14 @@ i2c_gpio_set(void *dev_handle, uint8_t scl, uint8_t sda)
case I2C_TRANSACKNOWLEDGE:
if (!dev->scl && scl) {
if (sda) { /* not acknowledged; must be end of transfer */
i2c_gpio_log(2, "I2C GPIO %s: End of transfer\n", dev->bus_name);
dev->state = I2C_IDLE;
i2c_gpio_stop(dev);
} else { /* next byte to transfer */
dev->state = I2C_TRANSMIT_START;
i2c_gpio_next_byte(dev);
dev->pos = 0;
i2c_gpio_log(2, "I2C GPIO %s: Next byte = %02X\n", dev->bus_name, dev->byte);
}
}
break;
@@ -208,8 +249,10 @@ i2c_gpio_set(void *dev_handle, uint8_t scl, uint8_t sda)
if (dev->last_sda && !sda) { /* start bit */
i2c_gpio_next_byte(dev);
dev->pos = 0;
i2c_gpio_log(2, "I2C GPIO %s: Next byte = %02X\n", dev->bus_name, dev->byte);
}
if (!dev->last_sda && sda) { /* stop bit */
i2c_gpio_log(2, "I2C GPIO %s: Stop bit received (from TRANSMIT_WAIT)\n", dev->bus_name);
dev->state = I2C_IDLE;
i2c_gpio_stop(dev);
}
@@ -220,6 +263,7 @@ i2c_gpio_set(void *dev_handle, uint8_t scl, uint8_t sda)
if (!dev->scl && scl)
dev->state = I2C_TRANSMIT;
if (dev->scl && scl && !dev->last_sda && sda) { /* stop bit */
i2c_gpio_log(2, "I2C GPIO %s: Stop bit received (from TRANSMIT_START)\n", dev->bus_name);
dev->state = I2C_IDLE;
i2c_gpio_stop(dev);
}
@@ -228,13 +272,18 @@ i2c_gpio_set(void *dev_handle, uint8_t scl, uint8_t sda)
case I2C_TRANSMIT:
if (!dev->scl && scl) {
dev->scl = scl;
if (!dev->pos)
i2c_gpio_log(2, "I2C GPIO %s: Transmit byte %02X\n", dev->bus_name, dev->byte);
dev->sda = sda = dev->byte & 0x80;
i2c_gpio_log(2, "I2C GPIO %s: Transmit bit %02X %d\n", dev->bus_name, dev->byte, dev->pos);
dev->byte <<= 1;
dev->pos++;
return;
}
if (dev->scl && !scl && (dev->pos == 8))
if (dev->scl && !scl && (dev->pos == 8)) {
dev->state = I2C_TRANSACKNOWLEDGE;
i2c_gpio_log(2, "I2C GPIO %s: Acknowledge mode\n", dev->bus_name);
}
break;
}