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-rw-r--r--firmware/microblaze/apps/txrx_uhd.c67
-rw-r--r--firmware/microblaze/lib/i2c.c184
-rw-r--r--firmware/microblaze/lib/i2c.h18
-rw-r--r--firmware/microblaze/lib/u2_init.c14
4 files changed, 259 insertions, 24 deletions
diff --git a/firmware/microblaze/apps/txrx_uhd.c b/firmware/microblaze/apps/txrx_uhd.c
index f0a9702be..30c1a13b4 100644
--- a/firmware/microblaze/apps/txrx_uhd.c
+++ b/firmware/microblaze/apps/txrx_uhd.c
@@ -172,6 +172,25 @@ void handle_udp_data_packet(
#define OTW_GPIO_BANK_TO_NUM(bank) \
(((bank) == USRP2_DIR_RX)? (GPIO_RX_BANK) : (GPIO_TX_BANK))
+ //setup the output data
+static usrp2_ctrl_data_t ctrl_data_out;
+static struct socket_address i2c_src, i2c_dst;
+
+static volatile bool i2c_done = false;
+void i2c_read_done_callback(void) {
+ //printf("I2C read done callback\n");
+ i2c_async_data_ready(ctrl_data_out.data.i2c_args.data);
+ i2c_done = true;
+ i2c_register_callback(0);
+}
+
+void i2c_write_done_callback(void) {
+ //printf("I2C write done callback\n");
+ i2c_done = true;
+ i2c_register_callback(0);
+}
+
+
void handle_udp_ctrl_packet(
struct socket_address src, struct socket_address dst,
unsigned char *payload, int payload_len
@@ -181,9 +200,9 @@ void handle_udp_ctrl_packet(
uint32_t ctrl_data_in_id = ctrl_data_in->id;
//ensure that the protocol versions match
- if (payload_len >= sizeof(uint32_t) && ctrl_data_in->proto_ver != USRP2_FW_COMPAT_NUM){
- printf("!Error in control packet handler: Expected compatibility number %d, but got %d\n",
- USRP2_FW_COMPAT_NUM, ctrl_data_in->proto_ver
+ if (payload_len >= sizeof(uint32_t) && ctrl_data_in->proto_ver != USRP2_PROTO_VERSION){
+ printf("!Error in control packet handler: Expected protocol version %d, but got %d\n",
+ USRP2_PROTO_VERSION, ctrl_data_in->proto_ver
);
ctrl_data_in_id = USRP2_CTRL_ID_WAZZUP_BRO;
}
@@ -197,11 +216,9 @@ void handle_udp_ctrl_packet(
}
//setup the output data
- usrp2_ctrl_data_t ctrl_data_out = {
- .proto_ver = USRP2_FW_COMPAT_NUM,
- .id=USRP2_CTRL_ID_HUH_WHAT,
- .seq=ctrl_data_in->seq
- };
+ ctrl_data_out.proto_ver = USRP2_PROTO_VERSION;
+ ctrl_data_out.id=USRP2_CTRL_ID_HUH_WHAT;
+ ctrl_data_out.seq=ctrl_data_in->seq;
//handle the data based on the id
switch(ctrl_data_in_id){
@@ -212,6 +229,7 @@ void handle_udp_ctrl_packet(
case USRP2_CTRL_ID_WAZZUP_BRO:
ctrl_data_out.id = USRP2_CTRL_ID_WAZZUP_DUDE;
memcpy(&ctrl_data_out.data.ip_addr, get_ip_addr(), sizeof(struct ip_addr));
+ send_udp_pkt(USRP2_UDP_CTRL_PORT, src, &ctrl_data_out, sizeof(ctrl_data_out));
break;
/*******************************************************************
@@ -232,6 +250,7 @@ void handle_udp_ctrl_packet(
ctrl_data_out.data.spi_args.data = result;
ctrl_data_out.id = USRP2_CTRL_ID_OMG_TRANSACTED_SPI_DUDE;
}
+ send_udp_pkt(USRP2_UDP_CTRL_PORT, src, &ctrl_data_out, sizeof(ctrl_data_out));
break;
/*******************************************************************
@@ -239,26 +258,38 @@ void handle_udp_ctrl_packet(
******************************************************************/
case USRP2_CTRL_ID_DO_AN_I2C_READ_FOR_ME_BRO:{
uint8_t num_bytes = ctrl_data_in->data.i2c_args.bytes;
- i2c_read(
+ i2c_register_callback(i2c_read_done_callback);
+ /*i2c_read(
ctrl_data_in->data.i2c_args.addr,
ctrl_data_out.data.i2c_args.data,
num_bytes
+ );*/
+ i2c_async_read(
+ ctrl_data_in->data.i2c_args.addr,
+ num_bytes
);
+ i2c_src = src;
+ i2c_dst = dst;
ctrl_data_out.id = USRP2_CTRL_ID_HERES_THE_I2C_DATA_DUDE;
ctrl_data_out.data.i2c_args.bytes = num_bytes;
}
+ //send_udp_pkt(USRP2_UDP_CTRL_PORT, src, &ctrl_data_out, sizeof(ctrl_data_out)); //TODO: NO
break;
case USRP2_CTRL_ID_WRITE_THESE_I2C_VALUES_BRO:{
uint8_t num_bytes = ctrl_data_in->data.i2c_args.bytes;
- i2c_write(
+ i2c_register_callback(i2c_write_done_callback);
+ i2c_async_write(
ctrl_data_in->data.i2c_args.addr,
ctrl_data_in->data.i2c_args.data,
num_bytes
);
+ i2c_src = src;
+ i2c_dst = dst;
ctrl_data_out.id = USRP2_CTRL_ID_COOL_IM_DONE_I2C_WRITE_DUDE;
ctrl_data_out.data.i2c_args.bytes = num_bytes;
}
+ //send_udp_pkt(USRP2_UDP_CTRL_PORT, src, &ctrl_data_out, sizeof(ctrl_data_out)); //TODO: NO
break;
/*******************************************************************
@@ -287,6 +318,7 @@ void handle_udp_ctrl_packet(
}
ctrl_data_out.id = USRP2_CTRL_ID_OMG_POKED_REGISTER_SO_BAD_DUDE;
+ send_udp_pkt(USRP2_UDP_CTRL_PORT, src, &ctrl_data_out, sizeof(ctrl_data_out));
break;
case USRP2_CTRL_ID_PEEK_AT_THIS_REGISTER_FOR_ME_BRO:
@@ -309,13 +341,15 @@ void handle_udp_ctrl_packet(
}
ctrl_data_out.id = USRP2_CTRL_ID_WOAH_I_DEFINITELY_PEEKED_IT_DUDE;
+ send_udp_pkt(USRP2_UDP_CTRL_PORT, src, &ctrl_data_out, sizeof(ctrl_data_out));
break;
default:
ctrl_data_out.id = USRP2_CTRL_ID_HUH_WHAT;
+ send_udp_pkt(USRP2_UDP_CTRL_PORT, src, &ctrl_data_out, sizeof(ctrl_data_out));
}
- send_udp_pkt(USRP2_UDP_CTRL_PORT, src, &ctrl_data_out, sizeof(ctrl_data_out));
+
}
/*
@@ -441,8 +475,7 @@ main(void)
print_mac_addr(ethernet_mac_addr()->addr);
newline();
print_ip_addr(get_ip_addr()); newline();
- printf("FPGA compatibility number: %d\n", USRP2_FPGA_COMPAT_NUM);
- printf("Firmware compatibility number: %d\n", USRP2_FW_COMPAT_NUM);
+ printf("Control protocol version: %d\n", USRP2_PROTO_VERSION);
ethernet_register_link_changed_callback(link_changed_callback);
ethernet_init();
@@ -481,10 +514,16 @@ main(void)
buffer_irq_handler(0);
+ if(i2c_done) {
+ i2c_done = false;
+ send_udp_pkt(USRP2_UDP_CTRL_PORT, i2c_src, &ctrl_data_out, sizeof(ctrl_data_out));
+ //printf("Sending UDP packet from main loop for I2C...\n");
+ }
+
int pending = pic_regs->pending; // poll for under or overrun
if (pending & PIC_UNDERRUN_INT){
- //dbsm_handle_tx_underrun(&dsp_tx_sm);
+ dbsm_handle_tx_underrun(&dsp_tx_sm);
pic_regs->pending = PIC_UNDERRUN_INT; // clear interrupt
putchar('U');
}
diff --git a/firmware/microblaze/lib/i2c.c b/firmware/microblaze/lib/i2c.c
index 3f738733b..b60a05fcc 100644
--- a/firmware/microblaze/lib/i2c.c
+++ b/firmware/microblaze/lib/i2c.c
@@ -19,12 +19,15 @@
#include "i2c.h"
#include "memory_map.h"
#include "stdint.h"
+#include <string.h>
+#include "pic.h"
+#include "nonstdio.h"
#define MAX_WB_DIV 4 // maximum wishbone divisor (from 100 MHz MASTER_CLK)
// prescaler divisor values for 100 kHz I2C [uses 5 * SCLK internally]
-#define PRESCALER(wb_div) (((MASTER_CLK_RATE/(wb_div)) / (5 * 100000)) - 1)
+#define PRESCALER(wb_div) (((MASTER_CLK_RATE/(wb_div)) / (5 * 400000)) - 1)
static uint16_t prescaler_values[MAX_WB_DIV+1] = {
0xffff, // 0: can't happen
@@ -34,6 +37,18 @@ static uint16_t prescaler_values[MAX_WB_DIV+1] = {
PRESCALER(4), // 4: 25 MHz
};
+//asynchronous (interrupt-driven) i2c state variables
+volatile uint8_t i2c_buf[17]; //tx/rx data transfer buffer
+volatile uint8_t *i2c_bufptr = i2c_buf; //ptr to current position
+volatile uint8_t i2c_len = 0; //length remaining in current transfer
+volatile i2c_state_t i2c_state = I2C_STATE_IDLE; //current I2C transfer state
+i2c_dir_t i2c_dir; //I2C transfer direction
+
+volatile void (*i2c_callback)(void); //function pointer to i2c callback to be called when transaction is complete
+
+static void i2c_irq_handler(unsigned irq);
+inline void i2c_async_err(void);
+
void
i2c_init(void)
{
@@ -47,9 +62,10 @@ i2c_init(void)
i2c_regs->prescaler_lo = prescaler_values[wb_div] & 0xff;
i2c_regs->prescaler_hi = (prescaler_values[wb_div] >> 8) & 0xff;
- i2c_regs->ctrl = I2C_CTRL_EN; // enable core
+ i2c_regs->ctrl = I2C_CTRL_EN; //| I2C_CTRL_IE; // enable core
- // FIXME interrupt driven?
+ // FIXME interrupt driven?
+ pic_register_handler(IRQ_I2C, i2c_irq_handler);
}
static inline void
@@ -107,7 +123,7 @@ i2c_write(unsigned char i2c_addr, const unsigned char *buf, unsigned int len)
i2c_regs->data = (i2c_addr << 1) | 0; // 7 bit address and write bit (0)
// generate START and write addr (and maybe STOP)
- i2c_regs->cmd_status = I2C_CMD_WR | I2C_CMD_START | (len == 0 ? I2C_CMD_STOP : 0);
+ i2c_regs->cmd_status = I2C_CMD_WR | I2C_CMD_START | (len == 0 ? I2C_CMD_STOP : 0);
if (!wait_chk_ack())
goto fail;
@@ -124,4 +140,162 @@ i2c_write(unsigned char i2c_addr, const unsigned char *buf, unsigned int len)
return false;
}
-
+static void i2c_irq_handler(unsigned irq) {
+//i2c state machine.
+
+ //printf("I2C irq handler\n");
+ //first let's make sure nothing is f'ed up
+ if(((i2c_regs->cmd_status & I2C_ST_RXACK) != 0) && i2c_dir == I2C_DIR_WRITE) { //we got a NACK and we didn't send it
+ printf("\tNACK received\n");
+ i2c_async_err();
+ return;
+ }// else printf("\tACK received, proceeding\n");
+
+ if(i2c_regs->cmd_status & I2C_ST_AL) {
+ printf("\tArbitration lost!\n");
+ i2c_async_err();
+ return;
+ }
+
+ if(i2c_regs->cmd_status & I2C_ST_TIP) {
+ //printf("\tI2C still busy in interrupt\n");
+ return;
+ }
+
+ //now decide what to do
+ switch(i2c_state) {
+
+ case I2C_STATE_IDLE:
+ //this is an error. in idle state, we shouldn't be transferring data, and the fact that the IRQ fired is terrible bad.
+ printf("AAAAAHHHHH INTERRUPT IN THE IDLE STATE AAAHHHHHHHHH\n");
+ i2c_async_err();
+ break;
+
+ case I2C_STATE_CONTROL_BYTE_SENT: //here we've sent the control byte, and we're either clocking data in or out now, but we haven't received a byte yet.
+ case I2C_STATE_DATA: //here we're sending/receiving data and if we're receiving there's data in the data reg
+
+ //if(i2c_state == I2C_STATE_DATA) printf("\tI2C in state DATA with dir=%d and len=%d\n", i2c_dir, i2c_len);
+ //else printf("\tI2C in state CONTROL_BYTE_SENT with dir=%d and len=%d\n", i2c_dir, i2c_len);
+
+ if(i2c_dir == I2C_DIR_READ) {
+ if(i2c_state == I2C_STATE_DATA) *(i2c_bufptr++) = i2c_regs->data;
+ //printf("\tRead %x\n", *(i2c_bufptr-1));
+ //set up another data byte
+ if(i2c_len > 1) //only one more byte to transfer
+ i2c_regs->cmd_status = I2C_CMD_RD;
+ else
+ i2c_regs->cmd_status = I2C_CMD_RD | I2C_CMD_NACK | I2C_CMD_STOP;
+ }
+ else if(i2c_dir == I2C_DIR_WRITE) {
+ //write a byte
+ //printf("\tWriting %x\n", *i2c_bufptr);
+ i2c_regs->data = *(i2c_bufptr++);
+ if(i2c_len > 1)
+ i2c_regs->cmd_status = I2C_CMD_WR;
+ else {
+ //printf("\tGenerating STOP\n");
+ i2c_regs->cmd_status = I2C_CMD_WR | I2C_CMD_STOP;
+ }
+ };
+ i2c_len--;
+ if(i2c_len == 0) i2c_state = I2C_STATE_LAST_BYTE;
+ else i2c_state = I2C_STATE_DATA; //takes care of the addr_sent->data transition
+ break;
+
+
+ case I2C_STATE_LAST_BYTE: //here we've already sent the last read request and the last data is waiting for us.
+ //printf("\tI2C in state LAST BYTE\n");
+
+ if(i2c_dir == I2C_DIR_READ) {
+ *(i2c_bufptr++) = i2c_regs->data;
+ //printf("\tRead %x\n", *(i2c_bufptr-1));
+ i2c_state = I2C_STATE_DATA_READY;
+ } else {
+ i2c_state = I2C_STATE_IDLE;
+ }
+ i2c_regs->ctrl &= ~I2C_CTRL_IE; //disable interrupts until next time
+
+ if(i2c_callback) {
+ i2c_callback(); //if we registered a callback, call it!
+ }
+
+ break;
+
+
+ default: //terrible things have happened.
+ printf("you fail at life.\n");
+ }
+
+}
+
+void i2c_register_callback(volatile void (*callback)(void)) {
+ i2c_callback = callback;
+}
+
+inline void i2c_async_err(void) {
+ i2c_state = I2C_STATE_IDLE;
+ i2c_regs->ctrl &= ~I2C_CTRL_IE;
+ printf("I2C error\n");
+//TODO: set an error flag instead of just dropping things on the floor
+ i2c_regs->cmd_status = I2C_CMD_STOP;
+}
+
+bool i2c_async_read(uint8_t addr, unsigned int len) {
+ //printf("Starting async read\n");
+ if(i2c_state != I2C_STATE_IDLE) return false; //sorry mario but your i2c is in another castle
+ if(len == 0) return true; //just idiot-proofing
+ if(len > sizeof(i2c_buf)) return false;
+
+ //disable I2C interrupts and clear pending interrupts on the I2C device
+ i2c_regs->ctrl &= ~I2C_CTRL_IE;
+ i2c_regs->cmd_status |= I2C_CMD_IACK;
+
+ i2c_len = len;
+ i2c_dir = I2C_DIR_READ;
+ i2c_bufptr = i2c_buf;
+ //then set up the transfer by issuing the control byte
+ i2c_regs->ctrl |= I2C_CTRL_IE;
+ i2c_regs->data = (addr << 1) | 0x01; //7 bit addr and read bit
+ i2c_regs->cmd_status = I2C_CMD_WR | I2C_CMD_START; //generate start & start writing addr
+ //update the state so the irq handler knows what's going on
+ i2c_state = I2C_STATE_CONTROL_BYTE_SENT;
+ return true;
+}
+
+bool i2c_async_write(uint8_t addr, const uint8_t *buf, unsigned int len) {
+ //printf("Starting async write\n");
+ if(i2c_state != I2C_STATE_IDLE) return false; //sorry mario but your i2c is in another castle
+ if(len > sizeof(i2c_buf)) return false;
+
+ //disable I2C interrupts and clear pending interrupts on the I2C device
+ i2c_regs->ctrl &= ~I2C_CTRL_IE;
+ i2c_regs->cmd_status |= I2C_CMD_IACK;
+
+ //copy the buffer into our own if writing
+ memcpy(i2c_buf, buf, len);
+
+ i2c_len = len;
+ i2c_dir = I2C_DIR_WRITE;
+ i2c_bufptr = i2c_buf;
+ //then set up the transfer by issuing the control byte
+ i2c_regs->ctrl |= I2C_CTRL_IE;
+ i2c_regs->data = (addr << 1) | 0x00; //7 bit addr and read bit
+ i2c_regs->cmd_status = I2C_CMD_WR | I2C_CMD_START; //generate start & start writing addr
+ //update the state so the irq handler knows what's going on
+ i2c_state = I2C_STATE_CONTROL_BYTE_SENT;
+
+ return true;
+}
+
+//TODO: determine if it's better to read sequentially into the user's buffer, copy on transfer complete, or copy on request (shown below). probably best to copy on request.
+bool i2c_async_data_ready(const void *buf) {
+ if(i2c_state == I2C_STATE_DATA_READY) {
+ i2c_state = I2C_STATE_IDLE;
+ memcpy(buf, i2c_buf, (i2c_bufptr - i2c_buf)); //TODO: not really comfortable with this
+ //printf("Copying %d bytes to user buffer\n", i2c_bufptr-i2c_buf);
+ return true;
+ }
+ return false;
+}
+
+
diff --git a/firmware/microblaze/lib/i2c.h b/firmware/microblaze/lib/i2c.h
index ecb6aa0d2..a991c6ac4 100644
--- a/firmware/microblaze/lib/i2c.h
+++ b/firmware/microblaze/lib/i2c.h
@@ -20,20 +20,38 @@
#define INCLUDED_I2C_H
#include <stdbool.h>
+#include "stdint.h"
+
+typedef enum { I2C_STATE_IDLE,
+ I2C_STATE_CONTROL_BYTE_SENT,
+ I2C_STATE_DATA,
+ I2C_STATE_LAST_BYTE,
+ I2C_STATE_DATA_READY,
+ I2C_STATE_ERROR
+ } i2c_state_t;
+
+typedef enum { I2C_DIR_WRITE=0, I2C_DIR_READ=1 } i2c_dir_t;
void i2c_init(void);
bool i2c_read (unsigned char i2c_addr, unsigned char *buf, unsigned int len);
bool i2c_write(unsigned char i2c_addr, const unsigned char *buf, unsigned int len);
+bool i2c_async_read(uint8_t addr, unsigned int len);
+bool i2c_async_write(uint8_t addr, const uint8_t *buf, unsigned int len);
+bool i2c_async_data_ready(const void *);
+//static void i2c_irq_handler(unsigned irq);
+void i2c_register_callback(void (*callback)(void));
// Write 24LC024 / 24LC025 EEPROM on motherboard or daughterboard.
// Which EEPROM is determined by i2c_addr. See i2c_addr.h
bool eeprom_write (int i2c_addr, int eeprom_offset, const void *buf, int len);
+bool eeprom_write_async (int i2c_addr, int eeprom_offset, const void *buf, int len, void (*callback)(void));
// Read 24LC024 / 24LC025 EEPROM on motherboard or daughterboard.
// Which EEPROM is determined by i2c_addr. See i2c_addr.h
bool eeprom_read (int i2c_addr, int eeprom_offset, void *buf, int len);
+bool eeprom_read_async(int i2c_addr, int eeprom_offset, void *buf, int len, void (*callback)(void));
#endif /* INCLUDED_I2C_H */
diff --git a/firmware/microblaze/lib/u2_init.c b/firmware/microblaze/lib/u2_init.c
index 75bc40859..8d666b76b 100644
--- a/firmware/microblaze/lib/u2_init.c
+++ b/firmware/microblaze/lib/u2_init.c
@@ -45,22 +45,26 @@ get_hw_rev(void)
bool
u2_init(void)
{
+ hal_disable_ints();
hal_io_init();
// init spi, so that we can switch over to the high-speed clock
spi_init();
- // init i2c so we can read our rev
- i2c_init();
- get_hw_rev();
-
// set up the default clocks
clocks_init();
+ hal_uart_init();
+
+ // init i2c so we can read our rev
pic_init(); // progammable interrupt controller
+ i2c_init();
+ hal_enable_ints();
+ get_hw_rev();
+
bp_init(); // buffer pool
- hal_enable_ints();
+
// flash all leds to let us know board is alive
hal_set_leds(0x0, 0x1f);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-29 18:43:01 +0000