1 files changed, 62 insertions, 0 deletions
diff --git a/src/br24t_eeprom_driver.c b/src/br24t_eeprom_driver.c
new file mode 100644
index 0000000..53165d3
--- /dev/null
+++ b/src/br24t_eeprom_driver.c
@@ -0,0 +1,62 @@
+#include <stdio.h>
+#include "i2c.h"
+#include "br24t_eeprom_driver.h"
+
+#define EEPROM_ADDR       0x57
+#define EEPROM_PAGE_SIZE  64
+
+//for burning eeprom
+#define MAGIC_SYN         0xdeadbeef
+#define MAGIC_ACK         0xf00dd00d
+
+#define PAGE_WRITE_OK                 0x00
+#define PAGE_WRITE_CORRUPTED          0x01
+#define PAGE_WRITE_UNKNOWN_ERROR      0xff
+
+//we need another function cause it's got a 16 bit register address
+
+#ifdef FLASH_EEPROM
+void flash_eeprom() {
+  uint16_t data_len;
+  uint32_t syn = 0;
+  uint8_t on_byte;
+  uint8_t eeprom_buffer_out[EEPROM_PAGE_SIZE]; 
+  uint8_t eeprom_buffer_in[EEPROM_PAGE_SIZE];
+
+  while(syn != MAGIC_SYN) fread(&syn, 4, 1, stdin); //not sure we _really_ need to do this?
+  
+  //this feels ugly
+  syn = MAGIC_ACK;
+  fwrite(&syn, 4, 1, stdout);
+  
+  //get amount of data we'll be using
+  data_len = uart_recvbyte();
+  data_len |= (uart_recvbyte() >> 8);
+
+  for(int page = 0; page < (data_len / EEPROM_PAGE_SIZE); data_len -= EEPROM_PAGE_SIZE) {
+
+    fread(eeprom_buffer_out, EEPROM_PAGE_SIZE, 1, stdin);
+
+    i2c_start(EEPROM_I2C_ADDR, I2C_READ);
+    i2c_send((uint8_t)(page * EEPROM_PAGE_SIZE) & 0xff);
+    i2c_send((uint8_t)(page * EEPROM_PAGE_SIZE) >> 8);
+    for(on_byte = 0; on_byte < EEPROM_PAGE_SIZE; on_byte++) 
+      i2c_send(eeprom_buffer_out[on_byte]); 
+    i2c_stop();
+
+    //verify
+    eeprom_buffer_in[0] = EEPROM_READBYTE(page * EEPROM_PAGE_SIZE);
+    //eeprom_buffer_in[0] = i2c_read_reg_addr16(EEPROM_I2C_ADDR, page * EEPROM_PAGE_SIZE);
+    i2c_start(EEPROM_I2C_ADDR, I2C_READ);
+    for(on_byte = 1; on_byte < EEPROM_PAGE_SIZE; on_byte++)
+      eeprom_buffer_in[on_byte] = i2c_recv();
+    i2c_stop();
+
+    if(memcmp(eeprom_buffer_in, eeprom_buffer_out, EEPROM_PAGE_SIZE)) {
+      fputc(PAGE_WRITE_CORRUPTED, stdout);
+      error();
+    }
+    fputc(PAGE_WRITE_OK, stdout);
+  }
+}
+#endif