From d0801b36b47d8f3da610597160fde92059fd7e62 Mon Sep 17 00:00:00 2001
From: Nao Pross <naopross@thearcway.org>
Date: Mon, 7 Aug 2017 19:27:05 +0200
Subject: implementation for avr programmer

the programmer will receive the binary in blocks of defined size
by a program under sw/programmer/linux (moved from sw/linux).
---
 sw/programmer/avr/main.c | 109 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 sw/programmer/avr/main.c

(limited to 'sw/programmer/avr/main.c')

diff --git a/sw/programmer/avr/main.c b/sw/programmer/avr/main.c
new file mode 100644
index 0000000..90d05fa
--- /dev/null
+++ b/sw/programmer/avr/main.c
@@ -0,0 +1,109 @@
+#include "fileinfo.h"
+#include "usart.h"
+#include <util/delay.h>
+
+#define EEPROM_TICK_MS  10
+
+#define ADDRCR      PORTB
+#define EEPROMCR    PORTC
+#define EEPROMDR    PORTD
+
+#define ADDR_BIT    0
+#define ADDR_EL     3
+#define ADDR_EH     4
+#define ADDR_DL     5
+#define ADDR_DH     6
+
+#define EEPROM_WR   0
+#define EEPROM_RD   1
+#define EEPROM_CLK  2
+
+
+void eeprom_write(uint16_t addr, uint8_t byte);
+void eeprom_tick();
+
+int main(void)
+{
+    uint8_t *buffer, i;
+    uint16_t addr;
+    size_t read;
+
+    struct file_info *finfo =  malloc(sizeof(struct file_info));
+
+    DDRB = 0x7F;
+    DDRC = 0x83;
+    DDRD = 0xFC;
+
+    /* get configuration */
+    usart_init(1200); 
+
+    usart_print("EEPROM Programmer\n\r");
+
+    do {
+        usart_print("Waiting for configuration\n\r");
+        read = usart_read((uint8_t *) finfo, sizeof(struct file_info));
+    } while (read != sizeof(struct file_info));
+
+    usart_print("Programmer Ready\n<waiting for binary>\n\r");
+
+    buffer = malloc(finfo->blklen);
+    addr = finfo->start_addr;
+
+    /* read file */
+    while ((read = usart_read(buffer, finfo->blklen))) {
+        for (i = 0; i < read; i++) {
+            eeprom_write(addr + i, *(buffer++));
+        }
+
+        addr += finfo->blklen;
+    }
+
+    return 0;
+}
+
+
+void eeprom_write(uint16_t addr, uint8_t byte)
+{
+    int bit;
+
+    /* set address */
+    for (bit = 0; bit < 8; bit++) {
+        // clear bit
+        ADDRCR &= ~0x07;
+        // select the bit
+        ADDRCR |= bit;
+
+        // write bit for lower byte
+        if (addr & _BV(bit))
+            ADDRCR |= _BV(ADDR_DL);
+        else
+            ADDRCR &= ~_BV(ADDR_DL);
+
+        // write bit for higher byte
+        if ((addr>>8) & _BV(bit))
+            ADDRCR |= _BV(ADDR_DH);
+        else
+            ADDRCR &= ~_BV(ADDR_DH);
+    }
+
+    /* set data */
+    EEPROMDR = byte;
+    EEPROMCR &= ~(_BV(ADDR_EH) | _BV(ADDR_EL));
+
+    /* write eeprom */
+    EEPROMCR &= ~_BV(EEPROM_WR);
+    eeprom_tick();
+
+    EEPROMCR |= _BV(EEPROM_WR);
+    EEPROMCR |= _BV(ADDR_EH) | _BV(ADDR_EL);
+}
+
+/* pulse the clock line for the eeprom */
+void eeprom_tick()
+{
+    EEPROMCR |= _BV(EEPROM_CLK);
+    _delay_ms(EEPROM_TICK_MS);         
+    EEPROMCR &= ~_BV(EEPROM_CLK);
+    _delay_ms(EEPROM_TICK_MS);         
+}
+
-- 
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