Add C28x RS boot ports for F2812 and F28335

c/rs485-boot/ports/tms320f2812/README.md

@@ -0,0 +1,4 @@
+# TMS320F2812
+BALZAM adapter using the common C28x transport, existing `RS485` helpers and
+`flash_tools`. BEGIN byte 8 bit 0 mirrors blocks to RAM while Flash remains the
+persistent recovery source.

c/rs485-boot/ports/tms320f2812/rs_boot_port_f2812.c

@@ -0,0 +1,99 @@
+#include "DSP281x_Device.h"
+#include "RS485.h"
+#include "flash_tools.h"
+#include "rs_boot_port_f2812.h"
+
+static rsbt_t boot;
+
+/* Sector sizes of the external flash, in 16-bit words. */
+static const unsigned long sectors[] = {
+    0x8000UL,0x8000UL,0x8000UL,0x8000UL,0x8000UL,0x8000UL,0x8000UL,
+    0x8000UL,0x8000UL,0x8000UL,0x8000UL,0x8000UL,0x8000UL,0x8000UL,
+    0x4000UL,0x1000UL,0x1000UL,0x2000UL
+};
+
+static int port_tx(void *user, const rsbt_byte_t *data, rsbt_u16_t length)
+{
+    rsbt_u16_t i; (void)user;
+    RS_Line_to_send(COM_1); RS_SetBitMode(&rs_a,8);
+    for(i=0U;i<length;++i){SCIa_Wait4OK();SCIa_send(data[i]&0xFFU);}
+    SCIa_Wait4OK(); RS_SetBitMode(&rs_a,9); RS_Line_to_receive(COM_1);
+    return 1;
+}
+
+static int port_erase(void *user, rsbt_u32_t image_size)
+{
+    unsigned int i; unsigned long at=0UL, words=(image_size+1UL)/2UL;
+    (void)user;
+    if(!image_size || words>F2812_BOOT_FLASH_WORDS)return 0;
+    for(i=0U;i<(sizeof(sectors)/sizeof(sectors[0])) && at<words;++i){
+        if(flash_erase_sector(at))return 0; /* legacy API: zero means success */
+        at+=sectors[i];
+    }
+    return at>=words;
+}
+
+static int port_write(void *user, rsbt_u32_t offset,
+                      const rsbt_byte_t *data, rsbt_u16_t length)
+{
+    rsbt_u16_t i=0U,word; unsigned long address;
+    (void)user;
+    if(offset+length>F2812_BOOT_APP_BYTES)return 0;
+    address=offset/2UL;
+    if(offset&1UL){
+        word=flash_read_word(address);word=(word&0xFF00U)|(data[0]&0xFFU);
+        if(!flash_write_word(address,word))return 0;++address;++i;
+    }
+    while(i<length){
+        word=(data[i]&0xFFU)<<8;
+        if(i+1U<length)word|=data[i+1U]&0xFFU;else word|=0x00FFU;
+        if(!flash_write_word(address++,word))return 0;i+=2U;
+    }
+    return 1;
+}
+
+static int port_read(void *user, rsbt_u32_t offset,
+                     rsbt_byte_t *data, rsbt_u16_t length)
+{
+    rsbt_u16_t i,word; (void)user;
+    if(offset+length>F2812_BOOT_APP_BYTES)return 0;
+    for(i=0U;i<length;++i){word=flash_read_word((offset+i)/2UL);
+        data[i]=((offset+i)&1UL)?(word&0xFFU):((word>>8)&0xFFU);}
+    return 1;
+}
+
+static int port_write_ram(void *user, rsbt_u32_t offset,
+                          const rsbt_byte_t *data, rsbt_u16_t length)
+{
+    rsbt_u16_t i,word; volatile unsigned int *ram;
+    (void)user;
+    if(offset+length>F2812_BOOT_RAM_WORDS*2UL)return 0;
+    ram=(volatile unsigned int *)(F2812_BOOT_RAM_ADDRESS+offset/2UL);
+    if(offset&1UL){word=*ram;*ram++=(word&0xFF00U)|(data[0]&0xFFU);i=1U;}else i=0U;
+    while(i<length){word=(data[i]&0xFFU)<<8;
+        if(i+1U<length)word|=data[i+1U]&0xFFU;else word|=0x00FFU;
+        *ram++=word;i+=2U;}
+    return 1;
+}
+
+static int port_valid(void *user, rsbt_u32_t size, rsbt_u32_t expected)
+{
+    rsbt_byte_t block[32]; rsbt_u32_t crc=0xFFFFFFFFUL,off; rsbt_u16_t i,n,bit;
+    (void)user;
+    for(off=0UL;off<size;off+=32UL){n=(rsbt_u16_t)(size-off);if(n>32U)n=32U;
+        if(!port_read(0,off,block,n))return 0;
+        for(i=0U;i<n;++i){crc^=block[i]&0xFFU;for(bit=0U;bit<8U;++bit)crc=(crc>>1)^((crc&1U)?0xEDB88320UL:0U);}}
+    return (crc^0xFFFFFFFFUL)==expected;
+}
+
+void BalzamBoot_Init(void)
+{
+    rsbt_config_t c; rsbt_port_t p;
+    c.app_address=F2812_BOOT_APP_ADDRESS;c.app_size=F2812_BOOT_APP_BYTES;c.max_block=RSBT_MAX_BLOCK;
+    p.transmit=port_tx;p.erase=port_erase;p.write=port_write;p.read=port_read;
+    p.write_ram=port_write_ram;p.image_valid=port_valid;p.reboot=0;
+    init_flash();(void)rsbt_init(&boot,&c,&p,0);
+}
+
+void BalzamBoot_FeedByte(unsigned int wire_byte){rsbt_feed(&boot,wire_byte&0xFFU);}
+rsbt_state_t BalzamBoot_State(void){return boot.state;}

c/rs485-boot/ports/tms320f2812/rs_boot_port_f2812.h

@@ -0,0 +1,17 @@
+#ifndef RS_BOOT_PORT_F2812_H
+#define RS_BOOT_PORT_F2812_H
+
+#include "rs_boot_transport.h"
+
+/* External AM29-style flash is word-addressed by flash_tools.c. */
+#define F2812_BOOT_APP_ADDRESS  0x00100000UL
+#define F2812_BOOT_FLASH_WORDS  0x00078000UL
+#define F2812_BOOT_APP_BYTES    (F2812_BOOT_FLASH_WORDS * 2UL)
+#define F2812_BOOT_RAM_ADDRESS  0x00080000UL
+#define F2812_BOOT_RAM_WORDS    0x00078000UL
+
+void BalzamBoot_Init(void);
+void BalzamBoot_FeedByte(unsigned int wire_byte);
+rsbt_state_t BalzamBoot_State(void);
+
+#endif