Add send_cks()

The ADC readings were not covered by the checksum.  Send a second 'Q'
line for those.

src/bate.c

@@ -496,6 +496,9 @@ int main()
 					send_calib_adc(i);
 				send_eol();
 			}
+			if (config.send & (SEND_ADC_VOLT|SEND_ADC_HEX))
+				if (config.power & POWER_LINE)
+					send_cks();
 		}
 
 		command();
@@ -560,6 +563,8 @@ int main()
 			continue;
 		}
 
+		uart_cks = 0;
+
 		if (config.send & SEND_CONFIG && !config_clock--) {
 			send_config = 1;
 			config_clock = config.confp;
@@ -618,6 +623,11 @@ int main()
 			DEBUG_PRINT(0x77, trigger);
 		}
 
+		if (config.power & POWER_LINE) {
+			send_cks();
+			uart_cks = 0;
+		}
+
 		uart_tick();
 		trigger = TRIGGER_CONT;
 		send_config = 0;

src/uart.c

@@ -72,6 +72,7 @@ uint8_t uart_tx[256];
 volatile uint8_t uart_tx_w;
 volatile uint8_t uart_tx_r;
 volatile uint8_t uart_tx_busy;
+uint8_t uart_cks;
 
 #if 0
 

src/uart.h

@@ -35,3 +35,6 @@ void send_hex_long(uint32_t b)
 	send_hex_word(b >> 16);
 	send_hex_word(b);
 }
+
+extern uint8_t uart_cks;
+void send_cks();

src/uart_tx.S

@@ -9,6 +9,7 @@
 	.global send_str
 	.global uart_busy
 	.global send_hex
+	.global send_cks
 	.global send_eol
 	.global	command
 
@@ -34,6 +35,9 @@ put_char:
 	sbci 	r31, hi8(-(uart_tx))
 	st 	Z, r22
 	sts 	uart_tx_w, r19
+	lds	r19, uart_cks
+	add	r19, r22
+	sts	uart_cks, r19
 1:
 	// r22 preserved
 	// r23 full when zero
@@ -89,6 +93,13 @@ uart_busy:
 9:
 	ret
 
+	; send_hex('Q', &uart_cks, 1, 0);
+send_cks:
+	ldi 	r24, 'Q'
+	ldi	r18, 0
+	ldi	r20, 1
+	ldi	r22, lo8(uart_cks)
+	ldi	r23, hi8(uart_cks)
 send_hex:
 	movw	r26, r22
 	rcall	send_char