From 52eb479110cbbeabaa7f82492496ce0ec83256ab Mon Sep 17 00:00:00 2001
From: Michael Dryden <mdryden@chem.utoronto.ca>
Date: Wed, 4 Feb 2015 17:44:02 -0500
Subject: [PATCH] ads1255: added function for single reads. Changed dummy SPI
 byte to avoid conflict with ADS1255 SDATAC command.

---
 DSTAT-temp/src/ads1255.c               | 39 ++++++++++++++++++++++++++
 DSTAT-temp/src/ads1255.h               |  1 +
 DSTAT-temp/src/config/conf_usart_spi.h |  1 +
 3 files changed, 41 insertions(+)

diff --git a/DSTAT-temp/src/ads1255.c b/DSTAT-temp/src/ads1255.c
index 745271f..2150910 100644
--- a/DSTAT-temp/src/ads1255.c
+++ b/DSTAT-temp/src/ads1255.c
@@ -244,6 +244,45 @@ int32_t ads1255_read_fast24(void){
 		input_buffer.uint[3] = 0x0;
 	
 //	printf("%x %x %x\n\r", input_buffer.uint[2],input_buffer.uint[1], input_buffer.uint[0]);
+	cpu_irq_restore(flags);
+	return input_buffer.int32;
+}
+
+int32_t ads1255_read_single24(void){
+
+	union{
+		uint8_t uint[4];
+		int32_t int32;
+	} input_buffer;
+	
+	input_buffer.int32 = 0;
+	
+	irqflags_t flags;
+	flags = cpu_irq_save();
+	
+	usart_spi_select_device(&USARTE1, &spi_device_conf);
+	usart_spi_transmit(&USARTE1, ADS_RDATA);
+	delay_us(6.5);
+	
+	for (int i = 2; i >= 0; --i){
+		while (usart_data_register_is_empty(&USARTE1) == false)
+		;
+		usart_put(&USARTE1, CONFIG_USART_SPI_DUMMY);
+		while (usart_rx_is_complete(&USARTE1) == false)
+		;
+		input_buffer.uint[i] = usart_get(&USARTE1);
+	}
+	
+	while (!usart_tx_is_complete(&USARTE1))
+	;
+	usart_clear_tx_complete(&USARTE1);
+	usart_spi_deselect_device(&USARTE1, &spi_device_conf);
+	
+	if (input_buffer.uint[2] > 0x7F)
+		input_buffer.uint[3] = 0xFF;
+	else
+		input_buffer.uint[3] = 0x0;
+	
 	cpu_irq_restore(flags);
 	return input_buffer.int32;
 }
\ No newline at end of file
diff --git a/DSTAT-temp/src/ads1255.h b/DSTAT-temp/src/ads1255.h
index f01d2d5..630ced5 100644
--- a/DSTAT-temp/src/ads1255.h
+++ b/DSTAT-temp/src/ads1255.h
@@ -68,6 +68,7 @@ void ads1255_init_module(void);
 int16_t ads1255_read_fast(void);
 int16_t ads1255_read_fast_single(void);
 int32_t ads1255_read_fast24(void);
+int32_t ads1255_read_single24(void);
 void ads1255_reg_read(uint8_t address);
 void ads1255_reset(void);
 void ads1255_setup(uint8_t buff, uint8_t rate, uint8_t pga);
diff --git a/DSTAT-temp/src/config/conf_usart_spi.h b/DSTAT-temp/src/config/conf_usart_spi.h
index b5360e4..a759337 100644
--- a/DSTAT-temp/src/config/conf_usart_spi.h
+++ b/DSTAT-temp/src/config/conf_usart_spi.h
@@ -43,5 +43,6 @@
 #ifndef CONF_USART_SPI_H_INCLUDED
 #define CONF_USART_SPI_H_INCLUDED
 
+#define CONFIG_USART_SPI_DUMMY 0xFE
 
 #endif /* CONF_USART_SPI_H_INCLUDED */
-- 
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