From d10a7b95cc2abe7ae49f7b34a0428ca48a5a75f7 Mon Sep 17 00:00:00 2001
From: Roy_01 <flyu0033136@gmail.com>
Date: Thu, 28 Mar 2024 11:00:56 +0800
Subject: [PATCH] test: add adc_convert_volt(), a function to test ADC
 calibration

---
 ads8691.c        | 61 ++++++++++++++++++++++++++++++++++++++++++++++++
 edc20_pin_ctrl.c |  2 +-
 2 files changed, 62 insertions(+), 1 deletion(-)

diff --git a/ads8691.c b/ads8691.c
index cdc3d93..d32ad09 100644
--- a/ads8691.c
+++ b/ads8691.c
@@ -1,11 +1,14 @@
 #include "ads8691.h"
 #include "edc20_pin_ctrl.h"
 
+#include "nrf_log.h"
 #include "nrf_spim.h"
 
 #include "FreeRTOS.h"
 #include "task.h"
 
+#include <string.h>
+
 /*
  * ADS8691
  * Features:
@@ -189,6 +192,61 @@ int read_range_sel(range_sel_t *range_sel)
     return 0;
 }
 
+double adc_convert_volt(uint16_t range_sel, int32_t val_18bit)
+{
+// LSB[uV]
+#define LSB_VREF_NP_3P000 93.75
+#define LSB_VREF_NP_2P500 78.125
+#define LSB_VREF_NP_1P500 48.875
+#define LSB_VREF_NP_1P250 39.06
+#define LSB_VREF_NP_0P625 19.53
+#define LSB_VREF_P_3P000  46.875
+#define LSB_VREF_P_2P500  39.06
+#define LSB_VREF_P_1P500  23.43
+#define LSB_VREF_P_1P250  19.53
+
+// FULL-SCALE RANGE[V]
+#define FSR_VREF_NP_3P000 24.576
+#define FSR_VREF_NP_2P500 20.48
+#define FSR_VREF_NP_1P500 12.288
+#define FSR_VREF_NP_1P250 10.24
+#define FSR_VREF_NP_0P625 5.12
+#define FSR_VREF_P_3P000  12.288
+#define FSR_VREF_P_2P500  10.24
+#define FSR_VREF_P_1P500  6.144
+#define FSR_VREF_P_1P250  5.12
+
+    double volt;
+
+    if (range_sel == VREF_NP_3P000)
+        volt = (double)val_18bit * LSB_VREF_NP_3P000 / 1000000 - FSR_VREF_NP_3P000 / 2;
+    else if (range_sel == VREF_NP_2P500)
+        volt = (double)val_18bit * LSB_VREF_NP_2P500 / 1000000 - FSR_VREF_NP_2P500 / 2;
+    else if (range_sel == VREF_NP_1P500)
+        volt = (double)val_18bit * LSB_VREF_NP_1P500 / 1000000 - FSR_VREF_NP_1P500 / 2;
+    else if (range_sel == VREF_NP_1P250)
+        volt = (double)val_18bit * LSB_VREF_NP_1P250 / 1000000 - FSR_VREF_NP_1P250 / 2;
+    else if (range_sel == VREF_NP_0P625)
+        volt = (double)val_18bit * LSB_VREF_NP_0P625 / 1000000 - FSR_VREF_NP_0P625 / 2;
+    else if (range_sel == VREF_P_3P000)
+        volt = (double)val_18bit * LSB_VREF_P_3P000 / 1000000 - FSR_VREF_P_3P000 / 2;
+    else if (range_sel == VREF_P_2P500)
+        volt = (double)val_18bit * LSB_VREF_P_2P500 / 1000000 - FSR_VREF_P_2P500 / 2;
+    else if (range_sel == VREF_P_3P000)
+        volt = (double)val_18bit * LSB_VREF_P_1P500 / 1000000 - FSR_VREF_P_1P500 / 2;
+    else if (range_sel == VREF_P_3P000)
+        volt = (double)val_18bit * LSB_VREF_P_1P250 / 1000000 - FSR_VREF_P_1P250 / 2;
+
+    NRF_LOG_INFO("adc_convert_volt(input_range_idx:%d, val_18bit:%d)", range_sel, val_18bit);
+    {
+        char str[32];
+        snprintf(str, sizeof(str), "%.16lf", volt);
+        NRF_LOG_INFO("adc_convert_result: %sV", str);
+    }
+
+    return volt;
+}
+
 int ads8691_read(uint32_t channel, int32_t *adc_val)
 {
     if (m_channel != channel)
@@ -198,6 +256,7 @@ int ads8691_read(uint32_t channel, int32_t *adc_val)
         nrf_gpio_pin_write(ADCA0_PIN, m_channel & (0x01 << 0));
         nrf_gpio_pin_write(ADCA1_PIN, m_channel & (0x01 << 1));
         nrf_gpio_pin_write(ADCA2_PIN, m_channel & (0x01 << 2));
+        NRF_LOG_INFO("channel:%d, [A2,A1,A0]=[%d %d %d]", channel, m_channel & (0x01 << 2), m_channel & (0x01 << 1), m_channel & (0x01 << 0));
     }
 
     if (m_flush)
@@ -208,6 +267,8 @@ int ads8691_read(uint32_t channel, int32_t *adc_val)
 
     uint32_t val = read_word();
     *adc_val     = val >> 14;
+    adc_convert_volt(m_range_sel.range_sel, *adc_val);
+
     return 0;
 }
 
diff --git a/edc20_pin_ctrl.c b/edc20_pin_ctrl.c
index 6e59245..421d0c8 100644
--- a/edc20_pin_ctrl.c
+++ b/edc20_pin_ctrl.c
@@ -290,7 +290,7 @@ void spi2_write(uint32_t cs_pin, uint8_t *p_tx_buffer, uint8_t tx_buffer_length,
 
     xSemaphoreGive(spim2_mutex);
 
-    NRF_LOG_INFO("spi(W)");
+    NRF_LOG_INFO("spi2(W) cs_pin(%d)", cs_pin);
     NRF_LOG_HEXDUMP_INFO(p_tx_buffer, tx_buffer_length);
 
     if (rx_buffer_length > 0)