From 2bf247c103f262f39f31e2ccec4c53c553c8f4e4 Mon Sep 17 00:00:00 2001
From: Roy_01 <flyu0033136@gmail.com>
Date: Wed, 27 Dec 2023 14:50:14 +0800
Subject: [PATCH] new twi0 (i2c0)

---
 app_config.h              |  5 ++++
 bmd380_peripheral.vcxproj |  4 ++-
 i2c.c                     | 58 +++++++++++++++++++++++++++++++++++++++
 main.c                    |  2 ++
 4 files changed, 68 insertions(+), 1 deletion(-)
 create mode 100644 i2c.c

diff --git a/app_config.h b/app_config.h
index 15f94ce..423c1db 100644
--- a/app_config.h
+++ b/app_config.h
@@ -193,6 +193,11 @@ extern "C"
 #define SPI_DEFAULT_CONFIG_IRQ_PRIORITY   7
 #define NRFX_SPIM_MISO_PULL_CFG           3
 
+// Enable twi(i2c)
+#define TWI_ENABLED                       1
+#define TWI0_ENABLED                      1
+#define TWI0_USE_EASY_DMA                 1
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/bmd380_peripheral.vcxproj b/bmd380_peripheral.vcxproj
index 7c462c2..80fda79 100644
--- a/bmd380_peripheral.vcxproj
+++ b/bmd380_peripheral.vcxproj
@@ -174,12 +174,14 @@
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|VisualGDB'">true</ExcludedFromBuild>
     </ClCompile>
     <ClCompile Include="..\bmd380_sdk\integration\nrfx\legacy\nrf_drv_twi.c">
-      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|VisualGDB'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|VisualGDB'">
+      </ExcludedFromBuild>
     </ClCompile>
     <ClCompile Include="..\bmd380_sdk\integration\nrfx\legacy\nrf_drv_uart.c">
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|VisualGDB'">true</ExcludedFromBuild>
     </ClCompile>
     <ClCompile Include="edc_regular_data.c" />
+    <ClCompile Include="i2c.c" />
     <ClCompile Include="led.c" />
     <ClCompile Include="le_adv.c" />
     <ClCompile Include="le_dfu.c" />
diff --git a/i2c.c b/i2c.c
new file mode 100644
index 0000000..1df8c0a
--- /dev/null
+++ b/i2c.c
@@ -0,0 +1,58 @@
+#include "nrf_gpio.h"
+#include "nrf_log.h"
+#include "nrf_drv_twi.h"
+
+#define I2C_SDA             NRF_GPIO_PIN_MAP(0, 11)
+#define I2C_SCL             NRF_GPIO_PIN_MAP(0, 22)
+
+static const nrf_drv_twi_t twi0 = NRF_DRV_TWI_INSTANCE(0);
+
+static void virtual_data(uint8_t *p_rx_buf, uint8_t rx_buffer_length)
+{
+    uint8_t virtual_data_buff[20] = {9,8,7,6,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20};
+    if (rx_buffer_length == 0)
+        return;
+
+    memcpy(p_rx_buf, virtual_data_buff, rx_buffer_length);
+}
+
+void twi0_init(void)
+{
+    ret_code_t err_code;
+
+    const nrf_drv_twi_config_t twi0_config = {
+       .scl                = I2C_SCL,
+       .sda                = I2C_SDA,
+       .frequency          = NRF_DRV_TWI_FREQ_100K,
+       .interrupt_priority = APP_IRQ_PRIORITY_HIGH,
+       .clear_bus_init     = false
+    };
+
+    err_code = nrf_drv_twi_init(&twi0, &twi0_config, NULL, NULL);
+    APP_ERROR_CHECK(err_code);
+
+    nrf_drv_twi_enable(&twi0);
+}
+
+void twi0_write_reg(uint8_t slave_addr, uint8_t reg_addr, uint8_t *data, uint8_t data_len)
+{
+    uint8_t i2c_buf[data_len+1]; //reg_addr + data
+
+    memcpy(i2c_buf, &reg_addr, 1);
+    memcpy(i2c_buf+1, data, data_len+1);
+    APP_ERROR_CHECK(nrf_drv_twi_tx(&twi0, slave_addr, i2c_buf, sizeof(i2c_buf), false));
+
+    NRF_LOG_INFO("i2c(W): slave_addr=0x%02x", slave_addr);
+    NRF_LOG_HEXDUMP_INFO(i2c_buf, sizeof(i2c_buf));
+}
+
+void twi0_read_reg(uint8_t slave_addr, uint8_t reg_addr, uint8_t *p_rx_buf, uint8_t rx_buffer_length)
+{
+    APP_ERROR_CHECK(nrf_drv_twi_tx(&twi0, slave_addr, &reg_addr, 1, false));
+    APP_ERROR_CHECK(nrf_drv_twi_rx(&twi0, slave_addr, p_rx_buf, rx_buffer_length));
+    
+    // virtual_data(p_rx_buf, rx_buffer_length);
+
+    NRF_LOG_INFO("i2c(R): slave_addr=0x%02x reg_addr=0x%02x", slave_addr, reg_addr);
+    NRF_LOG_HEXDUMP_INFO(p_rx_buf, rx_buffer_length);
+}
diff --git a/main.c b/main.c
index 150f589..c27f579 100644
--- a/main.c
+++ b/main.c
@@ -190,6 +190,7 @@ static void enable_6994_callback(void *pvParameter)
     NRF_LOG_INFO("enable 6994");
 }
 
+extern void twi0_init(void);
 extern void spi_init(void);
 int main(void)
 {
@@ -197,6 +198,7 @@ int main(void)
     NRF_LOG_DEFAULT_BACKENDS_INIT();
     NRF_LOG_INFO("%s Build: %s %s", ELITE_DEVICE_NAME, __TIME__, __DATE__);
 
+    twi0_init();
     spi_init();
     gpio_init();
     led_init();