2026-05-25 06:15:43 +08:00 · 2010-04-18 23:31:35 +00:00
parent ee9a3a2d63
commit 55866befe6
2 changed files with 152 additions and 0 deletions
@@ -0,0 +1,146 @@
+#include "i2c.h"
+
+#include <stm32/rcc.h>
+#include <stm32/gpio.h>
+#include <stm32/flash.h>
+#include <stm32/misc.h>
+
+#include "led.h"
+
+#ifdef USE_I2C1
+
+#define I2C_TRANSMITTER             0x00
+#define I2C_RECEIVER                0x01
+static const uint8_t i2c2_direction = I2C_TRANSMITTER;
+
+void i2c1_hw_init(void) {
+
+  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
+  NVIC_InitTypeDef  NVIC_InitStructure;
+  
+  /* Configure and enable I2C1 event interrupt -------------------------------*/
+  NVIC_InitStructure.NVIC_IRQChannel = I2C1_EV_IRQn;
+  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
+  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
+  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
+  NVIC_Init(&NVIC_InitStructure);
+
+  /* Configure and enable I2C1 err interrupt -------------------------------*/
+  NVIC_InitStructure.NVIC_IRQChannel = I2C1_ER_IRQn;
+  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
+  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
+  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
+  NVIC_Init(&NVIC_InitStructure);
+  
+  /* Enable peripheral clocks --------------------------------------------------*/
+  /* Enable I2C1 clock */
+  RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
+  /* Enable GPIOB clock */
+  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
+
+  /* Configure I2C1 pins: SCL and SDA ------------------------------------------*/
+  GPIO_InitTypeDef GPIO_InitStructure;
+  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_6 | GPIO_Pin_7;
+  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
+  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
+  GPIO_Init(GPIOB, &GPIO_InitStructure);
+
+  /* I2C configuration ----------------------------------------------------------*/
+  I2C_InitTypeDef  I2C_InitStructure; 
+  I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
+  I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
+  I2C_InitStructure.I2C_OwnAddress1 = 0x02;
+  I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
+  //  I2C_InitStructure.I2C_Ack = I2C_Ack_Disable;
+  I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
+  I2C_InitStructure.I2C_ClockSpeed = 200000;
+  
+  /* I2C Peripheral Enable */
+  I2C_Cmd(I2C1, ENABLE);
+  /* Apply I2C configuration after enabling it */
+  I2C_Init(I2C1, &I2C_InitStructure);
+
+  /* Enable I2C1 event, buffer and error interrupts */
+  I2C_ITConfig(I2C1, I2C_IT_EVT, ENABLE);
+  //  I2C_ITConfig(I2C1, I2C_IT_EVT | I2C_IT_ERR, ENABLE);
+  //  I2C_ITConfig(I2C1, I2C_IT_EVT, ENABLE);
+
+}
+
+
+void i2c1_ev_irq_handler(void) {
+  switch (I2C_GetLastEvent(I2C1)) {
+  case I2C_EVENT_MASTER_MODE_SELECT:                 /* EV5 */
+    if(i2c2_direction == I2C_TRANSMITTER) {
+      /* Master Transmitter : Send slave Address for write */
+      I2C_Send7bitAddress(I2C1, (i2c1_slave_addr&0xFE), I2C_Direction_Transmitter);
+    }
+    else {
+      /* Master Receiver : Send slave Address for read */
+      I2C_Send7bitAddress(I2C1, (i2c1_slave_addr&0xFE), I2C_Direction_Receiver);
+    }
+    break;
+    
+    /* Master Transmitter --------------------------------------------------*/
+    /* Test on I2C1 EV6 and first EV8 and clear them */
+  case I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED:  
+    /* Send the first data */
+    I2C_ITConfig(I2C1, I2C_IT_BUF, ENABLE);
+    I2C_SendData(I2C1, i2c1_buf[0]);
+    i2c1_index = 1;
+    break;
+    
+    /* Test on I2C1 EV8 and clear it */
+  case I2C_EVENT_MASTER_BYTE_TRANSMITTING:  /* Without BTF, EV8 */     
+    if(i2c1_index < i2c1_len_w) {
+      I2C_SendData(I2C1, i2c1_buf[i2c1_index]);
+      i2c1_index++;
+    }
+    else {
+      I2C_GenerateSTOP(I2C1, ENABLE);
+      I2C_ITConfig(I2C1, I2C_IT_BUF, DISABLE);
+    }
+    break;
+
+  case I2C_EVENT_MASTER_BYTE_TRANSMITTED: /* With BTF EV8-2 */
+    if(i2c1_index >= i2c1_len_w) {
+      I2c1StopHandler();
+    }
+    break;
+
+    /* Master Receiver -------------------------------------------------------*/
+  case I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED:
+    //  if(Tx2BufferSize == 1) {
+      /* Disable I2C1 acknowledgement */
+    //      I2C_AcknowledgeConfig(I2C1, DISABLE);
+      /* Send I2C1 STOP Condition */
+    //      I2C_GenerateSTOP(I2C1, ENABLE);
+    //}
+    break;
+    
+    /* Test on I2C1 EV7 and clear it */
+  case I2C_EVENT_MASTER_BYTE_RECEIVED:
+    /* Store I2C1 received data */
+    //    I2C1_Buffer_Rx[Rx1_Idx++] = I2C_ReceiveData (I2C1);
+    /* Disable ACK and send I2C1 STOP condition before receiving the last data */
+    //    if(Rx1_Idx == (Tx2BufferSize - 1)) {
+      /* Disable I2C1 acknowledgement */
+    //      I2C_AcknowledgeConfig(I2C1, DISABLE);
+      /* Send I2C1 STOP Condition */
+    //      I2C_GenerateSTOP(I2C1, ENABLE);
+    //  }
+    break;
+    
+  default:
+    break;
+  }
+}
+
+void i2c1_er_irq_handler(void) {
+  /* Check on I2C2 AF flag and clear it */
+  if (I2C_GetITStatus(I2C1, I2C_IT_AF))
+    I2C_ClearITPendingBit(I2C1, I2C_IT_AF);
+  LED_ON(4);
+}
+
+#endif /* USE_I2C1 */
@@ -40,6 +40,12 @@ extern void i2c1_er_irq_handler(void);

 #define I2c1SendStart() { I2C_GenerateSTART(I2C1, ENABLE); }

+#ifdef I2C1_STOP_HANDLER
+#include I2C1_STOP_HANDLER_HEADER
+#define I2c1StopHandler() I2C1_STOP_HANDLER()
+#else 
+#define I2c1StopHandler() {}
+#endif /* I2C1_STOP_HANDLER */

 #endif /* USE_I2C1 */