diff options
Diffstat (limited to 'workspace/ts100/src/I2C.c')
| -rw-r--r-- | workspace/ts100/src/I2C.c | 359 |
1 files changed, 139 insertions, 220 deletions
diff --git a/workspace/ts100/src/I2C.c b/workspace/ts100/src/I2C.c index 51d626ad..bed47bf3 100644 --- a/workspace/ts100/src/I2C.c +++ b/workspace/ts100/src/I2C.c @@ -1,229 +1,148 @@ -/********************* (C) COPYRIGHT 2015 e-Design Co.,Ltd. **********************
-File Name : I2C.c
-Version : S100 APP Ver 2.11
-Description:
-Author : Celery
-Data: 2015/07/20
-History:
-2015/07/07 ͳһ������
-2015/07/21 I2C_DELAYTIME = 2;
-*******************************************************************************/
-
-#include "stm32f10x.h"
+/*
+ * I2C.h hardware interface class
+ * Based on the STM32 app note AN2824
+ */
#include "I2C.h"
-#include "Bios.h"
-#include "Oled.h"
-#include "S100V0_1.h"
-
-// --------- ����I2C�ӿ���ض���-------- //
-#define SDA GPIO_Pin_7
-#define SCL GPIO_Pin_6
-
-#define HIGH 1
-#define LOW 0
-
-#define SDA_VAL GPIO_ReadInputDataBit(GPIOB, SDA)
-#define SCL_VAL GPIO_ReadInputDataBit(GPIOB, SCL)
-
-#define I2C_MORE 1
-#define I2C_LAST 0
-#define I2C_TIMEOUT 255
-#define FAILURE 0
-#define SUCCEED 1
-#define I2C_DELAYTIME 2
-
-static void Sim_I2C_Set(u8 pin, u8 status);
-static void Sim_I2C_Stop(void);
-static void Sim_I2C_Start(void);
-static u8 Sim_I2C_RD_Byte(u8 more);
-static u8 Sim_I2C_WR_Byte(u8 data);
-
-/*******************************************************************************
-������: Delay_uS
-��������: �����ʱ
-�������:us
-���ز���:NULL
-*******************************************************************************/
-void Delay_uS(u32 us)
-{
- while(us) us--;
+/*
+ * Configure the I2C port hardware
+ */
+void I2C_Configuration(void) {
+ GPIO_InitTypeDef GPIO_InitStructure;
+ I2C_InitTypeDef I2C_InitStructure;
+
+ /* PB6,7 SCL and SDA */
+ 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);
+
+ /* I2C1 configuration ------------------------------------------------------*/
+ I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
+ I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
+ I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
+ I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
+ I2C_InitStructure.I2C_ClockSpeed = 100000; //100k
+ I2C_Init(I2C1, &I2C_InitStructure);
+ I2C_Cmd(I2C1, ENABLE);
}
-/*******************************************************************************
-������: I2C_Configuration
-��������: ����I2C
-�������:NULL
-���ز���:NULL
-*******************************************************************************/
-void I2C_Configuration(void)
-{
- GPIO_InitTypeDef GPIO_InitStructure;
- I2C_InitTypeDef I2C_InitStructure;
- GPIO_Init_OLED();
- /* PB6,7 SCL and SDA */
- 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);
+/*
+ * Writes a page of data over I2C using the I2C1 peripheral in the stm32
+ *
+ */
+void I2C_PageWrite(u8* buf, u8 nbyte, u8 deviceaddr) {
+
+ while (I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY)) {
+ }
+ // Intiate Start Sequence
+ I2C_GenerateSTART(I2C1, ENABLE);
+ while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)) {
+ }
+ // Send Address
+ I2C_Send7bitAddress(I2C1, deviceaddr << 1, I2C_Direction_Transmitter);
+ while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)) {
+ }
+ // Write first byte EV8_1
+ I2C_SendData(I2C1, *buf++);
+
+ while (--nbyte) {
+ // wait on BTF
+ while (!I2C_GetFlagStatus(I2C1, I2C_FLAG_BTF)) {
+ }
+ I2C_SendData(I2C1, *buf++);
+ }
+
+ while (!I2C_GetFlagStatus(I2C1, I2C_FLAG_BTF)) {
+ }
+ I2C_GenerateSTOP(I2C1, ENABLE);
+ while (I2C_GetFlagStatus(I2C1, I2C_FLAG_STOPF)) {
+ }
- /* I2C1 configuration ------------------------------------------------------*/
- I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
- I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
- I2C_InitStructure.I2C_OwnAddress1 = DEVICEADDR_OLED;
- I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
- I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
- I2C_InitStructure.I2C_ClockSpeed = 100000;//100k
- I2C_Init(I2C1, &I2C_InitStructure);
- I2C_Cmd(I2C1, ENABLE);
}
-/*******************************************************************************
-������: I2C_Configuration
-��������: ����I2C
-�������:NULL
-���ز���:NULL
-*******************************************************************************/
-void Sim_I2C_Set(u8 pin, u8 status)
-{
- if(status == HIGH) GPIO_SetBits (GPIOB, pin);
- if(status == LOW) GPIO_ResetBits(GPIOB, pin);
+/*
+ * Read Page of data using I2C1 peripheral
+ */
+
+void I2C_PageRead(u8* buf, u8 nbyte, u8 deviceaddr, u8 readaddr) {
+ I2C_GenerateSTART(I2C1, ENABLE);
+ while (I2C_GetFlagStatus(I2C1, I2C_FLAG_SB) == RESET)
+ ;
+ I2C_Send7bitAddress(I2C1, deviceaddr << 1, I2C_Direction_Transmitter);
+ while (I2C_GetFlagStatus(I2C1, I2C_FLAG_ADDR) == RESET)
+ ;
+ I2C_GetFlagStatus(I2C1, I2C_FLAG_MSL);
+ while (I2C_GetFlagStatus(I2C1, I2C_FLAG_TXE) == RESET)
+ ;
+ // Send an 8bit byte address
+ I2C_SendData(I2C1, readaddr);
+ while (I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY)) {
+ }
+ I2C_AcknowledgeConfig(I2C1, DISABLE);
+ I2C_NACKPositionConfig(I2C1, I2C_NACKPosition_Current);
+ I2C_GenerateSTART(I2C1, ENABLE);
+ while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)) {
+ }
+ I2C_Send7bitAddress(I2C1, deviceaddr << 1, I2C_Direction_Receiver);
+ while (!I2C_GetFlagStatus(I2C1, I2C_FLAG_ADDR)) {
+ }
+ if (nbyte == 1) {
+ // Clear Ack bit
+ I2C_AcknowledgeConfig(I2C1, DISABLE);
+ // EV6_1 -- must be atomic -- Clear ADDR, generate STOP
+ __disable_irq();
+ (void) I2C1->SR2;
+ I2C_GenerateSTOP(I2C1, ENABLE);
+ __enable_irq();
+ // Receive data EV7
+ while (!I2C_GetFlagStatus(I2C1, I2C_FLAG_RXNE)) {
+ }
+ *buf++ = I2C_ReceiveData(I2C1);
+ } else if (nbyte == 2) {
+ // Set POS flag
+ I2C_NACKPositionConfig(I2C1, I2C_NACKPosition_Next);
+ // EV6_1 -- must be atomic and in this order
+ __disable_irq();
+ (void) I2C1->SR2; // Clear ADDR flag
+ I2C_AcknowledgeConfig(I2C1, DISABLE); // Clear Ack bit
+ __enable_irq();
+ // EV7_3 -- Wait for BTF, program stop, read data twice
+ while (!I2C_GetFlagStatus(I2C1, I2C_FLAG_BTF)) {
+ }
+ __disable_irq();
+ I2C_GenerateSTOP(I2C1, ENABLE);
+ *buf++ = I2C1->DR;
+ __enable_irq();
+ *buf++ = I2C1->DR;
+ } else {
+ (void) I2C1->SR2; // Clear ADDR flag
+ while (nbyte-- != 3) {
+ // EV7 -- cannot guarantee 1 transfer completion time, wait for BTF
+ // instead of RXNE
+ while (!I2C_GetFlagStatus(I2C1, I2C_FLAG_BTF)) {
+ }
+ *buf++ = I2C_ReceiveData(I2C1);
+ }
+
+ while (!I2C_GetFlagStatus(I2C1, I2C_FLAG_BTF)) {
+ }
+ // EV7_2 -- Figure 1 has an error, doesn't read N-2 !
+ I2C_AcknowledgeConfig(I2C1, DISABLE); // clear ack bit
+ __disable_irq();
+ *buf++ = I2C_ReceiveData(I2C1); // receive byte N-2
+ I2C_GenerateSTOP(I2C1, ENABLE); // program stop
+ __enable_irq();
+ *buf++ = I2C_ReceiveData(I2C1); // receive byte N-1
+ // wait for byte N
+ while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED)) {
+ }
+ *buf++ = I2C_ReceiveData(I2C1);
+ nbyte = 0;
+ }
+ // Wait for stop
+ while (I2C_GetFlagStatus(I2C1, I2C_FLAG_STOPF)) {
+ }
+ return;
}
-/*******************************************************************************
-������: Sim_I2C_Start
-��������: ��ʼ
-�������:NULL
-���ز���:NULL
-*******************************************************************************/
-void Sim_I2C_Start(void)
-{
- GPIO_InitTypeDef GPIO_InitStructure;
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); // I2C_PIN_EN();
- GPIO_InitStructure.GPIO_Pin = SCL | SDA;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_Init (GPIOB, &GPIO_InitStructure);
-
- Sim_I2C_Set(SCL, LOW); // SCL low
- Sim_I2C_Set(SDA, HIGH); // SDA float, set as output high
- Sim_I2C_Set(SCL, HIGH); // SCL high
- Delay_uS(I2C_DELAYTIME);
- Sim_I2C_Set(SDA, LOW); // SDA high->low while sclk high, S state occur...
- Delay_uS(I2C_DELAYTIME);
- Sim_I2C_Set(SCL, LOW); // SCL low
-}
-/*******************************************************************************
-������: Sim_I2C_Stop
-��������: ֹͣ
-�������:NULL
-���ز���:NULL
-*******************************************************************************/
-void Sim_I2C_Stop(void)
-{
- Sim_I2C_Set(SCL, LOW); // SCL low
- Sim_I2C_Set(SDA, LOW); // SDA low
- Delay_uS(I2C_DELAYTIME);
- Sim_I2C_Set(SCL, HIGH); // SCL high
- Delay_uS(I2C_DELAYTIME);
- Sim_I2C_Set(SDA, HIGH); // SDA low->high while sclk high, P state occur
- Delay_uS(I2C_DELAYTIME);
- Sim_I2C_Set(SCL, LOW); // SCL low
- Delay_uS(I2C_DELAYTIME);
-}
-/*******************************************************************************
-������: Sim_I2C_WR_Byte
-��������:��I2Cд��λ����
-�������:dataҪд�������
-���ز���:NULL
-*******************************************************************************/
-u8 Sim_I2C_WR_Byte(u8 data)
-{
- u8 i = 8;
-
- while(i--) { //send out a bit by sda line.
- Sim_I2C_Set(SCL, LOW); // sclk low
- if(data & 0x80) Sim_I2C_Set(SDA, HIGH); // send bit is 1
- else Sim_I2C_Set(SDA, LOW); // send bit is 0
- Delay_uS(I2C_DELAYTIME);
- Sim_I2C_Set(SCL, HIGH); // SCL high
- Delay_uS(I2C_DELAYTIME);
- data <<=1; // left shift 1 bit, MSB send first.
- }
- Sim_I2C_Set(SCL, LOW); // SCL low
- Sim_I2C_Set(SDA, HIGH); // SDA set as input
- for(i=I2C_TIMEOUT; i!=0; i--) { // wait for sda low to receive ack
- Delay_uS(I2C_DELAYTIME);
- if (!SDA_VAL) {
- Sim_I2C_Set(SCL, HIGH); // SCL high
- Delay_uS(I2C_DELAYTIME);
- Sim_I2C_Set(SCL, LOW); // SCL_LOW();
- Delay_uS(I2C_DELAYTIME);
- return SUCCEED;
- }
- }
- return FAILURE;
-}
-/*******************************************************************************
-������: Sim_I2C_RD_Byte
-��������:��I2C�������
-�������:more
-���ز���:�����İ�λ����
-*******************************************************************************/
-u8 Sim_I2C_RD_Byte(u8 more)
-{
- u8 i = 8, byte = 0;
-
- Sim_I2C_Set(SDA, HIGH); // SDA set as input
- while(i--) {
- Sim_I2C_Set(SCL, LOW); // SCL low
- Delay_uS(I2C_DELAYTIME);
- Sim_I2C_Set(SCL, HIGH); // SCL high
- Delay_uS(I2C_DELAYTIME);
- byte <<=1; //recv a bit
- if (SDA_VAL) byte |= 0x01;
- }
- Sim_I2C_Set(SCL, LOW);
- if(!more) Sim_I2C_Set(SDA, HIGH); //last byte, send nack.
- else Sim_I2C_Set(SDA, LOW); //send ack
- Delay_uS(I2C_DELAYTIME);
- Sim_I2C_Set(SCL, HIGH); // SCL_HIGH();
- Delay_uS(I2C_DELAYTIME);
- Sim_I2C_Set(SCL, LOW);
- return byte;
-}
-/*******************************************************************************
-������: I2C_PageWrite
-��������:�� ��ַ deviceaddr д��numbyte���ֽڵ����ݣ�д���������pbuf
-�������:pbuf д������ݣ�numbyte Ϊд����ֽ�����deviceaddrΪд��ĵ�ַ
-���ز���:NULL
-*******************************************************************************/
-void I2C_PageWrite(u8* pbuf, u8 numbyte,u8 deviceaddr )
-{
- Sim_I2C_Start();
- Sim_I2C_WR_Byte(deviceaddr<<1);
- while(numbyte--) Sim_I2C_WR_Byte(*pbuf++);
- Sim_I2C_Stop();
-}
-/*******************************************************************************
-������: I2C_PageRead
-��������:��I2C�������
-�������: pbuf �������Ĵ�ŵ�ַ numbyteΪ���������ֽ���
- deviceaddr�豸��ַ readaddr��ȡ�����ݵ�ַ
-���ز���:�����İ�λ����
-*******************************************************************************/
-void I2C_PageRead(u8* pbuf, u8 numbyte,u8 deviceaddr, u8 readaddr)
-{
- Sim_I2C_Start();
- Sim_I2C_WR_Byte(deviceaddr<<1);
- Sim_I2C_WR_Byte(readaddr);
- Sim_I2C_Start();
- Sim_I2C_WR_Byte((deviceaddr<<1)|1);
-
- while(numbyte--) {
- if(numbyte) *pbuf++ = Sim_I2C_RD_Byte(I2C_MORE);
- else *pbuf++ = Sim_I2C_RD_Byte(I2C_LAST);
- }
- Sim_I2C_Stop();
-}
-/******************************** END OF FILE *********************************/
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