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This commit is contained in:
Andreas Mieke 2018-04-03 17:18:28 +02:00
parent d109bae8d7
commit 9a18bd88f0
22 changed files with 286 additions and 122 deletions
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19
Mieke/SW/MT/eeprom.c
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@ -5,6 +5,7 @@ volatile uint32_t *EEPROMSTick, EEPROMSTickCur;
uint8_t load_byte(uint16_t eeprom_addr)
{
uint8_t data;
// Send address to read from
I2C_GenerateSTART(I2C1, ENABLE);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
I2C_Send7bitAddress(I2C1, EEPROM_ADDR, I2C_Direction_Transmitter);
@ -14,20 +15,24 @@ uint8_t load_byte(uint16_t eeprom_addr)
I2C_SendData(I2C1, (eeprom_addr & 0x00FF));
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
// Switch to Rx mode
I2C_GenerateSTART(I2C1, ENABLE);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
I2C_Send7bitAddress(I2C1, EEPROM_ADDR, I2C_Direction_Receiver);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
// Load byte
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
data = I2C_ReceiveData(I2C1);
I2C_GenerateSTOP(I2C1, ENABLE);
// Return data byte
return data;
}
void write_byte(uint16_t eeprom_addr, uint8_t data)
{
// Send address to write to
I2C_GenerateSTART(I2C1, ENABLE);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
I2C_Send7bitAddress(I2C1, EEPROM_ADDR, I2C_Direction_Transmitter);
@ -37,11 +42,12 @@ void write_byte(uint16_t eeprom_addr, uint8_t data)
I2C_SendData(I2C1, (eeprom_addr & 0x00FF));
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
// Send data byte
I2C_SendData(I2C1, data);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
I2C_GenerateSTOP(I2C1, ENABLE);
// Wait 5 ms to satisfy the write cycle time of the EEPROM
EEPROMSTickCur = *EEPROMSTick;
while((*EEPROMSTick - EEPROMSTickCur) <= 50); // 5ms write cycle, see datasheet param 17
return;
@ -49,27 +55,31 @@ void write_byte(uint16_t eeprom_addr, uint8_t data)
void init_eeprom(volatile uint32_t *SysTickCnt)
{
// Enable GPIOB and I2C1 cloc
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
// Create gpio struct and fill it with default values
GPIO_InitTypeDef gpio;
GPIO_StructInit(&gpio);
// SCL
// Set PB6 to alternate function push pull (SCL)
gpio.GPIO_Mode = GPIO_Mode_AF_PP;
gpio.GPIO_Pin = GPIO_Pin_6;
GPIO_Init(GPIOB, &gpio);
// SDA
// Set PB7 to alternate function open drain (SDA)
gpio.GPIO_Mode = GPIO_Mode_AF_OD;
gpio.GPIO_Pin = GPIO_Pin_7;
GPIO_Init(GPIOB, &gpio);
// Set I2C clock to 400 kHz
I2C_InitTypeDef i2c;
I2C_StructInit(&i2c);
i2c.I2C_ClockSpeed = 400000;
I2C_Init(I2C1, &i2c);
// Enable I2C1 and save SysTick pointer
I2C_Cmd(I2C1, ENABLE);
EEPROMSTick = SysTickCnt;
return;
@ -77,6 +87,7 @@ void init_eeprom(volatile uint32_t *SysTickCnt)
void run_eeprom(uint8_t *success)
{
// Write some data to some addresses and check if the date matches after a read, if not, return
uint8_t set, read;
*success = 0;
set = 0xAA;
@ -111,12 +122,14 @@ void run_eeprom(uint8_t *success)
write_byte(0x0005, set);
read = load_byte(0x0005);
if (set != read) return;
// If everything matches, set success to true and then return
*success = 1;
return;
}
void deinit_eeprom(void)
{
// Disable I2C1
I2C_Cmd(I2C1, DISABLE);
I2C_DeInit(I2C1);
return;