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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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18
Mieke/SW/ODD/eeprom.c
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@ -2,21 +2,24 @@
extern volatile uint32_t SysTickCnt;
// EEPROM addresse
#define EEPROM_ADDR (uint8_t)0xA0 // 0b10100000
// ---- Vendor address part
// --- User address part
// - Keep free for R/W bit (set by I2C_Send7bitAddress())
// ---- Vendor address part
// --- User address part
// - Keep free for R/W bit (set by I2C_Send7bitAddress())
uint32_t last_write_tick = 0;
void eeprom_init(void)
{
// Init I2C1
i2c1_init();
}
void eeprom_read(uint16_t address, uint8_t *data, uint16_t length)
{
uint16_t cur_pos;
// Send address of EEPROM and start address on EEPROM
I2C_GenerateSTART(I2C1, ENABLE);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
I2C_Send7bitAddress(I2C1, EEPROM_ADDR, I2C_Direction_Transmitter);
@ -26,12 +29,14 @@ void eeprom_read(uint16_t address, uint8_t *data, uint16_t length)
I2C_SendData(I2C1, (address & 0x00FF));
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
// Switch to receive mode
I2C_GenerateSTART(I2C1, ENABLE);
I2C_AcknowledgeConfig(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));
// Read all bytes and disable ACK on last byte
for(cur_pos = 0; cur_pos < length; cur_pos++) {
if(cur_pos == length - 1) {
I2C_AcknowledgeConfig(I2C1, DISABLE);
@ -40,6 +45,7 @@ void eeprom_read(uint16_t address, uint8_t *data, uint16_t length)
data[cur_pos] = I2C_ReceiveData(I2C1);
}
// Send stop condition
I2C_GenerateSTOP(I2C1, ENABLE);
}
@ -49,9 +55,13 @@ void eeprom_write(uint16_t address, uint8_t *data, uint16_t length)
uint16_t cur_pos = 0;
address = address & 0xFFA0;
// If more than one page is needed, cycle over the pages
for(cur_page = 0; cur_page <= ((length-1)/64); cur_page++) {
// Wait 5 ms for the write cycle (see datasheet)
while((SysTickCnt - last_write_tick) <= 5);
// Send start condition
I2C_GenerateSTART(I2C1, ENABLE);
// Send EEPROM address and start address of data to send
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
I2C_Send7bitAddress(I2C1, EEPROM_ADDR, I2C_Direction_Transmitter);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
@ -60,11 +70,13 @@ void eeprom_write(uint16_t address, uint8_t *data, uint16_t length)
I2C_SendData(I2C1, (address & 0x00FF));
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
// Send max 64 bytes (1 page) of data
for(; (cur_pos < length) && (cur_pos%64 <= 63); cur_pos++) {
I2C_SendData(I2C1, data[cur_pos]);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
}
// Generate stop condition and calculate address of next page (if needed)
I2C_GenerateSTOP(I2C1, ENABLE);
address += 0x0040;
last_write_tick = SysTickCnt;