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Merge pull request #13 from MotoLab/f3_i2c_overclk 

Overclock F3 I2C at 1000KHz
This commit is contained in:
borisbstyle 2015-09-29 20:54:57 +02:00
parent babab7aa4e a126ac56c5
commit 18268e0a3e
1 changed files with 7 additions and 10 deletions
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17
src/main/drivers/bus_i2c_stm32f30x.c
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@ -118,8 +118,10 @@ void i2cInitPort(I2C_TypeDef *I2Cx)
I2C_InitStructure.I2C_OwnAddress1 = 0x00;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_Timing = 0x00E0257A; // 400 Khz, 72Mhz Clock, Analog Filter Delay ON, Rise 100, Fall 10.
//I2C_InitStructure.I2C_Timing = 0x8000050B;
//I2C_InitStructure.I2C_Timing = 0x00E0257A; // 400 Khz, 72Mhz Clock, Analog Filter Delay ON, Setup 100, Hold 10.
//I2C_InitStructure.I2C_Timing = 0x0070123D; // 800 Khz, 72Mhz Clock, Analog Filter Delay ON, Setup 50, Hold 5.
I2C_InitStructure.I2C_Timing = 0x00500E30; // 1000 Khz, 72Mhz Clock, Analog Filter Delay ON, Setup 40, Hold 4.
I2C_Init(I2C1, &I2C_InitStructure);
@ -160,14 +162,9 @@ void i2cInitPort(I2C_TypeDef *I2Cx)
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
// FIXME timing is board specific
//I2C_InitStructure.I2C_Timing = 0x00310309; // //400kHz I2C @ 8MHz input -> PRESC=0x0, SCLDEL=0x3, SDADEL=0x1, SCLH=0x03, SCLL=0x09 - value from TauLabs/Sparky
// ^ when using this setting and after a few seconds of a scope probe being attached to the I2C bus it was observed that the bus enters
// a busy state and does not recover.
I2C_InitStructure.I2C_Timing = 0x00E0257A; // 400 Khz, 72Mhz Clock, Analog Filter Delay ON, Rise 100, Fall 10.
//I2C_InitStructure.I2C_Timing = 0x8000050B;
//I2C_InitStructure.I2C_Timing = 0x00E0257A; // 400 Khz, 72Mhz Clock, Analog Filter Delay ON, Setup 100, Hold 10.
//I2C_InitStructure.I2C_Timing = 0x0070123D; // 800 Khz, 72Mhz Clock, Analog Filter Delay ON, Setup 50, Hold 5.
I2C_InitStructure.I2C_Timing = 0x00500E30; // 1000 Khz, 72Mhz Clock, Analog Filter Delay ON, Setup 40, Hold 4.
I2C_Init(I2C2, &I2C_InitStructure);