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| author | Marcin Bukat <marcin.bukat@gmail.com> | 2013-04-04 13:06:46 +0200 |
|---|---|---|
| committer | Marcin Bukat <marcin.bukat@gmail.com> | 2013-04-04 13:06:46 +0200 |
| commit | 670af6344ea5fd2b3f84e33bde305d3e2f3c13a3 (patch) | |
| tree | d83b0ec6e858dcb7774048520984fa5f5413a85f | |
| parent | f8d36b5baab7bc60b2d150ff451e28c12b77bb96 (diff) | |
| download | rockbox-670af6344ea5fd2b3f84e33bde305d3e2f3c13a3.tar.gz rockbox-670af6344ea5fd2b3f84e33bde305d3e2f3c13a3.zip | |
rk27xx: Correct comment about i2c divider calculation
Change-Id: I75605d5bd6f8a3d1f44b63a9f4467ebcdd15267a
| -rw-r--r-- | firmware/target/arm/rk27xx/i2c-rk27xx.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/firmware/target/arm/rk27xx/i2c-rk27xx.c b/firmware/target/arm/rk27xx/i2c-rk27xx.c index 093fe702f2..f9f20930cc 100644 --- a/firmware/target/arm/rk27xx/i2c-rk27xx.c +++ b/firmware/target/arm/rk27xx/i2c-rk27xx.c | |||
| @@ -131,13 +131,14 @@ void i2c_init(void) | |||
| 131 | 131 | ||
| 132 | /* set I2C divider to stay within allowed SCL freq limit | 132 | /* set I2C divider to stay within allowed SCL freq limit |
| 133 | * APBfreq = 50Mhz | 133 | * APBfreq = 50Mhz |
| 134 | * SCLfreq = (APBfreq/5*(I2CCDVR[5:3] + 1) * 2^((I2CCDVR[2:0] + 1)) | 134 | * I2C_div = (I2CCDVR[5:3] + 1) * 2^((I2CCDVR[2:0] + 1)) |
| 135 | */ | 135 | * SCLfreq = APBfreq/(5*I2C_div) |
| 136 | 136 | * | |
| 137 | /* we are driving this slightly above specs | 137 | * (5<<3) | (1<<0) 416.7 KHz (above spec) |
| 138 | * (6<<3) | (1<<0) 416kHz | 138 | * (6<<3) | (1<<0) 357.1 kHz |
| 139 | * (7<<3) | (1<<0) 357kHz | 139 | * (7<<3) | (1<<0) 312.4 kHz |
| 140 | * (6<<3) | (2<<0) 208kHz | 140 | * (6<<3) | (2<<0) 178.6 kHz |
| 141 | * (7<<3) | (2<<0) 156.3 kHz | ||
| 141 | */ | 142 | */ |
| 142 | I2C_OPR = (I2C_OPR & ~(0x3F)) | (6<<3) | (1<<0); | 143 | I2C_OPR = (I2C_OPR & ~(0x3F)) | (6<<3) | (1<<0); |
| 143 | 144 | ||